/* ============================================
   Detective Template — 侦探悬疑风格 (Noir Detective)
   Style: Dark Noir Mystery — 暗黑侦探悬疑
   Colors: Amber Gold #D4A24C + Charcoal #0B0B0D
   Font: Georgia/serif headings + system sans body
   CSS Prefix: sleuth
   ============================================ */

:root {
    --sl-gold: #D4A24C;
    --sl-gold-light: #E8C988;
    --sl-gold-dim: #B8862F;
    --sl-gold-glow: rgba(212, 162, 76, 0.18);
    --sl-red: #A52A2A;
    --sl-red-light: #C44545;
    --sl-bg: #0B0B0D;
    --sl-bg2: #131316;
    --sl-bg3: #18181C;
    --sl-card: rgba(212, 162, 76, 0.03);
    --sl-card-h: rgba(212, 162, 76, 0.07);
    --sl-text: #EDE8E0;
    --sl-text-sec: #A8A29A;
    --sl-text-muted: #6B665E;
    --sl-border: rgba(212, 162, 76, 0.12);
    --sl-border-h: rgba(212, 162, 76, 0.28);
    --sl-radius: 10px;
    --sl-radius-lg: 14px;
    --sl-font-heading: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
    --sl-font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --sl-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body {
    font-family: var(--sl-font-body);
    font-size: 16px; line-height: 1.7; color: var(--sl-text);
    background: var(--sl-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: var(--sl-transition); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
h1, h2, h3, h4 { font-family: var(--sl-font-heading); font-weight: 700; line-height: 1.25; color: var(--sl-text); letter-spacing: 0.5px; }

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

/* ===== Navbar ===== */
.sleuth-nav {
    position: fixed; top: 14px; left: 14px; right: 14px; z-index: 1000;
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 24px;
    background: rgba(11, 11, 13, 0.88); backdrop-filter: blur(16px);
    border: 1px solid var(--sl-border); border-radius: var(--sl-radius);
    transition: var(--sl-transition);
}
.sleuth-nav.scrolled { background: rgba(11, 11, 13, 0.97); box-shadow: 0 4px 24px rgba(0,0,0,0.4); }
.sleuth-logo { display: flex; align-items: center; gap: 10px; font-family: var(--sl-font-heading); font-weight: 700; font-size: 1.15rem; color: var(--sl-text); }
.sleuth-logo-icon { width: 36px; height: 36px; background: linear-gradient(135deg, var(--sl-gold), var(--sl-gold-dim)); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #0B0B0D; flex-shrink: 0; box-shadow: 0 0 12px var(--sl-gold-glow); }
.sleuth-logo-icon svg { width: 20px; height: 20px; }
.sleuth-nav-links { display: flex; gap: 28px; }
.sleuth-nav-links a { font-size: 0.88rem; font-weight: 500; color: var(--sl-text-sec); position: relative; }
.sleuth-nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1px; background: var(--sl-gold); transition: width 0.3s; }
.sleuth-nav-links a:hover { color: var(--sl-gold-light); }
.sleuth-nav-links a:hover::after { width: 100%; }
.sleuth-nav-cta { display: inline-flex; align-items: center; gap: 6px; padding: 9px 20px; background: var(--sl-gold); color: #0B0B0D; border-radius: 6px; font-size: 0.84rem; font-weight: 700; cursor: pointer; transition: var(--sl-transition); }
.sleuth-nav-cta:hover { background: var(--sl-gold-light); box-shadow: 0 4px 16px var(--sl-gold-glow); transform: translateY(-1px); }
.sleuth-mobile-btn { display: none; background: none; border: none; cursor: pointer; color: var(--sl-gold); padding: 4px; }

/* ===== Hero ===== */
.sleuth-hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding: 120px 0 80px; overflow: hidden; }
.sleuth-hero-bg-wrap { position: absolute; inset: 0; z-index: 0; }
.sleuth-hero-bg-img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(0.5) brightness(0.5); }
.sleuth-hero-overlay { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(11,11,13,0.92) 0%, rgba(11,11,13,0.82) 50%, rgba(11,11,13,0.97) 100%); }
/* film grain texture */
.sleuth-hero-overlay::after { content: ''; position: absolute; inset: 0; background: repeating-linear-gradient(0deg, rgba(255,255,255,0.015) 0px, rgba(255,255,255,0.015) 1px, transparent 1px, transparent 3px); pointer-events: none; }
.sleuth-hero-inner { position: relative; z-index: 1; max-width: 720px; }
.sleuth-hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px; background: rgba(212,162,76,0.08); border: 1px solid var(--sl-border-h); border-radius: 20px; font-size: 0.78rem; font-weight: 600; color: var(--sl-gold-light); margin-bottom: 22px; letter-spacing: 1px; }
.sleuth-hero-badge .sleuth-dot { width: 6px; height: 6px; background: var(--sl-gold); border-radius: 50%; animation: sl-pulse 2s infinite; box-shadow: 0 0 8px var(--sl-gold); }
@keyframes sl-pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }
.sleuth-hero h1 { font-size: 3rem; font-weight: 700; margin-bottom: 20px; color: var(--sl-text); }
.sleuth-hero h1 .sleuth-accent { color: var(--sl-gold); font-style: italic; }
.sleuth-hero-desc { font-size: 1.02rem; color: var(--sl-text-sec); margin-bottom: 32px; max-width: 540px; line-height: 1.85; }
.sleuth-hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }
.sleuth-btn-cta { display: inline-flex; align-items: center; gap: 8px; padding: 15px 34px; background: var(--sl-gold); color: #0B0B0D; border-radius: 8px; font-weight: 700; font-size: 0.95rem; cursor: pointer; border: none; transition: var(--sl-transition); box-shadow: 0 4px 20px var(--sl-gold-glow); }
.sleuth-btn-cta:hover { background: var(--sl-gold-light); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(212,162,76,0.35); }
.sleuth-btn-ghost { display: inline-flex; align-items: center; gap: 8px; padding: 15px 30px; background: transparent; color: var(--sl-text-sec); border: 1px solid var(--sl-border-h); border-radius: 8px; font-weight: 500; font-size: 0.95rem; cursor: pointer; }
.sleuth-btn-ghost:hover { border-color: var(--sl-gold); color: var(--sl-gold-light); background: var(--sl-card); }
.sleuth-hero-nums { display: flex; align-items: center; gap: 32px; }
.sleuth-hn { }
.sleuth-hn-v { display: block; font-size: 1.7rem; font-weight: 700; color: var(--sl-gold-light); font-family: var(--sl-font-heading); }
.sleuth-hn-l { font-size: 0.76rem; color: var(--sl-text-muted); letter-spacing: 0.5px; }
.sleuth-hn-sep { width: 1px; height: 36px; background: var(--sl-border); }

/* ===== Trust Bar ===== */
.sleuth-trust { padding: 22px 0; background: var(--sl-bg2); border-bottom: 1px solid var(--sl-border); border-top: 1px solid var(--sl-border); }
.sleuth-trust-inner { display: flex; justify-content: center; gap: 38px; flex-wrap: wrap; }
.sleuth-trust-item { display: flex; align-items: center; gap: 8px; font-size: 0.83rem; font-weight: 500; color: var(--sl-text-sec); }
.sleuth-trust-item svg { color: var(--sl-gold); flex-shrink: 0; }

/* ===== Section Common ===== */
.sleuth-section { padding: 90px 0; }
.sleuth-section-alt { background: var(--sl-bg2); }
.sleuth-sec-header { text-align: center; margin-bottom: 54px; }
.sleuth-sec-tag { display: inline-block; padding: 5px 16px; background: rgba(212,162,76,0.08); color: var(--sl-gold-light); border: 1px solid var(--sl-border); border-radius: 20px; font-size: 0.75rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 14px; }
.sleuth-sec-header h2 { font-size: 2.1rem; margin-bottom: 12px; color: var(--sl-text); }
.sleuth-sec-header h2 .sleuth-h-accent { color: var(--sl-gold); }
.sleuth-sec-header p { font-size: 0.92rem; color: var(--sl-text-sec); max-width: 560px; margin: 0 auto; }

/* ===== Features ===== */
.sleuth-feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.sleuth-feat-card { padding: 30px 26px; background: var(--sl-bg2); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); transition: var(--sl-transition); cursor: pointer; position: relative; overflow: hidden; }
.sleuth-feat-card::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--sl-gold); transition: width 0.3s; }
.sleuth-feat-card:hover { border-color: var(--sl-border-h); transform: translateY(-4px); background: var(--sl-bg3); }
.sleuth-feat-card:hover::after { width: 100%; }
.sleuth-feat-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: rgba(212,162,76,0.08); border: 1px solid var(--sl-border); border-radius: 10px; margin-bottom: 18px; }
.sleuth-feat-icon svg { width: 24px; height: 24px; stroke: var(--sl-gold-light); }
.sleuth-feat-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.sleuth-feat-card p { font-size: 0.85rem; color: var(--sl-text-sec); line-height: 1.75; }

/* ===== Services Showcase ===== */
.sleuth-svc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.sleuth-svc-card { display: flex; flex-direction: column; background: var(--sl-bg2); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); overflow: hidden; transition: var(--sl-transition); cursor: pointer; }
.sleuth-svc-card:hover { border-color: var(--sl-border-h); transform: translateY(-3px); box-shadow: 0 12px 36px rgba(0,0,0,0.3); }
.sleuth-svc-img { height: 190px; overflow: hidden; position: relative; }
.sleuth-svc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; filter: grayscale(0.3) brightness(0.85); }
.sleuth-svc-img::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 50%, rgba(11,11,13,0.6) 100%); pointer-events: none; }
.sleuth-svc-card:hover .sleuth-svc-img img { transform: scale(1.05); filter: grayscale(0) brightness(1); }
.sleuth-svc-body { padding: 24px 26px; }
.sleuth-svc-body h3 { font-size: 1.05rem; margin-bottom: 10px; }
.sleuth-svc-body p { font-size: 0.85rem; color: var(--sl-text-sec); line-height: 1.75; margin-bottom: 14px; }
.sleuth-svc-link { color: var(--sl-gold-light); font-size: 0.84rem; font-weight: 600; display: inline-flex; align-items: center; gap: 4px; transition: var(--sl-transition); }
.sleuth-svc-link:hover { gap: 8px; color: var(--sl-gold); }

/* ===== About ===== */
.sleuth-about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.sleuth-about-img { position: relative; border-radius: var(--sl-radius); overflow: hidden; border: 1px solid var(--sl-border); }
.sleuth-about-img img { width: 100%; height: 400px; object-fit: cover; filter: grayscale(0.4) brightness(0.8); transition: filter 0.4s; }
.sleuth-about-img:hover img { filter: grayscale(0) brightness(0.95); }
.sleuth-about-img::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(212,162,76,0.08), transparent 60%); z-index: 1; pointer-events: none; }
.sleuth-about-float { position: absolute; bottom: -16px; right: -16px; background: var(--sl-gold); color: #0B0B0D; border-radius: var(--sl-radius); padding: 16px 22px; text-align: center; z-index: 2; box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.sleuth-about-float .sleuth-af-num { font-size: 1.5rem; font-weight: 800; display: block; font-family: var(--sl-font-heading); }
.sleuth-about-float .sleuth-af-label { font-size: 0.72rem; opacity: 0.85; }
.sleuth-about-text .sleuth-sec-tag { margin-bottom: 12px; }
.sleuth-about-text h2 { font-size: 1.85rem; margin-bottom: 16px; }
.sleuth-about-text p { color: var(--sl-text-sec); margin-bottom: 14px; font-size: 0.9rem; line-height: 1.85; }
.sleuth-link { display: inline-flex; align-items: center; gap: 6px; color: var(--sl-gold-light); font-weight: 600; font-size: 0.9rem; }
.sleuth-link:hover { gap: 10px; color: var(--sl-gold); }

/* ===== Steps / Process ===== */
.sleuth-steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.sleuth-step-card { text-align: center; padding: 32px 18px; background: var(--sl-bg2); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); transition: var(--sl-transition); position: relative; }
.sleuth-step-card:hover { border-color: var(--sl-border-h); transform: translateY(-4px); }
.sleuth-step-num { font-size: 2.4rem; font-weight: 700; color: rgba(212,162,76,0.2); margin-bottom: 10px; font-family: var(--sl-font-heading); }
.sleuth-step-card h3 { font-size: 0.98rem; margin-bottom: 8px; }
.sleuth-step-card p { font-size: 0.82rem; color: var(--sl-text-muted); }

/* ===== Testimonials ===== */
.sleuth-testi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.sleuth-testi-card { padding: 28px 24px; background: var(--sl-bg2); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); transition: var(--sl-transition); }
.sleuth-testi-card:hover { transform: translateY(-3px); border-color: var(--sl-border-h); }
.sleuth-testi-stars { color: var(--sl-gold); font-size: 0.85rem; margin-bottom: 14px; letter-spacing: 2px; }
.sleuth-testi-card > p { font-size: 0.86rem; color: var(--sl-text-sec); line-height: 1.8; margin-bottom: 18px; font-style: italic; }
.sleuth-testi-author { display: flex; align-items: center; gap: 10px; }
.sleuth-ta-avatar { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, var(--sl-gold), var(--sl-gold-dim)); color: #0B0B0D; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.82rem; font-family: var(--sl-font-heading); }
.sleuth-testi-author strong { font-size: 0.84rem; display: block; color: var(--sl-text); }
.sleuth-testi-author span { font-size: 0.74rem; color: var(--sl-text-muted); }

/* ===== FAQ ===== */
.sleuth-faq-layout { display: grid; grid-template-columns: 1fr 2fr; gap: 60px; }
.sleuth-faq-side { position: sticky; top: 100px; align-self: start; }
.sleuth-faq-side .sleuth-sec-tag { margin-bottom: 12px; }
.sleuth-faq-side h2 { font-size: 1.7rem; margin-bottom: 14px; }
.sleuth-faq-side p { font-size: 0.86rem; color: var(--sl-text-sec); line-height: 1.8; }
.sleuth-faq-main { display: flex; flex-direction: column; gap: 10px; }
.sleuth-faq-item { background: var(--sl-bg2); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); overflow: hidden; transition: border-color 0.2s; }
.sleuth-faq-item:hover { border-color: var(--sl-border-h); }
.sleuth-faq-q { display: flex; align-items: center; justify-content: space-between; padding: 16px 22px; cursor: pointer; font-weight: 500; font-size: 0.9rem; color: var(--sl-text); }
.sleuth-faq-q svg { flex-shrink: 0; stroke: var(--sl-gold); transition: transform 0.3s; }
.sleuth-faq-item.active .sleuth-faq-q svg { transform: rotate(180deg); }
.sleuth-faq-a { padding: 0 22px; max-height: 0; overflow: hidden; transition: max-height 0.3s, padding 0.3s; font-size: 0.85rem; color: var(--sl-text-sec); line-height: 1.8; }
.sleuth-faq-item.active .sleuth-faq-a { padding: 0 22px 16px; max-height: 240px; }

/* ===== Recommend ===== */
.sleuth-recommend { padding: 70px 0; }
.sleuth-recommend-grid { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.sleuth-recommend-grid a { display: inline-block; padding: 9px 18px; background: var(--sl-bg2); border: 1px solid var(--sl-border); border-radius: 8px; font-size: 0.83rem; color: var(--sl-text-sec); transition: var(--sl-transition); cursor: pointer; }
.sleuth-recommend-grid a:hover { color: var(--sl-gold-light); border-color: var(--sl-gold); transform: translateY(-2px); background: var(--sl-card-h); }

/* ===== CTA ===== */
.sleuth-cta-sec { padding: 80px 0; background: var(--sl-bg2); }
.sleuth-cta-box { text-align: center; max-width: 620px; margin: 0 auto; padding: 64px 40px; border: 1px solid var(--sl-border); border-radius: var(--sl-radius-lg); position: relative; overflow: hidden; background: linear-gradient(135deg, rgba(212,162,76,0.06), rgba(212,162,76,0.02)); }
.sleuth-cta-box::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--sl-gold), transparent); }
.sleuth-cta-box h2 { font-size: 1.9rem; margin-bottom: 12px; }
.sleuth-cta-box p { font-size: 0.92rem; color: var(--sl-text-sec); margin-bottom: 30px; }

/* ===== Footer ===== */
.sleuth-footer { padding: 52px 0 0; border-top: 1px solid var(--sl-border); background: var(--sl-bg); }
.sleuth-footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid var(--sl-border); }
.sleuth-footer-desc { font-size: 0.82rem; color: var(--sl-text-muted); margin-top: 14px; line-height: 1.8; max-width: 400px; }
.sleuth-footer-nav h4 { color: var(--sl-gold-light); font-size: 0.88rem; margin-bottom: 16px; font-family: var(--sl-font-heading); }
.sleuth-footer-nav li { margin-bottom: 9px; }
.sleuth-footer-nav a { font-size: 0.82rem; color: var(--sl-text-muted); }
.sleuth-footer-nav a:hover { color: var(--sl-gold-light); }
.sleuth-footer-bottom { padding: 22px 0; text-align: center; font-size: 0.76rem; color: var(--sl-text-muted); }

/* ===== Page Header (sub pages) ===== */
.sleuth-page-hero { padding: 150px 0 60px; text-align: center; position: relative; }
.sleuth-page-hero h1 { font-size: 2.6rem; margin-bottom: 12px; }
.sleuth-page-hero p { font-size: 0.95rem; color: var(--sl-text-sec); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .sleuth-hero h1 { font-size: 2.4rem; }
    .sleuth-feat-grid { grid-template-columns: repeat(2, 1fr); }
    .sleuth-svc-grid { grid-template-columns: 1fr; }
    .sleuth-about-grid { grid-template-columns: 1fr; }
    .sleuth-about-float { bottom: -12px; right: -12px; }
    .sleuth-faq-layout { grid-template-columns: 1fr; }
    .sleuth-faq-side { position: static; text-align: center; }
    .sleuth-footer-top { grid-template-columns: 1fr 1fr; }
    .sleuth-steps-grid { grid-template-columns: repeat(2, 1fr); }
    .sleuth-testi-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .sleuth-nav { top: 8px; left: 8px; right: 8px; padding: 10px 16px; flex-wrap: wrap; }
    .sleuth-nav-links { display: none; position: absolute; top: calc(100% + 8px); left: 0; right: 0; flex-direction: column; background: rgba(11,11,13,0.98); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); padding: 12px 16px; gap: 0; backdrop-filter: blur(16px); }
    .sleuth-nav-links.active { display: flex; }
    .sleuth-nav-links li { border-bottom: 1px solid var(--sl-border); }
    .sleuth-nav-links li:last-child { border-bottom: none; }
    .sleuth-nav-links a { display: block; padding: 12px 0; }
    .sleuth-nav-links a::after { display: none; }
    .sleuth-nav-cta { display: none; }
    .sleuth-mobile-btn { display: block; }
    .sleuth-hero { padding: 110px 0 60px; min-height: auto; }
    .sleuth-hero h1 { font-size: 1.9rem; }
    .sleuth-hero-actions { flex-direction: column; }
    .sleuth-btn-cta, .sleuth-btn-ghost { width: 100%; justify-content: center; }
    .sleuth-hero-nums { flex-wrap: wrap; gap: 18px; }
    .sleuth-hn-sep { display: none; }
    .sleuth-feat-grid { grid-template-columns: 1fr; }
    .sleuth-sec-header h2 { font-size: 1.6rem; }
    .sleuth-section { padding: 60px 0; }
    .sleuth-cta-box { padding: 40px 20px; }
    .sleuth-cta-box h2 { font-size: 1.4rem; }
    .sleuth-footer-top { grid-template-columns: 1fr; gap: 28px; }
    .sleuth-page-hero h1 { font-size: 2rem; }
}
@media (max-width: 480px) {
    .sleuth-steps-grid { grid-template-columns: 1fr; }
    .sleuth-trust-inner { gap: 16px; }
}