/* ==========================================================================
   SOI QUÁN — ONE-PAGE STYLESHEET
   Design System: Editorial, Brutalist-Refined, Anti-Slop
   Complies with: DESIGN_RULES.md, brief.md & Roy's Web Guidelines
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Theme Variables
   -------------------------------------------------------------------------- */
:root {
  /* Light Theme (Default) */
  --bg-main: #F3EEE4;
  --bg-surface: #FBF8F2;
  --bg-surface-alt: #ECE5D7;
  --text-main: #10201E;
  --text-muted: #4A5754;
  --text-subtle: #6F7D7A;

  --accent-teal: #1F5E5B;
  --accent-teal-hover: #164643;
  --accent-teal-light: #4E9C93;
  --accent-teal-soft: rgba(31, 94, 91, 0.08);

  --accent-coral: #E4572E;
  --accent-coral-hover: #CB451E;
  --accent-coral-soft: rgba(228, 87, 46, 0.1);
  --button-coral: #C2410C;
  --button-coral-hover: #9A3412;
  --button-coral-text: #FFFFFF;

  --accent-yellow: #D99A2B;
  --accent-yellow-soft: rgba(217, 154, 43, 0.12);

  --border-line: #E2DCD2;
  --border-strong: #C8BFB2;

  --font-serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-sans: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --container-max: 1080px;
  --container-narrow: 760px;
  --container-pad: 20px;
  --bottom-bar-height: 60px;
  --radius-sm: 4px;
  --radius-xs: 2px;
  --transition-fast: 180ms ease;
}

[data-theme="dark"] {
  --bg-main: #0D1716;
  --bg-surface: #142220;
  --bg-surface-alt: #1A2B29;
  --text-main: #ECE6D9;
  --text-muted: #9AA7A4;
  --text-subtle: #728481;

  --accent-teal: #6FBDB2;
  --accent-teal-hover: #8DD2C8;
  --accent-teal-light: #4E9C93;
  --accent-teal-soft: rgba(111, 189, 178, 0.12);

  --accent-coral: #F06A43;
  --accent-coral-hover: #FFA082;
  --accent-coral-soft: rgba(240, 106, 67, 0.15);
  --button-coral: var(--accent-coral);
  --button-coral-hover: var(--accent-coral-hover);
  --button-coral-text: #0D1716;

  --accent-yellow: #E5B348;
  --accent-yellow-soft: rgba(229, 179, 72, 0.15);

  --border-line: #223432;
  --border-strong: #334D4A;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-main);
  -webkit-font-smoothing: antialiased;
  padding-bottom: 0;
  overflow-x: hidden;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

@media (max-width: 768px) {
  body {
    padding-bottom: var(--bottom-bar-height);
  }
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--text-main);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

p {
  margin-bottom: 0.85rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent-coral);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.container-narrow {
  max-width: var(--container-narrow);
}

.text-center {
  text-align: center;
}

/* --------------------------------------------------------------------------
   3. Buttons & Interactive Primitives
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.btn:active {
  transform: translateY(1px);
}

.btn .icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background-color: var(--accent-teal);
  color: #FFFFFF;
  border-color: var(--accent-teal);
}

.btn-primary:hover {
  background-color: var(--accent-teal-hover);
  border-color: var(--accent-teal-hover);
  color: #FFFFFF;
}

[data-theme="dark"] .btn-primary {
  background-color: var(--accent-teal);
  color: #0D1716;
  border-color: var(--accent-teal);
}

[data-theme="dark"] .btn-primary:hover {
  background-color: var(--accent-teal-hover);
  border-color: var(--accent-teal-hover);
  color: #0D1716;
}

.btn-accent {
  background-color: var(--button-coral);
  color: var(--button-coral-text);
  border-color: var(--button-coral);
}

.btn-accent:hover {
  background-color: var(--button-coral-hover);
  border-color: var(--button-coral-hover);
  color: var(--button-coral-text);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border-color: var(--border-strong);
}

.btn-outline:hover {
  background-color: var(--bg-surface);
  border-color: var(--text-main);
}

.btn-lg {
  min-height: 48px;
  padding: 0 24px;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

/* --------------------------------------------------------------------------
   4. Site Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-line);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-xs);
}

.brand-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--text-main);
  border-bottom-color: var(--accent-teal);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle Button */
.btn-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  padding: 0;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  color: var(--text-main);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-theme-toggle:hover {
  border-color: var(--text-main);
}

.btn-theme-toggle .icon {
  width: 20px;
  height: 20px;
}

.btn-theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .btn-theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .btn-theme-toggle .icon-moon {
  display: block;
}

.header-cta {
  min-height: 40px;
  padding: 0 16px;
  font-size: 0.875rem;
}

@media (max-width: 860px) {
  .nav-desktop, .header-cta {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   5. Section Headers & Tags
   -------------------------------------------------------------------------- */
.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-teal);
  background-color: var(--accent-teal-soft);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  margin-bottom: 12px;
  border: 1px solid var(--border-line);
}

[data-theme="dark"] .section-tag {
  color: var(--accent-teal);
  background-color: var(--accent-teal-soft);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 32px;
}

.text-center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.section-hero {
  padding: 56px 0 64px 0;
  border-bottom: 1px solid var(--border-line);
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-coral);
}

.hero-title {
  font-size: 2.625rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  line-height: 1.18;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--accent-teal);
  margin-bottom: 16px;
  line-height: 1.4;
}

.hero-tagline em {
  font-style: italic;
  color: var(--accent-coral);
  font-weight: 600;
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.hero-highlights {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  padding: 16px 20px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.highlight-item strong {
  color: var(--text-main);
}

.highlight-item .icon-check {
  width: 18px;
  height: 18px;
  color: var(--accent-teal);
  flex-shrink: 0;
  margin-top: 3px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Hero Visual: Lens Artboard with SVG Wave Animation */
.hero-visual {
  display: flex;
  justify-content: center;
}

.lens-artboard {
  width: 100%;
  max-width: 360px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  padding: 24px;
  text-align: center;
}

.lens-svg {
  width: 100%;
  height: auto;
}

.lens-bg-card {
  fill: var(--bg-surface-alt);
}

.lens-glass-bg {
  fill: var(--bg-main);
}

.lens-coral-dot {
  fill: var(--accent-coral);
}

.lens-coral-reflection {
  fill: var(--accent-coral);
  opacity: 0.45;
}

.wave-path-back {
  fill: var(--accent-teal-light);
  opacity: 0.55;
  animation: waveBack 8s linear infinite;
}

.wave-path-front {
  fill: var(--accent-teal);
  animation: waveFront 5s linear infinite;
}

@keyframes waveBack {
  0% { transform: translateX(0); }
  100% { transform: translateX(240px); }
}

@keyframes waveFront {
  0% { transform: translateX(0); }
  100% { transform: translateX(-240px); }
}

@media (prefers-reduced-motion: reduce) {
  .wave-path-back, .wave-path-front {
    animation: none !important;
  }
}

.lens-caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--text-subtle);
  border-top: 1px solid var(--border-line);
  padding-top: 12px;
}

.live-pulse {
  color: var(--accent-teal);
  font-weight: 600;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual {
    order: -1;
  }
  .lens-artboard {
    max-width: 280px;
  }
  .hero-title {
    font-size: 2.125rem;
  }
}

/* --------------------------------------------------------------------------
   7. Interactive Quiz Tool: "Soi thử quán"
   -------------------------------------------------------------------------- */
.section-tool {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
}

.tool-card {
  max-width: var(--container-narrow);
  margin: 0 auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.quiz-progress-bar-wrap {
  width: 100%;
  height: 6px;
  background-color: var(--bg-surface-alt);
}

.quiz-progress-bar {
  height: 100%;
  background-color: var(--accent-teal);
  transition: width 240ms ease;
}

.quiz-step {
  padding: 36px 32px 32px 32px;
}

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

.quiz-step-label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.btn-quiz-back {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text-subtle);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  transition: color var(--transition-fast);
}

.btn-quiz-back:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn-quiz-back:not(:disabled):hover {
  color: var(--text-main);
  background-color: var(--bg-surface-alt);
}

.quiz-question-wrapper {
  min-height: 80px;
  display: flex;
  align-items: center;
  margin-bottom: 32px;
}

.quiz-question {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-main);
  transition: opacity 150ms ease, transform 150ms ease;
}

.quiz-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btn-quiz {
  min-height: 54px;
  font-size: 1.0625rem;
  border: 1px solid var(--border-strong);
  background-color: var(--bg-main);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-fast);
}

.btn-quiz-yes:hover {
  background-color: var(--accent-teal);
  border-color: var(--accent-teal);
  color: #FFFFFF;
}

[data-theme="dark"] .btn-quiz-yes:hover {
  background-color: var(--accent-teal);
  color: #0D1716;
}

.btn-quiz-no:hover {
  background-color: var(--bg-surface-alt);
  border-color: var(--text-main);
}

/* Quiz Result Container */
.quiz-result {
  padding: 36px 32px;
  transition: opacity 250ms ease;
}

.quiz-step.is-hidden,
.quiz-result.is-hidden {
  display: none;
}

.result-header {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-line);
}

.gauge-container {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto;
}

.gauge-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

#gauge-circle-bar {
  transition: stroke-dashoffset 600ms ease;
}

.gauge-inner-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.gauge-number {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
}

.gauge-denom {
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: block;
}

.result-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  margin-bottom: 8px;
  background-color: var(--accent-coral-soft);
  color: var(--accent-coral);
  border: 1px solid var(--accent-coral);
}

.result-title {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.result-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.result-cta-box {
  background-color: var(--bg-main);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.result-cta-text strong {
  display: block;
  font-size: 1.0625rem;
  color: var(--text-main);
  margin-bottom: 6px;
}

.result-cta-text p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.result-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

#btn-zalo-result {
  max-width: 100%;
  white-space: normal;
  text-align: center;
}

@media (max-width: 600px) {
  .quiz-step, .quiz-result {
    padding: 24px 18px;
  }
  .quiz-actions {
    grid-template-columns: 1fr;
  }
  .result-header {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   8. Showcase Section (Bản mẫu)
   -------------------------------------------------------------------------- */
.section-showcase {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.showcase-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.showcase-card-featured {
  border-color: var(--accent-teal);
  background-color: var(--bg-surface);
}

.card-badge-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.badge-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-coral);
  background-color: var(--accent-coral-soft);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.badge-category {
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-grow: 0;
}

/* Mockup Frame */
.mockup-frame {
  background-color: var(--bg-main);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 20px;
  font-size: 0.8125rem;
}

.mockup-header-bar {
  background-color: var(--bg-surface-alt);
  padding: 6px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border-line);
}

.mockup-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--border-strong);
}

.live-indicator {
  background-color: #2ECC71;
}

.mockup-url {
  font-family: monospace;
  font-size: 0.6875rem;
  color: var(--text-subtle);
}

.mockup-body {
  padding: 14px;
}

.mockup-hero-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.mockup-text-bold {
  font-weight: 700;
  color: var(--text-main);
  font-size: 0.875rem;
}

.mockup-text-sm {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mockup-pill-open {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent-teal);
  background-color: var(--accent-teal-soft);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

.mockup-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.mockup-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed var(--border-line);
  padding-bottom: 4px;
}

.mockup-item strong {
  color: var(--text-main);
}

.mockup-cta-row {
  display: flex;
  gap: 8px;
}

.mockup-btn-primary {
  display: inline-block;
  background-color: var(--accent-teal);
  color: #FFFFFF;
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 600;
}

[data-theme="dark"] .mockup-btn-primary {
  color: #0D1716;
}

.mockup-btn-tel {
  display: inline-block;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
}

/* Centered Live Preview Box */
.mockup-body-centered {
  padding: 24px 16px;
  text-align: center;
}

.mockup-live-tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-teal);
  background-color: var(--accent-teal-soft);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  margin-bottom: 8px;
}

.mockup-live-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.card-features {
  margin-top: auto;
  border-top: 1px solid var(--border-line);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-features li {
  font-size: 0.8125rem;
  color: var(--text-muted);
  position: relative;
  padding-left: 14px;
}

.card-features li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent-teal);
}

@media (max-width: 960px) {
  .showcase-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   9. Process Section (Quy trình 4 bước)
   -------------------------------------------------------------------------- */
.section-process {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.process-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 24px;
  position: relative;
}

.process-step-num {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--accent-teal);
  line-height: 1;
  margin-bottom: 16px;
}

.process-title {
  font-size: 1.125rem;
  margin-bottom: 10px;
}

.process-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 900px) {
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .process-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   10. Pricing Section
   -------------------------------------------------------------------------- */
.section-pricing {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
}

.pricing-card-featured {
  border-color: var(--accent-teal);
  background-color: var(--bg-surface);
  box-shadow: 0 0 0 1px var(--accent-teal);
}

.pricing-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-teal);
  margin-bottom: 10px;
}

.pricing-badge-popular {
  color: var(--accent-coral);
  background-color: var(--accent-coral-soft);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  display: inline-block;
  width: fit-content;
}

.pricing-name {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 4px;
}

.price-from {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.price-amount {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
}

.price-unit {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 600;
}

.pricing-subtext {
  font-size: 0.8125rem;
  color: var(--text-subtle);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-line);
}

.pricing-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 1rem;
  color: var(--text-muted);
}

.pricing-list .icon-check {
  width: 16px;
  height: 16px;
  color: var(--accent-teal);
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-footer {
  margin-top: auto;
}

.pricing-status-tag {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-subtle);
  margin-bottom: 8px;
}

.pricing-note {
  display: block;
  font-size: 0.75rem;
  color: var(--text-subtle);
  margin-top: 8px;
  line-height: 1.4;
}

@media (max-width: 960px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   11. FAQ Section (Native details/summary)
   -------------------------------------------------------------------------- */
.section-faq {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-item[open] {
  border-color: var(--border-strong);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 18px;
  height: 18px;
  color: var(--text-subtle);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--accent-teal);
}

.faq-answer {
  padding: 0 20px 20px 20px;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. Contact Section
   -------------------------------------------------------------------------- */
.section-contact {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
}

.contact-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 40px 32px;
  text-align: center;
}

.contact-title {
  font-size: 2rem;
  margin-bottom: 12px;
}

.contact-desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 32px auto;
}

.contact-methods {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  text-align: left;
}

.contact-box {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background-color: var(--bg-main);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.contact-box:hover {
  border-color: var(--text-main);
  background-color: var(--bg-surface-alt);
}

.contact-box-highlight {
  border-color: var(--accent-teal);
}

.contact-box-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-xs);
  color: var(--accent-teal);
  flex-shrink: 0;
}

.contact-box-content {
  flex-grow: 1;
}

.contact-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-subtle);
  margin-bottom: 2px;
}

.contact-value {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-main);
}

.contact-arrow {
  font-size: 1.25rem;
  color: var(--text-subtle);
  transition: transform var(--transition-fast);
}

.contact-box:hover .contact-arrow {
  transform: translateX(4px);
  color: var(--accent-teal);
}

@media (max-width: 700px) {
  .contact-methods {
    grid-template-columns: 1fr;
  }
  .contact-card {
    padding: 28px 20px;
  }
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-line);
  padding: 48px 0 24px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  margin-bottom: 12px;
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-network {
  font-size: 0.8125rem;
  color: var(--text-subtle);
}

.footer-heading {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent-teal);
}

.footer-meta-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-subtle);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border-line);
  font-size: 0.8125rem;
  color: var(--text-subtle);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.back-to-top:hover {
  color: var(--accent-teal);
}

.back-to-top .icon {
  width: 14px;
  height: 14px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* --------------------------------------------------------------------------
   14. Mobile Sticky Bottom Bar (Ngoại lệ: Chỉ gồm 2 nút)
   -------------------------------------------------------------------------- */
.mobile-sticky-bar {
  display: none;
}

@media (max-width: 768px) {
  .mobile-sticky-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-strong);
    padding: 8px 16px calc(8px + env(safe-area-inset-bottom, 0px)) 16px;
    gap: 12px;
  }

  .sticky-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 44px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    text-decoration: none;
  }

  .sticky-btn .icon {
    width: 18px;
    height: 18px;
  }

  .sticky-btn-tool {
    background-color: var(--bg-main);
    color: var(--text-main);
    border: 1px solid var(--border-strong);
  }

  .sticky-btn-zalo {
    background-color: var(--accent-teal);
    color: #FFFFFF;
    border: 1px solid var(--accent-teal);
  }

  [data-theme="dark"] .sticky-btn-zalo {
    color: #0D1716;
  }
}

/* --------------------------------------------------------------------------
   15. Scroll Reveal Animations (IntersectionObserver)
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 300ms ease, transform 300ms ease;
  will-change: opacity, transform;
}

.reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}


/* ==========================================================================
   16. Water Canvas Background
   ========================================================================== */
.water-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  display: block;
}

/* Make body content sit above canvas */
body > *:not(.water-bg):not(.site-header):not(.mobile-sticky-bar) {
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   17. Tilt Cards with Shine
   ========================================================================== */
.showcase-card,
.process-card,
.pricing-card {
  transform: perspective(800px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transition: transform 400ms cubic-bezier(.2,.8,.2,1), box-shadow 300ms ease, border-color 180ms ease;
  will-change: transform;
  position: relative;
  overflow: hidden;
}

.showcase-card::before,
.process-card::before,
.pricing-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at var(--mx, 50%) var(--my, 50%),
    rgba(255,255,255,0.13) 0%,
    transparent 60%
  );
  opacity: 0;
  transition: opacity 300ms ease;
  pointer-events: none;
  z-index: 1;
  border-radius: inherit;
}

.showcase-card:hover::before,
.process-card:hover::before,
.pricing-card:hover::before {
  opacity: 1;
}

@media (hover: none) {
  .showcase-card,
  .process-card,
  .pricing-card {
    transform: none !important;
  }
  .showcase-card::before,
  .process-card::before,
  .pricing-card::before {
    display: none;
  }
}

/* ==========================================================================
   18. Button Ripple & Hover Lift
   ========================================================================== */
.btn {
  position: relative;
  overflow: hidden;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.10);
}

.btn:active {
  transform: translateY(1px) !important;
  box-shadow: none !important;
}

.btn.pressing {
  transform: scale(0.94) !important;
}

.ripple {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  transform: scale(0);
  animation: rippleExpand 700ms ease-out forwards;
  pointer-events: none;
  z-index: 10;
  margin-left: -2px;
  margin-top: -2px;
}

@keyframes rippleExpand {
  0%   { transform: scale(0);   opacity: 0.7; }
  60%  { opacity: 0.4; }
  100% { transform: scale(80);  opacity: 0; }
}

/* Ripple on dark/outline buttons */
.btn-outline .ripple,
.btn-quiz .ripple {
  background: rgba(31, 94, 91, 0.25);
}

/* ==========================================================================
   19. Enhanced Scroll Reveal (Stagger Children)
   ========================================================================== */
[data-reveal-child] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms cubic-bezier(.2,.8,.2,1), transform 420ms cubic-bezier(.2,.8,.2,1);
  will-change: opacity, transform;
}

[data-reveal-child].child-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Word-by-word title reveal */
.word-reveal {
  display: inline-block;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 400ms cubic-bezier(.2,.8,.2,1), transform 400ms cubic-bezier(.2,.8,.2,1);
  will-change: opacity, transform;
  white-space: pre-wrap;
}

.word-reveal.word-in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal-child],
  .word-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ==========================================================================
   20. Hero Parallax Lens
   ========================================================================== */
.lens-artboard {
  transition: transform 80ms linear;
  will-change: transform;
}

/* ==========================================================================
   21. Water Level Bar (in hero lens caption)
   ========================================================================== */
.water-level-bar-wrap {
  width: 60px;
  height: 4px;
  background-color: var(--border-line);
  border-radius: 2px;
  overflow: hidden;
  display: inline-block;
  vertical-align: middle;
  margin-left: 8px;
}

.water-level-bar {
  height: 100%;
  background-color: var(--accent-teal);
  border-radius: 2px;
  width: 0%;
  transition: width 400ms ease;
}

/* ==========================================================================
   22. Quiz Slide Transition
   ========================================================================== */
.quiz-question-wrapper {
  overflow: hidden;
}

/* ==========================================================================
   23. Quiz Result Bubbles
   ========================================================================== */
.quiz-bubble {
  position: absolute;
  border-radius: 50%;
  background-color: var(--accent-teal);
  opacity: 0.55;
  pointer-events: none;
  animation: bubbleFloat 1.8s ease-out forwards;
}

@keyframes bubbleFloat {
  0%   { transform: translateY(0) scale(1); opacity: 0.55; }
  80%  { opacity: 0.2; }
  100% { transform: translateY(-80px) scale(0.6); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .quiz-bubble {
    display: none;
  }
}

/* ==========================================================================
   24. FAQ Smooth Accordion
   ========================================================================== */
.faq-answer {
  overflow: hidden;
}

/* ==========================================================================
   25. Mockup Interactive Items
   ========================================================================== */
.mockup-item {
  cursor: pointer;
  border-radius: var(--radius-xs);
  padding: 4px 6px 4px 6px;
  padding-bottom: 4px;
  transition: background-color 180ms ease;
  position: relative;
}

.mockup-item:hover {
  background-color: var(--accent-teal-soft);
}

.mockup-item.selected {
  background-color: var(--accent-teal-soft);
  border-bottom-color: var(--accent-teal);
}

.mockup-item.selected::after {
  content: '';
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--accent-teal);
  border-bottom: 2px solid var(--accent-teal);
  transform: rotate(45deg) translateY(-2px);
  margin-left: 6px;
  flex-shrink: 0;
}

.mockup-item {
  display: flex;
  align-items: center;
}

.mockup-item span {
  flex-grow: 1;
}

.mockup-total-row {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-main);
}

.mockup-total-amount {
  color: var(--accent-teal);
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-weight: 700;
}

/* ==========================================================================
   26. Cursor Trail Dot
   ========================================================================== */
#sq-cursor-dot {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-teal);
  opacity: 0.45;
  pointer-events: none;
  z-index: 2;
  transform: translate(-50%, -50%);
  transition: opacity 200ms ease;
  will-change: transform;
}

#sq-cursor-dot.cursor-hidden {
  opacity: 0;
}

@media (hover: none) {
  #sq-cursor-dot {
    display: none;
  }
}

/* ==========================================================================
   27. Transparent Section Backgrounds (let water show through)
   ========================================================================== */
/* Keep headers/nav solid, make section interiors translucent */
.site-header {
  background-color: rgba(243, 238, 228, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

[data-theme="dark"] .site-header {
  background-color: rgba(13, 23, 22, 0.92);
}

/* Sections: keep border-bottom but lighten bg slightly */
.section-hero {
  background-color: transparent;
}

.section-tool {
  background-color: transparent;
}

.section-showcase {
  background-color: transparent;
}

.section-process {
  background-color: transparent;
}

.section-pricing {
  background-color: transparent;
}

.section-faq {
  background-color: transparent;
}

.section-contact {
  background-color: transparent;
}

/* Cards keep their bg so text is readable (WCAG AA) */
.tool-card,
.showcase-card,
.process-card,
.pricing-card,
.faq-item,
.contact-card,
.hero-highlights,
.lens-artboard {
  /* keep existing bg-surface color — this ensures contrast */
}

.site-footer {
  background-color: rgba(243, 238, 228, 0.96);
}

[data-theme="dark"] .site-footer {
  background-color: rgba(20, 34, 32, 0.96);
}

.mobile-sticky-bar {
  background-color: rgba(251, 248, 242, 0.96) !important;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

[data-theme="dark"] .mobile-sticky-bar {
  background-color: rgba(20, 34, 32, 0.96) !important;
}

/* ==========================================================================
   28. Reduced Motion Master Switch
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn:hover:not(:disabled) {
    transform: none;
    box-shadow: none;
  }
  .ripple {
    animation: none;
    display: none;
  }
  .showcase-card,
  .process-card,
  .pricing-card {
    transform: none !important;
    transition: background-color 180ms ease, border-color 180ms ease !important;
  }
  .showcase-card::before,
  .process-card::before,
  .pricing-card::before {
    display: none;
  }
  .water-level-bar {
    transition: none;
  }
  .faq-answer {
    transition: none;
  }
}