:root {
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #e94560;
    --accent-hover: #c73650;
    --accent-soft: rgba(233, 69, 96, 0.12);
    --gradient-start: #1a1a2e;
    --gradient-mid: #16213e;
    --gradient-end: #0f3460;
    --text: #2d2d44;
    --text-light: #6b6b80;
    --bg: #f8f9fc;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.72);
    --border: #e2e4ed;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 12px 32px rgba(233, 69, 96, 0.16);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.3s ease;
    --header-height: 64px;
}

[data-theme="dark"] {
    --primary: #e8e8f0;
    --secondary: #c0c0d0;
    --accent: #ff6b81;
    --accent-hover: #ff8a9a;
    --accent-soft: rgba(255, 107, 129, 0.15);
    --gradient-start: #0d0d1a;
    --gradient-mid: #121220;
    --gradient-end: #1a1a35;
    --text: #d0d0e0;
    --text-light: #9090a8;
    --bg: #121220;
    --bg-card: #1c1c30;
    --bg-glass: rgba(28, 28, 48, 0.78);
    --border: #2a2a42;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 12px 32px rgba(255, 107, 129, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    font-size: 16px;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--accent-hover);
}

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

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

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: background var(--transition), border-color var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
    white-space: nowrap;
    transition: opacity var(--transition);
}

.logo:hover {
    opacity: 0.85;
    color: var(--primary);
}

.logo svg {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    transition: transform var(--transition);
}

.logo:hover svg {
    transform: rotate(-6deg) scale(1.05);
}

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

.nav a {
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 0.92rem;
    color: var(--text);
    font-weight: 500;
    transition: all var(--transition);
    position: relative;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: width var(--transition);
}

.nav a:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.nav a:hover::after {
    width: 60%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 4px 12px;
    gap: 6px;
    transition: all var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.88rem;
    color: var(--text);
    width: 140px;
    font-family: inherit;
}

.search-box input::placeholder {
    color: var(--text-light);
}

.search-box svg {
    width: 16px;
    height: 16px;
    stroke: var(--text-light);
    flex-shrink: 0;
}

.theme-toggle,
.menu-toggle {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
    transform: translateY(-1px);
}

.theme-toggle svg,
.menu-toggle svg {
    width: 18px;
    height: 18px;
    stroke: var(--text);
    transition: stroke var(--transition), transform var(--transition);
}

.theme-toggle:hover svg {
    transform: rotate(20deg);
}

.menu-toggle {
    display: none;
}

/* ===== Mobile menu ===== */
.mobile-menu {
    display: none;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    gap: 4px;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.mobile-menu a {
    padding: 10px 14px;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text);
    transition: all var(--transition);
}

.mobile-menu a:hover {
    background: var(--accent-soft);
    color: var(--accent);
    padding-left: 20px;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.85rem;
    color: var(--text-light);
}

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

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

.breadcrumb span {
    margin: 0 6px;
}

/* ===== Hero ===== */
.hero {
    padding: 48px 0 56px;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(233, 69, 96, 0.18) 0%, transparent 70%);
    pointer-events: none;
    animation: floatGlow 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(15, 52, 96, 0.4) 0%, transparent 70%);
    pointer-events: none;
    animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-20px, 20px) scale(1.08); }
}

.hero-inner {
    display: flex;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    min-width: 300px;
}

.hero-content h1 {
    font-size: 2.2rem;
    line-height: 1.3;
    margin-bottom: 16px;
    font-weight: 800;
    letter-spacing: -0.02em;
    animation: fadeInUp 0.7s ease both;
}

.hero-content h1 em {
    color: var(--accent);
    font-style: normal;
    position: relative;
}

.hero-content p {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 24px;
    max-width: 560px;
    animation: fadeInUp 0.7s ease 0.1s both;
}

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

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    animation: fadeInUp 0.7s ease 0.2s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition);
    border: none;
    cursor: pointer;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 16px rgba(233, 69, 96, 0.35);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    color: #fff;
    box-shadow: 0 8px 24px rgba(233, 69, 96, 0.45);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(233, 69, 96, 0.08);
    transform: translateY(-2px);
}

.hero-visual {
    flex: 1;
    min-width: 280px;
    display: flex;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.15s both;
}

.hero-visual svg {
    width: 100%;
    max-width: 420px;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.25));
}

/* ===== Stats ===== */
.stats {
    padding: 48px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #ff8a9a);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

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

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

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1.2;
    margin-bottom: 4px;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    font-weight: 500;
}

/* ===== Section ===== */
.section {
    padding: 64px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 44px;
}

.section-header h2 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
    transition: color var(--transition);
}

.section-header p {
    color: var(--text-light);
    font-size: 1rem;
    max-width: 640px;
    margin: 0 auto;
}

.section-header .divider {
    width: 48px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #ff8a9a);
    border-radius: 2px;
    margin: 16px auto 0;
    transition: width var(--transition);
}

.section-header:hover .divider {
    width: 72px;
}

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

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

/* ===== Card ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--accent-soft), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

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

.card:hover::after {
    opacity: 1;
}

.card > * {
    position: relative;
    z-index: 1;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent), #ff8a9a);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: 0 4px 12px rgba(233, 69, 96, 0.25);
}

.card:hover .card-icon {
    transform: rotate(-6deg) scale(1.08);
    box-shadow: 0 8px 20px rgba(233, 69, 96, 0.35);
}

.card-icon svg {
    width: 26px;
    height: 26px;
    stroke: #fff;
}

.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
    transition: color var(--transition);
}

.card p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== Ranking list ===== */
.ranking-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ranking-item {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.ranking-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent);
    transform: scaleY(0);
    transition: transform var(--transition);
}

.ranking-item:hover {
    border-color: var(--accent);
    transform: translateX(6px);
    box-shadow: var(--shadow-hover);
}

.ranking-item:hover::before {
    transform: scaleY(1);
}

.ranking-badge {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.95rem;
    flex-shrink: 0;
    background: var(--bg);
    color: var(--text-light);
    transition: transform var(--transition);
}

.ranking-item:hover .ranking-badge {
    transform: scale(1.1);
}

.ranking-badge.top1 {
    background: linear-gradient(135deg, #ffd700, #ffb800);
    color: #7a5c00;
    box-shadow: 0 2px 8px rgba(255, 215, 0, 0.4);
}

.ranking-badge.top2 {
    background: linear-gradient(135deg, #d8d8d8, #b0b0b0);
    color: #4a4a4a;
    box-shadow: 0 2px 8px rgba(192, 192, 192, 0.4);
}

.ranking-badge.top3 {
    background: linear-gradient(135deg, #e09a5a, #cd7f32);
    color: #fff;
    box-shadow: 0 2px 8px rgba(205, 127, 50, 0.4);
}

.ranking-info {
    flex: 1;
    min-width: 0;
}

.ranking-info h4 {
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 2px;
    transition: color var(--transition);
}

.ranking-info p {
    font-size: 0.82rem;
    color: var(--text-light);
}

.ranking-score {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--accent);
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* ===== Article cards ===== */
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

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

.article-thumb {
    height: 160px;
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    position: relative;
    overflow: hidden;
}

.article-thumb svg {
    width: 100%;
    height: 100%;
    transition: transform 0.5s ease;
}

.article-card:hover .article-thumb svg {
    transform: scale(1.06);
}

.article-body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.article-meta span {
    position: relative;
}

.article-meta span + span::before {
    content: '·';
    margin-right: 12px;
    color: var(--border);
}

.article-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    line-height: 1.4;
    transition: color var(--transition);
}

.article-card:hover .article-body h3 {
    color: var(--accent);
}

.article-body p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
    flex: 1;
}

.article-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.88rem;
    font-weight: 600;
    margin-top: 12px;
    color: var(--accent);
    transition: gap var(--transition), color var(--transition);
}

.article-card:hover .article-link {
    gap: 8px;
}

/* ===== FAQ ===== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 900px;
    margin: 0 auto;
}

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

.faq-item:hover {
    border-color: var(--accent);
}

.faq-item.active {
    border-color: var(--accent);
    box-shadow: var(--shadow-hover);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: none;
    border: none;
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    gap: 16px;
    transition: color var(--transition), background var(--transition);
}

.faq-question:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.faq-question svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-light);
    flex-shrink: 0;
    transition: transform var(--transition), stroke var(--transition);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
    stroke: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.active .faq-answer {
    max-height: 600px;
}

.faq-answer-inner {
    padding: 0 24px 20px;
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.8;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin: 0 24px 20px;
    padding-left: 0;
    padding-right: 0;
}

/* ===== HowTo steps ===== */
.howto-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.howto-step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
    position: relative;
}

.howto-step:hover {
    border-color: var(--accent);
    transform: translateX(6px);
    box-shadow: var(--shadow-hover);
}

.howto-num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #ff8a9a);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(233, 69, 96, 0.3);
    transition: transform var(--transition);
}

.howto-step:hover .howto-num {
    transform: scale(1.12);
}

.howto-step h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
    transition: color var(--transition);
}

.howto-step p {
    font-size: 0.9rem;
    color: var(--text-light);
}

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

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}

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

.contact-card svg {
    width: 32px;
    height: 32px;
    stroke: var(--accent);
    margin: 0 auto 12px;
    transition: transform var(--transition);
}

.contact-card:hover svg {
    transform: scale(1.15);
}

.contact-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
    transition: color var(--transition);
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.contact-card a {
    font-size: 0.9rem;
}

/* ===== Footer ===== */
.footer {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 100%);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 30px;
    margin-top: 0;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.5;
}

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

.footer h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 8px;
}

.footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.footer p {
    font-size: 0.88rem;
    line-height: 1.8;
    margin-bottom: 8px;
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.88rem;
    display: block;
    margin-bottom: 8px;
    transition: all var(--transition);
    position: relative;
    padding-left: 0;
}

.footer a:hover {
    color: var(--accent);
    padding-left: 6px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.82rem;
}

.footer-bottom-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-bottom-links a {
    display: inline;
    margin: 0;
}

.footer-bottom-links a:hover {
    padding-left: 0;
}

/* ===== Back to top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(233, 69, 96, 0.35);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    background: var(--accent-hover);
    box-shadow: 0 8px 24px rgba(233, 69, 96, 0.5);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    stroke: #fff;
}

/* ===== Reveal animation ===== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== Search overlay ===== */
.search-overlay {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 20px;
    z-index: 999;
    box-shadow: var(--shadow);
    animation: slideDown 0.25s ease;
}

.search-overlay.active {
    display: block;
}

.search-overlay input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    outline: none;
    transition: all var(--transition);
}

.search-overlay input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-hint {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 10px;
}

/* ===== Inline style helpers from HTML ===== */
p[style*="text-align:center"] {
    margin-top: 24px;
    font-size: 0.88rem;
    color: var(--text-light);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .hero-content h1 {
        font-size: 1.9rem;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .nav {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .search-box {
        display: none;
    }

    .hero {
        padding: 36px 0 44px;
    }

    .hero-content h1 {
        font-size: 1.6rem;
    }

    .hero-content p {
        font-size: 0.95rem;
    }

    .hero-inner {
        gap: 24px;
    }

    .stats {
        padding: 36px 0;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .stat-card {
        padding: 22px 16px;
    }

    .stat-number {
        font-size: 1.7rem;
    }

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

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

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

    .section {
        padding: 44px 0;
    }

    .section-header {
        margin-bottom: 32px;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .ranking-item {
        padding: 14px 16px;
        gap: 12px;
    }

    .ranking-item:hover {
        transform: translateX(3px);
    }

    .howto-step {
        padding: 18px;
        gap: 14px;
    }

    .howto-step:hover {
        transform: translateX(3px);
    }

    .card {
        padding: 22px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }

    .faq-question {
        padding: 16px 18px;
        font-size: 0.92rem;
    }

    .faq-answer-inner {
        margin: 0 18px 16px;
        font-size: 0.88rem;
    }
}

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

    .hero-actions {
        flex-direction: column;
    }

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

    .hero-content h1 {
        font-size: 1.4rem;
    }

    .section-header h2 {
        font-size: 1.25rem;
    }

    .ranking-score {
        font-size: 0.98rem;
    }

    .article-thumb {
        height: 140px;
    }
}

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

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ===== Focus visible ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ===== Selection ===== */
::selection {
    background: var(--accent);
    color: #fff;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}