/* ============================================
   AI赋能各行各业 — 产品介绍网站样式
   设计风格：科技感 · 赋能感
   ============================================ */

/* --- CSS Variables --- */
:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --accent: #06b6d4;
    --accent-light: #22d3ee;
    --bg-dark: #0a0a1a;
    --bg-card: #111128;
    --bg-card-hover: #1a1a3e;
    --bg-surface: #0f0f2d;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(99, 102, 241, 0.15);
    --border-hover: rgba(99, 102, 241, 0.4);
    --gradient-primary: linear-gradient(135deg, #6366f1, #06b6d4);
    --gradient-hero: linear-gradient(180deg, #0a0a1a 0%, #0f0f2d 50%, #0a0a1a 100%);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-en: 'Inter', var(--font-cn);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-cn);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 26, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 36px;
    align-items: center;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition);
    border-radius: 1px;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(99, 102, 241, 0.5);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--gradient-hero);
}

#heroCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 24px 80px;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--primary-light);
    margin-bottom: 32px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.title-line {
    display: block;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Keyword Highlight */
.kw {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.section-title .kw {
    font-size: inherit;
}

.hero-desc .kw {
    font-size: 1.15em;
    letter-spacing: 0.5px;
}

.hero-desc {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-pain-list {
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 8px 24px;
    justify-content: center;
    margin-bottom: 16px;
}

.pain-item {
    font-size: 0.95rem;
    color: var(--text-secondary);
    white-space: nowrap;
    text-align: left;
}

.pain-item em {
    font-style: normal;
    font-weight: 700;
    font-size: 0.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-trust-line + .hero-stats {
    margin-top: 40px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-cn);
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border-hover);
}

.btn-outline:hover {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 40px;
    font-size: 1.05rem;
}

/* --- Hero Stats --- */
.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.stat-item {
    text-align: center;
    line-height: 1;
}

.stat-number {
    display: inline;
    font-family: var(--font-en);
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-suffix {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
    line-height: 1.4;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border-color);
}

/* --- Scroll Hint --- */
.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.75rem;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.scroll-arrow {
    width: 20px;
    height: 30px;
    border: 2px solid var(--text-muted);
    border-radius: 10px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    width: 4px;
    height: 8px;
    background: var(--primary-light);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 0.3; }
}

/* --- Section Common --- */
.section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- About Grid --- */
.about-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition);
}

.about-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

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

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    color: var(--primary-light);
    margin-bottom: 20px;
}

.about-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.about-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Tier Cards & Dimension Cards */
.about-grid.three-cols {
    grid-template-columns: repeat(3, 1fr);
}

.about-grid.six-dims {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.dim-card {
    padding: 28px 24px;
    text-align: left;
}

.dim-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.dim-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.dim-pain {
    font-size: 0.825rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 14px;
    font-style: italic;
}

.dim-solution {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
}

.dim-solution span {
    font-size: 0.825rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.dim-result {
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
}

/* Stages Section */
.stages {
    background: var(--bg-dark);
}

.stages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.stages-grid.five-steps {
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.stages-grid.six-steps {
    grid-template-columns: repeat(6, 1fr);
    gap: 14px;
}

.stage-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.stage-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.stage-highlight {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.stage-price {
    font-size: 0.7rem;
    font-weight: 800;
    color: #4ade80;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.stage-highlight .stage-price {
    color: #fbbf24;
}

.stage-cta {
    margin-top: auto;
    padding: 10px 20px;
    font-size: 0.85rem;
    text-align: center;
    justify-content: center;
}

.stage-level {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-light);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.stage-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.stage-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.stage-scenes {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.stage-scenes span {
    padding: 3px 10px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.stage-verdict {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 12px;
}

.verdict-good {
    font-size: 0.8rem;
    color: #4ade80;
}

.verdict-limit {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.stage-when {
    font-size: 0.75rem;
    color: var(--text-muted);
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-style: italic;
}

.stage-summary {
    text-align: center;
    padding: 24px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.stage-summary p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.tier-card {
    display: flex;
    flex-direction: column;
}

.tier-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 16px;
    width: fit-content;
}

.tier-card:nth-child(1) .tier-badge {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
}

.tier-card:nth-child(2) .tier-badge {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-light);
}

.tier-card:nth-child(3) .tier-badge {
    background: rgba(34, 197, 94, 0.15);
    color: #4ade80;
}

.card-icon.tier-1 { color: var(--primary-light); }
.card-icon.tier-2 { color: var(--accent-light); }
.card-icon.tier-3 { color: #4ade80; }

.tier-features {
    list-style: none;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tier-features li {
    font-size: 0.825rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}

.tier-features li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-light);
    font-weight: 700;
}

/* --- Cases Section --- */
.cases {
    background: var(--bg-surface);
}

/* Cases Overview Bar */
.cases-overview {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    padding: 32px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    margin-bottom: 48px;
}

.overview-item {
    text-align: center;
}

.overview-number {
    display: block;
    font-family: var(--font-en);
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.overview-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.overview-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.case-filters {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    border: 1px solid var(--border-color);
    border-radius: 100px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.825rem;
    font-family: var(--font-cn);
    cursor: pointer;
    transition: all var(--transition);
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* --- Case Card (v2.0 System-level Design) --- */
.case-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition);
}

.case-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.case-card-top {
    border-left: 4px solid;
    padding: 28px 32px 20px;
}

.case-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.case-card-icon {
    font-size: 2.2rem;
    line-height: 1;
    flex-shrink: 0;
    margin-top: 2px;
}

.case-card-header-text {
    flex: 1;
}

.case-header-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.case-tag {
    padding: 3px 12px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
}

.tier-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-light);
    padding: 3px 10px;
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: 100px;
}

.case-card-header-text h3 {
    font-size: 1.35rem;
    font-weight: 800;
    line-height: 1.35;
    margin-bottom: 4px;
}

.case-client {
    font-size: 0.825rem;
    color: var(--text-muted);
}

.case-card-body {
    padding: 0 32px 28px;
}

.case-section {
    margin-bottom: 16px;
}

.case-section.highlight {
    background: rgba(99, 102, 241, 0.05);
    border: 1px solid rgba(99, 102, 241, 0.12);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-left: -4px;
    margin-right: -4px;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.case-section p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.case-section.highlight p {
    color: var(--text-primary);
}

/* Results Grid */
.case-results-grid {
    display: flex;
    gap: 16px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.result-block {
    flex: 1;
    min-width: 120px;
    text-align: center;
    padding: 16px 12px;
    background: rgba(6, 182, 212, 0.06);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: var(--radius-md);
}

.result-block .result-value {
    display: block;
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1.2;
    margin-bottom: 4px;
}

.result-block .result-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.result-block .result-detail {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Why Not ChatGPT */
.why-not-box {
    background: rgba(251, 191, 36, 0.06);
    border: 1px solid rgba(251, 191, 36, 0.2);
    border-radius: var(--radius-md);
    padding: 14px 18px;
}

.why-not-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: #fbbf24;
    margin-bottom: 6px;
}

.why-not-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-style: italic;
}

/* --- Video Modal --- */
.video-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.video-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 900px;
    aspect-ratio: 16 / 9;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 10;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--primary);
}

.video-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: var(--text-muted);
}

.video-note {
    font-size: 0.8rem;
    opacity: 0.6;
}

/* --- Process Section --- */
.process {
    background: var(--bg-dark);
}

.process-timeline {
    max-width: 700px;
    margin: 0 auto;
    position: relative;
}

.process-timeline::before {
    content: '';
    position: absolute;
    left: 40px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    opacity: 0.3;
}

.process-step {
    display: flex;
    gap: 32px;
    align-items: flex-start;
    margin-bottom: 48px;
    position: relative;
}

.process-step:last-child {
    margin-bottom: 0;
}

.step-number {
    flex-shrink: 0;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 2px solid var(--border-hover);
    border-radius: 50%;
    font-family: var(--font-en);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-light);
    position: relative;
    z-index: 2;
}

.step-content {
    padding-top: 16px;
}

.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* --- Testimonials --- */
.testimonials {
    background: var(--bg-surface);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
}

.testimonial-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.testimonial-stars {
    color: #fbbf24;
    font-size: 1.1rem;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.testimonial-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    color: white;
    flex-shrink: 0;
}

.testimonial-author strong {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
}

.testimonial-author span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- CTA Section --- */
.cta-section {
    background: var(--bg-dark);
}

.cta-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 56px 48px;
    text-align: center;
    overflow: hidden;
}

.cta-bg-pattern {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.cta-card h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    margin-bottom: 16px;
    position: relative;
}

.cta-card > p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 28px;
    position: relative;
    line-height: 1.7;
}

.cta-form {
    max-width: 640px;
    margin: 0 auto;
    position: relative;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    text-align: left;
}

.form-group.full-width {
    margin-bottom: 24px;
}

.cta-form input,
.cta-form select,
.cta-form textarea {
    width: 100%;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-cn);
    transition: all var(--transition);
    outline: none;
}

.cta-form input::placeholder,
.cta-form textarea::placeholder {
    color: var(--text-muted);
}

.cta-form input:focus,
.cta-form select:focus,
.cta-form textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.cta-form select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

.cta-form select option {
    background: var(--bg-card);
    color: var(--text-primary);
}

.cta-form textarea {
    resize: vertical;
    min-height: 100px;
}

/* --- Hero Trust Line --- */
.hero-trust-line {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out 0.35s both;
    letter-spacing: 0.5px;
}

/* --- Team & Tech Tags (inside About section) --- */
.about-team {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.team-row {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.team-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-right: 6px;
    white-space: nowrap;
}

.trust-tag {
    padding: 4px 14px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--primary-light);
    white-space: nowrap;
}

.trust-tag.tech {
    background: rgba(6, 182, 212, 0.08);
    border-color: rgba(6, 182, 212, 0.2);
    color: var(--accent-light);
    font-family: var(--font-en);
    font-size: 0.7rem;
}

/* --- Mid CTA Banner --- */
.mid-cta {
    padding: 0 0 0 0;
    margin: -40px 0 0 0;
}

.mid-cta .container {
    padding: 0 24px;
}

.mid-cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(6, 182, 212, 0.12));
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-lg);
    padding: 28px 36px;
}

.mid-cta-text {
    font-size: 1rem;
    color: var(--text-secondary);
}

.mid-cta-text strong {
    color: var(--text-primary);
}

/* --- Simplified CTA Form --- */
.cta-urgency {
    font-size: 0.95rem;
    color: #fbbf24;
    margin-bottom: 16px;
    position: relative;
    font-weight: 600;
}

.cta-form-simple .form-row-inline {
    display: flex;
    gap: 12px;
    max-width: 600px;
    margin: 0 auto;
}

.cta-form-simple input,
.cta-form-simple select {
    flex: 1;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-cn);
    outline: none;
    transition: all var(--transition);
}

.cta-form-simple input::placeholder {
    color: var(--text-muted);
}

.cta-form-simple input:focus,
.cta-form-simple select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.cta-form-simple select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%2364748b' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    min-width: 120px;
}

.cta-form-simple select option {
    background: var(--bg-card);
}

.cta-form-simple .btn {
    flex-shrink: 0;
    padding: 16px 32px;
    white-space: nowrap;
}

/* WeChat Contact Area */
.cta-wechat {
    margin-top: 30px;
    position: relative;
    color: var(--text-muted);
    font-size: 0.85rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.wechat-qr-image {
    width: min(100%, 360px);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: white;
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
}

.wechat-caption {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* --- Floating CTA --- */
.floating-cta {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
    pointer-events: none;
}

.floating-cta.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.float-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 22px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 700;
    font-family: var(--font-cn);
    text-decoration: none;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.float-btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.float-btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.5);
}

/* --- Footer --- */
.footer {
    background: linear-gradient(180deg, var(--bg-surface) 0%, #090914 100%);
    border-top: 1px solid var(--border-color);
    padding: 72px 0 28px;
}

.footer-main {
    display: grid;
    grid-template-columns: minmax(280px, 360px) 1fr;
    gap: 72px;
    align-items: start;
    margin-bottom: 52px;
}

.footer-brand-panel {
    max-width: 360px;
}

.footer-logo {
    width: fit-content;
}

.footer-slogan {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 16px;
    line-height: 1.7;
}

.footer-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 24px;
}

.footer-primary-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 700;
}

.footer-primary-link {
    padding: 10px 20px;
    color: white;
    background: var(--gradient-primary);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.22);
}

.footer-primary-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.34);
}

.footer-trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 22px;
}

.footer-trust-tags span {
    padding: 5px 11px;
    border: 1px solid rgba(6, 182, 212, 0.16);
    border-radius: 100px;
    background: rgba(6, 182, 212, 0.06);
    color: var(--text-secondary);
    font-size: 0.72rem;
    white-space: nowrap;
}

.footer-nav-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 34px;
}

.footer-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 18px;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a,
.contact-list li {
    font-size: 0.84rem;
    color: var(--text-secondary);
    transition: color var(--transition);
    line-height: 1.55;
}

.footer-links a:hover {
    color: var(--primary-light);
}

.footer-contact .contact-list li {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.footer-contact .contact-list span {
    color: var(--text-muted);
    font-size: 0.72rem;
}

.footer-wechat-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.84rem;
}

.footer-wechat-card:hover {
    color: var(--primary-light);
}

.footer-wechat-image {
    width: 118px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: white;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p,
.footer-legal {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-legal {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 16px;
}

.footer-legal a:hover {
    color: var(--primary-light);
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- AOS-style animations (JS driven) --- */
[data-aos] {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-aos="fade-left"] {
    transform: translateX(40px);
}

[data-aos="fade-right"] {
    transform: translateX(-40px);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translate(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid.three-cols {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-grid.six-dims {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .stages-grid.five-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .stages-grid.six-steps {
        grid-template-columns: repeat(3, 1fr);
    }

    .case-pain-solution {
        grid-template-columns: 1fr;
    }

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

    .footer-main {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-brand-panel {
        max-width: none;
    }

    .footer-nav-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-links, .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    [data-aos="fade-left"],
    [data-aos="fade-right"] {
        transform: translateY(40px);
    }

    /* Mobile menu */
    .navbar.nav-open .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 10, 26, 0.98);
        backdrop-filter: blur(20px);
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }

    .navbar.nav-open .nav-cta {
        display: inline-flex;
        position: absolute;
        top: calc(100% + 140px);
        left: 24px;
    }

    .hero-content {
        padding: 100px 20px 60px;
    }

    .hero-pain-list {
        grid-template-columns: 1fr 1fr;
        gap: 6px 16px;
    }

    .pain-item {
        font-size: 0.8rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .stat-divider {
        width: 48px;
        height: 1px;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-grid.three-cols {
        grid-template-columns: 1fr;
    }

    .about-grid.six-dims {
        grid-template-columns: 1fr;
    }

    .stages-grid {
        grid-template-columns: 1fr;
    }

    .stages-grid.five-steps {
        grid-template-columns: 1fr;
    }

    .stages-grid.six-steps {
        grid-template-columns: 1fr;
    }

    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .cta-card {
        padding: 36px 20px;
    }

    .cta-urgency {
        font-size: 0.85rem;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-nav-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .footer-legal {
        justify-content: flex-start;
        gap: 12px;
    }

    .section {
        padding: 80px 0;
    }

    .cases-overview {
        flex-wrap: wrap;
        gap: 20px;
        padding: 24px;
    }

    .overview-divider {
        display: none;
    }

    .overview-item {
        flex: 1;
        min-width: 100px;
    }

    .case-card-header {
        padding: 20px 20px 12px;
    }

    .case-card-top {
        padding: 20px 20px 12px;
    }

    .case-card-body {
        padding: 0 20px 20px;
    }

    .case-results-grid {
        flex-direction: column;
    }

    .result-block {
        min-width: auto;
    }

    .mid-cta-inner {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }

    .cta-form-simple .form-row-inline {
        flex-direction: column;
    }

    .floating-cta {
        bottom: 16px;
        right: 16px;
    }

    .float-btn-primary span {
        display: none;
    }

    .float-btn-primary {
        padding: 14px;
    }

    .team-row {
        justify-content: center;
    }

    .process-timeline::before {
        left: 24px;
    }

    .step-number {
        width: 48px;
        height: 48px;
        font-size: 0.9rem;
    }

    .process-step {
        gap: 20px;
    }

    .process-step[data-aos="fade-left"],
    .process-step[data-aos="fade-right"] {
        transform: translateY(40px);
    }

    .process-step[data-aos].aos-animate {
        transform: translate(0);
    }

    .case-filters {
        gap: 8px;
    }

    .filter-btn {
        padding: 6px 14px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .hero-title {
        font-size: 2.25rem;
    }
}