/* ========== CSS Variables ========== */
:root {
    --c-primary: #1E40AF;
    --c-primary-light: #3B82F6;
    --c-accent: #D97706;
    --c-accent-light: #FEF3C7;
    --c-text-dark: #0F172A;
    --c-text-medium: #475569;
    --c-text-light: #64748B;
    --c-text-muted: #94A3B8;
    --c-bg-light: #F8FAFC;
    --c-bg-white: #FFFFFF;
    --c-bg-dark: #1E3A8A;
    --c-bg-footer: #0F172A;
    --c-border: #E2E8F0;
    --c-blue-bg: #EFF6FF;

    --font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

    --container: 1200px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(6,15,43,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --transition: all 0.3s ease;
}

/* ========== Reset & Base ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font);
    color: var(--c-text-medium);
    background: var(--c-bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img, svg { display: block; max-width: 100%; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}
.btn-sm { padding: 10px 24px; font-size: 14px; }
.btn-primary {
    background: var(--c-primary);
    color: #fff;
}
.btn-primary:hover {
    background: #1A3590;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(30,64,175,0.3);
}
.btn-outline {
    background: #fff;
    color: var(--c-primary);
    border: 1.5px solid var(--c-primary);
}
.btn-outline:hover {
    background: var(--c-blue-bg);
}

/* ========== Header ========== */
#header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
#header.scrolled {
    box-shadow: 0 2px 16px rgba(0,0,0,0.06);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo-icon { width: 28px; height: 28px; }
.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--c-text-dark);
}
.nav {
    display: flex;
    gap: 36px;
}
.nav-link {
    font-size: 15px;
    color: var(--c-text-light);
    transition: var(--transition);
    position: relative;
}
.nav-link:hover, .nav-link.active {
    color: var(--c-primary);
    font-weight: 600;
}
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -6px; left: 50%;
    transform: translateX(-50%);
    width: 20px; height: 2px;
    background: var(--c-primary);
    border-radius: 2px;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}
.header-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--c-text-medium);
}
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.menu-toggle span {
    width: 22px; height: 2px;
    background: var(--c-text-dark);
    border-radius: 2px;
    transition: var(--transition);
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ========== Hero ========== */
.hero {
    padding-top: 64px;
    background: var(--c-bg-light);
}
.hero-inner {
    display: flex;
    align-items: center;
    gap: 60px;
    padding: 60px 24px 80px;
}
.hero-content { flex: 0 0 580px; }
.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--c-blue-bg);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--c-primary);
    margin-bottom: 28px;
}
.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--c-text-dark);
    line-height: 1.25;
    margin-bottom: 20px;
}
.hero-subtitle {
    font-size: 17px;
    line-height: 1.65;
    color: var(--c-text-light);
    margin-bottom: 32px;
}
.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}
.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--c-primary);
}
.stat-label {
    font-size: 14px;
    color: var(--c-text-light);
}
.stat-divider {
    width: 1px; height: 40px;
    background: var(--c-border);
}

/* Hero Visual */
.hero-visual {
    flex: 1;
    min-height: 460px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #1E40AF 0%, #3B82F6 100%);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-icon-wrap {
    z-index: 2;
    opacity: 0.15;
    transform: scale(2.5);
}
.float-card {
    position: absolute;
    background: rgba(255,255,255,0.95);
    border-radius: var(--radius-md);
    padding: 16px 24px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 3;
    animation: floatAnim 4s ease-in-out infinite;
}
.float-card .fc-label {
    font-size: 12px;
    color: var(--c-text-light);
    font-weight: 500;
}
.float-card .fc-score {
    font-size: 24px;
    font-weight: 700;
    color: var(--c-primary);
}
.card-1 { top: 12%; left: 8%; }
.card-2 { top: 18%; right: 10%; animation-delay: 0.5s; }
.card-3 { bottom: 18%; left: 12%; animation-delay: 1s; }
.card-4 { bottom: 14%; right: 8%; animation-delay: 1.5s; }
@keyframes floatAnim {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
.deco {
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
}
.deco-1 { width: 200px; height: 200px; top: -60px; right: -40px; }
.deco-2 { width: 120px; height: 120px; bottom: -30px; left: -20px; }

/* ========== Section Header ========== */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 12px;
}
.section-subtitle {
    font-size: 16px;
    color: var(--c-text-light);
}
.title-light { color: #fff; }
.subtitle-light { color: #B4C6E0; }

/* ========== Courses ========== */
.courses {
    padding: 80px 0;
    background: #fff;
}
.courses-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.course-card {
    background: #fff;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}
.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}
.card-topbar { height: 6px; }
.bar-blue { background: var(--c-primary-light); }
.bar-amber { background: var(--c-accent); }
.card-body { padding: 28px; }
.course-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 14px;
}
.course-price {
    font-size: 26px;
    font-weight: 700;
    color: var(--c-accent);
    margin-bottom: 6px;
}
.price-unit { font-size: 16px; font-weight: 400; }
.course-duration {
    font-size: 14px;
    color: var(--c-text-light);
    margin-bottom: 16px;
}
.course-features {
    margin-bottom: 20px;
}
.course-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--c-text-medium);
    padding: 4px 0;
}
.check-icon {
    width: 18px; height: 18px;
    flex-shrink: 0;
}
.course-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--c-primary);
    transition: var(--transition);
}
.course-link:hover { opacity: 0.8; }

/* ========== About ========== */
.about {
    padding: 80px 0;
    background: var(--c-bg-light);
}
.about-content {
    display: flex;
    gap: 60px;
    align-items: center;
}
.about-text {
    flex: 0 0 520px;
}
.about-text p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--c-text-medium);
    margin-bottom: 20px;
}
.about-stats {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.stat-box {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(6,15,43,0.06);
    transition: var(--transition);
}
.stat-box:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.sb-value {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--c-primary);
    margin-bottom: 8px;
}
.sb-label {
    font-size: 14px;
    color: var(--c-text-light);
}

/* ========== Service ========== */
.service {
    padding: 80px 0;
    background: var(--c-bg-dark);
}
.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.service-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}
.service-card:hover {
    transform: translateY(-4px);
}
.service-icon {
    width: 48px; height: 48px;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.icon-blue { background: var(--c-blue-bg); }
.icon-amber { background: var(--c-accent-light); }
.service-card-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 12px;
}
.service-card-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--c-text-medium);
}

/* ========== Contact ========== */
.contact {
    padding: 80px 0;
    background: var(--c-bg-light);
}
.contact-content {
    display: flex;
    gap: 40px;
    align-items: center;
}
.contact-info { flex: 1; }
.contact-company {
    font-size: 22px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 20px;
}
.contact-item {
    font-size: 15px;
    line-height: 1.6;
    color: var(--c-text-medium);
    margin-bottom: 16px;
}
.contact-link {
    color: var(--c-primary);
    transition: var(--transition);
}
.contact-link:hover { text-decoration: underline; }
.contact-map {
    flex: 0 0 400px;
    height: 280px;
    background: var(--c-primary);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: var(--transition);
}
.contact-map:hover {
    background: #1A3590;
}
.map-text {
    font-size: 16px;
    font-weight: 500;
    color: #fff;
}
.map-subtext {
    font-size: 13px;
    color: #B4C6E0;
}

/* ========== Footer ========== */
.footer {
    padding: 60px 0 40px;
    background: var(--c-bg-footer);
}
.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}
.footer-left {}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.footer-logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
}
.footer-tagline {
    font-size: 14px;
    color: var(--c-text-muted);
    margin-bottom: 4px;
}
.footer-company {
    font-size: 14px;
    color: var(--c-text-muted);
}
.footer-links {
    display: flex;
    gap: 32px;
}
.footer-link {
    font-size: 14px;
    color: var(--c-text-muted);
    transition: var(--transition);
}
.footer-link:hover { color: #fff; }
.footer-divider {
    width: 100%;
    height: 1px;
    background: #1E293B;
    margin-bottom: 24px;
}
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.footer-copyright {
    font-size: 13px;
    color: var(--c-text-muted);
}
.footer-icp {
    font-size: 13px;
    color: var(--c-text-muted);
    transition: var(--transition);
}
.footer-icp:hover { color: #fff; }

/* ========== Reveal Animation ========== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ========== Page Banner (Courses Page) ========== */
.page-banner {
    padding-top: 64px;
    background: linear-gradient(135deg, #1E40AF 0%, #3B82F6 100%);
    color: #fff;
    padding-bottom: 56px;
    position: relative;
    overflow: hidden;
}
.page-banner::before {
    content: '';
    position: absolute;
    top: -60px; right: -40px;
    width: 200px; height: 200px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
}
.page-banner::after {
    content: '';
    position: absolute;
    bottom: -30px; left: -20px;
    width: 120px; height: 120px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
}
.page-banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding-top: 40px;
}
.page-title {
    font-size: 40px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}
.page-subtitle {
    font-size: 17px;
    color: #B4C6E0;
    margin-bottom: 28px;
}
.page-banner-tags {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.banner-tag {
    padding: 8px 20px;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: #fff;
    backdrop-filter: blur(4px);
}

/* ========== Course Detail (Courses Page) ========== */
.course-detail {
    padding: 60px 0;
    background: #fff;
}
.course-detail-alt {
    background: var(--c-bg-light);
}
.course-detail-card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
}
.course-detail-alt .course-detail-card {
    box-shadow: 0 4px 12px rgba(6,15,43,0.06);
}
.course-detail-header {
    padding: 36px 40px 28px;
    border-bottom: 1px solid var(--c-border);
    text-align: center;
}
.course-detail-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}
.badge-blue {
    background: var(--c-blue-bg);
    color: var(--c-primary);
}
.badge-amber {
    background: var(--c-accent-light);
    color: var(--c-accent);
}
.course-detail-name {
    font-size: 28px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 12px;
}
.course-detail-price {
    font-size: 32px;
    font-weight: 700;
    color: var(--c-accent);
}
.course-detail-body {
    padding: 36px 40px;
}
.course-detail-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 36px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--c-border);
}
.info-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.info-label {
    font-size: 13px;
    color: var(--c-text-muted);
}
.info-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--c-text-dark);
}
.course-detail-features {
    margin-bottom: 36px;
}
.features-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 20px;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--c-text-medium);
}
.check-icon-lg {
    width: 20px; height: 20px;
    flex-shrink: 0;
}
.course-detail-action {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* ========== Policy Section (Courses Page) ========== */
.policy-section {
    padding: 80px 0;
    background: #fff;
}
.policy-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.policy-card {
    background: var(--c-bg-light);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}
.policy-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.policy-icon {
    width: 56px; height: 56px;
    border-radius: 28px;
    background: var(--c-blue-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}
.policy-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--c-text-dark);
    margin-bottom: 12px;
}
.policy-desc {
    font-size: 14px;
    line-height: 1.7;
    color: var(--c-text-medium);
}

/* ========== Responsive: Tablet ========== */
@media (max-width: 1024px) {
    .hero-inner {
        flex-direction: column;
        padding: 40px 24px 60px;
    }
    .hero-content { flex: none; width: 100%; }
    .hero-visual { width: 100%; min-height: 360px; }
    .hero-title { font-size: 36px; }
    .courses-grid { grid-template-columns: repeat(2, 1fr); }
    .about-content { flex-direction: column; }
    .about-text { flex: none; width: 100%; }
    .service-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
    .contact-content { flex-direction: column; }
    .contact-map { flex: none; width: 100%; }
    .policy-grid { grid-template-columns: repeat(2, 1fr); }
    .course-detail-info { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
}

/* ========== Responsive: Mobile ========== */
@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .nav {
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: #fff;
        flex-direction: column;
        gap: 0;
        padding: 0;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }
    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .nav-link {
        padding: 16px 24px;
        border-bottom: 1px solid var(--c-border);
    }
    .nav-link.active::after { display: none; }
    .menu-toggle { display: flex; }
    .header-phone { display: none; }
    .btn-sm { display: none; }

    .hero-title { font-size: 28px; line-height: 1.3; }
    .hero-subtitle { font-size: 15px; }
    .hero-cta { flex-direction: column; gap: 12px; }
    .btn { width: 100%; }
    .hero-stats { gap: 20px; }
    .stat-value { font-size: 22px; }

    .courses-grid { grid-template-columns: 1fr; }
    .about-stats { grid-template-columns: 1fr 1fr; gap: 16px; }
    .stat-box { padding: 20px; }
    .sb-value { font-size: 26px; }

    .section-title { font-size: 26px; }
    .section-subtitle { font-size: 14px; }

    .footer-top { flex-direction: column; gap: 24px; text-align: center; }
    .footer-links { flex-wrap: wrap; justify-content: center; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

    .float-card { padding: 10px 16px; }
    .float-card .fc-score { font-size: 18px; }
    .card-1 { top: 8%; left: 5%; }
    .card-2 { top: 14%; right: 5%; }
    .card-3 { bottom: 14%; left: 8%; }
    .card-4 { bottom: 10%; right: 5%; }

    .page-title { font-size: 28px; }
    .page-subtitle { font-size: 14px; }
    .page-banner-tags { gap: 8px; }
    .banner-tag { padding: 6px 14px; font-size: 12px; }

    .course-detail-header { padding: 24px 20px 20px; }
    .course-detail-name { font-size: 22px; }
    .course-detail-price { font-size: 26px; }
    .course-detail-body { padding: 24px 20px; }
    .course-detail-info { grid-template-columns: 1fr; gap: 16px; }
    .features-grid { grid-template-columns: 1fr; }
    .course-detail-action { flex-direction: column; }

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