@font-face{font-family:'Portal Noto Sans SC';src:url('/static/portal/noto-sans-sc-portal.woff2') format('woff2');font-weight:100 900;font-style:normal;font-display:swap}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

/* a11y: 视觉隐藏但屏幕阅读器/搜索引擎可读 */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* a11y: 键盘焦点指示 */
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:6px}

:root[data-theme="dark"] {
  --body-bg: radial-gradient(ellipse at top, #1a0f2e 0%, #0f0f1a 50%, #0a0a12 100%);
  --grad: linear-gradient(135deg, #a855f7, #ec4899);
  --grad-text: linear-gradient(135deg, #c084fc, #f472b6);
  --card-bg-grad: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.02) 100%);
  --card-border: rgba(255,255,255,0.14);
  --card-border-strong: rgba(255,255,255,0.18);
  --card-shadow: 0 20px 60px rgba(168,85,247,0.15);
  --card-hover-translate: -6px;
  --preview-dot-idle: rgba(255,255,255,0.15);
  --text: #ffffff;
  --text-strong: #ffffff;
  --text-muted: rgba(255,255,255,0.6);
  --purple: #a855f7;
  --pink: #ec4899;
  --focus: #c084fc;
  --nav-bg: rgba(10,10,18,0.75);
  --nav-border: rgba(192,132,252,0.18);
  --nav-link: rgba(255,255,255,0.7);
  --nav-link-hover: #fff;
  --section-dark-bg: rgba(255,255,255,0.015);
  --hero-grid-line: rgba(168,85,247,0.06);
  --hero-title-shadow: 0 0 80px rgba(168,85,247,0.3);
  --hero-sub-color: rgba(255,255,255,0.55);
  --badge-bg: rgba(168,85,247,0.1);
  --badge-border: rgba(168,85,247,0.25);
  --badge-text: rgba(200,150,255,0.9);
  --btn-primary-shadow: 0 4px 24px rgba(168,85,247,0.4), inset 0 1px 0 rgba(255,255,255,0.15);
  --btn-primary-shadow-hover: 0 12px 40px rgba(168,85,247,0.5), inset 0 1px 0 rgba(255,255,255,0.15);
  --feature-icon-bg: linear-gradient(135deg,rgba(168,85,247,0.2),rgba(236,72,153,0.1));
  --feature-icon-border: rgba(168,85,247,0.2);
  --feature-card-glow: linear-gradient(135deg,rgba(168,85,247,0.15),transparent 60%);
  --feature-card-hover-border: rgba(168,85,247,0.4);
  --testimonial-quote-opacity: 0.15;
  --proof-bg: rgba(255,255,255,0.04);
  --proof-border: rgba(255,255,255,0.12);
  --proof-strong: #fff;
  --proof-text: rgba(255,255,255,0.65);
  --hero-panel-bg: rgba(10,10,20,0.8);
  --hero-panel-border: rgba(168,85,247,0.2);
  --hero-panel-shadow: 0 40px 80px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.05);
  --preview-bar-bg: rgba(255,255,255,0.04);
  --preview-bar-border: rgba(255,255,255,0.1);
  --preview-title: rgba(255,255,255,0.35);
  --preview-msg-user-bg: rgba(168,85,247,0.15);
  --preview-msg-user-border: rgba(168,85,247,0.2);
  --preview-msg-user-text: rgba(255,255,255,0.8);
  --signal-bg: rgba(168,85,247,0.08);
  --signal-border: rgba(168,85,247,0.25);
  --signal-text: rgba(200,150,255,0.8);
  --privacy-bg: rgba(168,85,247,0.04);
  --privacy-border: rgba(168,85,247,0.2);
  --privacy-text: rgba(255,255,255,0.5);
  --contrast-bad-bg: rgba(255,255,255,0.03);
  --contrast-good-bg: linear-gradient(135deg,rgba(168,85,247,0.12),rgba(236,72,153,0.06));
  --contrast-good-border: rgba(168,85,247,0.3);
  --contrast-label: rgba(255,255,255,0.5);
  --contrast-text: rgba(255,255,255,0.6);
  --cta-banner-bg: linear-gradient(135deg,rgba(168,85,247,0.08),rgba(236,72,153,0.08));
  --cta-banner-border-top: rgba(168,85,247,0.2);
  --cta-banner-border-bottom: rgba(236,72,153,0.2);
  --footer-border: rgba(255,255,255,0.1);
  --footer-copy: rgba(255,255,255,0.55);
  --footer-disclaimer: rgba(255,255,255,0.4);
  --glow-1: rgba(168,85,247,0.2);
  --glow-2: rgba(236,72,153,0.15);
  --glow-3: rgba(168,85,247,0.2);
  --nav-mobile-menu-bg: rgba(10,10,18,0.96);
  --nav-mobile-menu-border: rgba(168,85,247,0.18);
  --nav-mobile-link-border: rgba(255,255,255,0.08);
}

:root:not([data-theme]), :root[data-theme="light"] {
  --body-bg: radial-gradient(ellipse at top, #faf7ff 0%, #fef5fa 40%, #ffffff 100%);
  --grad: linear-gradient(135deg, #a855f7, #ec4899);
  --grad-text: linear-gradient(135deg, #7c3aed, #db2777);
  --card-bg-grad: linear-gradient(135deg, #ffffff 0%, #fdfbff 100%);
  --card-border: #e8e8f2;
  --card-border-strong: #dcdce8;
  --card-shadow: 0 16px 40px rgba(168,85,247,0.16), 0 2px 8px rgba(168,85,247,0.05);
  --card-hover-translate: -4px;
  --preview-dot-idle: rgba(150,150,170,0.3);
  --text: #1a1a2e;
  --text-strong: #0f0f1a;
  --text-muted: #475569;
  --purple: #7c3aed;
  --pink: #db2777;
  --focus: #7c3aed;
  --nav-bg: rgba(255,255,255,0.85);
  --nav-border: rgba(168,85,247,0.12);
  --nav-link: #475569;
  --nav-link-hover: #1a1a2e;
  --section-dark-bg: #faf7ff;
  --hero-grid-line: rgba(168,85,247,0.05);
  --hero-title-shadow: 0 2px 16px rgba(168,85,247,0.08);
  --hero-sub-color: #475569;
  --badge-bg: rgba(168,85,247,0.08);
  --badge-border: rgba(168,85,247,0.2);
  --badge-text: #7c3aed;
  --btn-primary-shadow: 0 4px 16px rgba(168,85,247,0.28), inset 0 1px 0 rgba(255,255,255,0.25);
  --btn-primary-shadow-hover: 0 12px 32px rgba(168,85,247,0.38), inset 0 1px 0 rgba(255,255,255,0.25);
  --feature-icon-bg: linear-gradient(135deg,rgba(168,85,247,0.12),rgba(236,72,153,0.06));
  --feature-icon-border: rgba(168,85,247,0.18);
  --feature-card-glow: linear-gradient(135deg,rgba(168,85,247,0.06),transparent 60%);
  --feature-card-hover-border: rgba(168,85,247,0.4);
  --testimonial-quote-opacity: 0.12;
  --proof-bg: #ffffff;
  --proof-border: #e8e8f2;
  --proof-strong: #1a1a2e;
  --proof-text: #64748b;
  --hero-panel-bg: #ffffff;
  --hero-panel-border: rgba(168,85,247,0.18);
  --hero-panel-shadow: 0 24px 48px rgba(168,85,247,0.18), 0 4px 12px rgba(15,15,26,0.06);
  --preview-bar-bg: #faf7ff;
  --preview-bar-border: #e8e8f2;
  --preview-title: #94a3b8;
  --preview-msg-user-bg: rgba(168,85,247,0.07);
  --preview-msg-user-border: rgba(168,85,247,0.16);
  --preview-msg-user-text: #1a1a2e;
  --signal-bg: rgba(168,85,247,0.08);
  --signal-border: rgba(168,85,247,0.2);
  --signal-text: #7c3aed;
  --privacy-bg: rgba(168,85,247,0.04);
  --privacy-border: rgba(168,85,247,0.18);
  --privacy-text: #64748b;
  --contrast-bad-bg: #f8fafc;
  --contrast-good-bg: linear-gradient(135deg,rgba(168,85,247,0.08),rgba(236,72,153,0.04));
  --contrast-good-border: rgba(168,85,247,0.25);
  --contrast-label: #64748b;
  --contrast-text: #475569;
  --cta-banner-bg: linear-gradient(135deg,rgba(168,85,247,0.12),rgba(236,72,153,0.10));
  --cta-banner-border-top: rgba(168,85,247,0.28);
  --cta-banner-border-bottom: rgba(236,72,153,0.28);
  --footer-border: #e8e8f2;
  --footer-copy: #64748b;
  --footer-disclaimer: #64748b;
  --glow-1: rgba(168,85,247,0.08);
  --glow-2: rgba(236,72,153,0.06);
  --glow-3: rgba(168,85,247,0.08);
  --nav-mobile-menu-bg: rgba(255,255,255,0.98);
  --nav-mobile-menu-border: rgba(168,85,247,0.15);
  --nav-mobile-link-border: #f1f1f8;
}

html {scroll-behavior:smooth}

body {
  font-family: 'Portal Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--body-bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background-color .25s ease, color .25s ease;
}

.container {max-width:1100px;margin:0 auto;padding:0 24px}

/* NAV */
.nav {
  position: fixed;top:0;left:0;right:0;z-index:100;
  padding: 18px 0;
  background: var(--nav-bg);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--nav-border);
  transition: background-color .25s ease, border-color .25s ease;
}
.nav-inner {
  max-width:1100px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.nav-brand {
  display:flex;align-items:center;gap:10px;
  text-decoration:none;color:var(--text);
  font-weight:700;font-size:18px;
}
.nav-links {display:flex;gap:20px}
.nav-links a {color:var(--nav-link);font-size:14px;text-decoration:none;transition:color .2s}
.nav-links a:hover {color:var(--nav-link-hover)}
.nav-logo {width:28px;height:28px;border-radius:6px;object-fit:cover}
.nav-actions {display:flex;align-items:center;gap:10px;margin-left:auto}
.nav-cta-compact {display:none}
.btn.nav-cta-desktop {
  min-height:40px;
  padding:9px 14px;
  border-radius:10px;
  font-size:14px;
  font-weight:600;
  line-height:1;
  letter-spacing:0;
}

/* THEME TOGGLE */
.theme-toggle{
  width:40px;height:40px;border-radius:10px;
  background:transparent;border:1px solid var(--card-border);
  color:var(--text);cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;
  padding:0;flex-shrink:0;transition:border-color .2s,color .2s,background-color .2s;
}
.theme-toggle:hover{border-color:var(--purple);color:var(--purple)}
.theme-toggle svg{width:18px;height:18px}
.theme-toggle .icon-sun{display:none}
.theme-toggle .icon-moon{display:block}
:root:not([data-theme]) .theme-toggle .icon-sun,:root[data-theme="light"] .theme-toggle .icon-sun{display:block}
:root:not([data-theme]) .theme-toggle .icon-moon,:root[data-theme="light"] .theme-toggle .icon-moon{display:none}

/* BUTTONS */
.btn {
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 28px;border-radius:50px;font-size:15px;font-weight:500;
  text-decoration:none;cursor:pointer;border:none;transition:all .2s;
  white-space:nowrap;
}
.btn-primary {
  background: var(--grad);color:#fff;
  box-shadow: var(--btn-primary-shadow);
  font-weight:600;letter-spacing:0.3px;
}
.btn-primary:hover {transform:translateY(-2px);box-shadow: var(--btn-primary-shadow-hover)}
.btn-outline {
  background:transparent;color:var(--text);
  border:1px solid var(--card-border);
}
.btn-outline:hover {border-color:var(--purple);color:var(--purple)}
.btn-lg {padding:16px 40px;font-size:17px}

/* GLOW */
.glow {
  position:absolute;border-radius:50%;
  filter:blur(80px);pointer-events:none;
}
.glow-1 {
  width:900px;height:900px;
  background:radial-gradient(circle, var(--glow-1) 0%, transparent 70%);
  top:-300px;left:-200px;
}
.glow-2 {
  width:700px;height:700px;
  background:radial-gradient(circle, var(--glow-2) 0%, transparent 70%);
  top:0;right:-200px;
}
.glow-3 {
  width:800px;height:400px;
  background:var(--glow-3);
  top:50%;left:50%;transform:translate(-50%,-50%);
}

/* BADGE */
.badge {
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 20px;border-radius:50px;
  background:var(--badge-bg);
  border:1px solid var(--badge-border);
  color:var(--badge-text);font-size:13px;font-weight:500;
  margin-bottom:24px;letter-spacing:0.5px;
}

/* HERO */
.hero {
  position:relative;overflow:hidden;
  padding:140px 0 100px;
}
.hero::before {
  content:'';position:absolute;inset:0;
  background-image:
    linear-gradient(var(--hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid-line) 1px, transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 100%);
}
.hero-inner {
  display:grid;
  grid-template-columns:1.15fr 1fr;
  gap:56px;
  align-items:center;
}
.hero-copy {
  display:flex;flex-direction:column;align-items:flex-start;
  position:relative;z-index:1;max-width:560px;
}
.grad {
  background: var(--grad-text);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-title {
  position:relative;
  font-size:72px;
  font-weight:700;line-height:1.05;
  margin-bottom:22px;letter-spacing:0;
  text-shadow: var(--hero-title-shadow);
}
.hero-title-line {
  display:block;
}
.hero-title-line:nth-child(2) {
  margin-left:0.72em;
  margin-top:0.04em;
}
.hero-title::after {
  content:'';position:absolute;left:0.72em;bottom:-10px;
  width:min(240px,52%);height:3px;border-radius:999px;
  background:linear-gradient(90deg,#22d3ee,var(--purple),var(--pink),transparent);
  box-shadow:0 0 24px rgba(168,85,247,0.45);
}
.hero-title-line .grad {position:relative}
.hero-title-line .grad::before {
  content:'';position:absolute;left:-0.08em;right:-0.08em;bottom:0.08em;
  height:0.3em;border-radius:999px;
  background:linear-gradient(90deg,rgba(34,211,238,0.14),rgba(236,72,153,0.18));
  z-index:-1;
}
.hero-sub {
  font-size:18px;
  color:var(--hero-sub-color);max-width:520px;
  margin:0 0 26px;line-height:1.9;
  font-weight:400;letter-spacing:0;
}
.hero-signal-card {
  width:100%;max-width:540px;margin:0 0 28px;padding:16px;
  border-radius:22px;
  background:
    radial-gradient(circle at 12% 10%,rgba(34,211,238,0.12),transparent 34%),
    linear-gradient(135deg,rgba(255,255,255,0.07),rgba(255,255,255,0.025));
  border:1px solid var(--card-border-strong);
  box-shadow:0 18px 50px rgba(0,0,0,0.18), inset 0 1px 0 rgba(255,255,255,0.06);
  overflow:hidden;position:relative;
}
.hero-signal-card::before {
  content:'';position:absolute;inset:0;
  background:linear-gradient(120deg,transparent 0%,rgba(255,255,255,0.055) 42%,transparent 64%);
  opacity:.55;
  pointer-events:none;
}
.hero-signal-top {
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:12px;margin-bottom:12px;border-bottom:1px solid var(--card-border);
  position:relative;z-index:1;
}
.hero-signal-label {
  display:inline-flex;align-items:center;gap:8px;
  color:var(--text);font-size:13px;font-weight:700;
}
.hero-signal-label::before {
  content:'';width:9px;height:9px;border-radius:50%;
  background:#22d3ee;box-shadow:0 0 16px rgba(34,211,238,0.75);
}
.hero-signal-grid {
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;
  position:relative;z-index:1;
}
.hero-signal-item {
  min-height:86px;padding:12px;border-radius:16px;
  background:rgba(255,255,255,0.04);
  border:1px solid var(--card-border);
}
.hero-signal-item strong {
  display:block;margin-bottom:8px;color:var(--text-strong);
  font-size:13px;font-weight:700;
}
.hero-signal-item span {
  display:block;color:var(--text-muted);font-size:12px;line-height:1.55;
}
.hero-signal-meter {
  height:5px;margin-top:10px;border-radius:999px;
  background:rgba(255,255,255,0.08);overflow:hidden;
}
.hero-signal-meter i {
  display:block;height:100%;border-radius:inherit;
  background:linear-gradient(90deg,#22d3ee,var(--purple),var(--pink));
}
.hero-cta {display:flex;gap:16px;flex-wrap:wrap;margin-bottom:28px}
:root:not([data-theme]) .hero-signal-card,:root[data-theme="light"] .hero-signal-card {
  background:
    radial-gradient(circle at 12% 10%,rgba(34,211,238,0.14),transparent 34%),
    linear-gradient(135deg,#ffffff 0%,#fdfbff 100%);
  box-shadow:0 18px 42px rgba(168,85,247,0.14), 0 4px 12px rgba(15,15,26,0.05);
}
:root:not([data-theme]) .hero-signal-item,:root[data-theme="light"] .hero-signal-item {background:#ffffff}
.preview-diagnosis {
  max-width:none;margin:0;padding:14px;
  border-radius:18px;box-shadow:none;
}
.preview-diagnosis .hero-signal-grid {
  grid-template-columns:1fr;gap:8px;
}
.preview-diagnosis .hero-signal-top {
  display:block;padding-bottom:10px;margin-bottom:10px;
}
.preview-diagnosis .hero-signal-item {
  min-height:0;
  display:grid;grid-template-columns:76px 1fr;gap:8px 10px;align-items:center;
  padding:11px 12px;border-radius:14px;
}
.preview-diagnosis .hero-signal-item strong {margin:0;font-size:12.5px}
.preview-diagnosis .hero-signal-item span {font-size:12.5px;line-height:1.5}
.preview-diagnosis .hero-signal-meter {grid-column:1 / -1;margin-top:2px}
/* SECTIONS */
.section {padding:100px 0}
.section-dark {background:var(--section-dark-bg);border-top:1px solid var(--card-border);border-bottom:1px solid var(--card-border)}
.section-header {text-align:center;margin-bottom:60px}
.section-title {font-size:42px;font-weight:700;margin-bottom:16px;letter-spacing:0}
.section-sub {color:var(--text-muted);font-size:17px;max-width:520px;margin:0 auto;line-height:1.8}

/* FEATURES */
.features-grid {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
}
.feature-card {
  padding:28px 24px;border-radius:20px;
  background: var(--card-bg-grad);
  border:1px solid var(--card-border-strong);
  transition:all .3s;
  position:relative;overflow:hidden;
}
.feature-card::before {
  content:'';position:absolute;inset:0;border-radius:20px;
  background:var(--feature-card-glow);
  opacity:0;transition:opacity .3s;
}
.feature-card:hover::before {opacity:1}
.feature-card:hover {
  border-color:var(--feature-card-hover-border);
  transform:translateY(var(--card-hover-translate, -6px));
  box-shadow:var(--card-shadow);
}
.feature-head {
  display:flex;align-items:center;gap:12px;
  margin-bottom:12px;position:relative;z-index:1;
}
.feature-icon {
  font-size:22px;
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:42px;border-radius:12px;
  background:var(--feature-icon-bg);
  border:1px solid var(--feature-icon-border);
  flex-shrink:0;
}
.feature-card h3 {font-size:17px;font-weight:600;margin:0}
.feature-card p {color:var(--text-muted);font-size:14px;line-height:1.7;position:relative;z-index:1}

/* STEPS */
.steps {
  display:flex;align-items:center;justify-content:center;
  gap:24px;flex-wrap:wrap;
}
.step {
  flex:1;min-width:220px;max-width:280px;
  padding:40px 32px;border-radius:24px;
  background: var(--card-bg-grad);
  border:1px solid var(--card-border-strong);
  text-align:center;position:relative;overflow:hidden;
}
.step::before {
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--grad);
}
.step-num {
  font-size:48px;font-weight:800;
  background:var(--grad-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  margin-bottom:16px;
}
.step h3 {font-size:17px;font-weight:600;margin-bottom:10px}
.step p {color:var(--text-muted);font-size:14px;line-height:1.7}
.step-arrow {font-size:28px;color:var(--purple);flex-shrink:0}

/* TESTIMONIALS */
.testimonials-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:24px;
}
.testimonial-card {
  padding:36px;border-radius:24px;
  background: var(--card-bg-grad);
  border:1px solid var(--card-border-strong);
  position:relative;overflow:hidden;
}
.testimonial-card::after {
  content:'\201C';position:absolute;top:-10px;right:24px;
  font-size:120px;line-height:1;
  background:var(--grad-text);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  opacity:var(--testimonial-quote-opacity);font-family:Georgia,serif;
}
.stars {color:#f59e0b;font-size:18px;margin-bottom:16px;letter-spacing:2px}
.testimonial-card p {
  color:var(--text-muted);font-size:15px;line-height:1.8;
  margin-bottom:24px;font-style:italic;
}
.testimonial-author {display:flex;align-items:center;gap:12px}
.avatar {
  width:40px;height:40px;border-radius:50%;
  background:var(--grad);
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:16px;flex-shrink:0;
}
.testimonial-author strong {display:block;font-size:15px}
.testimonial-author span {color:var(--text-muted);font-size:13px}

/* FAQ */
.faq-list {max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item {
  border-radius:16px;
  background: var(--card-bg-grad);
  border:1px solid var(--card-border);
  overflow:hidden;transition:border-color .2s;
}
.faq-item:hover {border-color:var(--badge-border)}
.faq-item summary {
  padding:20px 24px;cursor:pointer;
  font-size:16px;font-weight:500;
  list-style:none;
  display:flex;justify-content:space-between;align-items:center;
  transition:color .2s;
}
.faq-item summary::-webkit-details-marker {display:none}
.faq-item summary::after {
  content:'＋';color:var(--purple);font-size:20px;flex-shrink:0;
  transition:transform .2s;
}
.faq-item[open] summary::after {transform:rotate(45deg)}
.faq-item[open] summary {color:var(--purple)}
.faq-item p {
  padding:0 24px 20px;
  color:var(--text-muted);font-size:15px;line-height:1.8;
  animation:fadeIn .25s ease;
}
@keyframes fadeIn {from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}

/* HOT QUESTIONS GRID */
.hot-q-grid {
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
  gap:24px;
}
.hot-q-category {
  padding:32px 28px;border-radius:20px;
  background: var(--card-bg-grad);
  border:1px solid var(--card-border);
}
.hot-q-cat-title {
  font-size:17px;font-weight:600;margin:0 0 18px;
  color:var(--text-strong);
}
.hot-q-list {
  list-style:none;display:flex;flex-direction:column;gap:10px;
}
.hot-q-list li {
  font-size:14px;line-height:1.7;
  color:var(--text-muted);
  padding-left:18px;position:relative;
}
.hot-q-list li::before {
  content:'›';position:absolute;left:0;
  color:var(--purple);font-weight:700;font-size:16px;
}

/* CTA BANNER */
.cta-banner {
  position:relative;overflow:hidden;
  padding:120px 0;text-align:center;
  background:var(--cta-banner-bg);
  border-top:1px solid var(--cta-banner-border-top);
  border-bottom:1px solid var(--cta-banner-border-bottom);
}
.cta-banner .glow {z-index:0}
.cta-banner::before {
  content:'';position:absolute;inset:0;
  background-image:
    linear-gradient(var(--hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid-line) 1px, transparent 1px);
  background-size:40px 40px;
  opacity:0.7;
  pointer-events:none;
  z-index:0;
}
.cta-banner > .container {position:relative;z-index:5;pointer-events:auto}
.cta-banner .btn {position:relative;z-index:6;pointer-events:auto}
.cta-banner h2 {font-size:48px;font-weight:700;margin-bottom:16px}
.cta-banner p {color:var(--text-muted);font-size:18px;margin-bottom:40px}

/* FOOTER */
.footer {padding:48px 0;border-top:1px solid var(--footer-border)}
.footer-top {display:flex;align-items:center;gap:16px;margin-bottom:24px}
.footer-desc {color:var(--text-muted);font-size:13px;margin:0}
.footer-bottom {display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.footer-brand {display:flex;align-items:center;gap:10px;font-weight:600;font-size:16px}
.footer-copy {color:var(--footer-copy);font-size:13px;margin:0}
.footer-disclaimer {color:var(--footer-disclaimer);font-size:12px;margin:16px 0 0;line-height:1.7;max-width:880px}

/* PROOF STRIP */
.proof-strip {
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:100%;
}
.proof-strip div {
  padding:14px 16px;border-radius:14px;
  background:var(--proof-bg);
  border:1px solid var(--proof-border);
}
.proof-strip strong {display:block;font-size:13px;font-weight:700;margin-bottom:4px;color:var(--proof-strong)}
.proof-strip span {display:block;font-size:12px;color:var(--proof-text);line-height:1.5}

/* HERO PANEL */
.hero-panel {
  border-radius:24px;overflow:hidden;
  border:1px solid var(--hero-panel-border);
  background:var(--hero-panel-bg);
  backdrop-filter:blur(20px);
  box-shadow:var(--hero-panel-shadow);
  transform:rotate(2.5deg);
}
.preview-bar {
  display:flex;align-items:center;gap:8px;
  padding:12px 16px;
  background:var(--preview-bar-bg);
  border-bottom:1px solid var(--preview-bar-border);
}
.preview-dot {
  width:10px;height:10px;border-radius:50%;
  background:var(--preview-dot-idle);
}
.preview-dot:first-child {background:#ff5f57}
.preview-dot:nth-child(2) {background:#febc2e}
.preview-dot:nth-child(3) {background:#28c840}
.preview-title {
  flex:1;text-align:left;font-size:12px;
  color:var(--preview-title);letter-spacing:0.5px;
}
.preview-status {
  margin-left:auto;
  padding:4px 10px;border-radius:999px;
  color:var(--signal-text);font-size:11px;font-weight:700;
  background:var(--signal-bg);border:1px solid var(--signal-border);
}
.preview-body {padding:20px;display:flex;flex-direction:column;gap:12px}
.preview-msg {
  padding:12px 16px;border-radius:14px;
  font-size:14px;line-height:1.7;
}
.preview-msg.user {
  background:var(--preview-msg-user-bg);
  border:1px solid var(--preview-msg-user-border);
  color:var(--preview-msg-user-text);
  align-self:flex-end;max-width:80%;border-radius:14px 14px 4px 14px;
}
/* PRIVACY */
.privacy-section {padding:100px 0}
.privacy-heading {text-align:center;margin-bottom:60px}
.privacy-box {
  display:flex;align-items:flex-start;gap:20px;
  padding:32px 36px;border-radius:20px;
  background:var(--privacy-bg);
  border:1px solid var(--privacy-border);
}
.privacy-icon {font-size:32px;flex-shrink:0}
.privacy-content h3 {font-size:17px;font-weight:600;margin:0 0 10px;color:var(--text-strong)}
.privacy-content p {font-size:14px;line-height:1.8;color:var(--privacy-text);margin:0}

/* CONTRAST */
.contrast-grid {display:grid;grid-template-columns:1fr 1fr;gap:20px}
.contrast-card {padding:32px;border-radius:20px;border:1px solid var(--card-border)}
.contrast-bad {background:var(--contrast-bad-bg)}
.contrast-good {
  background:var(--contrast-good-bg);
  border-color:var(--contrast-good-border);
}
.contrast-label {display:block;font-size:13px;font-weight:700;margin-bottom:12px;color:var(--contrast-label)}
.contrast-good .contrast-label {color:var(--purple)}
.contrast-card p {color:var(--contrast-text);font-size:15px;line-height:1.8;margin:0}

/* RESPONSIVE (排序：宽 → 窄，避免后写的规则被更宽断点覆盖) */
@media(max-width:1024px) {
  .hero-inner {grid-template-columns:1fr 1fr;gap:32px}
  .proof-strip {grid-template-columns:1fr 1fr}
  .features-grid {grid-template-columns:repeat(2,1fr)}
}
@media(max-width:900px) {
  .hero-inner {grid-template-columns:1fr}
  .hero-copy {align-items:center;text-align:center}
  .hero-title::after {left:50%;transform:translateX(-50%)}
  .hero-title-line:nth-child(2) {margin-left:0;margin-top:0.02em}
  .hero-sub {max-width:100%}
  .hero-signal-card {max-width:560px}
  .hero-panel {transform:none;max-width:520px;margin:0 auto}
  .proof-strip {grid-template-columns:1fr}
}
@media(max-width:768px) {
  .hero {padding:120px 0 80px}
  .hero-inner {grid-template-columns:1fr}
  .hero-copy {align-items:center;text-align:center}
  .hero-sub {max-width:100%}
  .proof-strip {grid-template-columns:1fr}
  .contrast-grid {grid-template-columns:1fr}
  .step-arrow {transform:rotate(90deg)}
  .steps {flex-direction:column;align-items:stretch}
  .step {max-width:100%}
  .footer .container {flex-direction:column;text-align:center}
}

/* MOBILE NAV / HAMBURGER */
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:10px;
  background:transparent;border:1px solid var(--card-border);
  color:var(--text);cursor:pointer;align-items:center;justify-content:center;
  padding:0;
}
.nav-toggle:hover{border-color:var(--purple)}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:'';display:block;width:18px;height:2px;background:currentColor;border-radius:2px;
  position:relative;transition:transform .25s,top .25s,opacity .2s;
}
.nav-toggle span::before{position:absolute;top:-6px;left:0}
.nav-toggle span::after{position:absolute;top:6px;left:0}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

@media(max-width:768px){
  .nav-toggle{display:inline-flex}
  .nav-inner{gap:8px}
  .nav-brand{font-size:16px;gap:8px}
  .nav-logo{width:26px;height:26px}
  .nav-actions{gap:8px}
  .theme-toggle,.nav-toggle{width:40px;height:40px;border-radius:10px}
  .btn.nav-cta-compact{
    display:inline-flex;
    height:40px;
    min-height:40px;
    padding:0 12px;
    border-radius:10px;
    font-size:13px;
    font-weight:600;
    line-height:1;
    letter-spacing:0;
    box-shadow:none;
    flex-shrink:0;
  }
  .nav-cta-desktop{display:none}
  .nav-links{
    position:fixed;top:64px;left:0;right:0;
    flex-direction:column;gap:0;
    padding:8px 0 16px;
    background:var(--nav-mobile-menu-bg);
    backdrop-filter:blur(24px);
    border-bottom:1px solid var(--nav-mobile-menu-border);
    transform:translateY(-12px);opacity:0;pointer-events:none;
    transition:transform .25s,opacity .25s;
  }
  .nav-links a{
    padding:14px 24px;font-size:15px;color:var(--text);
    border-top:1px solid var(--nav-mobile-link-border);
  }
  .nav.open .nav-links{transform:translateY(0);opacity:1;pointer-events:auto}
  body.nav-open{overflow:hidden}
}
@media(min-width:769px){
  .nav-cta-compact{display:none}
}

/* ============== MOBILE DEEP OPTIMIZATION (≤768px) ============== */
@media(max-width:768px){
  /* 容器与基础排版 */
  .container{padding:0 16px}
  body{font-size:15px;line-height:1.65;-webkit-tap-highlight-color:transparent}

  /* 性能：弱化装饰性大模糊 + 网格背景，减少 paint */
  .glow{filter:blur(48px);opacity:.55}
  .glow-1{width:520px;height:520px;top:-180px;left:-160px}
  .glow-2{width:420px;height:420px;top:40px;right:-160px}
  .glow-3{width:480px;height:260px}
  .hero::before,.cta-banner::before{background-size:36px 36px;opacity:.5}

  /* NAV：收紧高度 + 更紧凑 brand */
  .nav{padding:12px 0}
  .nav-inner{padding:0 14px;gap:8px}
  .nav-brand{font-size:16px;gap:8px}
  .nav-logo{width:24px;height:24px}
  .nav-actions{gap:6px}
  .theme-toggle,.nav-toggle{width:40px;height:40px}
  .nav-links{top:60px}
  .nav-links a{padding:13px 20px;font-size:15px}

  /* HERO：信息密度优先，去多余空白 */
  .hero{padding:96px 0 56px}
  .hero-inner{gap:24px}
  .hero-title{font-size:44px;line-height:1.08;letter-spacing:0;margin-bottom:20px}
  .hero-title-line:nth-child(2){margin-left:0.32em;margin-top:0.04em}
  .hero-title::after{left:0.32em;transform:none;width:min(220px,56%);bottom:-8px}
  .hero-sub{font-size:15px;line-height:1.7;margin:0 0 24px;font-weight:400}
  .hero-sub br{display:none}
  .badge{margin-bottom:16px;padding:6px 14px;font-size:12px}
  .hero-signal-card{padding:14px;margin-bottom:22px;border-radius:18px;text-align:left}
  .hero-signal-top{align-items:flex-start;flex-direction:column;gap:8px}
  .hero-signal-grid{grid-template-columns:1fr;gap:8px}
  .hero-signal-item{min-height:0;padding:12px 14px;border-radius:14px}
  .hero-cta{margin-bottom:24px;width:100%;justify-content:center}
  .hero-cta .btn{width:100%;max-width:320px}

  /* HERO 右侧预览面板：移动端展示，但保持紧凑 */
  .hero-panel{
    display:block;width:100%;max-width:430px;margin:0 auto;
    transform:none;border-radius:20px;
  }
  .preview-bar{padding:10px 12px;gap:6px}
  .preview-dot{width:8px;height:8px}
  .preview-title{font-size:11.5px}
  .preview-status{padding:3px 8px;font-size:10.5px;white-space:nowrap}
  .preview-body{padding:14px;gap:10px}
  .preview-msg{font-size:13px;padding:10px 12px}
  .preview-msg.user{max-width:92%}
  .preview-diagnosis{margin:0;padding:12px;border-radius:16px}
  .preview-diagnosis .hero-signal-item{grid-template-columns:70px 1fr;padding:10px 11px}
  .preview-diagnosis .hero-signal-item strong,
  .preview-diagnosis .hero-signal-item span{font-size:12px}

  /* PROOF STRIP：单列但更紧凑，左对齐更好读 */
  .proof-strip{gap:8px}
  .proof-strip div{padding:12px 14px;text-align:left;border-radius:12px}
  .proof-strip strong{font-size:14px;margin-bottom:2px}
  .proof-strip span{font-size:12.5px}

  /* 通用 SECTION 收紧 */
  .section{padding:56px 0}
  .section-header{margin-bottom:32px}
  .section-title{font-size:28px;letter-spacing:0;margin-bottom:10px}
  .section-sub{font-size:14.5px;line-height:1.7;padding:0 4px}

  /* FEATURES：移动端两列,卡片更紧凑 */
  .features-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .feature-card{padding:16px 14px;border-radius:14px}
  .feature-card:hover{transform:none}
  .feature-head{margin-bottom:8px;gap:8px}
  .feature-icon{width:34px;height:34px;font-size:17px;border-radius:10px}
  .feature-card h3{font-size:14.5px;line-height:1.3}
  .feature-card p{font-size:12.5px;line-height:1.55}

  /* 移动端隐藏使用流程板块，顶部入口保持聚焦 */
  #how{display:none}

  /* HOT QUESTIONS：单列、收紧 */
  .hot-q-grid{grid-template-columns:1fr;gap:12px}
  .hot-q-category{padding:18px 16px;border-radius:16px}
  .hot-q-cat-title{font-size:15.5px;margin:0 0 12px}
  .hot-q-list{gap:8px}
  .hot-q-list li{font-size:13.5px;line-height:1.65;padding-left:16px}

  /* TESTIMONIALS：竖向单列,紧凑卡片 */
  .testimonials-grid{grid-template-columns:1fr;gap:12px}
  .testimonial-card{
    padding:18px 16px 16px;border-radius:16px;
    display:flex;flex-direction:column;gap:10px;
  }
  .testimonial-card::after{display:none}
  .testimonial-card p{
    font-size:14px;line-height:1.7;margin:0;
    font-style:normal;color:var(--text);
  }
  .stars{font-size:13px;margin:0;letter-spacing:1px}
  .testimonial-author{gap:10px;padding-top:10px;border-top:1px solid var(--card-border)}
  .avatar{width:34px;height:34px;font-size:14px}
  .testimonial-author strong{font-size:14px}
  .testimonial-author span{font-size:12px}

  /* CONTRAST：单列堆叠 */
  .contrast-grid{gap:12px}
  .contrast-card{padding:20px 18px;border-radius:16px}
  .contrast-card p{font-size:14px;line-height:1.7}

  /* PRIVACY：图标更小、padding 收紧 */
  .privacy-section{padding:56px 0}
  .privacy-heading{margin-bottom:24px}
  .privacy-box{padding:20px 18px;gap:14px;border-radius:16px}
  .privacy-icon{font-size:24px}
  .privacy-content h3{font-size:15.5px;margin:0 0 6px}
  .privacy-content p{font-size:13.5px;line-height:1.7}

  /* FAQ：tap 区 ≥44px、字号合理 */
  .faq-list{gap:8px}
  .faq-item summary{padding:16px 18px;font-size:14.5px;min-height:48px}
  .faq-item summary::after{font-size:18px}
  .faq-item p{padding:0 18px 16px;font-size:14px;line-height:1.75}

  /* CTA BANNER：缩短并强化 */
  .cta-banner{padding:64px 0}
  .cta-banner h2{font-size:30px;margin-bottom:10px}
  .cta-banner p{font-size:14.5px;margin-bottom:24px;padding:0 8px}
  .cta-banner .btn-lg{padding:14px 30px;font-size:15px;width:100%;max-width:320px}

  /* BUTTONS：保证 tap 区 ≥44px */
  .btn{min-height:44px;padding:12px 24px;font-size:14.5px}
  .btn-primary:hover{transform:none}
  .btn:active{transform:scale(0.97)}

  /* FOOTER：居中、收紧 */
  .footer{padding:32px 0 40px}
  .footer-top{flex-direction:column;text-align:center;gap:10px;margin-bottom:18px}
  .footer-bottom{flex-direction:column;align-items:center;text-align:center;gap:6px}
  .footer-copy{font-size:12.5px}
  .footer-disclaimer{font-size:11.5px;text-align:center;margin-top:14px}

}

/* 极窄屏微调 */
@media(max-width:380px){
  .container{padding:0 14px}
  .hero-title{font-size:38px}
  .nav-brand span{font-size:15px}
  .features-grid{grid-template-columns:1fr}
}

/* 减少动效偏好 */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}