/* ═══════════════════════════════════════════
   YOUR RESTAURANT PLAYBOOK — Pre-Launch
   ═══════════════════════════════════════════ */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Fonts */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ─── LIGHT MODE ─── */
:root, [data-theme="light"] {
  --color-bg:             #faf9f6;
  --color-surface:        #ffffff;
  --color-surface-offset: #f2f0eb;
  --color-divider:        #e0ddd7;
  --color-border:         #d4d1ca;
  --color-text:           #1a1a1a;
  --color-text-muted:     #5a5a56;
  --color-text-faint:     #9a9a94;
  --color-primary:        #E1352C;
  --color-primary-hover:  #c42d25;
  --color-primary-active: #a8251e;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
}

/* ─── DARK MODE ─── */
[data-theme="dark"] {
  --color-bg:             #111110;
  --color-surface:        #1a1918;
  --color-surface-offset: #222120;
  --color-divider:        #2e2d2b;
  --color-border:         #3a3937;
  --color-text:           #e8e7e4;
  --color-text-muted:     #8a8984;
  --color-text-faint:     #5a5957;
  --color-primary:        #ef5a52;
  --color-primary-hover:  #f47870;
  --color-primary-active: #e84840;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #111110;
    --color-surface:        #1a1918;
    --color-surface-offset: #222120;
    --color-divider:        #2e2d2b;
    --color-border:         #3a3937;
    --color-text:           #e8e7e4;
    --color-text-muted:     #8a8984;
    --color-text-faint:     #5a5957;
    --color-primary:        #ef5a52;
    --color-primary-hover:  #f47870;
    --color-primary-active: #e84840;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* ═══════════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════════ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: var(--space-6);
}

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

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

/* ═══════════════════════════════════════════
   HEADER / NAV
   ═══════════════════════════════════════════ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: var(--space-4) 0;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  border-bottom-color: var(--color-divider);
  box-shadow: var(--shadow-sm);
}

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

.site-logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-logo span {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-interactive);
}

.nav-link:hover {
  color: var(--color-text);
}

/* ═══════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════ */

.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-32) var(--space-6) var(--space-16);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, color-mix(in srgb, var(--color-primary) 6%, transparent) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 860px;
}

.hero-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.hero-title em {
  font-style: italic;
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 580px;
  margin: 0 auto var(--space-8);
  line-height: 1.5;
}

.preorder-btn {
  display: inline-block;
  margin-top: var(--space-6);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition-interactive), transform var(--transition-interactive), box-shadow var(--transition-interactive);
}

.preorder-btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.preorder-btn:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.hero-bundle-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: var(--space-3);
  letter-spacing: 0.02em;
  max-width: none;
  text-align: center;
  width: 100%;
}

.hero-author {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-6px); }
}

/* ═══════════════════════════════════════════
   SECTIONS
   ═══════════════════════════════════════════ */

section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) 0;
}

.section-divider {
  width: 40px;
  height: 2px;
  background: var(--color-primary);
  margin-bottom: var(--space-8);
}

.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

/* ─── The Pitch ─── */

.pitch {
  background: var(--color-surface-offset);
}

.pitch-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}

@media (min-width: 768px) {
  .pitch-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
  }
}

.pitch-text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

.pitch-text p:last-child {
  margin-bottom: 0;
}

.pitch-text strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ─── Pull Quote ─── */

.pull-quote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
}

.pull-quote blockquote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  line-height: 1.35;
  font-style: italic;
  margin-bottom: var(--space-3);
}

.pull-quote cite {
  font-family: var(--font-body);
  font-style: normal;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ─── Five Fundamentals ─── */

.fundamentals-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

@media (min-width: 640px) {
  .fundamentals-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .fundamentals-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.fundamental-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  text-align: center;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.fundamental-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.fundamental-number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
  opacity: 0.3;
}

.fundamental-name {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.fundamental-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ─── Stats Band ─── */

.stats-band {
  background: var(--color-text);
  color: var(--color-bg);
  padding: clamp(var(--space-12), 6vw, var(--space-20)) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  text-align: center;
}

@media (min-width: 640px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}

[data-theme="dark"] .stat-number {
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--text-sm);
  opacity: 0.7;
  line-height: 1.4;
}

/* ─── Author ─── */

.author-section {
  background: var(--color-surface-offset);
}

.author-content {
  max-width: 720px;
}

.author-content p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

.author-content p:last-of-type {
  margin-bottom: 0;
}

.author-content strong {
  color: var(--color-text);
  font-weight: 600;
}

.author-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.author-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-interactive);
}

.author-link:hover {
  color: var(--color-primary);
}

.author-link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ─── Tagline / Closer ─── */

.closer {
  text-align: center;
  padding: clamp(var(--space-16), 10vw, var(--space-32)) 0;
}

.closer-tagline {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  font-style: italic;
}

.closer-cta {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ─── Footer ─── */

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
}

@media (min-width: 640px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-text {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-link {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer-link:hover {
  color: var(--color-primary);
}

/* ═══════════════════════════════════════════
   SCROLL ANIMATIONS
   ═══════════════════════════════════════════ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

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