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

:root {
    --color-primary: #8B5E3C;
    --color-primary-light: #A67C52;
    --color-primary-dark: #6B4226;
    --color-accent: #D4A574;
    --color-accent-light: #E8C9A0;
    --color-bg: #FFFBF5;
    --color-bg-warm: #FAECBE;
    --color-bg-section: #FFF8EE;
    --color-text: #2D1B0E;
    --color-text-secondary: #6B5B4E;
    --color-text-light: #9B8B7E;
    --color-border: #E8D5C0;
    --color-white: #FFFFFF;
    --color-card: #FFFFFF;
    --shadow-sm: 0 2px 8px rgba(139, 94, 60, 0.08);
    --shadow-md: 0 4px 20px rgba(139, 94, 60, 0.12);
    --shadow-lg: 0 8px 40px rgba(139, 94, 60, 0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul {
    list-style: none;
}

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

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

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 251, 245, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(232, 213, 192, 0.5);
    transition: all var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 251, 245, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.nav-links {
    display: flex;
    gap: 36px;
}

.nav-links a {
    font-size: 15px;
    color: var(--color-text-secondary);
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transition: width var(--transition);
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero ===== */
.hero {
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, var(--color-bg-warm) 0%, var(--color-bg) 100%);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-text {
    flex: 1;
    max-width: 560px;
}

.hero-text h1 {
    font-size: 52px;
    font-weight: 800;
    color: var(--color-primary-dark);
    line-height: 1.2;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 22px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 16px;
}

.hero-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-xl);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 94, 60, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-primary);
}

.stat-label {
    font-size: 13px;
    color: var(--color-text-light);
    margin-top: 2px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.phone-mockup {
    width: 280px;
    height: 540px;
    background: var(--color-text);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-lg), 0 0 0 2px rgba(139, 94, 60, 0.1);
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 24px;
    background: var(--color-text);
    border-radius: 0 0 16px 16px;
    z-index: 2;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--color-bg-warm);
    border-radius: 30px;
    overflow: hidden;
}

.screen-header {
    padding: 40px 20px 16px;
    text-align: center;
    font-size: 17px;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.screen-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 12px 20px;
}

.screen-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 20px 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.screen-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.screen-label {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.hero-bg-decoration {
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 165, 116, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

/* ===== Section Common ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(139, 94, 60, 0.08);
    color: var(--color-primary);
    border-radius: var(--radius-xl);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-primary-dark);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* ===== Features ===== */
.features {
    padding: 100px 0;
    background: var(--color-bg);
}

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

.feature-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(139, 94, 60, 0.08);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ===== Modules ===== */
.modules {
    padding: 100px 0;
    background: var(--color-bg-section);
}

.modules-list {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.module-item {
    display: flex;
    align-items: center;
    gap: 60px;
}

.module-item.reverse {
    flex-direction: row-reverse;
}

.module-number {
    font-size: 80px;
    font-weight: 900;
    color: rgba(139, 94, 60, 0.06);
    line-height: 1;
    flex-shrink: 0;
    width: 100px;
}

.module-content {
    flex: 1;
}

.module-content h3 {
    font-size: 26px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 14px;
}

.module-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: 20px;
}

.module-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.module-tags li {
    padding: 6px 16px;
    background: rgba(139, 94, 60, 0.06);
    color: var(--color-primary);
    border-radius: var(--radius-xl);
    font-size: 13px;
    font-weight: 500;
}

.module-visual {
    flex-shrink: 0;
}

.module-phone {
    width: 240px;
    background: var(--color-white);
    border-radius: 24px;
    padding: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.mp-header {
    text-align: center;
    font-size: 15px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
}

.mp-grade-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}

.mp-tab {
    flex: 1;
    text-align: center;
    padding: 6px 0;
    font-size: 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text-light);
    background: var(--color-bg);
}

.mp-tab.active {
    background: var(--color-primary);
    color: var(--color-white);
}

.mp-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mp-unit {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-light);
    margin-top: 6px;
}

.mp-text {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 8px 12px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

.mp-freq {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mp-freq-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 10px 14px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

.freq-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.freq-dot.high {
    background: #E74C3C;
}

.freq-dot.mid {
    background: #F39C12;
}

.freq-dot.low {
    background: #27AE60;
}

/* ===== Highlights ===== */
.highlights {
    padding: 100px 0;
    background: var(--color-bg);
}

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

.highlight-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition);
}

.highlight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.highlight-num {
    font-size: 48px;
    font-weight: 900;
    color: rgba(139, 94, 60, 0.08);
    margin-bottom: 12px;
    line-height: 1;
}

.highlight-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 10px;
}

.highlight-card p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ===== Download ===== */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    color: var(--color-white);
}

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

.download-content h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
}

.download-content > p {
    font-size: 18px;
    opacity: 0.85;
    margin-bottom: 48px;
}

.download-qrcode {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 36px;
}

.qrcode-wrapper {
    width: 220px;
    height: 220px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    margin-bottom: 16px;
}

.qrcode-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.qrcode-tip {
    font-size: 15px;
    font-weight: 500;
    opacity: 0.85;
}

.download-cta {
    margin-top: 12px;
}

.cta-tip {
    font-size: 14px;
    opacity: 0.7;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 280px;
}

.footer-brand .logo-icon {
    width: 36px;
    height: 36px;
    font-size: 18px;
}

.footer-brand .logo-text {
    color: var(--color-white);
    font-size: 18px;
}

.footer-brand p {
    margin-top: 12px;
    font-size: 14px;
    opacity: 0.6;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col a {
    font-size: 14px;
    opacity: 0.6;
    transition: opacity var(--transition);
}

.footer-col a:hover {
    opacity: 1;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    opacity: 0.5;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.footer-bottom a {
    transition: opacity var(--transition);
}

.footer-bottom a:hover {
    opacity: 1;
}

/* ===== Responsive ===== */

/* Tablet */
@media (max-width: 1024px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        width: 100%;
    }

    .phone-mockup {
        width: 240px;
        height: 460px;
    }

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

    .module-item,
    .module-item.reverse {
        flex-direction: column;
        text-align: center;
    }

    .module-number {
        width: auto;
    }

    .module-tags {
        justify-content: center;
    }

    .module-visual {
        order: -1;
    }

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

    .qrcode-wrapper {
        width: 180px;
        height: 180px;
    }

    .footer-content {
        flex-direction: column;
        gap: 40px;
    }

    .footer-links {
        gap: 40px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(255, 251, 245, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px 24px;
        gap: 0;
        border-bottom: 1px solid var(--color-border);
    }

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

    .nav-links li {
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .nav-links a {
        display: block;
        padding: 14px 0;
        font-size: 16px;
    }

    .nav-links a::after {
        display: none;
    }

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

    .hero {
        padding: 120px 0 60px;
    }

    .hero-text h1 {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-num {
        font-size: 22px;
    }

    .phone-mockup {
        width: 200px;
        height: 380px;
        border-radius: 30px;
        padding: 8px;
    }

    .phone-mockup::before {
        width: 70px;
        height: 18px;
        top: 8px;
    }

    .phone-screen {
        border-radius: 24px;
    }

    .screen-header {
        padding: 30px 16px 12px;
        font-size: 15px;
    }

    .screen-body {
        gap: 8px;
        padding: 8px 16px;
    }

    .screen-card {
        padding: 14px 8px;
    }

    .screen-icon {
        font-size: 22px;
    }

    .screen-label {
        font-size: 11px;
    }

    .section-header h2 {
        font-size: 28px;
    }

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

    .feature-card {
        padding: 28px 24px;
    }

    .modules-list {
        gap: 60px;
    }

    .module-number {
        font-size: 56px;
    }

    .module-content h3 {
        font-size: 22px;
    }

    .module-phone {
        width: 200px;
        padding: 16px;
    }

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

    .highlight-card {
        padding: 28px 24px;
    }

    .download-content h2 {
        font-size: 28px;
    }

    .qrcode-wrapper {
        width: 160px;
        height: 160px;
        padding: 12px;
    }

    .footer-links {
        flex-direction: column;
        gap: 30px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-text h1 {
        font-size: 30px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .stat-item {
        flex-direction: row;
        gap: 8px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .section-header p {
        font-size: 14px;
    }

    .module-phone {
        width: 180px;
    }
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.highlight-card,
.module-item {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.feature-card.visible,
.highlight-card.visible,
.module-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 4px;
}

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