/* ===== 全局 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --cyan: #06b6d4;
    --accent: #f59e0b;
    --bg: #08080f;
    --bg-card: rgba(20, 20, 40, 0.6);
    --bg-card-hover: rgba(30, 30, 55, 0.8);
    --text: #c8cee0;
    --text-muted: #6b7194;
    --text-heading: #eef0ff;
    --border: rgba(99, 102, 241, 0.15);
    --border-glow: rgba(99, 102, 241, 0.35);
    --shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
    --gradient-1: linear-gradient(135deg, #6366f1, #06b6d4);
    --radius: 14px;
    --radius-sm: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== 背景 ===== */
#particle-canvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; pointer-events: none;
}
.scanlines {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 1; pointer-events: none;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.03) 2px, rgba(0,0,0,0.03) 4px);
}
.grid-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; pointer-events: none;
    background-image:
        linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}
body::after {
    content: ''; position: fixed; top: -30%; right: -20%; width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(99,102,241,0.06) 0%, transparent 70%);
    border-radius: 50%; z-index: 0; animation: orbFloat1 25s ease-in-out infinite; pointer-events: none;
}
body::before {
    content: ''; position: fixed; bottom: -20%; left: -15%; width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(6,182,212,0.05) 0%, transparent 70%);
    border-radius: 50%; z-index: 0; animation: orbFloat2 30s ease-in-out infinite; pointer-events: none;
}
@keyframes orbFloat1 {
    0%,100%{transform:translate(0,0) scale(1)} 33%{transform:translate(-40px,60px) scale(1.1)} 66%{transform:translate(30px,-30px) scale(0.95)}
}
@keyframes orbFloat2 {
    0%,100%{transform:translate(0,0) scale(1)} 33%{transform:translate(50px,-40px) scale(1.05)} 66%{transform:translate(-20px,30px) scale(0.9)}
}

/* 流星 */
.meteor {
    position: fixed;
    top: -5%;
    left: 110%;
    width: 1px;
    height: 50px;
    background: linear-gradient(to bottom, rgba(200,200,255,0.6), rgba(200,200,255,0));
    border-radius: 1px;
    z-index: 0;
    pointer-events: none;
    transform: rotate(-35deg);
    opacity: 0;
}
@keyframes meteorFall {
    0% { opacity: 0; }
    2% { opacity: 0.6; }
    60% { opacity: 0.6; }
    100% { opacity: 0; transform: rotate(-35deg) translateX(-1000px); }
}

/* 页面层级 */
.navbar, .page, .footer, .modal-overlay, .hero, .faq-section, .tools-section, .about-section,
.loading-section, .result-section, .history-section { position: relative; z-index: 2; }

/* ===== 导航栏 ===== */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(8,8,15,0.7);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0 16px;
}
.nav-container {
    max-width: 1000px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center; height: 52px;
}
.nav-logo {
    display: flex; align-items: center; gap: 6px;
    text-decoration: none; color: var(--text-heading);
    font-weight: 700; font-size: 1.1rem; transition: text-shadow 0.3s;
}
.nav-logo:hover { text-shadow: 0 0 20px rgba(99,102,241,0.5); }
.logo-icon { font-size: 1.3rem; }
.logo-icon.spinning {
    animation: logoSpin 1.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes logoSpin {
    0% { transform: rotate(0deg) translateY(0); opacity: 1; }
    30% { transform: rotate(360deg) translateY(-20px) scale(1.2); opacity: 0.8; }
    70% { transform: rotate(720deg) translateY(-60px) scale(0.8); opacity: 0.3; }
    100% { transform: rotate(1080deg) translateY(-120px) scale(0); opacity: 0; }
}
.nav-links { display: flex; gap: 4px; }
.nav-link {
    text-decoration: none; color: var(--text-muted);
    padding: 6px 12px; border-radius: 6px; transition: all 0.2s; font-size: 0.85rem;
}
.nav-link:hover { color: var(--text); background: rgba(99,102,241,0.08); }
.nav-link.active { color: var(--primary-light); background: rgba(99,102,241,0.12); }

/* 语言切换 */
.lang-switch {
    position: fixed; top: 14px; right: 16px; z-index: 150;
    background: rgba(20,20,40,0.7); border: 1px solid var(--border);
    border-radius: 6px; padding: 4px 10px;
    font-size: 0.78rem; font-weight: 700; color: var(--text-muted);
    cursor: pointer; transition: all 0.2s; backdrop-filter: blur(8px);
}
.lang-switch:hover { color: var(--primary-light); border-color: var(--border-glow); }

/* ===== 页面切换 ===== */
.page { display: block; }
.page.hidden { display: none; }
.page.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from{opacity:0;transform:translateY(10px)} to{opacity:1;transform:translateY(0)} }

/* ===== Hero ===== */
.hero {
    max-width: 680px; margin: 0 auto;
    padding: 40px 16px 28px; text-align: center;
}
.hero-title {
    font-size: clamp(1.4rem, 4vw, 2rem); font-weight: 800;
    color: var(--text-heading); margin-bottom: 8px; line-height: 1.35;
}
.highlight {
    background: var(--gradient-1); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 20px; }

/* ===== 搜索区 ===== */
.hero-search {
    display: flex; flex-direction: column; gap: 8px;
    max-width: 600px; margin: 0 auto;
}
.overseas-row {
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.overseas-toggle {
    display: flex; align-items: center; gap: 6px;
    font-size: 0.78rem; color: var(--text-muted);
    cursor: pointer; user-select: none;
}
.overseas-toggle input { display: none; }
.toggle-track {
    position: relative; width: 32px; height: 18px;
    background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.08);
    border-radius: 9px; transition: all 0.3s; flex-shrink: 0;
}
.toggle-thumb {
    position: absolute; top: 2px; left: 2px;
    width: 12px; height: 12px; background: #555a7a;
    border-radius: 50%; transition: all 0.3s;
}
.overseas-toggle input:checked + .toggle-track {
    background: rgba(99,102,241,0.15); border-color: rgba(99,102,241,0.3);
}
.overseas-toggle input:checked + .toggle-track .toggle-thumb {
    transform: translateX(14px); background: var(--primary-light);
}
.overseas-hint {
    font-size: 0.68rem; color: var(--text-muted); opacity: 0.6;
}
.question-input {
    width: 100%; padding: 10px 14px; font-size: 0.9rem;
    color: var(--text); background: var(--bg-card);
    border: 1.5px solid var(--border); border-radius: var(--radius);
    resize: vertical; font-family: inherit; line-height: 1.5;
    transition: all 0.3s; outline: none; backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.question-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1), 0 0 20px rgba(99,102,241,0.08);
}
.question-input::placeholder { color: var(--text-muted); }
.analyze-btn {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    padding: 9px 24px; font-size: 0.9rem; font-weight: 600; color: white;
    background: var(--gradient-1); border: none; border-radius: var(--radius-sm);
    cursor: pointer; transition: all 0.3s; font-family: inherit; align-self: center;
    position: relative; overflow: hidden;
}
.analyze-btn::before {
    content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s;
}
.analyze-btn:hover::before { left: 100%; }
.analyze-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(99,102,241,0.4); }
.analyze-btn:active { transform: translateY(0); }
.analyze-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-icon { font-size: 1rem; }
.error-msg { color: #ef4444; font-size: 0.78rem; min-height: 16px; margin-top: 2px; }

/* ===== 加载 ===== */
.loading-section {
    display: flex; justify-content: center; align-items: center; padding: 32px 16px;
}
.loading-section.hidden { display: none; }
.loader { text-align: center; }
.loader-ring {
    width: 40px; height: 40px; margin: 0 auto 12px; position: relative;
}
.loader-ring div {
    position: absolute; inset: 0; border-radius: 50%; border: 2px solid transparent;
}
.loader-ring div:nth-child(1) { border-top-color: var(--primary); animation: ringSpin 1.2s linear infinite; }
.loader-ring div:nth-child(2) { border-right-color: var(--cyan); animation: ringSpin 1.6s linear infinite reverse; inset: 4px; }
.loader-ring div:nth-child(3) { border-bottom-color: var(--accent); animation: ringSpin 2s linear infinite; inset: 8px; }
@keyframes ringSpin { to { transform: rotate(360deg); } }
.loader-text { font-size: 0.95rem; font-weight: 600; color: var(--text-heading); margin-bottom: 4px; }
.loader-hint { color: var(--text-muted); font-size: 0.8rem; }

/* ===== 结果 ===== */
.result-section {
    max-width: 720px; margin: 0 auto; padding: 16px 16px 40px;
}
.result-section.hidden { display: none; }
.result-header { text-align: center; margin-bottom: 14px; }
.result-title { font-size: 1.2rem; font-weight: 700; color: var(--text-heading); margin-bottom: 8px; }
.result-question-label { color: var(--text-muted); font-size: 0.75rem; margin-bottom: 4px; }
.result-question-text {
    font-size: 0.9rem; color: var(--text); background: var(--bg-card);
    padding: 8px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border);
    line-height: 1.5; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}

/* AI 分析总结 */
.analysis-summary {
    margin-bottom: 14px; padding: 10px 14px;
    background: rgba(99,102,241,0.06); border: 1px solid rgba(99,102,241,0.15);
    border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--text);
    line-height: 1.6; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.analysis-summary h3 { font-size: 0.85rem; font-weight: 600; color: var(--primary-light); margin-bottom: 4px; }

/* ===== 推荐卡片 ===== */
.recommendations {
    display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px;
}
.rec-card {
    padding: 14px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); transition: all 0.3s;
    animation: slideUp 0.4s ease forwards; opacity: 0; transform: translateY(10px);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    position: relative; overflow: hidden;
}
.rec-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-light), var(--cyan), transparent); opacity: 0.5;
}
.rec-card::after {
    content: ''; position: absolute; inset: 0; border-radius: var(--radius); padding: 1px;
    background: linear-gradient(135deg, rgba(99,102,241,0.1), transparent, rgba(6,182,212,0.1));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none;
}
.rec-card:nth-child(1) { animation-delay: 0.1s; }
.rec-card:nth-child(2) { animation-delay: 0.2s; }
.rec-card:nth-child(3) { animation-delay: 0.3s; }
@keyframes slideUp { to { opacity: 1; transform: translateY(0); } }
.rec-card:hover {
    background: var(--bg-card-hover); border-color: var(--border-glow);
    transform: translateY(-1px); box-shadow: var(--shadow), 0 0 30px rgba(99,102,241,0.08);
}
.rec-top { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.rec-rank {
    flex-shrink: 0; width: 28px; height: 28px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 6px; font-size: 0.9rem; font-weight: 800; color: white;
}
.rec-rank.gold { background: linear-gradient(135deg, #f59e0b, #d97706); }
.rec-rank.silver { background: linear-gradient(135deg, #94a3b8, #64748b); }
.rec-rank.bronze { background: linear-gradient(135deg, #d97706, #92400e); }
.rec-name {
    font-size: 0.95rem; font-weight: 700; color: var(--text-heading);
    display: flex; align-items: center; gap: 6px;
}
.rec-match-badge {
    font-size: 0.68rem; font-weight: 600; color: var(--cyan);
    background: rgba(6,182,212,0.1); padding: 2px 6px; border-radius: 8px;
    border: 1px solid rgba(6,182,212,0.15);
}
.rec-no1-badge {
    font-size: 0.65rem; font-weight: 700; color: #fff;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    padding: 2px 8px; border-radius: 10px;
    border: 1px solid rgba(245,158,11,0.4);
    animation: pulseBadge 2s ease-in-out infinite;
    letter-spacing: 0.5px;
}
@keyframes pulseBadge {
    0%,100% { box-shadow: 0 0 4px rgba(245,158,11,0.3); }
    50% { box-shadow: 0 0 12px rgba(245,158,11,0.6); }
}
.rec-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 5px; }
.rec-tag {
    font-size: 0.65rem; padding: 2px 6px; border-radius: 10px;
    background: rgba(99,102,241,0.1); color: var(--primary-light);
    border: 1px solid rgba(99,102,241,0.12);
}
.rec-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 6px; }
.rec-match-bar { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.match-score { font-size: 0.72rem; font-weight: 600; color: var(--cyan); white-space: nowrap; }
.match-bar-bg {
    flex: 1; height: 4px; background: rgba(255,255,255,0.04);
    border-radius: 2px; overflow: hidden;
}
.match-bar {
    height: 100%; background: var(--gradient-1); border-radius: 2px;
    transition: width 0.8s ease; box-shadow: 0 0 8px rgba(99,102,241,0.3);
}

/* 提示词区域 */
.prompt-section { border-top: 1px solid var(--border); padding-top: 8px; }
.prompt-label {
    font-size: 0.72rem; font-weight: 600; color: var(--accent);
    margin-bottom: 4px; display: flex; align-items: center; gap: 4px;
}
.prompt-box {
    position: relative; background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.04); border-radius: 6px;
    padding: 8px 10px; font-size: 0.78rem; color: var(--text);
    line-height: 1.5; max-height: 100px; overflow-y: auto;
    word-break: break-word; font-family: 'SF Mono','Fira Code',monospace;
}
.prompt-box::-webkit-scrollbar { width: 3px; }
.prompt-box::-webkit-scrollbar-track { background: transparent; }
.prompt-box::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
.copy-btn-inline {
    display: inline-flex; align-items: center; gap: 3px;
    padding: 3px 10px; font-size: 0.7rem; font-weight: 600;
    color: var(--text-muted); background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.08); border-radius: 4px;
    cursor: pointer; transition: all 0.2s; font-family: inherit;
    float: right; margin-top: -2px;
}
.copy-btn-inline:hover { background: rgba(99,102,241,0.2); color: var(--primary-light); }
.rec-action-row {
    display: flex; align-items: center; gap: 8px; margin-top: 8px;
}
.rec-use-btn {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 4px 12px; font-size: 0.72rem; font-weight: 600;
    color: white; background: var(--primary); border: none;
    border-radius: 6px; cursor: pointer; transition: all 0.2s;
    font-family: inherit; text-decoration: none;
}
.rec-use-btn:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99,102,241,0.3); }

/* ===== 操作按钮 ===== */
.result-actions { text-align: center; }
.try-another-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 9px 20px; font-size: 0.82rem; font-weight: 600;
    color: var(--text); background: var(--bg-card);
    border: 1.5px solid var(--border); border-radius: var(--radius-sm);
    cursor: pointer; transition: all 0.3s; font-family: inherit;
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.try-another-btn:hover { border-color: var(--primary); color: var(--primary-light); background: rgba(99,102,241,0.06); }

/* ===== 常见问题 ===== */
.faq-section { max-width: 800px; margin: 0 auto; padding: 16px 16px 40px; }
.faq-title { text-align: center; font-size: 1.05rem; font-weight: 700; color: var(--text-heading); margin-bottom: 14px; }
.faq-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 8px; }
.faq-card {
    padding: 10px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm); cursor: pointer; transition: all 0.3s;
    display: flex; align-items: center; gap: 8px; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.faq-card:hover { background: var(--bg-card-hover); border-color: var(--border-glow); transform: translateY(-1px); box-shadow: var(--shadow); }
.faq-icon { font-size: 1.2rem; flex-shrink: 0; }
.faq-card p { font-size: 0.8rem; color: var(--text); line-height: 1.4; }

/* ===== 工具分类 ===== */
.tools-section { max-width: 800px; margin: 0 auto; padding: 0 16px 40px; }
.tools-title { text-align: center; font-size: 1.05rem; font-weight: 700; color: var(--text-heading); margin-bottom: 14px; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.tool-category {
    padding: 14px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); text-align: center; transition: all 0.3s;
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    position: relative; overflow: hidden;
}
.tool-category::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-glow), transparent); opacity: 0; transition: opacity 0.3s;
}
.tool-category:hover::before { opacity: 1; }
.tool-category:hover { border-color: var(--border-glow); transform: translateY(-2px); box-shadow: var(--shadow); }
.tool-icon { font-size: 1.8rem; margin-bottom: 6px; }
.tool-category h3 { font-size: 0.88rem; font-weight: 600; color: var(--text-heading); margin-bottom: 4px; }
.tool-category p { font-size: 0.78rem; color: var(--text-muted); }

/* ===== 历史记录 ===== */
.history-section.hidden { display: none; }
.history-section { max-width: 720px; margin: 0 auto; padding: 32px 16px 60px; }
.history-title { text-align: center; font-size: 1.3rem; font-weight: 700; color: var(--text-heading); margin-bottom: 20px; }
.history-item {
    padding: 12px 16px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm); margin-bottom: 8px; cursor: pointer;
    transition: all 0.2s; backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.history-item:hover { background: var(--bg-card-hover); border-color: var(--border-glow); }
.history-item-question { font-size: 0.85rem; color: var(--text); margin-bottom: 4px; line-height: 1.4; }
.history-item-time { font-size: 0.7rem; color: var(--text-muted); }
.history-empty { text-align: center; color: var(--text-muted); font-size: 0.9rem; padding: 40px 0; }
.history-actions { text-align: center; margin-top: 16px; }
.clear-history-btn {
    padding: 8px 18px; font-size: 0.8rem; font-weight: 600;
    color: var(--text-muted); background: transparent;
    border: 1px solid rgba(239,68,68,0.3); border-radius: var(--radius-sm);
    cursor: pointer; transition: all 0.2s; font-family: inherit;
}
.clear-history-btn:hover { color: #ef4444; border-color: #ef4444; background: rgba(239,68,68,0.08); }

/* ===== 关于页 ===== */
.about-section { max-width: 760px; margin: 0 auto; padding: 32px 16px 60px; }
.about-title { text-align: center; font-size: 1.35rem; font-weight: 800; color: var(--text-heading); margin-bottom: 20px; }
.about-content { display: flex; flex-direction: column; gap: 14px; }
.about-card {
    padding: 16px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.about-card h2 { font-size: 0.95rem; font-weight: 700; color: var(--text-heading); margin-bottom: 8px; }
.about-card p { color: var(--text-muted); line-height: 1.6; font-size: 0.85rem; }
.ai-tools-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.ai-tool-item {
    display: flex; align-items: flex-start; gap: 8px;
    padding: 8px; background: rgba(255,255,255,0.01);
    border-radius: var(--radius-sm); border: 1px solid rgba(255,255,255,0.03);
}
.ai-tool-icon { font-size: 1.2rem; flex-shrink: 0; }
.ai-tool-item strong { color: var(--text-heading); font-size: 0.85rem; }
.ai-tool-item p { color: var(--text-muted); font-size: 0.78rem; margin-top: 2px; }

/* ===== 弹窗 ===== */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    z-index: 200; display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal-overlay.hidden { display: none; }
.modal-content {
    background: rgba(20,20,40,0.9); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px; max-width: 460px; width: 100%;
    max-height: 80vh; overflow-y: auto; animation: modalIn 0.3s ease;
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); position: relative;
}
.modal-content::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-light), transparent); opacity: 0.6;
}
@keyframes modalIn { from{opacity:0;transform:scale(0.95) translateY(10px)} to{opacity:1;transform:scale(1) translateY(0)} }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-header h2 { font-size: 1rem; font-weight: 700; color: var(--text-heading); }
.modal-close {
    background: none; border: none; color: var(--text-muted); font-size: 1.1rem;
    cursor: pointer; padding: 4px 8px; border-radius: 4px; transition: all 0.2s;
}
.modal-close:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 0.78rem; font-weight: 600; color: var(--text-muted); margin-bottom: 5px; }
.form-group select, .form-group input {
    width: 100%; padding: 8px 10px; font-size: 0.85rem; color: var(--text);
    background: rgba(0,0,0,0.25); border: 1.5px solid var(--border);
    border-radius: 6px; font-family: inherit; outline: none; transition: border-color 0.2s;
}
.form-group select:focus, .form-group input:focus { border-color: var(--primary); }
.contact-textarea {
    width: 100%; padding: 8px 10px; font-size: 0.85rem; color: var(--text);
    background: rgba(0,0,0,0.25); border: 1.5px solid var(--border);
    border-radius: 6px; font-family: inherit; resize: vertical; outline: none; transition: border-color 0.2s;
}
.contact-textarea:focus { border-color: var(--primary); }
.submit-contact-btn {
    width: 100%; padding: 9px; font-size: 0.85rem; font-weight: 600; color: white;
    background: var(--gradient-1); border: none; border-radius: 6px;
    cursor: pointer; transition: all 0.3s; font-family: inherit; margin-top: 4px;
}
.submit-contact-btn:hover { box-shadow: 0 4px 16px rgba(99,102,241,0.35); }
.contact-success { text-align: center; padding: 12px; color: #34d399; font-size: 0.85rem; font-weight: 600; }
.contact-success.hidden { display: none; }
.contact-email { margin-top: 12px; text-align: center; font-size: 0.8rem; color: var(--text-muted); }
.email-link { color: var(--primary-light); text-decoration: underline; }

/* ===== 页脚 ===== */
.footer {
    text-align: center; padding: 20px 16px; border-top: 1px solid var(--border);
    color: var(--text-muted); font-size: 0.78rem; position: relative; z-index: 2;
}
.footer::before {
    content: ''; position: absolute; top: 0; left: 10%; right: 10%; height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-glow), transparent);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .hero { padding: 28px 12px 20px; }
    .hero-title { font-size: 1.3rem; }
    .hero-subtitle { font-size: 0.82rem; }
    .question-input { padding: 9px 12px; font-size: 0.85rem; }
    .analyze-btn { padding: 8px 20px; font-size: 0.82rem; }
    .faq-grid { grid-template-columns: 1fr; }
    .tools-grid { grid-template-columns: 1fr; }
    .modal-content { padding: 16px; }
}
@media (max-width: 480px) {
    .nav-container { height: 48px; }
    .nav-links { gap: 0; }
    .nav-link { padding: 5px 8px; font-size: 0.75rem; }
    .nav-logo .logo-text { font-size: 0.9rem; }
    .hero { padding: 20px 10px 16px; }
    .hero-title { font-size: 1.15rem; }
    .overseas-toggle { font-size: 0.72rem; }
    .lang-switch { top: 10px; right: 10px; font-size: 0.72rem; padding: 3px 8px; }
}