/* ============================================================
   离子迁移谱铺路人 —— 网站样式表
   ============================================================ */

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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --accent: #06b6d4;
    --accent-dark: #0891a1;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --dark-3: #334155;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --gray-bg: #f8fafc;
    --white: #ffffff;
    --green: #10b981;
    --orange: #f59e0b;
    --purple: #8b5cf6;
    --red: #ef4444;
    --gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

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

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 68px;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.nav-container {
    width: 100%;
    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;
    color: var(--white);
    font-size: 1.15rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    gap: 8px;
    list-style: none;
}

.nav-menu a {
    color: rgba(255,255,255,0.75);
    font-size: 0.92rem;
    padding: 8px 14px;
    border-radius: 8px;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-menu a:hover {
    color: var(--white);
    background: rgba(255,255,255,0.1);
}

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

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

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--gradient-dark);
    color: var(--white);
    padding: 100px 24px 60px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 600px 400px at 20% 30%, rgba(37,99,235,0.3), transparent),
        radial-gradient(ellipse 500px 500px at 80% 70%, rgba(6,182,212,0.2), transparent);
    animation: heroPulse 8s ease-in-out infinite;
}

@keyframes heroPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

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

.hero-badge {
    display: inline-block;
    background: rgba(37,99,235,0.3);
    border: 1px solid rgba(96,165,250,0.5);
    color: #93c5fd;
    padding: 6px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-title .highlight {
    color: #60a5fa;
    display: inline;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: rgba(255,255,255,0.8);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    color: #60a5fa;
    line-height: 1.1;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.65);
    margin-top: 4px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(37,99,235,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.5);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 0.85rem;
    animation: scrollBob 2s ease-in-out infinite;
}

.scroll-arrow {
    font-size: 1.5rem;
    margin-top: 4px;
}

@keyframes scrollBob {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== Section Base ===== */
.section {
    padding: 80px 0;
}

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

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

.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 12px;
    color: var(--dark);
}

.section-title .highlight {
    color: var(--primary);
}

.section-desc {
    text-align: center;
    color: var(--gray);
    font-size: 1.05rem;
    margin-bottom: 48px;
}

/* ===== About / 我们是谁 ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.about-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
}

.about-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.about-card.main-card {
    background: linear-gradient(135deg, #eff6ff 0%, #f0fdfa 100%);
    border-color: #bfdbfe;
}

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

.about-card h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.about-card p {
    color: var(--gray);
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.about-list {
    padding: 0;
}

.about-list li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    color: var(--gray);
    font-size: 0.92rem;
}

.about-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.about-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.tag {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ===== 差异化优势 ===== */
.diff-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.diff-card {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid #bfdbfe;
}

.diff-card h4 {
    color: var(--primary-dark);
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.diff-card ul {
    padding: 0;
}

.diff-card li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.9rem;
    color: var(--dark-3);
}

.diff-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--green);
    font-weight: bold;
}

/* ===== Tech Section ===== */
.tech-tabs, .app-tabs, .product-tabs, .platform-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 36px;
}

.tech-tab, .app-tab, .prod-tab, .tab-btn {
    padding: 10px 22px;
    border: 2px solid var(--gray-light);
    background: var(--white);
    color: var(--gray);
    border-radius: 30px;
    font-size: 0.92rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tech-tab:hover, .app-tab:hover, .prod-tab:hover, .tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tech-tab.active, .app-tab.active, .prod-tab.active, .tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

.tech-content, .app-content, .product-content {
    max-width: 900px;
    margin: 0 auto;
}

.tech-panel, .app-panel, .prod-panel {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tech-panel.active, .app-panel.active, .prod-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tech-panel h3, .app-panel h3, .prod-panel h3 {
    font-size: 1.3rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.tech-panel > p, .app-panel > p, .prod-panel > p {
    color: var(--gray);
    margin-bottom: 20px;
}

.tech-detail, .app-detail {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 16px;
}

.tech-detail h4, .app-detail h4 {
    font-size: 1.05rem;
    color: var(--primary-dark);
    margin-bottom: 10px;
}

.tech-detail ul, .app-detail ul {
    padding: 0;
}

.tech-detail li, .app-detail li {
    padding: 5px 0;
    padding-left: 18px;
    position: relative;
    font-size: 0.9rem;
    color: var(--dark-3);
}

.tech-detail li::before, .app-detail li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.tech-detail ol {
    padding-left: 20px;
}

.tech-detail ol li {
    padding: 5px 0;
    font-size: 0.9rem;
    color: var(--dark-3);
    list-style: decimal;
}

.formula {
    font-family: 'Times New Roman', serif;
    font-size: 1.2rem;
    font-style: italic;
    background: #f1f5f9;
    padding: 8px 16px;
    border-radius: 6px;
    display: inline-block;
    margin: 8px 0;
}

/* ===== Compare Table ===== */
.compare-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
    font-size: 0.9rem;
}

.compare-table th {
    background: var(--primary);
    color: var(--white);
    padding: 10px 14px;
    text-align: left;
}

.compare-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--gray-light);
}

.compare-table tr:nth-child(even) {
    background: var(--gray-bg);
}

/* ===== External Readings ===== */
.external-readings {
    margin-top: 48px;
    padding-top: 36px;
    border-top: 2px solid var(--gray-light);
}

.external-readings h3 {
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.ext-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.ext-card {
    display: block;
    padding: 16px 20px;
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.ext-card:hover {
    background: #eff6ff;
    border-color: #93c5fd;
    transform: translateY(-2px);
}

.ext-title {
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--primary-dark);
}

.ext-summary {
    font-size: 0.85rem;
    color: var(--gray);
    margin-bottom: 8px;
}

.ext-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ext-tags span {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
}

/* ===== Search Box ===== */
.search-box {
    max-width: 500px;
    margin: 0 auto 24px;
}

.search-box input {
    width: 100%;
    padding: 12px 20px;
    border: 2px solid var(--gray-light);
    border-radius: 30px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.search-box input:focus {
    border-color: var(--primary);
}

/* ===== Articles Grid ===== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.article-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.article-platform {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
    align-self: flex-start;
}

.article-platform.wechat { background: #e8f5e9; color: #2e7d32; }
.article-platform.zhihu { background: #e3f2fd; color: #1565c0; }
.article-platform.bilibili { background: #fce4ec; color: #c62828; }
.article-platform.douyin { background: #ede7f6; color: #4527a0; }

.article-card h3 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 10px;
    line-height: 1.4;
}

.article-summary {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 12px;
    flex-grow: 1;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.article-tags span {
    background: var(--gray-bg);
    color: var(--gray);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
}

.article-insight {
    background: #fefce8;
    border-left: 3px solid var(--orange);
    padding: 10px 14px;
    font-size: 0.85rem;
    color: var(--dark-3);
    border-radius: 0 6px 6px 0;
    margin-bottom: 12px;
}

.article-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--gray-light);
}

.btn-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

.btn-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.article-date {
    font-size: 0.8rem;
    color: var(--gray);
}

/* ===== Product Section ===== */
.sub-title {
    font-size: 1.3rem;
    color: var(--primary-dark);
    margin: 36px 0 16px;
    padding-left: 12px;
    border-left: 4px solid var(--primary);
}

.products-flow {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 32px 0;
}

.product-level {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 24px;
    min-width: 220px;
    max-width: 260px;
    flex: 1;
    transition: var(--transition);
}

.product-level:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.level-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gradient);
    color: var(--white);
    border-radius: 50%;
    font-weight: 800;
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.level-content h3 {
    font-size: 1rem;
    color: var(--dark);
    margin-bottom: 4px;
}

.level-sub {
    font-size: 0.82rem;
    color: var(--gray);
    margin-bottom: 10px;
}

.product-level ul {
    padding: 0;
    margin-bottom: 10px;
}

.product-level li {
    padding: 4px 0;
    padding-left: 14px;
    position: relative;
    font-size: 0.85rem;
    color: var(--dark-3);
}

.product-level li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--green);
    font-size: 0.8rem;
}

.level-note {
    font-size: 0.82rem;
    color: var(--primary);
    font-style: italic;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px dashed var(--gray-light);
}

.flow-arrow {
    font-size: 1.8rem;
    color: var(--primary);
    align-self: center;
    font-weight: bold;
}

/* Product tabs content */
.prod-header {
    margin-bottom: 20px;
    text-align: center;
}

.prod-desc {
    color: var(--gray);
    font-size: 0.95rem;
}

.prod-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.prod-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: 10px;
    padding: 20px;
    transition: var(--transition);
}

.prod-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.prod-card h4 {
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.prod-card p {
    font-size: 0.88rem;
    color: var(--gray);
    margin-bottom: 10px;
}

.prod-card ul {
    padding: 0;
    margin: 0;
}

.prod-card li {
    padding: 4px 0;
    font-size: 0.85rem;
    color: var(--dark-3);
    padding-left: 14px;
    position: relative;
}

.prod-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* Purpose grid */
.purpose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.purpose-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.purpose-card:hover {
    box-shadow: 0 4px 16px rgba(37,99,235,0.1);
    transform: translateY(-3px);
}

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

.purpose-card h4 {
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.purpose-card p {
    font-size: 0.88rem;
    color: var(--gray);
    margin-bottom: 10px;
}

.purpose-card ul {
    padding: 0;
    text-align: left;
}

.purpose-card li {
    padding: 4px 0;
    font-size: 0.85rem;
    color: var(--gray);
}

/* ===== Patent Section ===== */
.patent-section {
    margin-top: 40px;
}

.patent-section h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 20px;
}

.patent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.patent-card {
    background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
    border: 1px solid #fde68a;
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
}

.patent-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.patent-number {
    font-size: 0.8rem;
    color: var(--orange);
    font-weight: 700;
    margin-bottom: 6px;
}

.patent-card h4 {
    font-size: 0.95rem;
    color: var(--dark);
    margin-bottom: 6px;
}

.patent-card p {
    font-size: 0.82rem;
    color: var(--gray);
}

/* ===== Direction Cards ===== */
.direction-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.direction-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.direction-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.direction-card.primary {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border-color: #93c5fd;
}

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

.direction-card h3 {
    font-size: 1.15rem;
    color: var(--dark);
    margin-bottom: 10px;
}

.direction-desc {
    color: var(--gray);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.direction-card ul {
    padding: 0;
    margin-bottom: 16px;
}

.direction-card li {
    padding: 5px 0;
    padding-left: 18px;
    position: relative;
    font-size: 0.88rem;
    color: var(--dark-3);
}

.direction-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.direction-tag {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
}

/* ===== Social Grid ===== */
.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.social-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
}

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

.social-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.social-card h3 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 6px;
}

.social-name {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.social-card p {
    font-size: 0.85rem;
    color: var(--gray);
    margin-bottom: 12px;
}

.social-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.social-stats span {
    background: var(--gray-bg);
    color: var(--gray);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.78rem;
}

.wechat-card { border-top: 4px solid #07c160; }
.zhihu-card { border-top: 4px solid #0084ff; }
.bilibili-card { border-top: 4px solid #fb7299; }
.douyin-card { border-top: 4px solid #1a1a2e; }

/* ===== Contact Section ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.contact-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius);
    padding: 32px;
}

.contact-card h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 20px;
}

.contact-flow {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.step-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gradient);
    color: var(--white);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.step-text strong {
    display: block;
    color: var(--dark);
    font-size: 1rem;
    margin-bottom: 2px;
}

.step-text p {
    color: var(--gray);
    font-size: 0.85rem;
}

.contact-info {
    margin-bottom: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--gray-light);
    gap: 12px;
}

.contact-label {
    font-weight: 600;
    color: var(--dark);
    min-width: 60px;
    font-size: 0.9rem;
}

.contact-value {
    color: var(--gray);
    font-size: 0.9rem;
    flex-grow: 1;
}

.copy-btn {
    margin-left: 8px;
    padding: 3px 12px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-size: 0.78rem;
    cursor: pointer;
    transition: background 0.2s;
}

.copy-btn:hover {
    background: var(--primary-dark);
}

.contact-slogan {
    margin-top: 20px;
    padding: 16px;
    background: linear-gradient(135deg, #eff6ff, #f0fdfa);
    border-radius: var(--radius);
    text-align: center;
}

.contact-slogan p {
    font-style: italic;
    color: var(--primary-dark);
    font-size: 0.95rem;
}

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 48px 0 32px;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--white);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-quote {
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.8;
}

.footer-copy {
    font-size: 0.82rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.8;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.4rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(37,99,235,0.4);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--dark);
    color: var(--white);
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 0.9rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ===== No Result ===== */
.no-result {
    text-align: center;
    padding: 40px;
    color: var(--gray);
    font-size: 1.1rem;
    grid-column: 1 / -1;
}

/* ===== Print Styles ===== */
@media print {
    .navbar, .back-to-top, .toast, .copy-btn, .hero-actions, .search-box { display: none !important; }
    .section { padding: 20px 0; }
    body { font-size: 12pt; }
}

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

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

    .products-flow {
        flex-direction: column;
        align-items: stretch;
    }

    .product-level {
        max-width: none;
    }

    .flow-arrow {
        transform: rotate(90deg);
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--dark);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 28px;
    }

    .section {
        padding: 64px 0;
    }

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

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

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

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

    .tech-tabs, .app-tabs, .product-tabs, .platform-tabs {
        gap: 6px;
    }

    .tech-tab, .app-tab, .prod-tab, .tab-btn {
        padding: 8px 14px;
        font-size: 0.82rem;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

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

    .container {
        padding: 0 16px;
    }

    .hero-stats {
        gap: 16px;
    }

    .stat-item {
        min-width: 70px;
    }
}