/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-primary: #fafafa;
    --bg-secondary: #f0f1f3;
    --bg-dark: #0a0f1a;
    --bg-dark-card: #111827;
    --bg-card: #ffffff;
    --bg-card-hover: #f5f5f5;
    --accent: #165dff;
    --accent-lime: #c8ff00;
    --accent-dim: rgba(22, 93, 255, 0.08);
    --accent-glow: rgba(22, 93, 255, 0.15);
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --text-dark-primary: #f9fafb;
    --text-dark-secondary: #d1d5db;
    --text-dark-muted: #6b7280;
    --border: #e5e7eb;
    --border-dark: rgba(255,255,255,0.08);
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #22c55e;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: #0e42d2; }

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

/* ========== Particle Canvas ========== */
#particle-canvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; pointer-events: none; opacity: 0.4;
}

/* ========== Navigation ========== */
.navbar {
    position: fixed; top: 0; width: 100%; z-index: 100;
    padding: 16px 0; transition: var(--transition);
}
.navbar.scrolled {
    padding: 8px 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; height: 56px;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.3rem; font-weight: 700; color: var(--text-primary); letter-spacing: -0.5px;
}
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
    color: var(--text-secondary); font-size: 0.88rem; font-weight: 500;
    padding: 6px 0; position: relative; transition: var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a::after {
    content: ''; position: absolute; bottom: 0; left: 0;
    width: 0; height: 2px; background: var(--accent); transition: width 0.3s ease;
}
.nav-links a:hover::after { width: 100%; }
.nav-cta {
    background: var(--accent) !important; color: white !important;
    padding: 10px 24px !important; border-radius: 8px;
    font-weight: 600 !important; font-size: 0.88rem !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: #0e42d2 !important; transform: translateY(-1px); color: white !important; }
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.mobile-toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); margin: 5px 0; transition: var(--transition); }

/* ========== Buttons ========== */
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--accent); color: white; padding: 14px 32px; border-radius: 10px;
    font-size: 0.95rem; font-weight: 600; border: none; cursor: pointer;
    transition: var(--transition); text-decoration: none;
}
.btn-primary:hover { background: #0e42d2; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(22,93,255,0.25); color: white; }

.btn-secondary {
    display: inline-flex; align-items: center; gap: 8px;
    background: transparent; color: var(--text-primary); padding: 14px 32px; border-radius: 10px;
    font-size: 0.95rem; font-weight: 600; border: 1px solid var(--border);
    cursor: pointer; transition: var(--transition); text-decoration: none;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.btn-outline-light {
    display: inline-flex; align-items: center; gap: 8px;
    background: transparent; color: white; padding: 14px 32px; border-radius: 10px;
    font-size: 0.95rem; font-weight: 600; border: 1px solid rgba(255,255,255,0.2);
    cursor: pointer; transition: var(--transition); text-decoration: none;
}
.btn-outline-light:hover { border-color: var(--accent-lime); color: var(--accent-lime); }

/* ========== Hero ========== */
.hero {
    position: relative; z-index: 1; min-height: 100vh;
    display: flex; align-items: center; padding: 120px 24px 80px; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -200px; right: -200px;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(22,93,255,0.04), transparent 70%); border-radius: 50%;
}
.hero .container { position: relative; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--accent-dim); border: 1px solid rgba(22,93,255,0.15);
    padding: 6px 16px; border-radius: 100px; font-size: 0.82rem;
    color: var(--accent); margin-bottom: 28px; animation: fadeInUp 0.8s ease;
}
.hero-badge .pulse { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; animation: pulse 2s infinite; }
.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.8rem); font-weight: 800;
    line-height: 1.12; letter-spacing: -1.5px; margin-bottom: 20px;
    animation: fadeInUp 0.8s ease 0.1s both;
}
.hero-title .highlight {
    background: linear-gradient(135deg, var(--accent), #7c5bff);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
    font-size: 1.1rem; color: var(--text-secondary); max-width: 560px;
    margin-bottom: 36px; line-height: 1.7; animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-tags {
    display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.3s both;
}
.hero-tag { display: flex; align-items: center; gap: 6px; font-size: 0.88rem; color: var(--text-secondary); }
.hero-tag .tag-icon {
    width: 20px; height: 20px; background: var(--accent-dim);
    border-radius: 6px; display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; color: var(--accent);
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; animation: fadeInUp 0.8s ease 0.4s both; }

/* ========== Terminal ========== */
.hero-terminal {
    margin-top: 56px; background: #1e1e2e; border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg); overflow: hidden; max-width: 680px;
    animation: fadeInUp 0.8s ease 0.5s both; box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}
.terminal-header {
    display: flex; align-items: center; gap: 8px; padding: 12px 18px;
    background: rgba(255,255,255,0.03); border-bottom: 1px solid rgba(255,255,255,0.06);
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot:nth-child(1) { background: #ef4444; }
.terminal-dot:nth-child(2) { background: #f59e0b; }
.terminal-dot:nth-child(3) { background: #22c55e; }
.terminal-title { margin-left: 12px; font-size: 0.75rem; color: rgba(255,255,255,0.4); font-family: var(--font-mono); }
.terminal-body { padding: 20px; font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.8; min-height: 150px; color: rgba(255,255,255,0.7); }
.terminal-line { margin-bottom: 2px; }
.terminal-prompt { color: #22c55e; }
.terminal-output { color: rgba(255,255,255,0.6); }
.terminal-danger { color: #ef4444; }
.terminal-success { color: #22c55e; }
.cursor-blink { display: inline-block; width: 7px; height: 14px; background: #22c55e; vertical-align: middle; animation: blink 1s infinite; }

/* ========== Sections ========== */
section { position: relative; z-index: 1; padding: 100px 24px; }
.section-label {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 0.8rem; color: var(--accent); text-transform: uppercase;
    letter-spacing: 3px; font-weight: 600; margin-bottom: 16px;
    font-family: var(--font-mono);
}
.section-label::before { content: ''; width: 20px; height: 1px; background: var(--accent); }
.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 800;
    letter-spacing: -0.5px; margin-bottom: 16px; line-height: 1.15;
}
.section-desc { font-size: 1.05rem; color: var(--text-secondary); max-width: 640px; margin-bottom: 56px; line-height: 1.7; }
.section-header-center { text-align: center; }
.section-header-center .section-desc { margin-left: auto; margin-right: auto; }

/* Dark section variants */
.section-dark { background: var(--bg-dark); color: var(--text-dark-primary); }
.section-dark .section-label { color: var(--accent-lime); }
.section-dark .section-label::before { background: var(--accent-lime); }
.section-dark .section-desc { color: var(--text-dark-secondary); }

/* ========== Pain Points ========== */
/* ========== Pain Points ========== */
.pain-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.pain-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    padding: 36px 28px; position: relative; overflow: hidden; transition: var(--transition);
}
.pain-card:hover { border-color: rgba(22,93,255,0.2); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.pain-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--danger), transparent); }
.pain-icon { width: 48px; height: 48px; background: rgba(239,68,68,0.06); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.pain-icon svg { width: 24px; height: 24px; stroke: #ef4444; fill: none; }
.pain-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.pain-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }
.pain-stat { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 0.82rem; color: var(--text-muted); }
.pain-stat strong { color: var(--danger); font-size: 1rem; }

/* ========== Services ========== */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.service-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    padding: 36px 28px; position: relative; transition: var(--transition);
    display: flex; flex-direction: column;
}
.service-card:hover { border-color: rgba(22,93,255,0.2); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.service-card.featured { border-color: var(--accent); }
.service-card.featured::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--accent), #7c5bff); border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.service-name { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.service-desc { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 20px; line-height: 1.6; min-height: 3em; }
.service-price { font-size: 1.8rem; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.service-price span { font-size: 0.85rem; font-weight: 400; color: var(--text-muted); }
.service-period { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 24px; }
.service-features { list-style: none; margin-bottom: 28px; flex: 1; }
.service-features li { display: flex; align-items: flex-start; gap: 10px; padding: 8px 0; font-size: 0.88rem; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.service-features li:last-child { border-bottom: none; }
.service-features .check { color: var(--accent); font-weight: bold; flex-shrink: 0; margin-top: 2px; }
.service-card .btn-primary, .service-card .btn-secondary { margin-top: auto; }

/* ========== Vulnerability Cards ========== */
.vuln-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.vuln-card {
    display: flex; align-items: flex-start; gap: 16px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 24px; transition: var(--transition);
}
.vuln-card:hover { border-color: rgba(22,93,255,0.2); box-shadow: var(--shadow); }
.vuln-severity {
    font-size: 0.7rem; font-weight: 700; padding: 4px 10px; border-radius: 6px;
    text-transform: uppercase; letter-spacing: 0.5px; white-space: nowrap; flex-shrink: 0;
}
.severity-critical { background: rgba(239,68,68,0.1); color: #ef4444; }
.severity-high { background: rgba(245,158,11,0.1); color: #f59e0b; }
.severity-medium { background: rgba(22,93,255,0.1); color: var(--accent); }
.vuln-info h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.vuln-info p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }
.vuln-meta { margin-top: 10px; display: flex; gap: 16px; font-size: 0.78rem; color: var(--text-muted); }

/* ========== Stats ========== */
.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; margin-top: 48px;
}
.stat-card {
    text-align: center; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 36px 20px; transition: var(--transition);
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.stat-number { font-size: 2.4rem; font-weight: 800; color: var(--accent); margin-bottom: 8px; font-family: var(--font-mono); }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; }

/* ========== Comparison Table ========== */
.comparison-table-wrapper { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--border); }
.comparison-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.comparison-table thead { background: var(--bg-secondary); }
.comparison-table th { padding: 16px 20px; text-align: left; font-weight: 600; font-size: 0.85rem; color: var(--text-secondary); border-bottom: 1px solid var(--border); }
.comparison-table td { padding: 14px 20px; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table .highlight-col { color: var(--accent); font-weight: 600; }
.comparison-table .highlight-col-header { color: var(--accent); font-weight: 700; }

/* ========== Process Timeline ========== */
.process-timeline { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.process-step {
    text-align: center; padding: 32px 24px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
    transition: var(--transition);
}
.process-step:hover { border-color: rgba(22,93,255,0.2); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-number { font-size: 2rem; font-weight: 800; color: var(--accent); margin-bottom: 12px; font-family: var(--font-mono); }
.step-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 12px; }
.step-time { font-size: 0.78rem; color: var(--accent); font-weight: 600; font-family: var(--font-mono); }

/* ========== FAQ ========== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
    display: flex; align-items: center; justify-content: space-between; width: 100%;
    padding: 24px 0; font-size: 1rem; font-weight: 600;
    background: none; border: none; cursor: pointer; color: var(--text-primary);
    text-align: left; transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-arrow { width: 20px; height: 20px; color: var(--text-muted); transition: transform 0.3s ease; flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-answer-inner { padding: 0 0 24px; font-size: 0.92rem; color: var(--text-secondary); line-height: 1.8; }

/* ========== Contact Form ========== */
.contact-form { max-width: 700px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: 10px;
    font-size: 0.9rem; color: var(--text-primary); background: var(--bg-card);
    transition: var(--transition); font-family: var(--font-sans);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(22,93,255,0.08);
}
.form-group textarea { min-height: 100px; resize: vertical; }
.form-submit { margin-top: 8px; }

/* ========== Footer ========== */
.footer {
    background: var(--bg-dark); color: var(--text-dark-muted); padding: 48px 24px;
    position: relative; z-index: 1;
}
.footer-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}
.footer-brand { display: flex; align-items: center; gap: 8px; font-size: 1.1rem; font-weight: 700; color: var(--text-dark-primary); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-dark-muted); font-size: 0.85rem; transition: var(--transition); }
.footer-links a:hover { color: var(--text-dark-primary); }
.footer-copy { font-size: 0.8rem; }

/* ========== Scroll Reveal ========== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ========== Animations ========== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(1.5); } }
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .nav-links { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(255,255,255,0.98); flex-direction: column; justify-content: center; align-items: center; gap: 24px; z-index: 200; }
    .nav-links.active { display: flex; }
    .mobile-toggle { display: block; z-index: 300; }
    .hero-title { font-size: clamp(1.8rem, 6vw, 2.6rem); }
    .hero { padding: 100px 16px 60px; min-height: auto; }
    section { padding: 60px 16px; }
    .form-row { grid-template-columns: 1fr; }
    .services-grid, .pain-grid, .vuln-grid, .process-timeline { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { flex-direction: column; text-align: center; }
    .footer-links { flex-wrap: wrap; justify-content: center; }
}

/* ========== FAQ (GEO 优化模块) ========== */
.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    background: var(--bg-card);
    transition: var(--transition);
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.faq-item:hover { border-color: var(--accent); box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.faq-item[open] { border-color: var(--accent); box-shadow: 0 2px 12px rgba(22,93,255,0.1); }

.faq-q {
    padding: 22px 28px;
    font-size: 1.02rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    user-select: none;
}
/* 跨浏览器移除默认三角标记 */
.faq-q::-webkit-details-marker { display: none; }
.faq-q::marker { content: ""; display: none; }

.faq-q::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(22,93,255,0.08);
}
.faq-item[open] .faq-q::after {
    content: '−';
    background: rgba(22,93,255,0.15);
}

.faq-a {
    padding: 0 28px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}
.faq-a ul { margin: 12px 0 12px 20px; }
.faq-a li { margin-bottom: 6px; }
.faq-a strong { color: var(--text-primary); }