/* ============================================================
 * Vexikey Web v1 — style.css
 * Linear / Apple Health 极简线性风
 * TODO: Corda 拍板主色方案（候选 A: 深靛蓝+荧光黄 · 候选 B: 深墨绿+电光青）
 * ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* --- 主色（候选 A: 深靛蓝 + 荧光黄，默认启用）--- */
  --color-primary: #1a1f36;
  --color-primary-hover: #0a0e27;
  --color-accent: #e0ff4c;
  --color-accent-strong: #c9ec2c;

  /* --- 候选 B: 深墨绿 + 电光青，切换时把候选 A 注释、下面 4 行取消注释 --- */
  /* --color-primary: #0f3d3e; */
  /* --color-primary-hover: #062727; */
  /* --color-accent: #00e5ff; */
  /* --color-accent-strong: #00c2d9; */

  --color-text: #0a0e27;
  --color-text-secondary: #5c6478;
  --color-text-tertiary: #8b93a7;
  --color-text-invert: #ffffff;

  --color-bg: #ffffff;
  --color-surface: #f7f8fa;
  --color-surface-2: #eff1f5;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;

  --color-work: #3b82f6;
  --color-dating: #ec4899;
  --color-social: #10b981;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(10, 14, 39, 0.04);
  --shadow-md: 0 4px 16px rgba(10, 14, 39, 0.06);
  --shadow-lg: 0 12px 40px rgba(10, 14, 39, 0.08);
  --shadow-hero: 0 40px 120px rgba(10, 14, 39, 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "PingFang SC", sans-serif;
  --font-mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, monospace;

  --container-width: 1200px;
  --container-narrow: 780px;
  --nav-height: 64px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
ul { padding: 0; margin: 0; list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; padding: 0; color: inherit; }
img { max-width: 100%; display: block; }
h1, h2, h3, h4, h5 { margin: 0; font-family: var(--font-display); letter-spacing: -0.02em; }
p { margin: 0; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow { max-width: var(--container-narrow); }

/* ============================================================
 * NAV
 * ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.nav-logo { width: 28px; height: 28px; border-radius: 6px; }
.nav-brand-text { color: var(--color-primary); }
.nav-links {
  display: flex;
  gap: 32px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--color-primary); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.lang-toggle {
  padding: 6px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: all 0.15s ease;
}
.lang-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* ============================================================
 * BUTTONS
 * ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  transition: all 0.18s ease;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-invert);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  background: var(--color-surface);
}
.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}
.btn-ghost:hover { color: var(--color-primary); }

/* ============================================================
 * HERO
 * ============================================================ */
.hero {
  padding: 80px 0 100px;
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-surface-2);
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}
.hero-title {
  font-size: 68px;
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero-title-accent {
  display: block;
  background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-accent-strong) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  font-size: 19px;
  line-height: 1.55;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
  max-width: 540px;
}
.hero-cta {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.hero-note {
  font-size: 13px;
  color: var(--color-text-tertiary);
}

/* --- Phone mockup（纯 CSS）--- */
.hero-mockup {
  display: flex;
  justify-content: center;
  align-items: center;
}
.phone {
  position: relative;
  width: 300px;
  height: 610px;
  background: var(--color-primary);
  border-radius: 44px;
  padding: 12px;
  box-shadow: var(--shadow-hero);
}
.phone-notch {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 26px;
  background: var(--color-primary);
  border-radius: 0 0 18px 18px;
  z-index: 3;
}
.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--color-bg);
  border-radius: 32px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.chat {
  padding: 40px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}
.msg {
  max-width: 78%;
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 13px;
  line-height: 1.4;
}
.msg-them {
  align-self: flex-start;
  background: var(--color-surface-2);
  color: var(--color-text);
  border-bottom-left-radius: 4px;
}
.msg-me {
  align-self: flex-end;
  background: var(--color-primary);
  color: var(--color-text-invert);
  border-bottom-right-radius: 4px;
}
.msg-me-polished {
  position: relative;
  animation: polishPulse 3s ease-in-out infinite;
}
@keyframes polishPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(224, 255, 76, 0); }
  50% { box-shadow: 0 0 0 4px rgba(224, 255, 76, 0.3); }
}

.keyboard {
  padding: 10px 8px 12px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}
.kb-bar {
  display: flex;
  gap: 6px;
  padding: 0 4px 8px;
  overflow-x: auto;
}
.kb-chip {
  padding: 4px 10px;
  font-size: 11px;
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  white-space: nowrap;
}
.kb-chip-active {
  background: var(--color-primary);
  color: var(--color-accent);
  border-color: var(--color-primary);
  font-weight: 500;
}
.kb-rows {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.kb-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}
.kb-row span {
  flex: 1;
  height: 32px;
  background: var(--color-bg);
  border-radius: 5px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
}
.kb-row-3 .kb-shift,
.kb-row-3 .kb-delete { flex: 1.4; background: var(--color-surface-2); }
.kb-row-4 .kb-num { flex: 1.5; background: var(--color-surface-2); font-size: 10px; display: flex; align-items: center; justify-content: center; color: var(--color-text-secondary); }
.kb-row-4 .kb-space { flex: 4; }
.kb-row-4 .kb-return { flex: 1.5; background: var(--color-surface-2); }

/* ============================================================
 * SOCIAL PROOF STRIP
 * ============================================================ */
.strip {
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}
.strip-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  color: var(--color-text-tertiary);
}
.strip-item { font-weight: 500; }
.strip-dot { color: var(--color-border-strong); }

/* ============================================================
 * SECTION 通用
 * ============================================================ */
.section {
  padding: 120px 0;
}
.section-alt { background: var(--color-surface); }
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 72px;
}
.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.section-title {
  font-size: 44px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

/* ============================================================
 * FEATURES
 * ============================================================ */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature {
  padding: 40px 32px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}
.feature:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: var(--color-surface);
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-icon-polish { color: var(--color-primary); }
.feature-icon-icebreak { color: var(--color-dating); background: rgba(236, 72, 153, 0.08); }
.feature-icon-basic { color: var(--color-work); background: rgba(59, 130, 246, 0.08); }

.feature-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-primary);
}
.feature-sub {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}
.feature-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* ============================================================
 * SCENARIOS
 * ============================================================ */
.scenarios {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.scenario-col {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.scenario-cat {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
}
.scenario-cat-label {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  letter-spacing: 0.04em;
}
.scenario-cat-work .scenario-cat-label { background: rgba(59, 130, 246, 0.1); color: var(--color-work); }
.scenario-cat-dating .scenario-cat-label { background: rgba(236, 72, 153, 0.1); color: var(--color-dating); }
.scenario-cat-social .scenario-cat-label { background: rgba(16, 185, 129, 0.1); color: var(--color-social); }
.scenario-list li {
  padding: 14px 24px;
  font-size: 15px;
  color: var(--color-text);
  border-top: 1px solid var(--color-border);
  transition: background 0.15s ease;
}
.scenario-list li:first-child { border-top: none; }
.scenario-list li:hover { background: var(--color-surface); }

/* ============================================================
 * PRICING
 * ============================================================ */
.pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.price-card {
  position: relative;
  padding: 36px 28px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}
.price-card:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}
.price-card-featured {
  border-color: var(--color-primary);
  border-width: 2px;
  box-shadow: var(--shadow-md);
}
.price-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  letter-spacing: 0.02em;
}
.price-badge-save {
  background: var(--color-surface-2);
  color: var(--color-text-secondary);
}
.price-plan {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 20px;
}
.price-amount {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.price-currency { font-size: 22px; font-weight: 500; }
.price-value { font-size: 48px; font-weight: 700; letter-spacing: -0.03em; }
.price-period { font-size: 15px; color: var(--color-text-secondary); font-weight: 500; margin-left: 4px; }
.price-trial {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}
.price-features {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}
.price-features li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text-secondary);
}
.price-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(-45deg);
}
.price-footnote {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin-top: 32px;
}

/* ============================================================
 * FAQ
 * ============================================================ */
.faq {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.faq-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.15s ease;
}
.faq-item[open] { border-color: var(--color-border-strong); }
.faq-item summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 56px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 300;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after {
  content: '−';
  color: var(--color-primary);
}
.faq-item p {
  padding: 0 24px 22px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ============================================================
 * CTA BANNER
 * ============================================================ */
.cta-banner {
  padding: 100px 0;
  background: var(--color-primary);
  color: var(--color-text-invert);
}
.cta-banner-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
}
.cta-banner-title {
  font-size: 44px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
  max-width: 700px;
}
.cta-banner .btn-primary {
  background: var(--color-accent);
  color: var(--color-primary);
}
.cta-banner .btn-primary:hover {
  background: var(--color-accent-strong);
}

/* ============================================================
 * FOOTER
 * ============================================================ */
.footer {
  padding: 72px 0 40px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 64px;
  margin-bottom: 56px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.footer-logo img { width: 28px; height: 28px; border-radius: 6px; }
.footer-tagline {
  font-size: 14px;
  color: var(--color-text-secondary);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-tertiary);
}
.footer-made { font-style: italic; }

/* ============================================================
 * LEGAL 页面（privacy.html / terms.html）
 * ============================================================ */
.legal {
  padding: 72px 0 100px;
  background: var(--color-bg);
}
.legal-header {
  text-align: center;
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}
.legal-title {
  font-size: 44px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  margin: 16px 0 12px;
}
.legal-meta {
  font-size: 14px;
  color: var(--color-text-tertiary);
}
.legal-section {
  margin-bottom: 40px;
}
.legal-section h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}
.legal-section h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 20px;
  margin-bottom: 8px;
}
.legal-section p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 14px;
}
.legal-section ul {
  padding-left: 20px;
  margin-bottom: 14px;
}
.legal-section ul li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}
.legal-section ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-border-strong);
}
.legal-section a {
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border-strong);
  transition: border-color 0.15s ease;
}
.legal-section a:hover { border-bottom-color: var(--color-primary); }

/* ============================================================
 * RESPONSIVE
 * ============================================================ */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-inner { gap: 12px; }
  .lang-toggle { display: inline-flex; }

  .hero { padding: 56px 0 72px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-title { font-size: 48px; }
  .hero-sub { font-size: 17px; }
  .hero-mockup { order: 2; }

  .section { padding: 80px 0; }
  .section-header { margin-bottom: 48px; }
  .section-title { font-size: 34px; }

  .features { grid-template-columns: 1fr; gap: 20px; }
  .scenarios { grid-template-columns: 1fr; gap: 16px; }
  .pricing { grid-template-columns: 1fr; gap: 20px; }
  .price-card-featured { order: -1; }

  .cta-banner { padding: 72px 0; }
  .cta-banner-title { font-size: 32px; }

  .footer-inner { grid-template-columns: 1fr; gap: 40px; margin-bottom: 40px; }
  .footer-cols { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .legal { padding: 48px 0 72px; }
  .legal-title { font-size: 32px; }
}

@media (max-width: 560px) {
  .hero-title { font-size: 40px; }
  .section-title { font-size: 28px; }
  .cta-banner-title { font-size: 26px; }
  .footer-cols { grid-template-columns: 1fr; gap: 32px; }
  .price-value { font-size: 40px; }
  .container { padding: 0 20px; }
}

/* ============================================================
 * PRINT
 * ============================================================ */
@media print {
  .nav, .footer, .cta-banner { display: none; }
  body { color: #000; background: #fff; }
}