/* ===== 全局重置与变量 ===== */
:root {
    --primary: #e94560;
    --primary-dark: #c73650;
    --secondary: #0f3460;
    --accent: #16213e;
    --background: #f5f5f5;
    --surface: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #555;
    --text-light: #888;
    --border: #e0e0e0;
    --shadow: 0 8px 32px rgba(0,0,0,0.1);
    --shadow-hover: 0 12px 48px rgba(233,69,96,0.15);
    --radius: 16px;
    --radius-sm: 10px;
    --glass-bg: rgba(255,255,255,0.7);
    --glass-border: rgba(255,255,255,0.3);
    --glass-shadow: 0 8px 32px rgba(0,0,0,0.08);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
    --max-width: 1200px;
    --header-height: 70px;
    --gradient-hero: linear-gradient(135deg, #0f3460 0%, #16213e 50%, #1a1a2e 100%);
    --gradient-btn: linear-gradient(135deg, #e94560, #c73650);
    --gradient-card: linear-gradient(145deg, #ffffff, #f0f0f5);
}

/* ===== 暗色模式 ===== */
[data-theme="dark"] {
    --primary: #ff6b81;
    --primary-dark: #e94560;
    --secondary: #2a2a4a;
    --accent: #1e1e3a;
    --background: #0d0d1a;
    --surface: #1a1a2e;
    --text: #eaeaea;
    --text-secondary: #b0b0c0;
    --text-light: #8888aa;
    --border: #2a2a4a;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-hover: 0 12px 48px rgba(233,69,96,0.2);
    --glass-bg: rgba(26,26,46,0.7);
    --glass-border: rgba(255,255,255,0.08);
    --glass-shadow: 0 8px 32px rgba(0,0,0,0.3);
    --gradient-hero: linear-gradient(135deg, #0a0a1a 0%, #141428 50%, #1a1a3e 100%);
    --gradient-card: linear-gradient(145deg, #1a1a2e, #12122a);
}

/* ===== 基础样式 ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font);
    background: var(--background);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

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

a:hover, a:focus {
    color: var(--primary-dark);
    outline: none;
}

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

ul, ol {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.1rem; }

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

@keyframes fadeInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ===== 滚动动画类（由JS触发） ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ===== Header ===== */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

[data-theme="dark"] #header {
    background: rgba(13,13,26,0.85);
    border-bottom-color: rgba(255,255,255,0.05);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    font-size: 1.3rem;
    transition: transform var(--transition);
}

.logo:hover {
    transform: scale(1.02);
    color: var(--text);
}

.logo svg {
    flex-shrink: 0;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), #ff8a9e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: transform var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
    background: rgba(233,69,96,0.08);
}

.nav-links a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

#darkModeToggle, #mobileMenuToggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-secondary);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

#darkModeToggle:hover, #mobileMenuToggle:hover {
    background: rgba(233,69,96,0.1);
    color: var(--primary);
    transform: rotate(15deg);
}

#mobileMenuToggle {
    display: none;
}

/* ===== Hero Section ===== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
    padding: 120px 24px 80px;
    text-align: center;
    color: #fff;
}

#hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(233,69,96,0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(15,52,96,0.3) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
}

#hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(to top, var(--background), transparent);
    transition: background var(--transition);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    animation: fadeInUp 0.8s ease;
}

.hero-content h1 {
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 30%, #ff8a9e 70%, #e94560);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}

.hero-content p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.85);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
    min-width: 180px;
}

.btn-primary {
    background: var(--gradient-btn);
    color: #fff;
    box-shadow: 0 4px 20px rgba(233,69,96,0.3);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px rgba(233,69,96,0.4);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.4);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
    transform: translateY(-3px);
}

.hero-meta {
    font-size: 0.85rem !important;
    color: rgba(255,255,255,0.5) !important;
    letter-spacing: 0.5px;
}

/* ===== Sections Common ===== */
section {
    padding: 80px 24px;
    max-width: var(--max-width);
    margin: 0 auto;
}

section h2 {
    text-align: center;
    margin-bottom: 48px;
    position: relative;
    display: inline-block;
    width: 100%;
}

section h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-btn);
    border-radius: 4px;
    margin: 12px auto 0;
}

/* ===== About Section ===== */
#about {
    background: var(--surface);
    border-radius: var(--radius);
    margin: 0 24px 40px;
    padding: 60px 40px;
    box-shadow: var(--shadow);
    transition: background var(--transition), box-shadow var(--transition);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.about-grid article {
    background: var(--gradient-card);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    transition: all var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.about-grid article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-btn);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s ease;
}

.about-grid article:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.about-grid article:hover::before {
    transform: scaleX(1);
}

.about-grid h3 {
    color: var(--primary);
    margin-bottom: 12px;
    font-size: 1.2rem;
}

.about-grid p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== Products Section ===== */
#products {
    padding: 80px 24px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.products-grid article {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius);
    padding: 32px 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all var(--transition);
    position: relative;
}

.products-grid article:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: var(--shadow-hover);
    border-color: rgba(233,69,96,0.2);
}

[data-theme="dark"] .products-grid article {
    background: rgba(26,26,46,0.6);
}

.products-grid h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.products-grid p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== Features Section ===== */
#features {
    background: var(--surface);
    border-radius: var(--radius);
    margin: 0 24px 40px;
    padding: 60px 40px;
    box-shadow: var(--shadow);
    transition: background var(--transition), box-shadow var(--transition);
}

#features ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

#features li {
    background: var(--gradient-card);
    border-radius: var(--radius-sm);
    padding: 20px 24px;
    border: 1px solid var(--border);
    transition: all var(--transition);
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

#features li:hover {
    transform: translateX(6px);
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(233,69,96,0.1);
}

#features li::before {
    content: '✦';
    color: var(--primary);
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 2px;
}

#features li strong {
    color: var(--text);
    margin-right: 4px;
}

/* ===== Download Section ===== */
#download {
    padding: 80px 24px;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.download-grid article {
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius);
    padding: 40px 28px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: all var(--transition);
}

.download-grid article:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

[data-theme="dark"] .download-grid article {
    background: rgba(26,26,46,0.6);
}

.download-grid h3 {
    color: var(--primary);
    margin-bottom: 16px;
    font-size: 1.4rem;
}

.download-grid p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.download-grid .btn-primary {
    display: inline-flex;
    margin: 8px 0 16px;
}

/* ===== FAQ Section ===== */
#faq {
    background: var(--surface);
    border-radius: var(--radius);
    margin: 0 24px 40px;
    padding: 60px 40px;
    box-shadow: var(--shadow);
    transition: background var(--transition), box-shadow var(--transition);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

details {
    background: var(--gradient-card);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    transition: all var(--transition);
    overflow: hidden;
}

details:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(233,69,96,0.08);
}

details[open] {
    border-color: var(--primary);
    box-shadow: 0 4px 24px rgba(233,69,96,0.12);
}

summary {
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color var(--transition);
    user-select: none;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--primary);
    transition: transform var(--transition);
    font-weight: 300;
}

details[open] summary::after {
    transform: rotate(45deg);
}

details p {
    padding: 0 24px 20px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== HowTo Section ===== */
#howto {
    padding: 80px 24px;
}

#howto ol {
    max-width: 700px;
    margin: 0 auto;
    counter-reset: step;
}

#howto li {
    counter-increment: step;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-sm);
    padding: 20px 24px 20px 60px;
    margin-bottom: 12px;
    border: 1px solid var(--glass-border);
    position: relative;
    transition: all var(--transition);
    color: var(--text-secondary);
}

#howto li:hover {
    transform: translateX(6px);
    border-color: var(--primary);
}

#howto li::before {
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--gradient-btn);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
}

#howto li strong {
    color: var(--text);
    display: block;
    margin-bottom: 4px;
}

[data-theme="dark"] #howto li {
    background: rgba(26,26,46,0.5);
}

/* ===== Contact Section ===== */
#contact {
    background: var(--surface);
    border-radius: var(--radius);
    margin: 0 24px 40px;
    padding: 60px 40px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: background var(--transition), box-shadow var(--transition);
}

#contact address {
    font-style: normal;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

#contact address p {
    padding: 16px 20px;
    background: var(--gradient-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

#contact address p:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    box-shadow: 0 4px 16px rgba(233,69,96,0.08);
}

#contact address strong {
    color: var(--primary);
    display: block;
    margin-bottom: 4px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== Footer ===== */
footer {
    background: var(--accent);
    color: #fff;
    padding: 60px 24px 24px;
    margin-top: 40px;
    transition: background var(--transition);
}

[data-theme="dark"] footer {
    background: #0a0a1a;
}

.footer-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-grid h4 {
    color: var(--primary);
    margin-bottom: 16px;
    font-size: 1rem;
}

.footer-grid p, .footer-grid li {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    line-height: 2;
}

.footer-grid a {
    color: rgba(255,255,255,0.7);
    transition: all var(--transition);
}

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

.footer-copy {
    max-width: var(--max-width);
    margin: 24px auto 0;
    text-align: center;
    color: rgba(255,255,255,0.4);
    font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    section {
        padding: 60px 20px;
    }
    #about, #features, #faq, #contact {
        margin: 0 16px 32px;
        padding: 40px 24px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
        transform: translateY(-120%);
        opacity: 0;
        transition: all 0.4s ease;
        box-shadow: 0 8px 32px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--glass-border);
        z-index: 999;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
    }

    .nav-links a {
        padding: 12px 16px;
        width: 100%;
        text-align: center;
        font-size: 1rem;
    }

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

    #mobileMenuToggle {
        display: flex;
    }

    #hero {
        padding: 100px 20px 60px;
    }

    .hero-content h1 {
        font-size: clamp(1.6rem, 6vw, 2.4rem);
    }

    .hero-content p {
        font-size: 1rem;
    }

    .btn-primary, .btn-secondary {
        min-width: 140px;
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .about-grid, .products-grid, .download-grid {
        grid-template-columns: 1fr;
    }

    #features ul {
        grid-template-columns: 1fr;
    }

    #contact address {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}

@media (max-width: 480px) {
    section {
        padding: 40px 16px;
    }

    #about, #features, #faq, #contact {
        margin: 0 8px 24px;
        padding: 28px 16px;
    }

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

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

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    details summary {
        font-size: 0.95rem;
        padding: 14px 16px;
    }

    details p {
        padding: 0 16px 16px;
        font-size: 0.9rem;
    }
}