/* ===========================
   DriveClear Pro 官网样式 - 天空蓝主题
   =========================== */

/* CSS 变量 */
:root {
    --bg-primary: #f0f7ff;
    --bg-secondary: #e4f0fb;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fbff;
    --border-color: #c8ddf0;
    --text-primary: #1a2b4a;
    --text-secondary: #4a6a8f;
    --text-muted: #7a9abb;
    --accent-sky: #0ea5e9;
    --accent-sky-light: #38bdf8;
    --accent-sky-dark: #0284c7;
    --accent-blue: #3b82f6;
    --accent-indigo: #6366f1;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-orange: #f59e0b;
    --accent-teal: #14b8a6;
    --gradient-primary: linear-gradient(135deg, #0ea5e9, #3b82f6);
    --gradient-accent: linear-gradient(135deg, #6366f1, #3b82f6);
    --gradient-hero: linear-gradient(135deg, #0c1929 0%, #0f2744 30%, #164e7a 60%, #0c1929 100%);
    --shadow-sm: 0 2px 8px rgba(14, 165, 233, 0.08);
    --shadow-md: 0 4px 16px rgba(14, 165, 233, 0.12);
    --shadow-lg: 0 8px 32px rgba(14, 165, 233, 0.16);
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Source Code Pro", Consolas, monospace;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent-sky);
    text-decoration: none;
    transition: var(--transition);
}
a:hover { color: var(--accent-sky-dark); }

img { max-width: 100%; height: auto; }
code { font-family: var(--font-mono); background: rgba(14,165,233,0.08); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; color: var(--accent-sky-dark); }

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

/* ===========================
   导航栏
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(240, 247, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}
.navbar.scrolled {
    border-bottom-color: var(--border-color);
    background: rgba(240, 247, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}
.nav-logo:hover { color: var(--text-primary); }
.nav-logo-icon { width: 32px; height: 32px; }
.nav-logo-text small { color: var(--accent-sky); font-weight: 400; font-size: 0.85em; }

.nav-links {
    display: flex;
    list-style: none;
    gap: 4px;
}
.nav-links a {
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}
.nav-links a:hover {
    color: var(--accent-sky);
    background: rgba(14, 165, 233, 0.06);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===========================
   英雄区域
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: 0;
}
.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 25% 40%, rgba(14, 165, 233, 0.15) 0%, transparent 55%),
                radial-gradient(ellipse at 75% 60%, rgba(59, 130, 246, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 50% 80%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
    animation: heroFloat 25s ease-in-out infinite alternate;
}
.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%230ea5e9' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
@keyframes heroFloat {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-3%, 3%); }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 12px;
    color: #fff;
}
.gradient-text {
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 20px;
    font-weight: 600;
}

.hero-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 32px;
    max-width: 540px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 36px;
}
.stat-item {
    display: flex;
    flex-direction: column;
}
.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: #38bdf8;
    font-family: var(--font-mono);
}
.stat-label {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.hero-note {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

.hero-visual {
    display: flex;
    justify-content: center;
}
.hero-screenshot {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 80px rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(255,255,255,0.1);
    transition: var(--transition);
}
.hero-screenshot:hover {
    transform: translateY(-4px);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5), 0 0 100px rgba(14, 165, 233, 0.2);
}
.hero-screenshot img {
    display: block;
    width: 100%;
}

/* ===========================
   按钮
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: var(--font-sans);
}
.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(14, 165, 233, 0.45);
    color: #fff;
}
.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
}
.btn-outline:hover {
    border-color: var(--accent-sky);
    background: rgba(14, 165, 233, 0.06);
    color: var(--accent-sky);
    transform: translateY(-2px);
}
/* 英雄区域内的outline按钮白色变体 */
.hero .btn-outline {
    color: rgba(255,255,255,0.9);
    border-color: rgba(255,255,255,0.25);
}
.hero .btn-outline:hover {
    color: #fff;
    border-color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.08);
}
.btn-lg { padding: 14px 32px; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* ===========================
   通用段落
   =========================== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    background: rgba(14, 165, 233, 0.08);
    color: var(--accent-sky);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
    color: var(--text-primary);
}
.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   功能卡片
   =========================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}
.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(14, 165, 233, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}
.icon-drive { background: rgba(14, 165, 233, 0.1); color: var(--accent-sky); }
.icon-fill { background: rgba(16, 185, 129, 0.1); color: var(--accent-green); }
.icon-safe { background: rgba(99, 102, 241, 0.1); color: var(--accent-indigo); }
.icon-verify { background: rgba(245, 158, 11, 0.1); color: var(--accent-orange); }
.icon-speed { background: rgba(14, 165, 233, 0.1); color: var(--accent-sky); }
.icon-loop { background: rgba(16, 185, 129, 0.1); color: var(--accent-green); }
.icon-timer { background: rgba(99, 102, 241, 0.1); color: var(--accent-indigo); }
.icon-key { background: rgba(245, 158, 11, 0.1); color: var(--accent-orange); }
.icon-log { background: rgba(20, 184, 166, 0.1); color: var(--accent-teal); }

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}
.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===========================
   截图区域
   =========================== */
.screenshots {
    background: var(--bg-secondary);
}

.screenshot-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.tab-btn {
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}
.tab-btn:hover {
    border-color: var(--accent-sky);
    color: var(--accent-sky);
}
.tab-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.screenshot-views {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}
.screenshot-view {
    display: none;
    text-align: center;
    animation: fadeIn 0.4s ease;
}
.screenshot-view.active { display: block; }
.screenshot-view img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    max-height: 560px;
    object-fit: contain;
    background: #fff;
}
.screenshot-caption {
    margin-top: 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===========================
   使用说明
   =========================== */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}
.step-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}
.step-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(14, 165, 233, 0.3);
}
.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}
.step-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.warning-box {
    display: flex;
    gap: 20px;
    background: rgba(239, 68, 68, 0.04);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    padding: 28px 32px;
}
.warning-icon {
    flex-shrink: 0;
    color: var(--accent-red);
    margin-top: 2px;
}
.warning-content h4 {
    color: var(--accent-red);
    font-size: 1.05rem;
    margin-bottom: 12px;
}
.warning-content ul {
    list-style: none;
}
.warning-content li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}
.warning-content li::before {
    content: '•';
    color: var(--accent-red);
    position: absolute;
    left: 0;
    font-weight: 700;
}

/* ===========================
   下载区域
   =========================== */
.download {
    background: var(--bg-secondary);
}

.download-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    position: relative;
    transition: var(--transition);
}
.download-card:hover {
    border-color: rgba(14, 165, 233, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.download-main {
    border-color: rgba(14, 165, 233, 0.3);
    box-shadow: 0 0 40px rgba(14, 165, 233, 0.06);
}
.download-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: #fff;
    padding: 4px 20px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.download-icon {
    color: var(--accent-sky);
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.download-version {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 24px;
}
.download-features {
    list-style: none;
    text-align: left;
    margin-bottom: 28px;
}
.download-features li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
}
.download-features li::before {
    content: '✓';
    color: var(--accent-green);
    position: absolute;
    left: 0;
    font-weight: 700;
}

/* ===========================
   FAQ
   =========================== */
.faq-list {
    max-width: 760px;
    margin: 0 auto;
}
.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
    background: var(--bg-card);
}
.faq-item:hover {
    border-color: rgba(14, 165, 233, 0.3);
}
.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
    font-family: var(--font-sans);
}
.faq-question:hover {
    background: rgba(14, 165, 233, 0.03);
}
.faq-arrow {
    transition: var(--transition);
    flex-shrink: 0;
    color: var(--text-muted);
}
.faq-item.open .faq-arrow {
    transform: rotate(180deg);
    color: var(--accent-sky);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.faq-answer-inner {
    padding: 0 24px 20px;
}
.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ===========================
   留言反馈
   =========================== */
.feedback-wrapper {
    max-width: 760px;
    margin: 0 auto;
}
.feedback-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 36px;
    margin-bottom: 40px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    transition: var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-sky);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}
.form-group textarea { resize: vertical; }

.form-msg {
    margin-top: 12px;
    font-size: 0.9rem;
    display: none;
}
.form-msg.success { display: block; color: var(--accent-green); }
.form-msg.error { display: block; color: var(--accent-red); }

.feedback-list {
    display: grid;
    gap: 16px;
}
.feedback-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px 24px;
}
.feedback-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
.feedback-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
}
.feedback-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}
.feedback-time {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-left: auto;
}
.feedback-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    padding-left: 48px;
}

/* ===========================
   页脚
   =========================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 0;
}
.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}
.footer-logo-icon { width: 28px; height: 28px; }
.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 4px;
}
.footer-copy { color: var(--text-muted); font-size: 0.8rem !important; }

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.footer-col a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 4px 0;
}
.footer-col a:hover { color: var(--accent-sky); }

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
}
.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===========================
   Toast 弹窗（替代浏览器 alert）
   =========================== */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: #1a2b4a;
    color: #fff;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 8px 32px rgba(26, 43, 74, 0.25), 0 2px 8px rgba(14, 165, 233, 0.15);
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.35s ease;
    pointer-events: none;
    max-width: calc(100vw - 48px);
    text-align: center;
}
.toast.toast-enter { opacity: 0; transform: translateX(-50%) translateY(-20px); }
.toast.toast-show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.toast-leave { opacity: 0; transform: translateX(-50%) translateY(-10px); }

/* ===========================
   回到顶部
   =========================== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(14, 165, 233, 0.45);
}

/* ===========================
   响应式 - 增强自适应
   =========================== */
@media (max-width: 1200px) {
    .hero-content { gap: 40px; }
    .hero-title { font-size: 3rem; }
}

@media (max-width: 1024px) {
    .hero-content { grid-template-columns: 1fr; text-align: center; }
    .hero-desc { margin-left: auto; margin-right: auto; }
    .hero-stats { justify-content: center; }
    .hero-actions { justify-content: center; }
    .hero-visual { order: -1; }
    .hero-screenshot { max-width: 600px; margin: 0 auto; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .guide-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr; gap: 40px; }
    .section { padding: 80px 0; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(240, 247, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }

    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1.2rem; }
    .hero-stats { gap: 24px; }
    .section-title { font-size: 2rem; }
    .section { padding: 60px 0; }
    .features-grid { grid-template-columns: 1fr; }
    .guide-steps { grid-template-columns: 1fr; }
    .download-cards { grid-template-columns: 1fr; }
    .footer-links { grid-template-columns: 1fr; gap: 24px; }
    .form-row { grid-template-columns: 1fr; }
    .warning-box { flex-direction: column; }
    .screenshot-tabs { gap: 6px; }
    .tab-btn { padding: 8px 16px; font-size: 0.85rem; }
    .container { padding: 0 16px; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions .btn { width: 100%; }
    .btn-lg { width: 100%; }
    .section { padding: 48px 0; }
    .section-title { font-size: 1.6rem; }
    .section-desc { font-size: 0.95rem; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .feedback-form { padding: 24px; }
    .feature-card { padding: 24px 20px; }
    .step-card { padding: 24px 16px; }
    .nav-content { height: 64px; }
    .hero { padding-top: 64px; }
}