/* ============================================================
   扶摇新域智能科技 - 官方网站样式表
   Fuyao Xinyu Intelligent Technology - Official Website
   ============================================================ */

/* --- CSS Variables --- */
:root {
    --primary: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #3730A3;
    --accent: #7C3AED;
    --accent-light: #A78BFA;
    --accent-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #EC4899 100%);
    --text-primary: #1E1B4B;
    --text-secondary: #4B5563;
    --text-muted: #9CA3AF;
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFC;
    --bg-alt: #F1F5F9;
    --bg-dark: #0F172A;
    --bg-card: #FFFFFF;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 40px -10px rgba(0,0,0,0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --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;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

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

/* --- Section Common --- */
.section {
    padding: 100px 0;
}

.section-alt {
    background: var(--bg-light);
}

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

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary);
    background: rgba(79, 70, 229, 0.08);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.3;
}

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

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.subsection-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: center;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 100px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.7);
    transform: translateY(-2px);
}

.btn-accent {
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    font-weight: 600;
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4);
}

.btn-block {
    width: 100%;
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    height: 40px;
    width: 40px;
    border-radius: 8px;
    object-fit: contain;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(79, 70, 229, 0.06);
}

.nav-link-highlight {
    color: #fff !important;
    background: var(--accent-gradient);
    font-weight: 600;
    padding: 8px 20px;
}

.nav-link-highlight:hover {
    opacity: 0.9;
    color: #fff !important;
    background: var(--accent-gradient);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

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

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

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

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

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 30%, #312E81 60%, #4C1D95 100%);
    overflow: hidden;
    text-align: center;
    padding: 120px 24px 80px;
}

.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-particles::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

.hero-particles::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.12) 0%, transparent 70%);
    bottom: -100px;
    left: -50px;
    border-radius: 50%;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.05); }
    66% { transform: translate(-20px, 10px) scale(0.95); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 100px;
    color: rgba(255,255,255,0.8);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-title {
    margin-bottom: 24px;
}

.title-line {
    display: block;
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.title-line.accent {
    background: linear-gradient(135deg, #A78BFA 0%, #F472B6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 18px);
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
}

.stat-unit {
    font-size: 16px;
    font-weight: 400;
    color: rgba(255,255,255,0.7);
}

.stat-label {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    margin-top: 4px;
}

/* Scroll indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
    font-size: 12px;
    animation: fadeInUp 1s ease-out 1s both;
}

.scroll-mouse {
    width: 24px;
    height: 40px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 100px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-dot {
    width: 4px;
    height: 8px;
    background: rgba(255,255,255,0.5);
    border-radius: 4px;
    animation: scrollDot 2s ease-in-out infinite;
}

@keyframes scrollDot {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(12px); opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition);
}

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

.about-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    color: var(--primary);
    background: rgba(79, 70, 229, 0.08);
    border-radius: var(--radius);
    padding: 12px;
}

.about-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.about-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-card em {
    color: var(--primary);
    font-style: italic;
    font-weight: 500;
}

.about-story {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.story-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
}

.story-content p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 12px;
}

.story-content strong {
    color: var(--primary);
}

/* ============================================================
   AI EDUCATION SECTION
   ============================================================ */
.product-positioning {
    margin-bottom: 48px;
}

.positioning-card {
    background: var(--accent-gradient);
    border-radius: var(--radius-lg);
    padding: 32px 40px;
    text-align: center;
    color: #fff;
}

.pos-number {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    background: rgba(255,255,255,0.2);
    padding: 4px 16px;
    border-radius: 100px;
    margin-bottom: 12px;
}

.positioning-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}

.positioning-card p {
    font-size: 15px;
    opacity: 0.9;
}

/* Product Modules */
.product-modules {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

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

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.module-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.module-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

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

.teacher-icon {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
}

.hardware-icon {
    background: rgba(124, 58, 237, 0.1);
    color: var(--accent);
}

.parent-icon {
    background: rgba(236, 72, 153, 0.1);
    color: #EC4899;
}

.module-header h3 {
    font-size: 18px;
    font-weight: 700;
    flex: 1;
}

.module-badge {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 100px;
    background: var(--bg-alt);
    color: var(--text-muted);
}

.module-features li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 0;
    border-bottom: 1px solid var(--border-light);
    line-height: 1.6;
}

.module-features li:last-child {
    border-bottom: none;
}

.module-features li strong {
    color: var(--text-primary);
}

/* Core Capabilities */
.core-capabilities {
    margin-bottom: 64px;
}

.capability-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.capability-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: all var(--transition);
}

.capability-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
}

.cap-icon {
    font-size: 28px;
    display: block;
    margin-bottom: 8px;
}

.capability-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.capability-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Comparison Table */
.solution-comparison {
    margin-bottom: 64px;
}

.comparison-table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.comparison-table th {
    background: var(--bg-alt);
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    font-size: 15px;
    white-space: nowrap;
}

.comparison-table th.highlight-col {
    background: rgba(79, 70, 229, 0.06);
    color: var(--primary);
}

.comparison-table td {
    padding: 14px 20px;
    border-top: 1px solid var(--border-light);
    color: var(--text-secondary);
}

.comparison-table td.highlight-col {
    color: var(--text-primary);
    font-weight: 500;
    background: rgba(79, 70, 229, 0.02);
}

/* Market Data */
.market-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.market-stat {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition);
}

.market-stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.market-number {
    display: block;
    font-size: clamp(28px, 4vw, 36px);
    font-weight: 900;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.market-number span {
    font-size: 18px;
    font-weight: 500;
}

.market-label {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.market-label small {
    color: var(--text-muted);
}

/* ============================================================
   AI MUSIC SECTION
   ============================================================ */
.music-content {
    max-width: 900px;
    margin: 0 auto;
}

.music-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.music-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.music-wave-container {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    height: 200px;
}

.music-wave-bar {
    width: 14px;
    background: var(--accent-gradient);
    border-radius: 7px;
    animation: waveAnim 1.2s ease-in-out infinite;
    animation-delay: var(--delay);
    height: var(--height);
}

@keyframes waveAnim {
    0%, 100% { transform: scaleY(0.5); opacity: 0.5; }
    50% { transform: scaleY(1); opacity: 1; }
}

.music-text h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.music-text > p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.music-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.music-feat {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feat-icon {
    font-size: 24px;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(79, 70, 229, 0.06);
    border-radius: var(--radius-sm);
}

.music-feat h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.music-feat p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================================
   AI MV SECTION
   ============================================================ */
.mv-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}

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

.mv-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.mv-card-visual {
    background: linear-gradient(135deg, #1E1B4B, #312E81);
    border-radius: var(--radius);
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
}

.mv-play-symbol {
    font-size: 32px;
    color: rgba(255,255,255,0.4);
    position: absolute;
    z-index: 1;
}

.mv-frame-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    width: 100%;
    height: 100%;
    padding: 8px;
}

.mv-frame {
    background: rgba(255,255,255,0.05);
    border-radius: 4px;
}

.mv-frame-alt {
    background: rgba(255,255,255,0.08);
}

.mv-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.mv-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Pipeline */
.mv-pipeline {
    text-align: center;
}

.pipeline-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.pipeline-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 16px;
    text-align: center;
    min-width: 120px;
    transition: all var(--transition);
}

.pipeline-step:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.step-number {
    font-size: 24px;
    font-weight: 900;
    color: var(--primary);
    margin-bottom: 4px;
}

.pipeline-step h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.pipeline-step p {
    font-size: 12px;
    color: var(--text-muted);
}

.pipeline-arrow {
    font-size: 24px;
    color: var(--text-muted);
    font-weight: 300;
}

/* ============================================================
   TEAM SECTION
   ============================================================ */
.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition);
}

.team-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.team-avatar {
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: rgba(79, 70, 229, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.team-avatar svg {
    width: 40px;
    height: 40px;
}

.team-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.team-role {
    display: block;
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 12px;
}

.team-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.team-extra {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.team-card-compact {
    text-align: left;
}

.team-card-compact h3 {
    text-align: center;
    margin-bottom: 12px;
}

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon-wrap {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    background: rgba(79, 70, 229, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-form-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

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

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-light);
    transition: all var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background: var(--bg-white);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    height: 48px;
    width: 48px;
    border-radius: 8px;
    object-fit: contain;
    margin-bottom: 12px;
}

.footer-brand h3 {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 4px;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.6;
}

.footer-tagline {
    margin-top: 12px;
    color: rgba(255,255,255,0.4) !important;
    font-style: italic;
}

.footer-links h4,
.footer-products h4 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 16px;
}

.footer-links ul,
.footer-products ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: #fff;
}

.footer-products li {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

/* ============================================================
   AI ESSAY GRADING SECTION
   ============================================================ */
.essay-types-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    margin-bottom: 64px;
}

.essay-type-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    transition: all var(--transition);
}

.essay-type-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: #10B981;
}

.essay-type-icon {
    font-size: 32px;
    display: block;
    margin-bottom: 8px;
}

.essay-type-card h3 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.essay-type-card p {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.essay-score-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
    .about-grid,
    .product-modules,
    .capability-grid,
    .team-grid,
    .market-grid,
    .essay-types-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .music-showcase {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .music-wave-container {
        height: 140px;
    }

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

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

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

    /* Mobile nav */
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        transition: transform var(--transition);
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-link {
        padding: 12px 16px;
        border-radius: var(--radius-sm);
    }

    /* Hero */
    .hero-stats {
        gap: 24px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    /* Grids */
    .about-grid,
    .product-modules,
    .capability-grid,
    .team-grid,
    .market-grid,
    .team-extra,
    .mv-grid,
    .essay-types-grid {
        grid-template-columns: 1fr;
    }

    .pipeline-steps {
        flex-direction: column;
    }

    .pipeline-arrow {
        transform: rotate(90deg);
    }

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

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

    .comparison-table {
        font-size: 13px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 10px 12px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 24px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }

    .contact-form-wrap {
        padding: 20px;
    }
}

/* --- 表单消息提示 --- */
.form-msg {
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 12px;
}
.form-msg-success {
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
}
.form-msg-error {
    background: #FEF2F2;
    color: #991B1B;
    border: 1px solid #FECACA;
}