/* ============================================
   闫宝龙官方网站 · 精致现代化设计
   www.yanbaolong.cn
   AI/SEO双友好 · GEO优化专家形象
   ============================================ */

/* ---------- CSS Reset & Variables ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* 主色调：科技蓝 + 深空黑 */
    --color-primary: #0066FF;
    --color-primary-dark: #0052CC;
    --color-primary-light: #3385FF;
    --color-primary-bg: #E8F1FF;
    --color-accent: #00D4FF;

    /* 中性色 */
    --color-black: #0A0E27;
    --color-text: #1A1F36;
    --color-text-2: #4A5072;
    --color-text-3: #8B92B0;
    --color-border: #E5E8F0;
    --color-bg: #FFFFFF;
    --color-bg-2: #F8FAFC;
    --color-bg-3: #F0F3F9;

    /* 渐变 */
    --gradient-hero: linear-gradient(135deg, #0A0E27 0%, #1A2353 50%, #0A0E27 100%);
    --gradient-primary: linear-gradient(135deg, #0066FF 0%, #00D4FF 100%);
    --gradient-card: linear-gradient(135deg, rgba(0, 102, 255, 0.05) 0%, rgba(0, 212, 255, 0.05) 100%);

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(10, 14, 39, 0.04);
    --shadow-md: 0 8px 24px rgba(10, 14, 39, 0.08);
    --shadow-lg: 0 16px 48px rgba(10, 14, 39, 0.12);
    --shadow-xl: 0 24px 64px rgba(10, 14, 39, 0.16);

    /* 间距 - 8px基准网格，紧致化 */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 20px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 72px;
    --space-3xl: 104px;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 999px;

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei',
        'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'JetBrains Mono', Menlo, Monaco, Consolas, monospace;

    /* 容器 */
    --container-max: 1280px;
    --header-h: 72px;

    /* 过渡 */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern", "liga", "calt";
}

/* ===== 精致化：选区色 ===== */
::selection {
    background: rgba(0, 102, 255, 0.2);
    color: var(--color-text);
}

::-moz-selection {
    background: rgba(0, 102, 255, 0.2);
    color: var(--color-text);
}

/* ===== 精致化：滚动条 ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.18);
    border-radius: 9999px;
    border: 2px solid transparent;
    background-clip: padding-box;
    transition: background 200ms ease;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.32);
    background-clip: padding-box;
}

* {
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.18) transparent;
}

/* ===== 精致化：键盘焦点环 ===== */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: 6px;
}

button:focus-visible,
a:focus-visible {
    outline-offset: 4px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* ---------- Layout ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-2xl) 0;
    position: relative;
}

.section-sm {
    padding: var(--space-xl) 0;
}

.section-tight {
    padding: var(--space-xl) 0;
}

.section-dark {
    background: var(--color-black);
    color: #fff;
}

.section-bg {
    background: var(--color-bg-2);
}

/* section 之间的渐变过渡带 */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-border) 50%, transparent 100%);
    margin: 0;
    border: 0;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2.25rem, 4.5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
}

h3 {
    font-size: clamp(1.375rem, 2.5vw, 1.75rem);
}

h4 {
    font-size: 1.125rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    margin-bottom: var(--space-sm);
    padding: 6px 14px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.08) 0%, rgba(0, 212, 255, 0.06) 100%);
    border: 1px solid rgba(0, 102, 255, 0.15);
    border-radius: 9999px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.eyebrow::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.18);
}

.section-title {
    margin-bottom: var(--space-md);
    letter-spacing: -0.03em;
    font-weight: 800;
    line-height: 1.2;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
    margin: var(--space-md) auto 0;
    opacity: 0.7;
}

.section-header-left .section-title::after {
    margin-left: 0;
    margin-right: 0;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--color-text-2);
    max-width: 720px;
    line-height: 1.7;
    letter-spacing: 0.005em;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.section-header .section-subtitle {
    margin: 0 auto;
}

.section-header-left {
    text-align: left;
    margin-bottom: var(--space-xl);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    white-space: nowrap;
    cursor: pointer;
    border: 1px solid transparent;
    line-height: 1;
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}

/* ===== 精致化：按钮光泽扫过 ===== */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(110deg, transparent 25%, rgba(255, 255, 255, 0.25) 50%, transparent 75%);
    transition: left 0.6s ease;
    pointer-events: none;
}

.btn:hover::before {
    left: 150%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 8px 20px rgba(0, 102, 255, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 32px rgba(0, 102, 255, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.28);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.6);
    color: var(--color-text);
    border-color: var(--color-border);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(0, 102, 255, 0.1);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    backdrop-filter: blur(12px);
    border-color: rgba(255, 255, 255, 0.18);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

.btn-light {
    background: #fff;
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

.btn-light:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ---------- Header / Navigation ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: all var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.0625rem;
    color: var(--color-text);
    letter-spacing: -0.01em;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}
.brand:hover { opacity: 0.85; }

.brand-text-only {
    gap: 0;
    padding: 6px 0;
}

.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gradient-primary);
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 800;
    font-size: 0.875rem;
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.25);
}

/* ----- 纯文字 logo：放大 + 鲜亮突出 ----- */
.brand-name {
    display: flex;
    flex-direction: column;
    line-height: 1.05;
    gap: 3px;
}

.brand-name span:first-child {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 8px rgba(0, 102, 255, 0.08);
}

.brand-name span:first-child sup {
    font-size: 0.55em;
    -webkit-text-fill-color: var(--color-primary);
    opacity: 0.65;
    margin-left: 1px;
    font-weight: 700;
}

.brand-name span:last-child {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.22em;
    text-transform: uppercase;
    opacity: 0.85;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    position: relative;
    display: block;
    padding: 10px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-2);
    border-radius: var(--radius-full);
    transition: color var(--transition-fast), background var(--transition-fast);
    letter-spacing: 0.01em;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 16px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transition: transform 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(0, 102, 255, 0.06);
}

.nav-link:hover::before,
.nav-link.active::before {
    transform: translateX(-50%) scaleX(1);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
}

.nav-phone svg {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--color-bg-2);
    color: var(--color-text);
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    margin: 4px auto;
    transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero ---------- */
.hero {
    padding-top: calc(var(--header-h) + var(--space-xl));
    padding-bottom: var(--space-xl);
    background: var(--gradient-hero);
    color: #fff;
    position: relative;
    overflow: hidden;
    min-height: 88vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 60%;
    height: 140%;
    background:
        radial-gradient(circle at 30% 30%, rgba(0, 102, 255, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(0, 212, 255, 0.18) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.25fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    margin-bottom: var(--space-sm);
}

.hero-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 8px var(--color-accent);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.hero h1 {
    color: #fff;
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    line-height: 1.1;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.03em;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, #00D4FF 0%, #66E0FF 50%, #00D4FF 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    animation: gradientShift 6s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-sub {
    font-size: 1.0625rem;
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.7;
    max-width: 560px;
    margin-bottom: var(--space-md);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: var(--space-md);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: relative;
}

.hero-meta-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: calc(var(--space-lg) / -2);
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: rgba(255, 255, 255, 0.15);
}

.hero-meta-num {
    font-size: 1.875rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #00D4FF 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.hero-meta-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 0.02em;
}

.hero-visual {
    position: relative;
    aspect-ratio: 1 / 1.05;
}

.hero-portrait {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 18%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 2;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.hero-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-text);
    backdrop-filter: blur(12px);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.8125rem;
    z-index: 3;
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.hero-card-1 {
    top: 6%;
    left: -8%;
    animation: floatA 6s ease-in-out infinite;
}

.hero-card-2 {
    bottom: 14%;
    right: -4%;
    animation: floatB 6s ease-in-out infinite;
}

.hero-card-3 {
    top: 48%;
    right: -10%;
    padding: 10px 14px;
    background: var(--gradient-primary);
    color: #fff;
    border: none;
    animation: floatA 7s ease-in-out infinite;
}

.hero-card-title {
    font-weight: 700;
    margin-bottom: 2px;
    font-size: 0.875rem;
}

.hero-card-meta {
    color: var(--color-text-3);
    font-size: 0.75rem;
}

.hero-card-3 .hero-card-meta {
    color: rgba(255, 255, 255, 0.85);
}

@keyframes floatA {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes floatB {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

/* ---------- AI Platforms Strip ---------- */
.ai-strip {
    background: var(--color-bg-2);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.ai-strip-title {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-3);
    font-weight: 500;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
}

.ai-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px var(--space-sm);
    justify-content: center;
    align-items: center;
}

.ai-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-2);
    transition: all var(--transition-base);
}

.ai-chip:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.ai-chip-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 6px rgba(0, 102, 255, 0.4);
}

/* ---------- Cards ---------- */
.card {
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

/* 卡片 hover 光泽扫过 */
.card::after,
.service-card::after,
.case-card::after,
.process-step::after,
.influence-card::after,
.insight-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.5) 50%, transparent 100%);
    transition: left 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    z-index: 1;
}

.card:hover,
.service-card:hover,
.case-card:hover,
.process-step:hover,
.influence-card:hover,
.insight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.card:hover::after,
.service-card:hover::after,
.case-card:hover::after,
.process-step:hover::after,
.influence-card:hover::after,
.insight-card:hover::after {
    left: 150%;
}

.card > * {
    position: relative;
    z-index: 2;
}

.card-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    box-shadow: 0 6px 16px rgba(0, 102, 255, 0.25);
}

.card-title {
    font-size: 1.125rem;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.card-text {
    color: var(--color-text-2);
    line-height: 1.65;
    font-size: 0.9rem;
}

.card-list {
    margin-top: var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.card-list li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-2);
    line-height: 1.5;
}

.card-list li::before {
    content: '';
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-primary);
    margin-top: 7px;
    flex-shrink: 0;
}

/* ---------- Grid Systems ---------- */
.grid {
    display: grid;
    gap: var(--space-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

/* 紧致化 grid gap - 统一为 20px */
.grid-2,
.grid-3,
.grid-4,
.feature-grid,
.services-grid,
.cases-grid,
.process-grid,
.influence-grid,
.insights-grid,
.timeline {
    gap: var(--space-md);
}

/* ---------- About ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-xl);
    align-items: center;
}

.about-photo {
    position: relative;
    aspect-ratio: 4 / 5;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.about-photo::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, transparent 60%);
    z-index: 1;
    pointer-events: none;
}

.about-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 2;
}

.about-photo-badge {
    position: absolute;
    bottom: var(--space-md);
    left: var(--space-md);
    right: var(--space-md);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    z-index: 3;
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.about-photo-badge-title {
    font-weight: 700;
    font-size: 0.9375rem;
    margin-bottom: 2px;
}

.about-photo-badge-meta {
    color: var(--color-text-3);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.about-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.about-text {
    color: var(--color-text-2);
    line-height: 1.75;
    font-size: 0.9375rem;
}

.about-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.about-tag {
    padding: 5px 12px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.about-tag:hover {
    background: var(--color-primary);
    color: #fff;
    transform: translateY(-2px);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.about-highlight-num {
    font-size: 1.625rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.about-highlight-label {
    font-size: 0.75rem;
    color: var(--color-text-3);
    line-height: 1.4;
}

/* ---------- YBL Model ---------- */
.ybl-model {
    background: var(--color-bg-2);
}

.ybl-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-sm);
    position: relative;
}

.ybl-step {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    position: relative;
    transition: all var(--transition-base);
    overflow: hidden;
}

.ybl-step::after {
    content: '→';
    position: absolute;
    right: -16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-primary);
    font-size: 1.25rem;
    font-weight: 700;
    z-index: 3;
}

.ybl-step:last-child::after {
    display: none;
}

.ybl-step:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 102, 255, 0.1), 0 4px 8px rgba(15, 23, 42, 0.04);
}

.ybl-step::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.ybl-step:hover::before {
    transform: scaleX(1);
}

.ybl-step-num {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: var(--space-xs);
}

.ybl-step-tag {
    font-size: 0.6875rem;
    color: var(--color-text-3);
    font-weight: 700;
    letter-spacing: 0.1em;
}

.ybl-step-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
    font-size: 0.875rem;
}

.ybl-step-title {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.ybl-step-text {
    font-size: 0.75rem;
    color: var(--color-text-3);
    line-height: 1.5;
    margin-bottom: 8px;
}

.ybl-step-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ybl-step-list li {
    font-size: 0.75rem;
    color: var(--color-text-2);
    padding: 3px 0;
    padding-left: 14px;
    position: relative;
    line-height: 1.4;
}

.ybl-step-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 6px;
    height: 1px;
    background: var(--color-primary);
}

/* ---------- Solutions (三大体系) ---------- */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.solution-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.03) 0%, rgba(0, 212, 255, 0.03) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.solution-card:hover::before {
    opacity: 1;
}

.solution-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 500ms cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 3;
}

.solution-card:hover::after {
    transform: scaleX(1);
}

.solution-card > * {
    position: relative;
    z-index: 2;
}

.solution-num {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.solution-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    line-height: 1.35;
}

.solution-features {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: var(--space-sm);
}

.solution-feature {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-2);
    padding: 3px 10px;
    background: var(--color-bg-2);
    border-radius: var(--radius-full);
}

.solution-meta {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.solution-meta-row {
    font-size: 0.8125rem;
    line-height: 1.5;
}

.solution-meta-row strong {
    color: var(--color-text);
    font-weight: 700;
    display: block;
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-3);
    margin-bottom: 2px;
}

.solution-meta-row span {
    color: var(--color-text-2);
}

/* ---------- Timeline (Methodology) ---------- */
.methodology {
    background: var(--color-black);
    color: #fff;
}

.methodology .section-title,
.methodology .section-subtitle {
    color: #fff;
}

.methodology .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

.methodology .eyebrow {
    color: var(--color-accent);
}

.timeline {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-md);
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(0, 212, 255, 0.4) 50%, transparent 100%);
    z-index: 0;
}

.timeline-item {
    position: relative;
    z-index: 1;
}

.timeline-dot {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 800;
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    box-shadow: 0 0 0 8px var(--color-black), 0 0 0 9px rgba(0, 102, 255, 0.3);
}

.timeline-year {
    font-size: 0.75rem;
    color: var(--color-accent);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.timeline-title {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #fff;
    line-height: 1.4;
}

.timeline-text {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.55;
}

/* ---------- Services ---------- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.service-card {
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
    z-index: 2;
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-primary-bg);
    color: var(--color-primary);
    display: grid;
    place-items: center;
    margin-bottom: var(--space-sm);
}

.service-icon svg {
    width: 24px;
    height: 24px;
}

.service-title {
    font-size: 1.125rem;
    margin-bottom: 6px;
    font-weight: 700;
}

.service-tag {
    display: inline-block;
    font-size: 0.6875rem;
    color: var(--color-text-3);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-xs);
}

.service-desc {
    color: var(--color-text-2);
    line-height: 1.65;
    font-size: 0.875rem;
    margin-bottom: var(--space-sm);
}

.service-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: var(--space-sm);
}

.service-list-chip {
    padding: 4px 10px;
    background: var(--color-bg-2);
    color: var(--color-text-2);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.service-card:hover .service-list-chip {
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

.service-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.8125rem;
    margin-top: var(--space-xs);
}

.service-cta:hover {
    gap: 10px;
}

.service-cta svg {
    width: 12px;
    height: 12px;
}

/* ---------- Process ---------- */
.process-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-md);
}

.process-step {
    text-align: center;
    padding: var(--space-md);
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.process-step:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.process-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 700;
    margin-bottom: var(--space-xs);
    font-size: 0.9rem;
}

.process-step-title {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.process-step-text {
    font-size: 0.8125rem;
    color: var(--color-text-3);
    line-height: 1.5;
}

/* ---------- Cases ---------- */
.cases-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.case-tab {
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: #fff;
    color: var(--color-text-2);
    font-size: 0.8125rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.case-tab:hover,
.case-tab.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.case-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.case-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.case-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 12px 32px rgba(0, 102, 255, 0.12), 0 4px 12px rgba(15, 23, 42, 0.06);
    transform: translateY(-4px);
}

.case-card:hover::before {
    transform: scaleX(1);
}

.case-industry {
    display: inline-block;
    padding: 3px 10px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.6875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
}

.case-title {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    font-weight: 700;
    line-height: 1.4;
}

.case-section {
    margin-bottom: var(--space-xs);
}

.case-label {
    font-size: 0.6875rem;
    color: var(--color-text-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 2px;
}

.case-text {
    font-size: 0.8125rem;
    color: var(--color-text-2);
    line-height: 1.55;
}

.case-results {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px dashed var(--color-border);
}

.case-result {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-bg);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
}

/* ---------- Influence ---------- */
.influence-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-md);
}

.influence-card {
    text-align: center;
    padding: var(--space-md);
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.influence-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 102, 255, 0.1);
}

.influence-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.influence-card:hover::after {
    transform: scaleX(1);
}

.influence-icon {
    width: 44px;
    height: 44px;
    margin: 0 auto var(--space-xs);
    border-radius: var(--radius-md);
    background: var(--color-primary-bg);
    color: var(--color-primary);
    display: grid;
    place-items: center;
}

.influence-icon svg {
    width: 22px;
    height: 22px;
}

.influence-title {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.influence-text {
    font-size: 0.75rem;
    color: var(--color-text-3);
    line-height: 1.5;
}

/* ---------- Credentials · 权威资质 ---------- */
.section-credentials {
    background: linear-gradient(180deg, #0a0e1a 0%, #0d1426 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.section-credentials::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 15% 20%, rgba(0, 102, 255, 0.18) 0%, transparent 45%),
        radial-gradient(circle at 85% 80%, rgba(255, 107, 53, 0.14) 0%, transparent 45%);
    pointer-events: none;
}

.section-credentials .section-header {
    position: relative;
    z-index: 1;
}

.section-credentials .eyebrow {
    color: #ff8c5a;
}

.section-credentials .section-title {
    color: #fff;
}

.section-credentials .section-subtitle {
    color: rgba(255, 255, 255, 0.65);
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-md);
    position: relative;
    z-index: 1;
}

.credential-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: #fff;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.credential-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.08) 50%, transparent 70%);
    left: -100%;
    transition: left 0.6s ease;
    pointer-events: none;
}

.credential-card:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(0, 102, 255, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0, 102, 255, 0.18);
}

.credential-card:hover::after {
    left: 150%;
}

.credential-icon {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    display: grid;
    place-items: center;
    color: #fff;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(247, 147, 30, 0.3);
}

.credential-icon svg {
    width: 20px;
    height: 20px;
}

.credential-body {
    flex: 1;
    min-width: 0;
}

.credential-title {
    font-size: 0.875rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 4px;
    color: #fff;
}

.credential-title sup {
    font-size: 0.6em;
    color: #ff8c5a;
    margin-left: 1px;
}

.credential-id {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 4px;
    font-weight: 500;
    word-break: break-all;
}

.credential-desc {
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.5;
}

.credential-link {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 18px;
    height: 18px;
    color: rgba(255, 255, 255, 0.4);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.credential-link svg {
    width: 100%;
    height: 100%;
}

.credential-card:hover .credential-link {
    color: #ff8c5a;
    transform: translate(2px, -2px);
}

@media (max-width: 1200px) {
    .credentials-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .credentials-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    .credential-card {
        padding: var(--space-sm);
    }
    .credential-icon {
        width: 32px;
        height: 32px;
    }
    .credential-icon svg {
        width: 16px;
        height: 16px;
    }
    .credential-title {
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .credentials-grid {
        grid-template-columns: 1fr;
    }
}

/* ---------- Insights ---------- */
.insights-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: var(--space-md);
}

.insight-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 0;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    position: relative;
    overflow: hidden;
}

.insight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
}

.insight-card:hover::before {
    transform: scaleX(1);
}

.insight-card-link {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-lg);
    text-decoration: none;
    color: inherit;
    height: 100%;
}

.insight-card-link:hover { text-decoration: none; color: inherit; }

.insight-readmore {
    margin-left: auto;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.8125rem;
    transition: transform var(--transition-fast);
}

.insight-card-link:hover .insight-readmore { transform: translateX(4px); }

.insight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.insight-card.featured {
    grid-row: span 2;
    background: var(--gradient-hero);
    color: #fff;
    border-color: transparent;
    position: relative;
}

.insight-card.featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 20% 80%, rgba(0, 102, 255, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

.insight-card.featured > * {
    position: relative;
    z-index: 2;
}

.insight-card.featured .insight-title,
.insight-card.featured .insight-excerpt {
    color: #fff;
}

.insight-card.featured .insight-meta {
    color: rgba(255, 255, 255, 0.7);
}

.insight-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 10px;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.6875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    align-self: flex-start;
    letter-spacing: 0.05em;
}

.insight-card.featured .insight-tag {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    backdrop-filter: blur(8px);
}

.insight-title {
    font-size: 1.0625rem;
    line-height: 1.4;
    margin: 0;
    font-weight: 700;
}

.insight-card.featured .insight-title {
    font-size: 1.375rem;
}

.insight-excerpt {
    font-size: 0.875rem;
    color: var(--color-text-2);
    line-height: 1.65;
    flex: 1;
}

.insight-card.featured .insight-excerpt {
    font-size: 0.9375rem;
}

.insight-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--color-text-3);
    padding-top: var(--space-xs);
    border-top: 1px solid var(--color-border);
}

.insight-card.featured .insight-meta {
    border-top-color: rgba(255, 255, 255, 0.15);
}

/* ---------- FAQ ---------- */
.faq-list {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.faq-item {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
    list-style: none;
}

.faq-item::-webkit-details-marker { display: none; }
.faq-item > summary { list-style: none; cursor: pointer; }
.faq-item > summary::marker { display: none; }

.faq-item[open] {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: var(--space-md) var(--space-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    transition: color var(--transition-fast);
    cursor: pointer;
    list-style: none;
}

.faq-question:hover { color: var(--color-primary); }

.faq-question::after {
    content: '';
    width: 12px;
    height: 12px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234A5072' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-item[open] .faq-question {
    color: var(--color-primary);
}

.faq-item[open] .faq-question::after {
    transform: rotate(180deg);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230066FF' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
}

.faq-question .faq-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 12px;
    flex-shrink: 0;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.faq-item[open] .faq-question .faq-num {
    background: var(--gradient-primary);
    color: #fff;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item[open] > .faq-answer {
    max-height: 1200px;
}

.faq-answer-inner {
    padding: 0 var(--space-lg) var(--space-md);
    color: var(--color-text-2);
    line-height: 1.75;
    font-size: 0.875rem;
}

/* ---------- Contact ---------- */
.contact-card {
    background: var(--gradient-hero);
    color: #fff;
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.15) 0%, transparent 60%);
    pointer-events: none;
}

.contact-info {
    position: relative;
    z-index: 1;
}

.contact-info h3 {
    color: #fff;
    margin-bottom: var(--space-sm);
}

.contact-info p {
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: var(--space-md);
    line-height: 1.65;
    font-size: 0.9375rem;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 12px var(--space-md);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(8px);
    transition: all var(--transition-base);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(0, 212, 255, 0.4);
    transform: translateX(4px);
}

.contact-item-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: grid;
    place-items: center;
    flex-shrink: 0;
}

.contact-item-icon svg {
    width: 18px;
    height: 18px;
    color: #fff;
}

.contact-item-body {
    flex: 1;
}

.contact-item-label {
    font-size: 0.6875rem;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.contact-item-value {
    font-size: 0.9375rem;
    font-weight: 700;
    color: #fff;
}

.contact-item-arrow {
    color: rgba(255, 255, 255, 0.5);
}

.contact-qr {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    text-align: center;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(12px);
}

.contact-qr-img {
    width: 180px;
    height: 180px;
    margin: 0 auto var(--space-sm);
    background: #fff;
    border-radius: var(--radius-md);
    padding: 10px;
    display: grid;
    place-items: center;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.contact-qr-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.contact-qr-title {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-qr-text {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}

/* ---------- Footer ---------- */
.site-footer {
    background: linear-gradient(180deg, #0a0e27 0%, #050816 100%);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-xl) 0 var(--space-md);
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(0, 102, 255, 0.6) 50%, transparent 100%);
}

.site-footer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 80px;
    background: radial-gradient(ellipse at center top, rgba(0, 102, 255, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    position: relative;
    z-index: 1;
}

.footer-brand .brand {
    color: #fff;
    margin-bottom: var(--space-sm);
}

.footer-text {
    font-size: 0.8125rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.55);
    max-width: 320px;
    letter-spacing: 0.01em;
}

.footer-heading {
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    position: relative;
    padding-bottom: 8px;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 20px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.footer-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-list a {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.55);
    transition: color var(--transition-fast), transform var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.footer-list a:hover {
    color: #66e0ff;
    transform: translateX(3px);
}

.footer-list a::before {
    content: '';
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width 250ms ease;
}

.footer-list a:hover::before {
    width: 12px;
}

.footer-bottom {
    padding-top: var(--space-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
    position: relative;
    z-index: 1;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: #66e0ff;
}

/* ---------- Animations ---------- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 无 JS 时的回退：所有 reveal 元素正常显示，避免空白 */
.no-js .reveal,
.reveal.is-ready {
    opacity: 1 !important;
    transform: none !important;
}

@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
    }
    .hero-visual {
        max-width: 480px;
        margin: 0 auto;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .services-grid,
    .cases-grid,
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .timeline {
        grid-template-columns: repeat(6, 1fr);
        overflow-x: auto;
        padding-bottom: var(--space-sm);
        margin-top: var(--space-sm);
    }
    .timeline-item {
        min-width: 160px;
    }
    .timeline::before {
        display: none;
    }
    .influence-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .process-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .ybl-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .ybl-step:nth-child(3)::after {
        display: none;
    }
    .insights-grid {
        grid-template-columns: 1fr 1fr;
    }
    .insight-card.featured {
        grid-row: auto;
        grid-column: span 2;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .contact-card {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --space-2xl: 56px;
        --space-xl: 40px;
        --space-lg: 24px;
    }
    .nav-list {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background: #fff;
        padding: var(--space-sm);
        gap: 4px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-base);
        box-shadow: var(--shadow-md);
    }
    .nav-list.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .nav-link {
        padding: 12px 16px;
    }
    .menu-toggle {
        display: block;
    }
    .nav-actions .nav-phone {
        display: none;
    }
    .hero {
        min-height: auto;
    }
    .hero-meta {
        gap: var(--space-md);
    }
    .hero-meta-num {
        font-size: 1.5rem;
    }
    .hero-card-1,
    .hero-card-3 {
        display: none;
    }
    .hero-card-2 {
        bottom: 8%;
        right: 4%;
    }
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .services-grid,
    .cases-grid,
    .solutions-grid,
    .insights-grid {
        grid-template-columns: 1fr;
    }
    .insight-card.featured {
        grid-column: auto;
    }
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .influence-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .ybl-grid {
        grid-template-columns: 1fr;
    }
    .ybl-step::after {
        display: none !important;
    }
    .timeline {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    .timeline-item {
        display: flex;
        gap: var(--space-sm);
        align-items: flex-start;
        padding: var(--space-sm);
        background: rgba(255, 255, 255, 0.04);
        border-radius: var(--radius-md);
        min-width: 0;
    }
    .timeline-dot {
        margin-bottom: 0;
        flex-shrink: 0;
        width: 48px;
        height: 48px;
        box-shadow: none;
    }
    .timeline-body {
        flex: 1;
    }
    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .ai-list {
        gap: 6px;
    }
    .ai-chip {
        font-size: 0.75rem;
        padding: 6px 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .btn {
        padding: 12px 20px;
        font-size: 0.875rem;
    }
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    .hero-cta .btn {
        justify-content: center;
    }
}

/* ---------- Print / Accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ---------- Skip Link ---------- */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: 8px 16px;
    z-index: 200;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}