/* ========================================
   兑鸭惠家 · 公司官网 全局样式
   版本：V1.1 | 唐山星轨网络科技服务有限公司
   ======================================== */

/* === CSS Variables === */
:root {
    --brand-blue: #00A0F0;
    --brand-yellow: #FFD300;
    --brand-white: #FFFFFF;
    --brand-blue-dark: #0088CC;
    --brand-blue-light: #E5F5FD;
    --text-primary: #333333;
    --text-secondary: #999999;
    --text-white: #FFFFFF;
    --bg-light: #f5f6f7;
    --bg-white: #FFFFFF;
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --font-zh: "PingFang SC", "Microsoft YaHei", "微软雅黑", sans-serif;
    --font-en: "Segoe UI", "Arial Rounded MT Bold", sans-serif;
}

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

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

body {
    font-family: var(--font-zh);
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul, ol {
    list-style: none;
}

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

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-sm {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Typography === */
.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 3rem;
}

.text-center { text-align: center; }
.text-white { color: var(--text-white); }

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-zh);
    white-space: nowrap;
}

.btn-primary {
    background: var(--brand-blue);
    color: var(--text-white);
    border-color: var(--brand-blue);
}

.btn-primary:hover {
    background: var(--brand-blue-dark);
    border-color: var(--brand-blue-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(0, 160, 240, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--text-white);
    border-color: var(--text-white);
}

.btn-outline:hover {
    background: var(--text-white);
    color: var(--brand-blue);
}

.btn-outline-blue {
    background: transparent;
    color: var(--brand-blue);
    border-color: var(--brand-blue);
}

.btn-outline-blue:hover {
    background: var(--brand-blue);
    color: var(--text-white);
}

.btn-light {
    background: var(--text-white);
    color: var(--brand-blue);
    border-color: var(--text-white);
}

.btn-light:hover {
    background: var(--brand-blue-light);
    border-color: var(--brand-blue-light);
}

.btn-yellow {
    background: var(--brand-yellow);
    color: var(--text-primary);
    border-color: var(--brand-yellow);
}

.btn-yellow:hover {
    background: #e6be00;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(255, 211, 0, 0.4);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.85rem;
}

/* === Header / Navigation === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--brand-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.logo-icon .letter-d {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--brand-yellow);
    line-height: 1;
}

.logo-icon .letter-yh {
    font-family: var(--font-en);
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-white);
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
}

.logo-icon .house {
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.45rem;
    color: var(--text-white);
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--brand-blue);
    transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--brand-blue);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.has-sub::after {
    content: ' ▾';
    font-size: 0.7rem;
    position: static;
    width: auto;
    height: auto;
    background: none;
}

.submenu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-white);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-card-hover);
    padding: 8px 0;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.nav-item:hover .submenu {
    opacity: 1;
    visibility: visible;
}

.nav-item { position: relative; }

.submenu a {
    display: block;
    padding: 8px 20px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.submenu a:hover {
    background: var(--brand-blue-light);
    color: var(--brand-blue);
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* === Page Header (Banner) === */
.page-header {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-blue-dark) 100%);
    text-align: center;
    color: var(--text-white);
}

.page-header .page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.page-header .page-desc {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* === Cards === */
.card {
    background: var(--bg-white);
    border-radius: var(--border-radius-md);
    padding: 28px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card-hover);
}

.card-icon {
    width: 56px;
    height: 56px;
    background: var(--brand-blue-light);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

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

/* === Grid Layouts === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

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

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

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

.section-blue {
    background: var(--brand-blue);
    color: var(--text-white);
}

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

/* === CTA Section === */
.cta-section {
    background: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-blue-dark) 100%);
    padding: 80px 0;
    text-align: center;
    color: var(--text-white);
}

.cta-section .cta-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-section .cta-desc {
    font-size: 1.05rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* === Hero / Banner Section === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 160, 240, 0.92) 0%, rgba(0, 136, 204, 0.95) 100%),
                url('../images/hero-bg.jpg') center/cover no-repeat;
    color: var(--text-white);
    padding: 0 20px;
    position: relative;
}

.hero-content {
    max-width: 800px;
    padding-top: 60px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

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

/* === Value Cards (4-col home) === */
.value-cards .card {
    text-align: center;
}

.value-cards .card-icon {
    margin: 0 auto 16px;
}

/* === Stats / Numbers === */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 24px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--brand-blue);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* === Solutions Cards === */
.solution-card {
    padding: 36px 28px;
    text-align: center;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
    color: var(--text-white);
}

.solution-card.property {
    background: linear-gradient(135deg, #00A0F0, #0088CC);
}

.solution-card.merchant {
    background: linear-gradient(135deg, #FFD300, #e6be00);
    color: var(--text-primary);
}

.solution-card.owner {
    background: linear-gradient(135deg, #34c759, #28a745);
}

.solution-card .card-icon {
    background: rgba(255, 255, 255, 0.25);
    margin: 0 auto 16px;
    color: inherit;
}

/* === Product Tabs === */
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.product-tab {
    padding: 12px 28px;
    background: var(--bg-white);
    border: 2px solid var(--bg-light);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    font-family: var(--font-zh);
}

.product-tab:hover {
    border-color: var(--brand-blue);
    color: var(--brand-blue);
}

.product-tab.active {
    background: var(--brand-blue);
    color: var(--text-white);
    border-color: var(--brand-blue);
}

.product-content {
    display: none;
}

.product-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

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

/* === Feature List (alternating) === */
.feature-row {
    display: flex;
    align-items: center;
    gap: 48px;
    margin-bottom: 48px;
}

.feature-row.reverse {
    flex-direction: row-reverse;
}

.feature-img {
    flex: 1;
    min-width: 0;
}

.feature-img-placeholder {
    width: 100%;
    aspect-ratio: 16/10;
    background: var(--brand-blue-light);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--brand-blue);
}

.feature-text {
    flex: 1;
    min-width: 0;
}

.feature-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.feature-text p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 6px 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.feature-list li::before {
    content: '✓';
    color: var(--brand-blue);
    font-weight: 700;
}

/* === FAQ === */
.faq-item {
    border-bottom: 1px solid #e8e8e8;
    padding: 16px 0;
}

.faq-question {
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    user-select: none;
}

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

.faq-icon {
    transition: transform var(--transition-fast);
    font-size: 0.8rem;
}

.faq-item.open .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding-top: 12px;
}

/* === Contact Form === */
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-zh);
    transition: border-color var(--transition-fast);
    background: var(--bg-white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 3px rgba(0, 160, 240, 0.1);
}

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

.contact-info-side {
    background: var(--bg-light);
    border-radius: var(--border-radius-md);
    padding: 32px;
}

.contact-info-item {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.contact-info-icon {
    width: 40px;
    height: 40px;
    background: var(--brand-blue-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
}

.contact-info-text h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.contact-info-text p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* === News Cards === */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.news-card {
    background: var(--bg-white);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
}

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

.news-card-img {
    width: 100%;
    aspect-ratio: 16/10;
    background: var(--brand-blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
}

.news-card-body {
    padding: 20px;
}

.news-card-category {
    display: inline-block;
    font-size: 0.75rem;
    padding: 3px 10px;
    background: var(--brand-blue-light);
    color: var(--brand-blue);
    border-radius: 20px;
    margin-bottom: 8px;
}

.news-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* === Timeline / 发展历程 === */
.timeline {
    position: relative;
    padding: 40px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--brand-blue-light);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
    text-align: right;
}

.timeline-item:nth-child(odd) .timeline-content {
    padding-right: 48px;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-item:nth-child(even) .timeline-content {
    padding-left: 48px;
}

.timeline-dot {
    width: 16px;
    height: 16px;
    background: var(--brand-blue);
    border: 3px solid var(--brand-blue-light);
    border-radius: 50%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.timeline-content {
    flex: 1;
}

.timeline-content h4 {
    font-size: 1.1rem;
    color: var(--brand-blue);
    margin-bottom: 4px;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* === Culture / 企业文化 === */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.culture-card {
    text-align: center;
    padding: 32px 24px;
    background: var(--bg-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-card);
}

.culture-card .card-icon {
    margin: 0 auto 16px;
    background: var(--brand-blue);
    color: var(--text-white);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    font-size: 1.5rem;
}

/* === Footer === */
.footer {
    background: #1a1a2e;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    color: var(--text-white);
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 0.85rem;
    line-height: 1.8;
}

.footer-col h4 {
    font-size: 1rem;
    color: var(--text-white);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 0.85rem;
    padding: 4px 0;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--brand-blue);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
}

/* === Breadcrumb === */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--brand-blue);
}

.breadcrumb span {
    margin: 0 8px;
}

/* === Pagination === */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.page-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #ddd;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--bg-white);
}

.page-btn:hover {
    border-color: var(--brand-blue);
    color: var(--brand-blue);
}

.page-btn.active {
    background: var(--brand-blue);
    color: var(--text-white);
    border-color: var(--brand-blue);
}

/* === Form Success === */
.form-success {
    display: none;
    text-align: center;
    padding: 48px 24px;
}

.form-success.show {
    display: block;
    animation: fadeIn 0.4s ease;
}

.form-success-icon {
    font-size: 4rem;
    color: var(--brand-blue);
    margin-bottom: 16px;
}

.form-success h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.form-success p {
    color: var(--text-secondary);
}

/* === Numbers Animation === */
@keyframes countUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.stat-item.animated .stat-number {
    animation: countUp 0.6s ease forwards;
}

/* === Partners / Logo Grid === */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 24px;
    align-items: center;
}

.partner-logo {
    background: var(--bg-white);
    padding: 20px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all var(--transition-normal);
}

.partner-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.partner-card {
    background: var(--bg-white);
    border-radius: var(--border-radius);
    padding: 24px 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}
.partner-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.partner-card .partner-logo {
    width: 100px; height: 100px;
    margin: 0 auto 12px;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    background: var(--bg-light);
}
.partner-card .partner-logo img {
    width: 100%; height: 100%;
    object-fit: contain;
}
.partner-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}
.partner-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* === Responsive === */

/* 1366px */
@media (max-width: 1366px) {
    .container { max-width: 1100px; }
    .hero-title { font-size: 2.5rem; }
    .section-title { font-size: 2rem; }
}

/* 768px - Tablet */
@media (max-width: 768px) {
    html { font-size: 15px; }

    .menu-toggle { display: flex; }

    .nav {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 16px 0;
        gap: 0;
        box-shadow: var(--shadow-card);
        transform: translateY(-120%);
        transition: transform var(--transition-normal);
        z-index: 999;
    }

    .nav.open {
        transform: translateY(0);
    }

    .nav-link {
        padding: 12px 24px;
        width: 100%;
    }

    .submenu {
        position: static;
        transform: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        display: none;
        padding-left: 20px;
        background: var(--bg-light);
    }

    .nav-item.open .submenu {
        display: block;
    }

    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }

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

    .feature-row, .feature-row.reverse { flex-direction: column; }

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

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

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

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

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

    .timeline::before { left: 24px; }
    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        flex-direction: row;
        text-align: left;
    }
    .timeline-item:nth-child(odd) .timeline-content { padding-right: 0; padding-left: 48px; }
    .timeline-item:nth-child(even) .timeline-content { padding-left: 48px; }
    .timeline-dot { left: 24px; }

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

/* 375px - Mobile */
@media (max-width: 480px) {
    .hero-title { font-size: 1.7rem; }
    .section-title { font-size: 1.6rem; }
    .section { padding: 50px 0; }

    .hero-buttons { flex-direction: column; align-items: center; }
    .hero-buttons .btn { width: 100%; max-width: 280px; }

    .cta-buttons { flex-direction: column; align-items: center; }
    .cta-buttons .btn { width: 100%; max-width: 280px; }

    .product-tabs { flex-direction: column; align-items: stretch; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-number { font-size: 2rem; }

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

    .page-header .page-title { font-size: 1.8rem; }
}

/* === Utility === */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }