/* ============================================
   PW Kernel 内核科技 - 主样式表
   iOS 液态玻璃风格 · 暗色/亮色模式
   ============================================ */

/* ============ CSS 变量 ============ */
:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
    --transition-smooth: 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --shadow-ios: 0 2px 20px rgba(0, 0, 0, 0.08), 0 8px 40px rgba(0, 0, 0, 0.04);
    --shadow-ios-lg: 0 4px 30px rgba(0, 0, 0, 0.12), 0 12px 60px rgba(0, 0, 0, 0.06);
}

/* 暗色模式（默认） */
body.dark-mode {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-tertiary: #1a1a25;
    --text-primary: #f5f5f7;
    --text-secondary: #c7c7cc;
    --text-tertiary: #8e8e93;
    --glass-bg: rgba(22, 22, 32, 0.65);
    --glass-bg-hover: rgba(28, 28, 40, 0.75);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-border-hover: rgba(255, 255, 255, 0.22);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --accent-primary: #5e8bff;
    --accent-secondary: #7c6ff7;
    --accent-gradient: linear-gradient(135deg, #5e8bff 0%, #8b5cf6 50%, #a78bfa 100%);
    --accent-glow: rgba(94, 139, 255, 0.3);
    --toggle-track-bg: #3a3a45;
    --toggle-thumb-bg: #f5f5f7;
    --snow-color: rgba(255, 255, 255, 0.55);
    --particle-color: rgba(140, 160, 255, 0.5);
    --card-highlight: rgba(255, 255, 255, 0.03);
}

/* 亮色模式 */
body.light-mode {
    --bg-primary: #f2f2f7;
    --bg-secondary: #e8e8ed;
    --bg-tertiary: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #aeaeb2;
    --glass-bg: rgba(255, 255, 255, 0.62);
    --glass-bg-hover: rgba(255, 255, 255, 0.78);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-border-hover: rgba(0, 0, 0, 0.18);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --accent-primary: #3b6ef7;
    --accent-secondary: #6c5ce7;
    --accent-gradient: linear-gradient(135deg, #3b6ef7 0%, #6c5ce7 50%, #8b5cf6 100%);
    --accent-glow: rgba(59, 110, 247, 0.25);
    --toggle-track-bg: #d1d1d6;
    --toggle-thumb-bg: #ffffff;
    --snow-color: rgba(180, 190, 210, 0.45);
    --particle-color: rgba(80, 110, 220, 0.35);
    --card-highlight: rgba(0, 0, 0, 0.02);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    transition: background var(--transition-smooth), color var(--transition-smooth);
}

/* ============ Canvas 背景 ============ */
#bgCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ============ 背景浮动文字 ============ */
.bg-floating-texts {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.bg-float-text {
    position: absolute;
    font-family: var(--font-family);
    font-weight: 800;
    font-size: clamp(2.5rem, 6vw, 8rem);
    color: var(--text-primary);
    opacity: 0.03;
    white-space: nowrap;
    letter-spacing: 0.05em;
    animation: bgFloat 18s ease-in-out infinite;
    transition: color var(--transition-smooth);
    user-select: none;
}

@keyframes bgFloat {
    0%,
    100% {
        transform: translateY(0) translateX(0) scale(1);
    }
    20% {
        transform: translateY(-30px) translateX(15px) scale(1.03);
    }
    40% {
        transform: translateY(-10px) translateX(-20px) scale(0.97);
    }
    60% {
        transform: translateY(25px) translateX(10px) scale(1.02);
    }
    80% {
        transform: translateY(-15px) translateX(-8px) scale(0.98);
    }
}

/* ============ 鼠标光晕 ============ */
.mouse-glow {
    position: fixed;
    pointer-events: none;
    z-index: 1;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    will-change: left, top, opacity;
}

/* ============ 导航栏 ============ */
.navbar {
    position: fixed;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    width: calc(100% - 40px);
    max-width: 800px;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 22px;
    background: var(--glass-bg);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    transition: all var(--transition-smooth);
}

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

.logo-icon {
    display: flex;
    align-items: center;
    color: var(--accent-primary);
    transition: color var(--transition-smooth);
}

.logo-text {
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    transition: color var(--transition-smooth);
}

.logo-highlight {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mode-label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-smooth);
    user-select: none;
}

/* ============ iOS Toggle Switch ============ */
.ios-toggle {
    position: relative;
    display: inline-block;
    width: 51px;
    height: 31px;
    cursor: pointer;
    flex-shrink: 0;
}

.ios-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-track {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--toggle-track-bg);
    border-radius: 31px;
    transition: background var(--transition-smooth);
    border: 1px solid var(--glass-border);
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 25px;
    height: 25px;
    background: var(--toggle-thumb-bg);
    border-radius: 50%;
    transition: transform var(--transition-bounce);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.ios-toggle input:checked+.toggle-track .toggle-thumb {
    transform: translateX(20px);
}

.ios-toggle input:checked+.toggle-track {
    background: var(--accent-primary);
    border-color: transparent;
}

.toggle-icon-dark,
.toggle-icon-light {
    position: absolute;
    font-size: 13px;
    transition: opacity 0.2s ease;
    line-height: 1;
}

.toggle-icon-dark {
    opacity: 1;
}

.toggle-icon-light {
    opacity: 0;
}

.ios-toggle input:checked+.toggle-track .toggle-icon-dark {
    opacity: 0;
}

.ios-toggle input:checked+.toggle-track .toggle-icon-light {
    opacity: 1;
}

/* ============ 主内容区 ============ */
.main-content {
    position: relative;
    z-index: 2;
    padding-top: 100px;
    padding-bottom: 60px;
    max-width: 1100px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

/* ============ Hero 区域 ============ */
.hero-section {
    text-align: center;
    padding: 40px 0 50px;
}

.hero-glass-card {
    display: inline-block;
    background: var(--glass-bg);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    box-shadow: var(--glass-shadow);
    max-width: 700px;
    width: 100%;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.hero-glass-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 20%, var(--card-highlight) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.hero-glass-card>* {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background: var(--glass-bg-hover);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 7px 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 20px;
    transition: all var(--transition-smooth);
}

.badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #4ade80;
    box-shadow: 0 0 10px #4ade80;
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
    0%,
    100% {
        box-shadow: 0 0 6px #4ade80;
    }
    50% {
        box-shadow: 0 0 16px #4ade80, 0 0 28px rgba(74, 222, 128, 0.5);
    }
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 12px;
    transition: color var(--transition-smooth);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
    transition: color var(--transition-smooth);
}

.hero-desc {
    font-size: 0.95rem;
    color: var(--text-tertiary);
    line-height: 1.7;
    margin-bottom: 28px;
    transition: color var(--transition-smooth);
}

.hero-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============ 按钮样式 ============ */
.ios-glass-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: 50px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg-hover);
    color: var(--text-primary);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    transition: all var(--transition-smooth);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.ios-glass-btn:hover {
    background: var(--glass-bg);
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-ios-lg);
    transform: translateY(-1px);
}

.ios-glass-btn:active {
    transform: scale(0.97);
    transition: transform 0.15s ease;
}

.btn-primary {
    background: var(--accent-gradient);
    border: none;
    color: #ffffff;
    font-weight: 600;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    box-shadow: 0 6px 28px var(--accent-glow);
    transform: translateY(-2px);
    color: #ffffff;
}

.btn-secondary {
    background: var(--glass-bg);
}

/* ============ 区块标题 ============ */
.section-title {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 6px;
    transition: color var(--transition-smooth);
}

.section-subtitle {
    text-align: center;
    font-size: 0.95rem;
    color: var(--text-tertiary);
    margin-bottom: 36px;
    transition: color var(--transition-smooth);
}

/* ============ 优点展示区 ============ */
.features-section {
    padding: 40px 0 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 18px;
}

.feature-card {
    background: var(--glass-bg);
    backdrop-filter: blur(25px) saturate(160%);
    -webkit-backdrop-filter: blur(25px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    cursor: default;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 80% 10%, var(--card-highlight) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.feature-card>* {
    position: relative;
    z-index: 1;
}

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

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    background: var(--glass-bg-hover);
    border: 1px solid var(--glass-border);
    color: var(--accent-primary);
    margin-bottom: 16px;
    transition: all var(--transition-smooth);
}

.feature-card:hover .feature-icon {
    color: #fff;
    background: var(--accent-gradient);
    border-color: transparent;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    transition: color var(--transition-smooth);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    line-height: 1.6;
    transition: color var(--transition-smooth);
}

/* ============ 截图展示区 ============ */
.screenshots-section {
    padding: 40px 0 50px;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 22px;
}

.screenshot-card {
    background: var(--glass-bg);
    backdrop-filter: blur(25px) saturate(160%);
    -webkit-backdrop-filter: blur(25px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 16px;
    transition: all var(--transition-smooth);
    overflow: hidden;
}

.screenshot-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-ios-lg);
    transform: translateY(-3px);
}

.screenshot-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    padding: 0 4px;
    transition: color var(--transition-smooth);
}

.screenshot-img-wrapper {
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg-tertiary);
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-smooth);
}

.screenshot-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

.screenshot-card:hover .screenshot-img-wrapper img {
    transform: scale(1.03);
}

.img-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

.screenshot-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
    padding: 0 4px;
}

.meta-tag {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--accent-primary);
    background: var(--glass-bg-hover);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 4px 11px;
    transition: all var(--transition-smooth);
}

/* ============ 价格区 ============ */
.pricing-section {
    padding: 40px 0 50px;
}

.discount-badge {
    display: inline-block;
    background: rgba(255, 140, 60, 0.15);
    border: 1px solid rgba(255, 140, 60, 0.35);
    color: #ff9a56;
    border-radius: 50px;
    padding: 6px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    animation: badgeShine 3s ease-in-out infinite;
}

@keyframes badgeShine {
    0%,
    100% {
        box-shadow: 0 0 10px rgba(255, 140, 60, 0.2);
    }
    50% {
        box-shadow: 0 0 22px rgba(255, 140, 60, 0.45);
    }
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    align-items: stretch;
}

.pricing-card {
    background: var(--glass-bg);
    backdrop-filter: blur(25px) saturate(160%);
    -webkit-backdrop-filter: blur(25px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-ios-lg);
    transform: translateY(-4px);
}

.pricing-card-popular {
    border-color: var(--accent-primary);
    box-shadow: 0 0 30px var(--accent-glow);
    transform: scale(1.03);
}

.pricing-card-popular:hover {
    transform: scale(1.04) translateY(-4px);
}

.pricing-ribbon {
    position: absolute;
    top: 12px;
    right: -28px;
    background: var(--accent-gradient);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 5px 30px;
    transform: rotate(45deg);
    letter-spacing: 0.04em;
}

.ribbon-hot {
    background: linear-gradient(135deg, #ff6b6b, #ff8e53);
}

.ribbon-value {
    background: linear-gradient(135deg, #4ade80, #22c55e);
}

.pricing-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    transition: color var(--transition-smooth);
}

.pricing-desc {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 16px;
    transition: color var(--transition-smooth);
}

.pricing-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 1px;
    margin-bottom: 8px;
}

.currency {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--transition-smooth);
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    transition: color var(--transition-smooth);
}

.period {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-tertiary);
    transition: color var(--transition-smooth);
}

.pricing-old-price {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    text-decoration: line-through;
    margin-bottom: 18px;
    transition: color var(--transition-smooth);
}

.pricing-btn {
    display: block;
    text-align: center;
    padding: 14px 20px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg-hover);
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-smooth);
    margin-top: auto;
}

.pricing-btn:hover {
    background: var(--glass-bg);
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-ios);
}

.pricing-btn-primary {
    background: var(--accent-gradient);
    border: none;
    color: #fff;
    box-shadow: 0 4px 18px var(--accent-glow);
}

.pricing-btn-primary:hover {
    box-shadow: 0 6px 26px var(--accent-glow);
    color: #fff;
}

/* ============ CTA 区 ============ */
.cta-section {
    padding: 30px 0 50px;
    text-align: center;
}

.cta-glass-card {
    display: inline-block;
    background: var(--glass-bg);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 40px 36px;
    box-shadow: var(--glass-shadow);
    max-width: 550px;
    width: 100%;
    transition: all var(--transition-smooth);
}

.cta-glass-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    transition: color var(--transition-smooth);
}

.cta-glass-card p {
    font-size: 0.95rem;
    color: var(--text-tertiary);
    margin-bottom: 20px;
    transition: color var(--transition-smooth);
}

.cta-btn {
    font-size: 1rem;
    padding: 15px 32px;
}

.cta-link-text {
    margin-top: 16px;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    word-break: break-all;
    transition: color var(--transition-smooth);
}

/* ============ 社群区 ============ */
.community-section {
    padding: 40px 0 50px;
}

.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 22px;
}

.community-card {
    background: var(--glass-bg);
    backdrop-filter: blur(25px) saturate(160%);
    -webkit-backdrop-filter: blur(25px) saturate(160%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 22px;
    display: flex;
    gap: 20px;
    align-items: center;
    transition: all var(--transition-smooth);
}

.community-card:hover {
    border-color: var(--glass-border-hover);
    box-shadow: var(--shadow-ios-lg);
    transform: translateY(-3px);
}

.community-qr {
    flex-shrink: 0;
    width: 120px;
    height: 120px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.community-qr img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.qr-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: #999;
    font-weight: 700;
    font-size: 1.2rem;
}

.community-info {
    flex: 1;
    min-width: 0;
}

.community-info h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    transition: color var(--transition-smooth);
}

.community-qq {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    transition: color var(--transition-smooth);
}

.community-qq strong {
    color: var(--accent-primary);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.community-desc {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    line-height: 1.5;
    margin-bottom: 12px;
    transition: color var(--transition-smooth);
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.8rem;
    border-radius: 50px;
    cursor: pointer;
    background: var(--glass-bg-hover);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    transition: all var(--transition-smooth);
    font-family: var(--font-family);
}

.copy-btn:hover {
    border-color: var(--glass-border-hover);
    color: var(--text-primary);
    background: var(--glass-bg);
}

.copy-btn.copied {
    background: #4ade80;
    border-color: #4ade80;
    color: #fff;
}

/* ============ 页脚 ============ */
.footer {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 20px 24px 40px;
}

.footer-inner {
    display: inline-block;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(150%);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    max-width: 600px;
    width: 100%;
    transition: all var(--transition-smooth);
}

.footer-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 4px;
    transition: color var(--transition-smooth);
}

.footer-tagline {
    font-size: 0.82rem;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    transition: color var(--transition-smooth);
}

.footer-copy {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    transition: color var(--transition-smooth);
}

.footer-links {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    transition: color var(--transition-smooth);
}

.footer-links a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-smooth);
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-divider {
    color: var(--text-tertiary);
    opacity: 0.5;
}

/* ============ Toast 提示 ============ */
.toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    z-index: 200;
    background: var(--glass-bg);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    box-shadow: var(--shadow-ios-lg);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============ 响应式设计 ============ */
@media (max-width: 768px) {
    .navbar {
        top: 8px;
        width: calc(100% - 20px);
    }

    .nav-inner {
        padding: 10px 16px;
        border-radius: var(--radius-md);
    }

    .logo-text {
        font-size: 1.15rem;
    }

    .main-content {
        padding-top: 80px;
        padding-left: 12px;
        padding-right: 12px;
    }

    .hero-glass-card {
        padding: 32px 20px;
    }

    .hero-title {
        font-size: 1.7rem;
    }

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

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

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

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

    .pricing-card-popular {
        transform: scale(1);
    }

    .pricing-card-popular:hover {
        transform: scale(1.01) translateY(-4px);
    }

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

    .community-card {
        flex-direction: column;
        text-align: center;
    }

    .community-qr {
        width: 100px;
        height: 100px;
    }

    .bg-float-text {
        font-size: clamp(1.5rem, 8vw, 4rem);
    }

    .mouse-glow {
        width: 180px;
        height: 180px;
    }
}

@media (max-width: 480px) {
    .nav-inner {
        padding: 8px 12px;
    }

    .logo-text {
        font-size: 1rem;
    }

    .mode-label {
        display: none;
    }

    .hero-glass-card {
        padding: 24px 14px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .pricing-amount .price {
        font-size: 2.4rem;
    }

    .cta-glass-card {
        padding: 24px 18px;
    }
}