/* =============================================
   全局 Reset & 变量
   ============================================= */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary: #0F2027;
    --primary-mid: #203A43;
    --primary-light: #2C5364;
    --accent: #FEE500;
    --accent-dark: #E6CF00;
    --text-main: #1A1A2E;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    --bg-page: #F9FAFB;
    --bg-white: #FFFFFF;
    --bg-card: #FFFFFF;
    --border: #E5E7EB;
    --success: #10B981;
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 6px 20px rgba(0,0,0,0.10);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.14);
}

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

body {
    font-family: 'IBM Plex Sans KR', -apple-system, BlinkMacSystemFont, 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background: var(--bg-page);
    overflow-x: hidden;
    /* 底部固定按钮留白 */
    padding-bottom: 80px;
}

.container {
    width: 100%;
    max-width: 480px;     /* 手机优先，最大宽度限制 */
    margin: 0 auto;
    padding: 0 18px;
}

/* 大屏适配 */
@media (min-width: 768px) {
    .container { max-width: 720px; }
    body { padding-bottom: 0; }
}
@media (min-width: 1200px) {
    .container { max-width: 1100px; }
}

/* =============================================
   顶部教育横幅
   ============================================= */
.edu-banner {
    background: var(--primary);
    color: rgba(255,255,255,0.82);
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.edu-banner .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-align: center;
}

.edu-banner i {
    font-size: 0.85rem;
    color: var(--accent);
    flex-shrink: 0;
}

.edu-banner span {
    font-size: 0.75rem;
    line-height: 1.4;
}

/* =============================================
   Hero — 全屏渐变 + 文字居中
   ============================================= */
.hero {
    position: relative;
    min-height: 100svh;
    display: flex;
    align-items: center;
    padding: 60px 0 50px;
    background: linear-gradient(160deg, var(--primary) 0%, var(--primary-mid) 50%, var(--primary-light) 100%);
    overflow: hidden;
}

/* 装饰光圈 */
.hero::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(254,229,0,0.12) 0%, transparent 70%);
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -80px;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(44,83,100,0.6) 0%, transparent 70%);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: url(../imgs/bgc.png) no-repeat center center / cover;
    opacity: 0.06;
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
    text-align: center;
}

/* 徽章 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(254,229,0,0.15);
    border: 1px solid rgba(254,229,0,0.35);
    color: var(--accent);
    padding: 7px 18px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: #FFFFFF;
    line-height: 1.18;
    letter-spacing: -0.02em;
}

.hero-title em {
    font-style: normal;
    color: var(--accent);
}

.hero-subtitle {
    font-size: 1rem;
    color: rgba(255,255,255,0.78);
    line-height: 1.75;
    max-width: 340px;
}

/* 3特性标签 */
.hero-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 340px;
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-sm);
    padding: 11px 16px;
    font-size: 0.88rem;
    color: rgba(255,255,255,0.92);
    text-align: left;
}

.hero-feature-item i {
    color: var(--accent);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* Hero 学习统计卡 */
.hero-ticker {
    width: 100%;
    max-width: 340px;
    background: rgba(255,255,255,0.10);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: var(--radius-md);
    padding: 20px;
}

.ticker-header {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid rgba(255,255,255,0.12);
}

.ticker-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ticker-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.ticker-label {
    font-size: 0.78rem;
    color: rgba(255,255,255,0.6);
    font-weight: 500;
}

.ticker-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
}

.ticker-change {
    font-size: 0.72rem;
    color: var(--success);
    font-weight: 500;
}

.ticker-disclaimer {
    margin-top: 14px;
    font-size: 0.68rem;
    color: rgba(255,255,255,0.4);
    text-align: center;
}

/* Hero CTA */
.hero-cta-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100%;
    max-width: 340px;
}

.cta-button {
    width: 100%;
    background: var(--accent);
    color: #000;
    border: none;
    padding: 17px 24px;
    font-size: 1.05rem;
    font-weight: 800;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: inherit;
    box-shadow: 0 6px 24px rgba(254,229,0,0.45);
    transition: transform 0.18s, box-shadow 0.18s, background 0.18s;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.cta-button:active {
    transform: scale(0.97);
    box-shadow: 0 3px 12px rgba(254,229,0,0.3);
}

.cta-button:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(254,229,0,0.55);
}

.btn-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    flex-shrink: 0;
}

.btn-text { font-weight: 800; }

.hero-note {
    font-size: 0.72rem;
    color: rgba(255,255,255,0.45);
    text-align: center;
    line-height: 1.5;
}

/* =============================================
   统计数字横条
   ============================================= */
.stats-section {
    background: var(--accent);
    padding: 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
}

.stat-item {
    padding: 22px 10px;
    text-align: center;
    border-right: 1px solid rgba(0,0,0,0.08);
    border-bottom: 1px solid rgba(0,0,0,0.08);
}

.stat-item:nth-child(2n) { border-right: none; }
.stat-item:nth-last-child(-n+2) { border-bottom: none; }

.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.75rem;
    color: rgba(0,0,0,0.6);
    font-weight: 500;
}

/* =============================================
   功能特色 — 卡片纵向堆叠
   ============================================= */
.features {
    padding: 52px 0;
    background: var(--bg-page);
}

.section-title {
    text-align: center;
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 8px;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.section-title::after {
    content: '';
    display: block;
    width: 44px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
    margin: 12px auto 36px;
}

.section-subtitle {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-top: -28px;
    margin-bottom: 30px;
}

/* 卡片堆叠模式（原 feature-item） */
.feature-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: 20px;
    border: 1px solid var(--border);
}

.feature-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.feature-text {
    padding: 22px 20px 24px;
}

.feature-icon {
    width: 46px;
    height: 46px;
    background: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.feature-icon i {
    font-size: 1.25rem;
    color: var(--accent);
}

.feature-text h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
    line-height: 1.35;
}

.feature-text > p {
    font-size: 0.88rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 6px;
}

.feature-note {
    font-size: 0.78rem !important;
    color: var(--text-light) !important;
    font-weight: 400 !important;
    margin-bottom: 14px !important;
    font-style: italic;
}

.feature-text ul {
    list-style: none;
    margin-top: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-text ul li {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    font-size: 0.88rem;
    color: var(--text-main);
    line-height: 1.5;
}

.feature-text ul li i {
    color: var(--success);
    font-size: 0.8rem;
    margin-top: 3px;
    flex-shrink: 0;
}

/* 桌面端恢复左右布局 */
@media (min-width: 768px) {
    .feature-item {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
    .feature-item .feature-image {
        height: 100%;
        min-height: 260px;
    }
    .feature-item.reverse .feature-image {
        order: 2;
    }
    .feature-item.reverse .feature-text {
        order: 1;
    }
}

/* =============================================
   会员评价 — 横向滑动卡片
   ============================================= */
.testimonials {
    padding: 52px 0;
    background: var(--bg-white);
}

.testimonial-scroll {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    padding: 4px 18px 16px;
    margin: 0 -18px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.testimonial-scroll::-webkit-scrollbar { display: none; }

.testimonial-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    background: var(--bg-page);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px 18px;
}

.testimonial-avatar {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.testimonial-avatar i {
    font-size: 2.2rem;
    color: var(--primary-light);
}

.testimonial-author {
    font-size: 0.82rem;
    color: var(--text-gray);
    font-weight: 600;
}

.testimonial-content p {
    font-size: 0.88rem;
    line-height: 1.75;
    color: var(--text-main);
    position: relative;
}

.testimonial-content p::before {
    content: '"';
    font-size: 2rem;
    color: var(--accent);
    line-height: 0;
    vertical-align: -0.4em;
    margin-right: 2px;
    font-weight: 900;
}

/* 桌面端变回 grid */
@media (min-width: 768px) {
    .testimonial-scroll {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        overflow-x: visible;
        padding: 4px 0 0;
        margin: 0;
    }
    .testimonial-card { flex: unset; }
}

/* =============================================
   学习日程 — 时间轴样式
   ============================================= */
.schedule {
    padding: 52px 0;
    background: var(--bg-page);
}

.schedule-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.schedule-grid::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), transparent);
}

.schedule-card {
    display: flex;
    gap: 20px;
    padding: 18px 0 18px 0;
    position: relative;
}

/* 时间轴圆点 */
.schedule-card::before {
    content: '';
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-page);
    box-shadow: 0 0 0 3px rgba(254,229,0,0.3);
    flex-shrink: 0;
    margin-top: 4px;
    margin-left: 22px;
    z-index: 1;
}

.schedule-body {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px 18px;
    flex: 1;
    box-shadow: var(--shadow-sm);
}

.schedule-day {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.schedule-time {
    font-size: 0.82rem;
    color: var(--text-gray);
    margin-bottom: 8px;
}

.schedule-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
}

.schedule-desc {
    font-size: 0.82rem;
    color: var(--text-gray);
    line-height: 1.55;
}

@media (min-width: 768px) {
    .schedule-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .schedule-grid::before { display: none; }
    .schedule-card {
        display: block;
        padding: 0;
    }
    .schedule-card::before { display: none; }
    .schedule-body { height: 100%; }
}

/* =============================================
   FAQ — 折叠手风琴
   ============================================= */
.faq {
    padding: 52px 0;
    background: var(--bg-white);
}

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

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

.faq-item.active {
    border-color: var(--primary-light);
}

.faq-question {
    padding: 18px 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-main);
    user-select: none;
}

.faq-question span { flex: 1; }

.faq-question i {
    color: var(--primary-light);
    font-size: 0.8rem;
    transition: transform 0.28s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-question i {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.faq-item.active .faq-answer {
    max-height: 400px;
}

.faq-answer p {
    padding: 0 18px 18px;
    font-size: 0.88rem;
    color: var(--text-gray);
    line-height: 1.75;
    border-top: 1px solid var(--border);
    padding-top: 14px;
}

/* =============================================
   Footer
   ============================================= */
.footer {
    background: var(--primary);
    color: rgba(255,255,255,0.82);
    padding: 40px 0 28px;
}

.footer-grid {
    display: flex;
    flex-direction: column;
    gap: 28px;
    margin-bottom: 28px;
}

.footer-section h3 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.footer-section p {
    font-size: 0.8rem;
    line-height: 1.7;
    margin-bottom: 10px;
    opacity: 0.82;
}

.footer-section ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.footer-section ul li {
    font-size: 0.78rem;
    opacity: 0.72;
    padding-left: 12px;
    position: relative;
    line-height: 1.5;
}

.footer-section ul li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.footer-small {
    font-size: 0.75rem !important;
    opacity: 0.55 !important;
    margin-top: 8px !important;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.78rem;
    opacity: 0.65;
    margin-bottom: 8px;
    line-height: 1.6;
}

.footer-warning {
    font-size: 0.75rem !important;
    color: rgba(255,255,255,0.5) !important;
    opacity: 1 !important;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

@media (min-width: 768px) {
    .footer-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }
}

/* =============================================
   固定底部 CTA（手机版主要触达入口）
   ============================================= */
.fixed-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    background: linear-gradient(to top, rgba(15,32,39,0.96) 60%, transparent);
    padding: 14px 18px 18px;
    pointer-events: none;
}

.fixed-cta .cta-button {
    pointer-events: auto;
    max-width: 420px;
    margin: 0 auto;
    display: flex;
    box-shadow: 0 8px 28px rgba(254,229,0,0.5);
    font-size: 1rem;
    padding: 16px 20px;
}

/* 桌面端隐藏底部固定条 */
@media (min-width: 768px) {
    .fixed-cta { display: none; }
    body { padding-bottom: 0; }
}

/* =============================================
   占位符图片（无图时降级）
   ============================================= */
.placeholder-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #E5E7EB 0%, #D1D5DB 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-image i {
    font-size: 3rem;
    color: #9CA3AF;
}