/* ===== FoodSense 食覺 — Stylesheet ===== */

/* --- SR-Only (screen reader / crawler only) --- */
.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;
}

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

:root {
  /* Tree Ring Palette (from brand logo concentric rings) */
  --ring-core:    #193B2D;
  --ring-1:       #1E4D3A;
  --ring-2:       #2D6A4F;  /* primary */
  --ring-3:       #3E8168;
  --ring-4:       #5A9E7E;
  --ring-5:       #7DB89A;
  --ring-6:       #A3CEB5;
  --ring-7:       #C6DFD0;
  --ring-8:       #E0EDE5;
  --ring-outer:   #D5CEC4;  /* secondary */

  /* Semantic Colors */
  --color-primary:      var(--ring-2);
  --color-primary-dark:  var(--ring-1);
  --color-primary-light: var(--ring-5);
  --color-secondary:     var(--ring-outer);
  --color-accent:        #CC7A5A;
  --color-background:    #F7F5F2;
  --color-surface:       #FFFFFF;
  --color-surface-alt:   #F0EDE7;
  --color-text:          #1B1B1B;
  --color-text-muted:    #6B7280;
  --color-text-on-primary: #FFFFFF;

  /* Band Degree Colors (not good/bad) */
  --band-high:        var(--ring-2);
  --band-medium-high: var(--ring-4);
  --band-medium:      var(--ring-6);
  --band-low:         var(--ring-8);

  --color-divider: #E5E2DC;

  /* Legacy Aliases (old names → new values) */
  --forest-dark:    var(--ring-core);
  --forest-mid:     var(--ring-2);
  --forest-light:   var(--ring-5);
  --warm-stone:     var(--ring-outer);
  --cream:          var(--color-background);
  --white:          var(--color-surface);
  --text-primary:   var(--color-text);
  --text-secondary: #4A4A4A;
  --text-muted:     var(--color-text-muted);

  /* Typography */
  --font-sans: "Noto Sans TC", "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", monospace;

  /* Spacing */
  --section-padding: 120px 0;
  --container-width: 1120px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--cream);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

.section-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--forest-mid);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--forest-dark);
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
  background: rgba(247, 245, 242, 0.92);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

.nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--forest-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .logo-icon {
  width: 32px;
  height: 32px;
  display: block;
  background: var(--color-background);
  border-radius: 50%;
  padding: 2px;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--forest-dark);
}

.nav-cta {
  background: var(--forest-dark);
  color: var(--cream) !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem !important;
  transition: background 0.2s;
}

.nav-cta:hover {
  background: var(--forest-mid);
}

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--forest-dark);
  margin: 5px 0;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-mobile-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-mobile-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero Section --- */
.hero {
  padding: 180px 0 120px;
  position: relative;
  overflow: hidden;
  background: var(--cream);
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  right: -100px;
  width: 700px;
  height: 700px;
  transform: translateY(-50%);
  background: url('logo-bg.png') center / contain no-repeat;
  opacity: 0.25;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  max-width: 520px;
}

.hero-tagline {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--forest-mid);
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--forest-dark);
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 40px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  background: var(--forest-dark);
  color: var(--cream);
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.btn-primary:hover {
  background: var(--forest-mid);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 14px 24px;
  background: transparent;
  color: var(--forest-dark);
  border: 1.5px solid var(--warm-stone);
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: var(--forest-dark);
  background: rgba(25, 57, 42, 0.03);
}

.hero-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  width: 280px;
  height: 560px;
  background: var(--white);
  border-radius: 36px;
  box-shadow:
    0 24px 80px rgba(25, 57, 42, 0.12),
    0 8px 24px rgba(25, 57, 42, 0.08);
  position: relative;
  overflow: hidden;
  border: 6px solid var(--forest-dark);
}

.phone-mockup-inner {
  padding: 40px 20px 20px;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.phone-scan-bar {
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--forest-light), var(--forest-dark), var(--forest-light));
  border-radius: 2px;
  animation: scanPulse 2s ease-in-out infinite;
}

@keyframes scanPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.phone-product-card {
  background: var(--cream);
  border-radius: 12px;
  padding: 16px;
}

.phone-product-name {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--forest-dark);
}


/* v2.0 Phone Mockup: Badges & Spectrum Bars */
.phone-badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 8px;
}

.phone-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.62rem;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
}

.phone-spectrum-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.phone-spectrum {
  display: flex;
  align-items: center;
  gap: 6px;
}

.phone-spectrum-label {
  font-size: 0.58rem;
  color: var(--color-text-muted);
  min-width: 56px;
  flex-shrink: 0;
}

.phone-spectrum-track {
  flex: 1;
  height: 4px;
  background: var(--color-surface-alt);
  border-radius: 2px;
  overflow: hidden;
}

.phone-spectrum-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ring-5), var(--ring-2));
  border-radius: 2px;
  transition: width 0.6s ease;
}

/* --- Problem Section --- */
.problem {
  padding: var(--section-padding);
  background: var(--white);
}

.problem .section-title {
  max-width: 600px;
  margin-bottom: 60px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  padding: 40px 32px;
  background: var(--cream);
  border-radius: 16px;
  border: 1px solid rgba(216, 209, 198, 0.5);
  transition: transform 0.2s, box-shadow 0.2s;
}

.problem-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(25, 57, 42, 0.08);
}

.problem-number {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--forest-light);
  line-height: 1;
  margin-bottom: 20px;
}

.problem-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--forest-dark);
  margin-bottom: 16px;
}

.problem-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- How It Works Section --- */
.how-it-works {
  padding: var(--section-padding);
  background: var(--cream);
}

.how-it-works .section-title {
  max-width: 480px;
  margin-bottom: 80px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 48px;
  left: calc(33.33% / 2);
  right: calc(33.33% / 2);
  height: 2px;
  background: linear-gradient(90deg, var(--forest-light), var(--forest-dark), var(--forest-light));
  opacity: 0.3;
}

.step {
  text-align: center;
  position: relative;
}

.step-icon {
  width: 96px;
  height: 96px;
  border-radius: 24px;
  background: var(--white);
  border: 2px solid var(--forest-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
  font-size: 2.2rem;
  position: relative;
  z-index: 1;
  transition: border-color 0.3s, background 0.3s;
}

.step:hover .step-icon {
  border-color: var(--forest-dark);
  background: var(--forest-dark);
  color: var(--cream);
}

.step-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.step h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--forest-dark);
  margin-bottom: 12px;
}

.step p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 300px;
  margin: 0 auto;
}

/* --- Features Section --- */
.features {
  padding: var(--section-padding);
  background: var(--white);
}

.features .section-title {
  max-width: 560px;
  margin-bottom: 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 40px 36px;
  background: var(--cream);
  border-radius: 16px;
  border: 2px solid transparent;
  transition: border-color 0.3s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--forest-dark);
  transform: translateY(-2px);
}

.feature-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(25, 57, 42, 0.08);
  color: var(--forest-dark);
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--forest-dark);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- Scenarios Section --- */
.scenarios {
  padding: var(--section-padding);
  background: var(--cream);
}

.scenarios .section-title {
  max-width: 480px;
  margin-bottom: 60px;
}

.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.scenario {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  align-items: start;
  padding: 36px;
  background: var(--white);
  border-radius: 16px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.scenario:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(25, 57, 42, 0.06);
}

.scenario-icon {
  width: 80px;
  height: 80px;
  background: var(--cream);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
  color: var(--ring-core);
}

.scenario-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--forest-dark);
  margin-bottom: 8px;
}

.scenario-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --- Trust Section --- */
.trust {
  padding: var(--section-padding);
  background: var(--white);
}

.trust .section-title {
  max-width: 480px;
  margin-bottom: 60px;
}

.trust-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.trust-stat {
  text-align: center;
  padding: 32px 16px;
  background: var(--cream);
  border-radius: 16px;
}

.trust-stat-number {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--forest-dark);
  line-height: 1;
  margin-bottom: 8px;
}

.trust-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.trust-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 640px;
  margin-bottom: 24px;
}

.trust-powered {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.trust-powered strong {
  color: var(--forest-dark);
}

/* --- CTA Section --- */
.cta {
  padding: 100px 0;
  background: var(--forest-dark);
  color: var(--cream);
}

.cta .container {
  text-align: center;
  max-width: 600px;
}

.cta .section-title {
  color: var(--cream);
  margin-bottom: 16px;
}

.cta-description {
  font-size: 1.05rem;
  color: var(--forest-light);
  line-height: 1.8;
  margin-bottom: 40px;
}

.cta-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto 16px;
}

.cta-input {
  flex: 1;
  padding: 14px 20px;
  border: 2px solid rgba(176, 194, 174, 0.3);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--cream);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}

.cta-input::placeholder {
  color: rgba(176, 194, 174, 0.6);
}

.cta-input:focus {
  border-color: var(--forest-light);
}

.cta-submit {
  padding: 14px 28px;
  background: var(--cream);
  color: var(--forest-dark);
  border: none;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s, transform 0.2s;
}

.cta-submit:hover {
  background: var(--white);
  transform: translateY(-1px);
}

.cta-btn {
  display: inline-block;
  padding: 16px 40px;
  background: var(--cream);
  color: var(--forest-dark);
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 600;
  font-family: var(--font-sans);
  text-decoration: none;
  transition: background 0.2s, transform 0.2s;
  margin-bottom: 16px;
}

.cta-btn:hover {
  background: var(--white);
  transform: translateY(-1px);
}

.cta-note {
  font-size: 0.8rem;
  color: rgba(176, 194, 174, 0.6);
}

.cta-social {
  margin-top: 32px;
  font-size: 0.9rem;
  color: var(--forest-light);
}

.cta-social a {
  color: var(--cream);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* --- Footer --- */
.footer {
  padding: 40px 0;
  background: var(--forest-dark);
  border-top: 1px solid rgba(176, 194, 174, 0.15);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-size: 0.9rem;
  color: var(--forest-light);
}

.footer-brand strong {
  color: var(--cream);
}

.footer-brand span {
  display: block;
  font-size: 0.78rem;
  color: rgba(176, 194, 174, 0.5);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.82rem;
  color: rgba(176, 194, 174, 0.6);
  transition: color 0.2s;
}

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

.footer-copy {
  font-size: 0.78rem;
  color: rgba(176, 194, 174, 0.4);
}

/* --- 3 Badges + 6 Axes Grid --- */
.axis-preview {
  padding: var(--section-padding);
  background: var(--color-background);
}

.axis-preview .section-title {
  max-width: 560px;
  margin-bottom: 16px;
}

.axis-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.axis-card {
  padding: 20px 16px;
  background: var(--color-surface);
  border-radius: 12px;
  border-left: 4px solid var(--axis-color, var(--ring-2));
  transition: transform 0.2s, box-shadow 0.2s;
}

.axis-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(25, 57, 42, 0.08);
}

.axis-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ring-core);
  margin-bottom: 6px;
}

.axis-card p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.axis-band-preview {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--ring-8);
  color: var(--ring-2);
}

.badge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.axis-group-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ring-core);
  margin-bottom: 4px;
}

.axis-group-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --- AI Analysis Feature Section --- */
.ai-analysis {
  padding: var(--section-padding);
  background: var(--color-surface);
}

.ai-analysis .section-title {
  max-width: 560px;
  margin-bottom: 60px;
}

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

.ai-layer-card {
  padding: 36px 28px;
  background: var(--color-background);
  border-radius: 16px;
  text-align: center;
  border: 1px solid var(--color-divider);
  transition: transform 0.2s, box-shadow 0.2s;
}

.ai-layer-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(25, 57, 42, 0.08);
}

.ai-layer-card .layer-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.ai-layer-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ring-core);
  margin-bottom: 8px;
}

.ai-layer-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.layer-badge {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

.layer-badge.free {
  background: var(--ring-8);
  color: var(--ring-2);
}

.layer-badge.optional {
  background: rgba(204, 122, 90, 0.12);
  color: var(--color-accent);
}

/* --- Pricing Section --- */
.pricing {
  padding: var(--section-padding);
  background: var(--color-background);
}

.pricing .section-title {
  max-width: 480px;
  margin-bottom: 16px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 720px;
  margin: 48px auto 0;
}

.pricing-card {
  padding: 40px 32px;
  background: var(--color-surface);
  border-radius: 16px;
  border: 2px solid var(--color-divider);
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
}

.pricing-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(25, 57, 42, 0.08);
}

.pricing-card.featured {
  border-color: var(--ring-2);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--ring-2);
  color: var(--color-text-on-primary);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ring-core);
  margin-bottom: 8px;
}

.pricing-price {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--ring-core);
  margin-bottom: 24px;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--color-divider);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li strong {
  color: var(--ring-core);
}

.pricing-btn {
  width: 100%;
  text-align: center;
  justify-content: center;
}

/* --- Brand Philosophy Section --- */
.philosophy {
  padding: 80px 0;
  background: var(--ring-core);
  text-align: center;
}

.philosophy-quote {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 500;
  color: var(--ring-5);
  line-height: 1.6;
  max-width: 640px;
  margin: 0 auto 16px;
  border: none;
}

.philosophy-source {
  font-size: 0.85rem;
  color: var(--ring-6);
  margin-bottom: 24px;
}

.philosophy-meaning {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-background);
  max-width: 480px;
  margin: 0 auto;
}

/* --- Skip Link (accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 8px 16px;
  background: var(--ring-core);
  color: var(--color-background);
  border-radius: 0 0 8px 8px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 200;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* --- Focus Styles (accessibility) --- */
*:focus-visible {
  outline: 2px solid var(--ring-4);
  outline-offset: 2px;
}

/* --- Form Error State --- */
.cta-input.input-error {
  border-color: var(--color-accent);
}

/* --- Responsive --- */
@media (max-width: 960px) {
  :root {
    --section-padding: 80px 0;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
  }

  .phone-mockup {
    width: 220px;
    height: 440px;
  }

  .problem-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .steps::before {
    display: none;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .trust-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .axis-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .badge-grid {
    grid-template-columns: 1fr;
  }

  .ai-layers {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .scenario {
    grid-template-columns: 64px 1fr;
    gap: 20px;
    padding: 24px;
  }

  .scenario-icon {
    width: 64px;
    height: 64px;
  }

  .cta-form {
    flex-direction: column;
  }

  .footer .container {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .nav-mobile-toggle {
    display: block;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--cream);
    padding: 24px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border-radius: 0 0 16px 16px;
    gap: 16px;
  }

  .hero {
    padding: 140px 0 80px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .axis-grid {
    grid-template-columns: 1fr;
  }
}