/* ============================================
   AI创作平台 - 主样式表
   深色主题，蓝紫渐变风格
   ============================================ */

/* --- CSS变量 / 设计令牌 --- */
:root {
    /* 主色调 */
    --color-primary: #4f6ef6;
    --color-primary-light: #7b93fa;
    --color-primary-dark: #3451d1;
    --color-accent: #a855f7;
    --color-accent-light: #c084fc;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #4f6ef6, #a855f7);
    --gradient-hero: linear-gradient(135deg, #1e1b4b 0%, #0f172a 50%, #1a0a2e 100%);
    --gradient-card: linear-gradient(180deg, rgba(79, 110, 246, 0.08) 0%, rgba(168, 85, 247, 0.04) 100%);
    --gradient-btn: linear-gradient(135deg, #4f6ef6, #7b93fa);
    --gradient-btn-hover: linear-gradient(135deg, #637ef7, #8da1fb);

    /* 背景色 */
    --bg-primary: #0a0a14;
    --bg-secondary: #111122;
    --bg-card: #15152a;
    --bg-card-hover: #1c1c3a;
    --bg-input: #1a1a30;

    /* 边框 */
    --border-color: rgba(255, 255, 255, 0.06);
    --border-color-light: rgba(255, 255, 255, 0.1);

    /* 文字 */
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --text-muted: #6b6b8a;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(79, 110, 246, 0.2);

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 间距 */
    --gap-xs: 8px;
    --gap-sm: 12px;
    --gap-md: 16px;
    --gap-lg: 24px;
    --gap-xl: 32px;
    --gap-2xl: 48px;
    --gap-3xl: 64px;

    /* 容器宽度 */
    --container-max: 1200px;
    --container-narrow: 900px;

    /* 过渡 */
    --transition: 0.25s ease;
    --transition-slow: 0.35s ease;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

html {
    font-size: 16px;
    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);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- 背景装饰光效 --- */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(79, 110, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 60%, rgba(168, 85, 247, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(79, 110, 246, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

main {
    position: relative;
    z-index: 1;
}

/* --- 容器 --- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--gap-lg);
}

.container-narrow {
    max-width: var(--container-narrow);
}

/* --- 按钮 --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-xs);
    padding: 10px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    white-space: nowrap;
    line-height: 1.4;
}

.btn-sm {
    padding: 7px 18px;
    font-size: 0.85rem;
    border-radius: 6px;
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

.btn-primary {
    background: var(--gradient-btn);
    color: #fff;
    box-shadow: 0 2px 12px rgba(79, 110, 246, 0.3);
}

.btn-primary:hover {
    background: var(--gradient-btn-hover);
    box-shadow: 0 4px 20px rgba(79, 110, 246, 0.45);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color-light);
}

.btn-outline:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary-light);
    background: rgba(79, 110, 246, 0.06);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.btn-white {
    background: #fff;
    color: var(--bg-primary);
}

.btn-white:hover {
    background: #e2e2f0;
    transform: translateY(-1px);
}

/* ============================================
   顶部导航栏
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 20, 0.85);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--gap-xs);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.logo-icon {
    font-size: 1.4rem;
}

.nav-desktop {
    display: flex;
    align-items: center;
    gap: var(--gap-xs);
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.04);
}

.nav-link.active {
    color: var(--color-primary-light);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--gap-sm);
    flex-shrink: 0;
}

/* 已登录用户信息区 */
.header-user-area { display: flex; align-items: center; gap: 12px; }
.header-user-avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-size: 0.8rem; color: #fff; font-weight: 600; overflow: hidden; flex-shrink: 0; cursor: pointer; }
.header-user-avatar img { width: 100%; height: 100%; object-fit: cover; }
.header-user-name { font-size: 0.84rem; font-weight: 500; color: #fff; cursor: pointer; white-space: nowrap; }
.header-user-credits { font-size: 0.76rem; color: var(--color-accent-light); font-weight: 600; background: rgba(168,85,247,0.1); padding: 3px 10px; border-radius: 10px; white-space: nowrap; }
.header-user-dropdown { position: absolute; top: 100%; right: 0; min-width: 160px; background: #15152a; border: 1px solid rgba(255,255,255,0.08); border-radius: 10px; padding: 4px; z-index: 400; box-shadow: 0 8px 28px rgba(0,0,0,0.5); display: none; }
.header-user-dropdown.show { display: block; }
.header-user-area { position: relative; }
.header-user-dropdown { position: absolute; top: calc(100% + 8px); right: 0; width: 280px; background: #15152a; border: 1px solid rgba(255,255,255,0.1); border-radius: 14px; padding: 8px; z-index: 400; box-shadow: 0 12px 40px rgba(0,0,0,0.6); display: none; }
.header-user-dropdown.show { display: block; }

.hd-user-info { display: flex; align-items: center; gap: 12px; padding: 10px 12px 14px; }
.hd-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--gradient-primary); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: #fff; font-weight: 600; flex-shrink: 0; overflow: hidden; }
.hd-avatar img { width: 100%; height: 100%; object-fit: cover; }
.hd-name { font-size: 0.9rem; font-weight: 600; color: #fff; }
.hd-email { font-size: 0.76rem; color: #6b6b8a; margin-top: 2px; }

.hd-divider { height: 1px; background: rgba(255,255,255,0.05); margin: 4px 8px; }

.hd-row { display: flex; align-items: center; justify-content: space-between; padding: 6px 12px; font-size: 0.78rem; color: #6b6b8a; }
.hd-row span:first-child { color: #6b6b8a; }

.hd-copy-btn { width: 26px; height: 26px; border-radius: 5px; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); color: #6b6b8a; cursor: pointer; font-size: 0.7rem; display: flex; align-items: center; justify-content: center; margin-left: 4px; transition: all var(--transition); }
.hd-copy-btn:hover { background: rgba(79,110,246,0.15); color: var(--color-primary-light); border-color: rgba(79,110,246,0.3); }
.hd-copy-btn.copied { background: rgba(34,197,94,0.15); color: #4ade80; border-color: rgba(34,197,94,0.3); }

.header-user-dropdown a { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 6px; font-size: 0.84rem; color: #a0a0c0; text-decoration: none; transition: all var(--transition); }
.header-user-dropdown a:hover { background: rgba(255,255,255,0.04); color: #fff; }
.header-user-dropdown .hd-logout { color: #ef4444; }
.header-user-dropdown .hd-logout:hover { background: rgba(239,68,68,0.08); }

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 110;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* 移动端侧边菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    z-index: 200;
    transition: right var(--transition-slow);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
}

.mobile-menu.open {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--gap-lg);
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu-close {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.mobile-menu-close:hover {
    background: rgba(255, 255, 255, 0.06);
}

.nav-mobile {
    display: flex;
    flex-direction: column;
    padding: var(--gap-md);
}

.nav-mobile .nav-link {
    padding: 12px 16px;
    font-size: 0.95rem;
}

.mobile-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: var(--gap-sm) 0;
}

/* 遮罩层 */
.mobile-menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
}

.mobile-menu-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   首页 - 英雄区域
   ============================================ */
.hero {
    padding: 80px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(79, 110, 246, 0.1);
    border: 1px solid rgba(79, 110, 246, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--color-primary-light);
    margin-bottom: var(--gap-xl);
}

.hero-badge-dot {
    width: 7px;
    height: 7px;
    background: #4ade80;
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--gap-lg);
    letter-spacing: -0.02em;
}

.hero-title .gradient-text {
    background: linear-gradient(135deg, #7b93fa, #c084fc, #7b93fa);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 4s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 100% center; }
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--gap-2xl);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-md);
    flex-wrap: wrap;
}

/* ============================================
   功能卡片区域
   ============================================ */
.tools-section {
    padding: 80px 0 100px;
}

.section-header {
    text-align: center;
    margin-bottom: var(--gap-3xl);
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: var(--gap-md);
    letter-spacing: -0.01em;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-lg);
}

.tool-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--gap-2xl) var(--gap-xl);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-slow);
    overflow: hidden;
    cursor: pointer;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-card);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.tool-card:hover {
    border-color: rgba(79, 110, 246, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

.tool-card-inner {
    position: relative;
    z-index: 1;
}

.tool-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: var(--gap-lg);
}

.tool-card-icon.blue {
    background: rgba(79, 110, 246, 0.12);
}

.tool-card-icon.purple {
    background: rgba(168, 85, 247, 0.12);
}

.tool-card-icon.green {
    background: rgba(34, 197, 94, 0.12);
}

.tool-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--gap-sm);
}

.tool-card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--gap-lg);
}

.tool-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap-xs);
    margin-bottom: var(--gap-lg);
}

.tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.tool-card-arrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-primary-light);
    transition: gap var(--transition);
}

.tool-card:hover .tool-card-arrow {
    gap: 10px;
}

/* ============================================
   展示区域
   ============================================ */
.showcase-section {
    padding: 80px 0 100px;
    background: rgba(255, 255, 255, 0.01);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-md);
}

.showcase-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition-slow);
    cursor: pointer;
}

.showcase-item:hover {
    border-color: rgba(79, 110, 246, 0.4);
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

.showcase-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    background: var(--gradient-card);
}

.showcase-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--gap-md);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    transform: translateY(100%);
    transition: transform var(--transition-slow);
}

.showcase-item:hover .showcase-overlay {
    transform: translateY(0);
}

.showcase-overlay span {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
    padding: 100px 0;
    text-align: center;
}

.cta-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--gap-3xl);
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(79, 110, 246, 0.1), transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--gap-md);
    position: relative;
}

.cta-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: var(--gap-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: var(--gap-2xl);
    margin-bottom: var(--gap-xl);
    position: relative;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--gap-xs);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.cta-feature .check-icon {
    color: #4ade80;
    font-size: 1.1rem;
}

/* ============================================
   工作流程区域
   ============================================ */
.steps-section {
    padding: 80px 0 100px;
    border-top: 1px solid var(--border-color);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--gap-xl);
}

.step-card {
    text-align: center;
    padding: var(--gap-xl);
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0 auto var(--gap-lg);
}

.step-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--gap-sm);
}

.step-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap-xl);
    margin-bottom: var(--gap-2xl);
}

.footer-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--gap-md);
    color: var(--text-primary);
}

.footer-link {
    display: block;
    padding: 4px 0;
    font-size: 0.88rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-link:hover {
    color: var(--text-primary);
}

.footer-text {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: var(--gap-md);
}

.footer-social {
    display: flex;
    gap: var(--gap-sm);
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.04);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all var(--transition);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

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

/* ============================================
   通用页面头部（子页面使用）
   ============================================ */
.page-hero {
    padding: 60px 0 40px;
    text-align: center;
}

.page-hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--gap-md);
}

.page-hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin: 0 auto;
}

/* ============================================
   表单组件（登录/注册预留）
   ============================================ */
.form-container {
    max-width: 440px;
    margin: 40px auto;
    padding: var(--gap-2xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.form-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--gap-xs);
    text-align: center;
}

.form-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--gap-xl);
    text-align: center;
}

.form-group {
    margin-bottom: var(--gap-md);
}

.form-label {
    display: block;
    font-size: 0.88rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 11px 15px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: border-color var(--transition);
    outline: none;
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 110, 246, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-footer {
    text-align: center;
    margin-top: var(--gap-lg);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.form-footer a {
    color: var(--color-primary-light);
    text-decoration: none;
}

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

.form-btn {
    width: 100%;
    margin-top: var(--gap-sm);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

@media (max-width: 768px) {
    .header-inner {
        height: 56px;
    }

    .nav-desktop {
        display: none;
    }

    .header-actions {
        display: none;
    }

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

    .hero {
        padding: 50px 0 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

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

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

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

    .section-title {
        font-size: 1.6rem;
    }

    .cta-box {
        padding: var(--gap-xl) var(--gap-lg);
    }

    .cta-features {
        flex-direction: column;
        align-items: center;
        gap: var(--gap-md);
    }

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

    .page-hero-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

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

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

/* ============================================
   统一弹窗系统 — 居中弹出 + 右下确认按钮
   ============================================ */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal-overlay.show { opacity: 1; visibility: visible; }

.modal-dialog {
    background: #15152a;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    width: 480px; max-width: 94vw; max-height: 85vh;
    display: flex; flex-direction: column;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
    animation: modalIn 0.25s ease;
    overflow: hidden;
}
.modal-dialog.wide { width: 720px; }
.modal-dialog.small { width: 380px; }

@keyframes modalIn {
    from { opacity: 0; transform: translateY(-20px) scale(0.96); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* 弹窗头部 */
.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 22px; flex-shrink: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.modal-title {
    font-size: 1.05rem; font-weight: 700;
    display: flex; align-items: center; gap: 8px;
}
.modal-close {
    width: 32px; height: 32px; border-radius: 50%;
    background: rgba(255, 255, 255, 0.04); border: none;
    color: #6b6b8a; cursor: pointer; font-size: 1rem;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s; flex-shrink: 0;
}
.modal-close:hover { background: rgba(255, 255, 255, 0.1); color: #fff; }

/* 弹窗内容（可滚动） */
.modal-body {
    padding: 22px; overflow-y: auto; flex: 1;
}
.modal-body.no-padding { padding: 0; }

/* 弹窗底部 — 右对齐的确认/取消按钮 */
.modal-footer {
    display: flex; align-items: center; justify-content: flex-end;
    gap: 10px; padding: 14px 22px; flex-shrink: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* 弹窗按钮 */
.modal-btn-cancel {
    padding: 9px 22px; background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08); border-radius: 8px;
    color: #a0a0c0; cursor: pointer; font-size: 0.85rem;
    font-family: inherit; transition: all 0.2s;
}
.modal-btn-cancel:hover { background: rgba(255, 255, 255, 0.08); color: #fff; }

.modal-btn-confirm {
    padding: 9px 28px; background: var(--gradient-primary, linear-gradient(135deg, #4f6ef6, #7c5cf6));
    border: none; border-radius: 8px; color: #fff; font-weight: 600;
    cursor: pointer; font-size: 0.85rem; font-family: inherit;
    transition: all 0.2s; white-space: nowrap;
}
.modal-btn-confirm:hover { box-shadow: 0 4px 18px rgba(79, 110, 246, 0.4); transform: translateY(-1px); }
.modal-btn-confirm:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }

/* 弹窗内表单 */
.modal-body .form-group { margin-bottom: 14px; }
.modal-body .form-label { display: block; font-size: 0.8rem; font-weight: 600; color: #6b6b8a; margin-bottom: 5px; text-transform: uppercase; letter-spacing: 0.5px; }
.modal-body .form-input,
.modal-body .form-select,
.modal-body .form-textarea {
    width: 100%; padding: 10px 14px;
    background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px; color: #fff; font-size: 0.88rem;
    font-family: inherit; outline: none; transition: border-color 0.2s;
}
.modal-body .form-input:focus,
.modal-body .form-select:focus,
.modal-body .form-textarea:focus { border-color: var(--color-primary); }
.modal-body .form-textarea { resize: vertical; min-height: 80px; line-height: 1.6; }

/* 弹窗内错误提示 */
.modal-error {
    background: rgba(239, 68, 68, 0.08); color: #ef4444;
    font-size: 0.8rem; padding: 8px 12px; border-radius: 6px;
    margin-bottom: 12px; text-align: center; display: none;
}

/* ============================================
   登录弹窗（基于统一弹窗）
   ============================================ */
.auth-modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.7); backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden;
    transition: all 0.25s ease;
}
.auth-modal-overlay.show { opacity: 1; visibility: visible; }

.auth-modal-card {
    background: #15152a;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 28px;
    width: 420px; max-width: 94vw;
    box-shadow: 0 24px 64px rgba(0,0,0,0.6);
    position: relative;
    animation: modalIn 0.25s ease;
}

.auth-modal-close {
    position: absolute; top: 14px; right: 16px;
    width: 30px; height: 30px; border-radius: 50%;
    background: rgba(255,255,255,0.04); border: none;
    color: #6b6b8a; cursor: pointer; font-size: 1rem;
    display: flex; align-items: center; justify-content: center;
    transition: all var(--transition);
}
.auth-modal-close:hover { background: rgba(255,255,255,0.08); color: #fff; }

.auth-modal-title {
    font-size: 1.15rem; font-weight: 700; text-align: center; margin-bottom: 4px;
}
.auth-modal-sub {
    font-size: 0.82rem; color: #6b6b8a; text-align: center; margin-bottom: 20px;
}

.auth-modal-card .form-group { margin-bottom: 14px; }
.auth-modal-card .form-label { display: block; font-size: 0.8rem; color: #6b6b8a; margin-bottom: 5px; }
.auth-modal-card .form-input {
    width: 100%; padding: 11px 14px;
    background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
    border-radius: 8px; color: #fff; font-size: 0.9rem;
    font-family: inherit; outline: none; box-sizing: border-box;
    transition: border-color var(--transition);
}
.auth-modal-card .form-input:focus { border-color: var(--color-primary); }

.auth-modal-card .auth-error {
    background: rgba(239,68,68,0.08); color: #ef4444;
    font-size: 0.8rem; padding: 8px 12px; border-radius: 6px;
    margin-bottom: 12px; text-align: center; display: none;
}

.auth-btn {
    width: 100%; padding: 12px;
    background: var(--gradient-primary); color: #fff;
    border: none; border-radius: 8px; font-size: 0.95rem;
    font-weight: 600; cursor: pointer; font-family: inherit;
    transition: all var(--transition); margin-top: 6px;
}
.auth-btn:hover { box-shadow: 0 4px 18px rgba(79,110,246,0.4); }
.auth-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.auth-modal-card .auth-footer {
    text-align: center; margin-top: 14px;
    font-size: 0.8rem; color: #6b6b8a;
}
.auth-modal-card .auth-footer a { color: var(--color-primary-light); text-decoration: none; }
.auth-modal-card .auth-footer a:hover { text-decoration: underline; }

.auth-tabs { display: flex; gap: 0; margin-bottom: 18px; background: rgba(255,255,255,0.03); border-radius: 8px; padding: 3px; }
.auth-tab { flex: 1; padding: 10px; text-align: center; border: none; border-radius: 6px; font-size: 0.86rem; cursor: pointer; transition: all var(--transition); font-family: inherit; background: transparent; color: #6b6b8a; }
.auth-tab.active { background: var(--color-primary); color: #fff; }

/* ============================================
   工具类
   ============================================ */
.text-center { text-align: center; }
.text-gradient {
    background: linear-gradient(135deg, #7b93fa, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.mt-sm { margin-top: var(--gap-sm); }
.mt-md { margin-top: var(--gap-md); }
.mt-lg { margin-top: var(--gap-lg); }
.mt-xl { margin-top: var(--gap-xl); }
.mb-sm { margin-bottom: var(--gap-sm); }
.mb-md { margin-bottom: var(--gap-md); }
.mb-lg { margin-bottom: var(--gap-lg); }
.mb-xl { margin-bottom: var(--gap-xl); }