/* ==========================================================================
   LỜI XƯA — DESIGN SYSTEM & STYLESHEET
   Aesthetic: Heritage Vietnamese Typography, Lacquer Cinnabar, Imperial Amber,
   Warm Dó Paper, Sleek Glassmorphism & Micro-animations.
   ========================================================================== */

:root {
  /* Color Tokens */
  --color-cinnabar: #8C3826;
  --color-cinnabar-hover: #742C1D;
  --color-cinnabar-light: rgba(140, 56, 38, 0.08);
  --color-cinnabar-border: rgba(140, 56, 38, 0.22);
  
  --color-amber: #B68334;
  --color-amber-dark: #8C5E24;
  --color-amber-light: rgba(182, 131, 52, 0.12);
  
  --color-bamboo: #3A694D;
  --color-bamboo-light: rgba(58, 105, 77, 0.12);
  
  --color-bg: #FAF7F2;
  --color-bg-alt: #F3ECE1;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-border: #E8DFD3;
  --color-border-subtle: #F0EAE1;
  
  --color-text: #2C2623;
  --color-text-secondary: #6B625B;
  --color-text-muted: #9C938B;
  
  /* Typography */
  --font-serif: 'Playfair Display', 'Cinzel', Georgia, 'Times New Roman', serif;
  --font-sans: 'Be Vietnam Pro', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(44, 38, 35, 0.04);
  --shadow-md: 0 8px 24px rgba(44, 38, 35, 0.06);
  --shadow-lg: 0 16px 40px rgba(44, 38, 35, 0.09);
  --shadow-accent: 0 10px 28px rgba(140, 56, 38, 0.25);
  
  /* Spacing */
  --container-max: 1160px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(182, 131, 52, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(140, 56, 38, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 247, 242, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.brand-tag {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-amber-dark);
  background: var(--color-amber-light);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-cinnabar);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-cinnabar);
  color: #FFFFFF !important;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(140, 56, 38, 0.28);
}

.nav-cta:hover {
  background: var(--color-cinnabar-hover);
  transform: translateY(-1px);
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

/* Hero Section */
.hero {
  padding: 72px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-amber-light);
  color: var(--color-amber-dark);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 4.2vw, 3.6rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title span {
  color: var(--color-cinnabar);
}

.hero-desc {
  font-size: 1.12rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #9E3B27, #802A19);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-accent);
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(140, 56, 38, 0.35);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  font-size: 1rem;
  padding: 13px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.btn-secondary:hover {
  background: #FFF;
  border-color: var(--color-amber);
  color: var(--color-cinnabar);
}

.hero-badges {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.86rem;
  color: var(--color-text-muted);
}

.hero-badge-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-badge-item svg {
  color: var(--color-bamboo);
}

/* Hero Interactive Saying Card (Visual Mockup) */
.hero-visual {
  position: relative;
  perspective: 1000px;
}

.mockup-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(182, 131, 52, 0.1);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.mockup-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-cinnabar), var(--color-amber), var(--color-bamboo));
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.tag-pill {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-cinnabar);
  background: var(--color-cinnabar-light);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.card-seal {
  width: 32px;
  height: 32px;
  background: var(--color-cinnabar);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-family: var(--font-serif);
  font-size: 0.62rem;
  font-weight: 800;
  line-height: 1;
  text-align: center;
  box-shadow: 0 2px 6px rgba(140, 56, 38, 0.3);
}

.card-poem {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.6;
  text-align: center;
  color: var(--color-text);
  margin-bottom: 24px;
  padding: 12px 8px;
}

.card-meaning {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-subtle);
  margin-bottom: 20px;
}

.card-meaning strong {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-amber-dark);
  margin-bottom: 4px;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--color-border-subtle);
}

.card-meta {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.card-buttons {
  display: flex;
  gap: 8px;
}

.mini-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--color-text-secondary);
}

.mini-btn:hover {
  background: var(--color-cinnabar-light);
  color: var(--color-cinnabar);
  border-color: var(--color-cinnabar-border);
}

/* Section Common */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-kicker {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-cinnabar);
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
}

/* Feature 4-Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(182, 131, 52, 0.35);
}

.feature-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.icon-cinnabar { background: var(--color-cinnabar-light); color: var(--color-cinnabar); }
.icon-amber { background: var(--color-amber-light); color: var(--color-amber-dark); }
.icon-bamboo { background: var(--color-bamboo-light); color: var(--color-bamboo); }
.icon-indigo { background: rgba(43, 76, 111, 0.12); color: #2B4C6F; }

.feature-title {
  font-family: var(--font-serif);
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Deep Dive Row Section */
.deep-dive {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
  margin-bottom: 80px;
}

.deep-dive.reverse {
  direction: rtl;
}

.deep-dive.reverse > * {
  direction: ltr;
}

.deep-dive-content h3 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.deep-dive-content p {
  font-size: 1.02rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.feature-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--color-text);
}

.feature-checklist svg {
  color: var(--color-bamboo);
  flex-shrink: 0;
  margin-top: 3px;
}

.preview-box {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 36px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  text-align: center;
}

/* Stats Ribbon */
.stats-ribbon {
  background: linear-gradient(135deg, #321A14, #1E120F);
  color: #FFFFFF;
  padding: 48px 0;
  border-radius: var(--radius-xl);
  margin: 40px 0 80px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: #F7D7A0;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.75);
}

/* Privacy & Trust Banner */
.trust-banner {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  margin: 40px 0;
}

.trust-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--color-bamboo-light);
  color: var(--color-bamboo);
  display: flex;
  align-items: center;
  justify-content: center;
}

.trust-content h3 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.trust-content p {
  color: var(--color-text-secondary);
  font-size: 0.98rem;
}

/* Footer */
.site-footer {
  background: #201A18;
  color: #EDE4D8;
  padding: 64px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h4 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: #FFF;
  margin-bottom: 12px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.92rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #F7D7A0;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.92rem;
}

.footer-links a:hover {
  color: #FFF;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ==========================================================================
   PAGE: PRIVACY POLICY & SUPPORT SPECIFIC STYLES
   ========================================================================== */

.page-header {
  padding: 60px 0 40px;
  text-align: center;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 3.8vw, 3rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto;
}

.doc-layout {
  padding: 60px 0 100px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
}

.doc-nav {
  position: sticky;
  top: 94px;
  align-self: start;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.doc-nav h4 {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-amber-dark);
  margin-bottom: 14px;
}

.doc-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.doc-nav-list a {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  display: block;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

.doc-nav-list a:hover {
  color: var(--color-cinnabar);
  background: var(--color-cinnabar-light);
}

.doc-body {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 48px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.doc-section {
  margin-bottom: 44px;
  scroll-margin-top: 100px;
}

.doc-section h2 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.doc-section p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.doc-highlight-box {
  background: var(--color-bg);
  border-left: 4px solid var(--color-cinnabar);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 24px;
  margin: 20px 0;
}

.doc-highlight-box.green {
  border-left-color: var(--color-bamboo);
}

.doc-highlight-box p {
  margin-bottom: 0;
  color: var(--color-text);
  font-weight: 500;
}

/* Support FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
}

.faq-question:hover {
  color: var(--color-cinnabar);
}

.faq-chevron {
  transition: transform 0.25s ease;
  color: var(--color-text-muted);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-cinnabar);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 24px;
  color: var(--color-text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* Contact Card */
.contact-box {
  background: linear-gradient(135deg, rgba(140, 56, 38, 0.04), rgba(182, 131, 52, 0.04));
  border: 1px solid var(--color-cinnabar-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 36px;
}

.email-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--color-surface);
  padding: 10px 18px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-cinnabar);
  margin-top: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.email-pill:hover {
  border-color: var(--color-cinnabar);
  transform: scale(1.02);
}

/* Toast Message */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #2C2623;
  color: #FFF;
  padding: 12px 22px;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 500;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
  transform: translateY(100px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-badges {
    justify-content: center;
  }
  
  .deep-dive,
  .deep-dive.reverse {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
  
  .trust-banner {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
  
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .doc-layout {
    grid-template-columns: 1fr;
  }
  
  .doc-nav {
    display: none;
  }
}

@media (max-width: 680px) {
  .nav-links {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  
  .doc-body {
    padding: 24px 20px;
  }
}