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

:root {
    --bg: #f5f7fb;
    --surface: rgba(255, 255, 255, 0.72);
    --surface-solid: #ffffff;
    --text: #1e2b3a;
    --text-secondary: #4a5a6e;
    --primary: #0f4c81;
    --primary-light: #2c6e9e;
    --accent: #e8a33d;
    --accent-light: #f0b45a;
    --border: rgba(221, 227, 234, 0.7);
    --shadow: 0 8px 32px rgba(15, 76, 129, 0.08);
    --shadow-hover: 0 16px 48px rgba(15, 76, 129, 0.14);
    --radius: 16px;
    --radius-sm: 12px;
    --glass-bg: rgba(255, 255, 255, 0.55);
    --glass-border: rgba(255, 255, 255, 0.6);
    --glass-blur: blur(18px) saturate(180%);
    --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body.dark {
    --bg: #0b1220;
    --surface: rgba(30, 41, 59, 0.72);
    --surface-solid: #1e293b;
    --text: #e2e8f0;
    --text-secondary: #a8b8cc;
    --primary: #4a9ede;
    --primary-light: #6db4e8;
    --accent: #f0b45a;
    --accent-light: #f5c878;
    --border: rgba(51, 65, 85, 0.7);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
    --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.5);
    --glass-bg: rgba(30, 41, 59, 0.55);
    --glass-border: rgba(71, 85, 105, 0.5);
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background 0.35s ease, color 0.35s ease;
    overflow-x: hidden;
    background-image:
        radial-gradient(ellipse at 10% 0%, rgba(15, 76, 129, 0.06) 0%, transparent 55%),
        radial-gradient(ellipse at 90% 100%, rgba(232, 163, 61, 0.05) 0%, transparent 55%);
    background-attachment: fixed;
}

body.dark {
    background-image:
        radial-gradient(ellipse at 10% 0%, rgba(74, 158, 222, 0.08) 0%, transparent 55%),
        radial-gradient(ellipse at 90% 100%, rgba(240, 180, 90, 0.06) 0%, transparent 55%);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.25s ease, opacity 0.25s ease;
}

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

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

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

.site-header {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
    box-shadow: 0 1px 20px rgba(15, 76, 129, 0.05);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    flex-wrap: wrap;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.5px;
    color: var(--text);
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.03);
    color: var(--text);
}

.logo svg {
    width: 42px;
    height: 42px;
    flex-shrink: 0;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(15, 76, 129, 0.2);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.logo:hover svg {
    box-shadow: 0 6px 20px rgba(15, 76, 129, 0.35);
    transform: rotate(-3deg);
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    font-size: 0.98rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    position: relative;
    transition: color 0.25s ease, border-color 0.25s ease;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.3s ease;
    border-radius: 2px;
}

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

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: 40px;
    padding: 4px 4px 4px 16px;
    border: 1px solid var(--glass-border);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.1);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px 0;
    font-size: 0.92rem;
    color: var(--text);
    outline: none;
    width: 140px;
    font-family: var(--font);
    transition: width 0.3s ease;
}

.search-box input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.search-box button {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border: none;
    border-radius: 40px;
    padding: 8px 18px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.88rem;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    font-family: var(--font);
    white-space: nowrap;
}

.search-box button:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(15, 76, 129, 0.3);
}

.search-box button:active {
    transform: translateY(0);
}

.theme-toggle {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 40px;
    padding: 8px 14px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text);
    transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
    font-family: var(--font);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.theme-toggle:hover {
    background: var(--surface-solid);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.mobile-menu-btn {
    display: none;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 8px 12px;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--text);
    line-height: 1;
    transition: background 0.25s ease, transform 0.25s ease;
}

.mobile-menu-btn:hover {
    background: var(--surface-solid);
    transform: scale(1.05);
}

.breadcrumb {
    padding: 18px 0 4px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 2px;
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: color 0.25s ease;
}

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

.breadcrumb span {
    margin: 0 6px;
}

.banner {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 20px 0 36px;
    background: linear-gradient(135deg, #0f4c81 0%, #1a3a5c 40%, #1e2b3a 100%);
    min-height: 300px;
    display: flex;
    align-items: center;
    color: #fff;
    box-shadow: 0 20px 60px rgba(15, 76, 129, 0.25);
    isolation: isolate;
}

.banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(232, 163, 61, 0.18) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(44, 110, 158, 0.3) 0%, transparent 50%);
    z-index: 0;
    pointer-events: none;
}

.banner::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(232, 163, 61, 0.12) 0%, transparent 70%);
    z-index: 0;
    pointer-events: none;
    animation: floatOrb 12s ease-in-out infinite;
}

@keyframes floatOrb {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-30px, 30px) scale(1.1); }
}

.banner-slide {
    display: none;
    padding: 52px 44px;
    width: 100%;
    position: relative;
    z-index: 1;
    animation: fadeIn 0.6s ease;
}

.banner-slide.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0.3; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.banner-slide h2 {
    font-size: 2.3rem;
    font-weight: 800;
    margin-bottom: 14px;
    line-height: 1.25;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.banner-slide p {
    font-size: 1.08rem;
    opacity: 0.92;
    max-width: 600px;
    margin-bottom: 24px;
    line-height: 1.7;
}

.banner-slide .btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #1e2b3a;
    padding: 13px 32px;
    border-radius: 40px;
    font-weight: 700;
    font-size: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(232, 163, 61, 0.35);
    position: relative;
    overflow: hidden;
}

.banner-slide .btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    transition: left 0.5s ease;
}

.banner-slide .btn:hover {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(232, 163, 61, 0.5);
    color: #1e2b3a;
}

.banner-slide .btn:hover::after {
    left: 100%;
}

.banner-nav {
    position: absolute;
    bottom: 20px;
    right: 28px;
    display: flex;
    gap: 10px;
    z-index: 2;
}

.banner-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease, width 0.3s ease;
    border: none;
    padding: 0;
}

.banner-dot:hover {
    background: rgba(255, 255, 255, 0.7);
}

.banner-dot.active {
    background: #fff;
    transform: scale(1.2);
    width: 28px;
    border-radius: 6px;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin: 36px 0 52px;
}

.stat-item {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-border);
    transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity 0.35s ease;
}

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

.stat-item:hover::before {
    opacity: 1;
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    letter-spacing: -1px;
    transition: color 0.3s ease;
}

body.dark .stat-number {
    color: var(--primary-light);
}

.stat-label {
    font-size: 0.93rem;
    color: var(--text-secondary);
    margin-top: 8px;
    font-weight: 500;
}

section {
    margin-bottom: 60px;
}

.section-title {
    font-size: 1.85rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text);
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
    padding-bottom: 6px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
    transition: width 0.4s ease;
}

section:hover .section-title::after {
    width: 80px;
}

.section-sub {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1rem;
    margin-top: 6px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    padding: 30px 26px;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-border);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, border-color 0.35s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(15, 76, 129, 0.03), rgba(232, 163, 61, 0.03));
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

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

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

.card h3 {
    font-size: 1.22rem;
    margin-bottom: 12px;
    color: var(--text);
    font-weight: 700;
    position: relative;
    transition: color 0.3s ease;
}

.card:hover h3 {
    color: var(--primary);
}

.card p {
    color: var(--text-secondary);
    font-size: 0.96rem;
    line-height: 1.75;
    position: relative;
}

.card p a {
    font-weight: 500;
    border-bottom: 1px dashed var(--primary);
    transition: border-color 0.25s ease, color 0.25s ease;
}

.card p a:hover {
    border-bottom-style: solid;
    color: var(--accent);
}

.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    padding: 26px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, border-color 0.35s ease;
    position: relative;
    overflow: hidden;
}

.article-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

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

.article-card:hover::after {
    transform: scaleX(1);
}

.article-card h4 {
    font-size: 1.12rem;
    margin-bottom: 10px;
    color: var(--text);
    font-weight: 700;
    line-height: 1.5;
    transition: color 0.3s ease;
}

.article-card:hover h4 {
    color: var(--primary);
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.article-card p {
    color: var(--text-secondary);
    font-size: 0.93rem;
    flex: 1;
    line-height: 1.75;
}

.read-more {
    margin-top: 16px;
    font-weight: 600;
    font-size: 0.93rem;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.3s ease, color 0.25s ease;
}

.read-more:hover {
    gap: 10px;
    color: var(--accent);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 20px rgba(15, 76, 129, 0.08);
}

.faq-item.open {
    border-color: var(--primary);
    box-shadow: 0 6px 24px rgba(15, 76, 129, 0.1);
}

.faq-question {
    padding: 18px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    transition: background 0.25s ease, color 0.25s ease;
    font-size: 1.02rem;
    color: var(--text);
    border: none;
    width: 100%;
    text-align: left;
    font-family: var(--font);
    gap: 16px;
}

.faq-question:hover {
    background: rgba(15, 76, 129, 0.04);
}

body.dark .faq-question:hover {
    background: rgba(74, 158, 222, 0.06);
}

.faq-answer {
    padding: 0 24px 22px;
    color: var(--text-secondary);
    display: none;
    font-size: 0.95rem;
    line-height: 1.85;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 0;
    animation: slideDown 0.35s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-icon {
    font-size: 1.3rem;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), color 0.3s ease;
    color: var(--primary);
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(15, 76, 129, 0.08);
}

body.dark .faq-icon {
    background: rgba(74, 158, 222, 0.12);
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
    background: var(--primary);
    color: #fff;
}

.howto-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    counter-reset: step;
}

.howto-step {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    padding: 26px 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
    position: relative;
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, border-color 0.35s ease;
    overflow: hidden;
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 16px;
    box-shadow: 0 4px 14px rgba(15, 76, 129, 0.25);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

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

.howto-step:hover::before {
    transform: scale(1.08) rotate(-4deg);
    box-shadow: 0 6px 20px rgba(15, 76, 129, 0.35);
}

.howto-step h4 {
    font-size: 1.08rem;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 700;
}

.howto-step p {
    color: var(--text-secondary);
    font-size: 0.93rem;
    line-height: 1.75;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.contact-item {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-radius: var(--radius);
    padding: 24px 22px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow);
    transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
    position: relative;
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary), var(--accent));
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.4s ease;
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

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

.contact-item h4 {
    font-size: 0.98rem;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 700;
}

.contact-item p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.7;
}

.site-footer {
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--glass-border);
    padding: 52px 0 28px;
    margin-top: 52px;
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
    background-size: 200% 100%;
    animation: gradientShift 6s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 36px;
    margin-bottom: 36px;
}

.footer-col h4 {
    font-size: 1.02rem;
    margin-bottom: 16px;
    color: var(--text);
    font-weight: 700;
    position: relative;
    padding-bottom: 8px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 28px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 10px;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.92rem;
    transition: color 0.25s ease, padding-left 0.25s ease;
    display: inline-block;
}

.footer-col a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 26px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    font-size: 0.86rem;
    color: var(--text-secondary);
}

.footer-bottom a {
    color: var(--text-secondary);
    transition: color 0.25s ease;
}

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

.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border: none;
    cursor: pointer;
    box-shadow: 0 6px 24px rgba(15, 76, 129, 0.4);
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease, transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 10px 32px rgba(15, 76, 129, 0.5);
}

.back-to-top:active {
    transform: translateY(-2px) scale(0.98);
}

.fade-up {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.mobile-nav {
    display: none;
    width: 100%;
    background: var(--glass-bg);
    -webkit-backdrop-filter: var(--glass-blur);
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--glass-border);
    padding: 12px 0;
    animation: slideDown 0.3s ease;
}

.mobile-nav.open {
    display: block;
}

.mobile-nav a {
    display: block;
    padding: 13px 24px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.98rem;
    transition: background 0.25s ease, color 0.25s ease, padding-left 0.25s ease;
}

.mobile-nav a:hover {
    background: rgba(15, 76, 129, 0.06);
    color: var(--primary);
    padding-left: 30px;
}

body.dark .mobile-nav a:hover {
    background: rgba(74, 158, 222, 0.08);
}

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

.mt-2 {
    margin-top: 16px;
}

.mb-2 {
    margin-bottom: 16px;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

::selection {
    background: rgba(15, 76, 129, 0.2);
    color: var(--text);
}

body.dark ::selection {
    background: rgba(74, 158, 222, 0.3);
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
    border-radius: 10px;
    border: 2px solid var(--bg);
}

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

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .header-inner {
        flex-wrap: nowrap;
    }

    .search-box input {
        width: 100px;
    }

    .banner-slide h2 {
        font-size: 1.9rem;
    }

    .section-title {
        font-size: 1.6rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 18px;
    }

    .banner-slide {
        padding: 36px 24px;
    }

    .banner-slide h2 {
        font-size: 1.5rem;
    }

    .banner-slide p {
        font-size: 0.98rem;
    }

    .banner-slide .btn {
        padding: 11px 26px;
        font-size: 0.95rem;
    }

    .search-box {
        display: none;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .stat-number {
        font-size: 1.9rem;
    }

    .stat-item {
        padding: 22px 12px;
    }

    .card {
        padding: 24px 20px;
    }

    .article-card {
        padding: 22px 20px;
    }

    .faq-question {
        padding: 16px 18px;
        font-size: 0.97rem;
    }

    .faq-answer {
        padding: 14px 18px 18px;
        font-size: 0.92rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }

    .banner-nav {
        bottom: 14px;
        right: 18px;
    }

    .banner-dot.active {
        width: 22px;
    }
}

@media (max-width: 380px) {
    .logo span {
        font-size: 1.1rem;
    }

    .logo svg {
        width: 34px;
        height: 34px;
    }

    .theme-toggle span:last-child {
        display: none;
    }

    .banner-slide h2 {
        font-size: 1.3rem;
    }
}

@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;
    }

    .fade-up {
        opacity: 1;
        transform: none;
    }
}

@media print {
    .site-header,
    .back-to-top,
    .banner-nav,
    .mobile-nav,
    .theme-toggle,
    .search-box {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .card,
    .article-card,
    .faq-item,
    .howto-step,
    .contact-item {
        box-shadow: none;
        border: 1px solid #ccc;
        background: #fff;
    }
}