/* ============================================================
   楚风魔方 - 官方网站样式表
   Chufeng Cube Official Website Styles
   ============================================================ */

/* ==================== CSS Custom Properties ==================== */
:root {
    --color-primary: #c40000;
    --color-primary-dark: #a00000;
    --color-text: #333;
    --color-text-gray: #666;
    --color-text-light: #999;
    --color-bg: #fff;
    --color-bg-light: #fafafa;
    --color-bg-gray: #f6f6f6;
    --color-bg-section: #f7f7f7;
    --color-footer: #172950;
    --color-footer-text: #eee;
    --gradient-footer: linear-gradient(to bottom, #304f9e, #447fbf);
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-qrcode: 0 2px 10px rgba(0, 0, 0, 0.1);
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --transition-default: transform 0.3s ease, box-shadow 0.3s ease;
    --max-width: 1200px;
    --header-height: 72px;
    --header-height-mobile: 56px;
}

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

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-width: 320px;
    overflow-x: hidden;
}

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

ul, ol {
    list-style: none;
}

a {
    text-decoration: none;
    color: inherit;
    -webkit-tap-highlight-color: transparent;
}

/* ==================== Layout Utilities ==================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

section {
    padding: 60px 0;
}

.section-title-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    flex-wrap: nowrap;
}

.section-title-wrap img {
    flex-shrink: 0;
    width: auto;
    height: 28px;
}

.section-desc {
    text-align: center;
    color: var(--color-text-gray);
    line-height: 1.8;
    margin-bottom: 32px;
    font-size: 15px;
    padding: 0 8px;
}

.container-image {
    display: block;
    margin: 0 auto;
}

/* ==================== Fixed QR Code ==================== */
.fixed-qrcode {
    position: fixed;
    right: 5px;
    bottom: 50%;
    transform: translateY(50%);
    z-index: 1000;
    background: var(--color-bg);
    padding: 8px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-qrcode);
    text-align: center;
    font-size: 12px;
    transition: opacity 0.3s ease;
}

.fixed-qrcode img {
    width: 100px;
    height: auto;
}

/* ==================== Header ==================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 999;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    height: var(--header-height);
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-logo img {
    height: 42px;
}

/* -- Desktop Navigation -- */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    gap: 28px;
    font-size: 15px;
}

.nav-menu a {
    color: var(--color-text);
    transition: color 0.2s ease;
}

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

.nav-menu a.active {
    color: var(--color-primary);
    font-weight: 700;
}

/* -- Hamburger Button -- */
.menu-toggle {
    display: none;
    font-size: 26px;
    cursor: pointer;
    user-select: none;
    padding: 8px;
    line-height: 1;
}

/* ==================== Hero Section ==================== */
.section-hero {
    width: 100%;
    padding: 0;
    margin-top: var(--header-height);
}

.section-hero .hero-image {
    width: 100%;
    height: auto;
    min-height: 200px;
    object-fit: cover;
    object-position: center;
}

/* ==================== Cube Benefits Grid ==================== */
.cube-benefits {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.benefit-card {
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    text-align: center;
    transition: var(--transition-default);
}

@media (hover: hover) {
    .benefit-card:hover {
        transform: scale(1.05);
        box-shadow: var(--shadow-lg);
        z-index: 1;
    }
}

.benefit-card img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 50%;
    margin: 0 auto 12px;
}

.benefit-card h3 {
    margin: 12px 0;
    font-size: 18px;
}

.benefit-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-gray);
}

/* ==================== Card Grids (Teachers / Students / Events) ==================== */
.teacher-list,
.star-list,
.event-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.teacher-card,
.star-card,
.event-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition-default);
}

.teacher-card > img,
.star-card > img {
    width: 160px;
    height: 160px;
    object-fit: cover;
    border-radius: 50%;
    margin: 0 auto 16px;
}

.teacher-card {
    margin: 24px 0;
}

@media (hover: hover) {
    .teacher-card:hover,
    .star-card:hover,
    .event-card:hover {
        transform: scale(1.05);
        box-shadow: var(--shadow-lg);
        z-index: 1;
    }
}

.teacher-card h3,
.star-card h3 {
    margin: 12px 0;
    font-size: 16px;
}

.teacher-card p,
.star-card p {
    font-size: 14px;
    color: var(--color-text-gray);
    line-height: 1.6;
    text-align: left;
}

/* ==================== Course Modes ==================== */
.mode-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}

.mode-card {
    background: var(--color-bg-gray);
    padding: 24px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition-default);
}

@media (hover: hover) {
    .mode-card:hover {
        transform: scale(1.05);
        box-shadow: var(--shadow-lg);
        z-index: 1;
    }
}

.mode-card img {
    width: 40px;
    height: 40px;
    margin: 0 auto 10px;
}

.mode-card span {
    display: block;
}

/* ==================== Gallery ==================== */
.gallery-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.gallery-card {
    transition: var(--transition-default);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

@media (hover: hover) {
    .gallery-card:hover {
        transform: scale(1.05);
        box-shadow: var(--shadow-lg);
        z-index: 1;
    }
}

.gallery-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

/* ==================== Review Marquee ==================== */
.review-section {
    padding: 80px 0;
    background: var(--color-bg-section);
}

.review-marquee {
    width: calc(260px * 4 + 24px * 3);
    margin: 0 auto;
    overflow: hidden;
}

.review-track {
    display: flex;
    width: max-content;
    animation: review-scroll 35s linear infinite;
}

.review-marquee:hover .review-track {
    animation-play-state: paused;
}

.review-panel {
    display: grid;
    grid-template-columns: repeat(4, 260px);
    gap: 24px;
    margin-right: 24px;
}

.review-item img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    display: block;
}

@keyframes review-scroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ==================== Footer ==================== */
.site-footer {
    background: var(--gradient-footer);
    color: var(--color-footer-text);
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr;
    gap: 16px;
    padding: 24px 16px;
    align-items: center;
}

.footer-container img {
    max-width: 100%;
}

.footer-container p {
    font-size: 14px;
    line-height: 1.8;
}

.footer-copy {
    text-align: center;
    padding: 14px 0;
    background: var(--color-footer);
    font-size: 13px;
}

/* ============================================================
   Responsive - Tablet & Small Desktop (≤1024px)
   ============================================================ */
@media (max-width: 1024px) {
    .cube-benefits {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .mode-list {
        grid-template-columns: repeat(4, 1fr);
        gap: 12px;
    }

    .review-marquee {
        width: calc(220px * 4 + 16px * 3);
    }

    .review-panel {
        grid-template-columns: repeat(4, 220px);
        gap: 16px;
        margin-right: 16px;
    }
}

/* ============================================================
   Responsive - Tablet (≤768px)
   ============================================================ */
@media (max-width: 768px) {
    section {
        padding: 40px 0;
    }

    .container {
        padding: 0 16px;
    }

    .section-title-wrap {
        font-size: 20px;
        gap: 8px;
    }

    .section-title-wrap img {
        height: 20px;
    }

    .section-desc {
        font-size: 14px;
        margin-bottom: 24px;
    }

    /* Header */
    .site-header {
        height: var(--header-height-mobile);
    }

    .header-inner {
        height: var(--header-height-mobile);
    }

    .site-logo img {
        height: 32px;
    }

    .menu-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        position: fixed;
        top: var(--header-height-mobile);
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
        padding: 8px 0;
    }

    .nav-menu li {
        border-bottom: 1px solid #eee;
    }

    .nav-menu a {
        display: block;
        padding: 16px 24px;
        font-size: 16px;
    }

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

    /* Hero */
    .section-hero {
        margin-top: var(--header-height-mobile);
    }

    /* Grids → 2 columns */
    .cube-benefits {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .teacher-list,
    .star-list,
    .event-list {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .mode-list {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .gallery-list {
        grid-template-columns: 1fr 1fr;
    }

    /* Cards */
    .benefit-card {
        padding: 20px 14px;
    }

    .benefit-card img {
        width: 64px;
        height: 64px;
    }

    .benefit-card h3 {
        font-size: 16px;
    }

    .benefit-card p {
        font-size: 13px;
    }

    .teacher-card > img,
    .star-card > img {
        width: 120px;
        height: 120px;
    }

    .teacher-card {
        margin: 12px 0;
    }

    .teacher-card h3,
    .star-card h3 {
        font-size: 15px;
    }

    .teacher-card p,
    .star-card p {
        font-size: 13px;
    }

    .gallery-card img {
        height: 150px;
    }

    /* Review Marquee */
    .review-section {
        padding: 50px 0;
    }

    .review-marquee {
        width: calc(180px * 2 + 12px);
    }

    .review-panel {
        grid-template-columns: repeat(2, 180px);
        gap: 12px;
        margin-right: 12px;
    }

    .review-item img {
        height: 120px;
    }

    .review-track {
        animation-duration: 20s;
    }

    /* QR code */
    .fixed-qrcode {
        right: 2px;
        padding: 6px;
    }

    .fixed-qrcode img {
        width: 80px;
    }

    .fixed-qrcode p {
        font-size: 10px;
    }

    /* Footer */
    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 20px;
    }

    .footer-container > div:first-child img {
        max-width: 200px;
        margin: 0 auto;
    }

    .footer-container > div:last-child img {
        max-width: 80px;
        margin: 0 auto;
    }

    .site-footer .container {
        padding: 0 16px;
    }
}

/* ============================================================
   Responsive - Mobile (≤480px)
   ============================================================ */
@media (max-width: 480px) {
    section {
        padding: 32px 0;
    }

    .container {
        padding: 0 12px;
    }

    .section-title-wrap {
        font-size: 18px;
        gap: 6px;
        margin-bottom: 16px;
    }

    .section-title-wrap img {
        height: 16px;
    }

    .section-desc {
        font-size: 13px;
    }

    /* Single column grids */
    .cube-benefits,
    .teacher-list,
    .star-list,
    .event-list,
    .mode-list,
    .gallery-list {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    /* Benefit cards: side-by-side layout */
    .benefit-card {
        display: flex;
        align-items: center;
        text-align: left;
        gap: 14px;
        padding: 16px;
    }

    .benefit-card img {
        width: 52px;
        height: 52px;
        flex-shrink: 0;
        margin: 0;
    }

    .benefit-card h3 {
        margin: 0 0 4px;
        font-size: 15px;
    }

    .benefit-card p {
        font-size: 13px;
    }

    /* Teacher & Star cards */
    .teacher-card,
    .star-card {
        padding: 16px;
    }

    .teacher-card > img,
    .star-card > img {
        width: 100px;
        height: 100px;
    }

    .teacher-card {
        margin: 8px 0;
    }

    /* Mode cards */
    .mode-card {
        padding: 18px 14px;
        font-size: 15px;
    }

    .mode-card img {
        width: 36px;
        height: 36px;
    }

    /* Gallery */
    .gallery-card img {
        height: 220px;
    }

    /* Review Marquee */
    .review-section {
        padding: 40px 0;
    }

    .review-marquee {
        width: calc(150px * 2 + 10px);
    }

    .review-panel {
        grid-template-columns: repeat(2, 150px);
        gap: 10px;
        margin-right: 10px;
    }

    .review-item img {
        height: 100px;
        border-radius: var(--radius-sm);
    }

    .review-track {
        animation-duration: 16s;
    }

    /* Header */
    .site-logo img {
        height: 28px;
    }

    .nav-menu a {
        padding: 14px 20px;
        font-size: 15px;
    }

    /* QR code — make smaller */
    .fixed-qrcode {
        right: 2px;
        padding: 4px;
        border-radius: 6px;
    }

    .fixed-qrcode img {
        width: 70px;
    }

    .fixed-qrcode p {
        font-size: 10px;
    }

    /* Footer */
    .footer-container p {
        font-size: 13px;
    }

    .footer-copy {
        font-size: 12px;
    }
}

/* ============================================================
   Responsive - Small Mobile (≤360px)
   ============================================================ */
@media (max-width: 360px) {
    .section-title-wrap {
        font-size: 16px;
        gap: 4px;
    }

    .section-title-wrap img {
        height: 14px;
    }

    .review-marquee {
        width: calc(140px * 2 + 8px);
    }

    .review-panel {
        grid-template-columns: repeat(2, 140px);
        gap: 8px;
        margin-right: 8px;
    }

    .review-item img {
        height: 90px;
    }

    .benefit-card img {
        width: 44px;
        height: 44px;
    }

    .benefit-card h3 {
        font-size: 14px;
    }

    .benefit-card p {
        font-size: 12px;
    }
}