/* =========================================================
   Critical Management Methods — Design System
   Structural Minimalism · Industrial Precision · Sharp corners
   ========================================================= */

:root {
  /* Surfaces */
  --surface: #f8f9fa;
  --surface-dim: #d9dadb;
  --surface-container: #edeeef;
  --surface-container-low: #f3f4f5;
  --surface-container-high: #e7e8e9;
  --surface-variant: #e1e3e4;
  --surface-white: #ffffff;

  /* Ink */
  --on-surface: #191c1d;
  --on-surface-variant: #4c4546;
  --on-primary-container: #848484;
  --inverse-on-surface: #f0f1f2;

  /* Brand */
  --primary: #000000;
  --on-primary: #ffffff;
  --primary-container: #1b1b1b;
  --secondary-fixed: #ffe24c;       /* Action Yellow */
  --secondary-fixed-dim: #e2c62d;
  --on-tertiary-container: #ef4444; /* Warning Red */
  --outline: #7e7576;
  --outline-variant: #cfc4c5;

  /* Spacing (8pt scale) */
  --xs: 4px;
  --base: 8px;
  --sm: 12px;
  --md: 24px;
  --lg: 48px;
  --xl: 80px;
  --gutter: 24px;
  --margin: 32px;

  /* Type */
  --font-display: 'Montserrat', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Layout */
  --container-max: 1280px;
  --header-h: 80px;
}

/* ---------------------------------- Reset / base */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--on-surface);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--header-h);
}

img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; margin: 0; }

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

/* ---------------------------------- Typography utilities */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(40px, 6.5vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0;
}
.headline-lg {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0;
  text-transform: uppercase;
}
.headline-md {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
}
.body-lg { font-size: 18px; line-height: 1.6; margin: 0; }
.body-md { font-size: 16px; line-height: 1.5; margin: 0; }
.label-bold {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.muted { color: var(--on-surface-variant); }
.inverse-muted { color: var(--surface-variant); }
.italic { font-style: italic; }
.accent-text { color: var(--secondary-fixed); }
.leading-none { line-height: 1; }

.underlined {
  text-decoration: underline;
  text-decoration-color: var(--secondary-fixed);
  text-decoration-thickness: 8px;
  text-underline-offset: 8px;
}

/* ---------------------------------- Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--base);
  padding: var(--base) var(--md);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 2px solid var(--primary);
  background: transparent;
  color: var(--primary);
  transition: background-color 200ms ease, color 200ms ease, transform 120ms ease;
}
.btn:hover { background: var(--primary); color: var(--on-primary); }
.btn:active { transform: translate(2px, 2px); }

.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--secondary-fixed); color: var(--primary); }

.btn-secondary { background: transparent; color: var(--primary); }
.btn-secondary:hover { background: var(--primary-container); color: var(--on-primary); }

.btn-critical { background: var(--secondary-fixed); color: var(--primary); }
.btn-critical:hover { background: var(--primary); color: var(--on-primary); }

.btn-lg { padding: var(--md) var(--lg); font-size: 16px; }
.btn-full { width: 100%; }

.hard-shadow { box-shadow: 4px 4px 0 0 rgba(0, 0, 0, 1); }

/* ---------------------------------- Header */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 2px solid var(--primary);
  z-index: 50;
}
.header-inner {
  max-width: var(--container-max);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--margin);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--md);
}
.brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--primary);
}
.primary-nav {
  display: flex;
  gap: var(--md);
  align-items: center;
}
.nav-link {
  font-size: 16px;
  color: var(--on-surface-variant);
  transition: color 200ms ease;
  padding-bottom: 4px;
}
.nav-link:hover { color: var(--primary); }
.nav-link.is-active {
  color: var(--primary);
  font-weight: 700;
  border-bottom: 4px solid var(--secondary-fixed);
}
.menu-toggle {
  display: none;
  border: 2px solid var(--primary);
  background: var(--surface);
  padding: var(--xs);
  color: var(--primary);
}

/* ---------------------------------- Hero */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding-block: var(--xl);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--xl);
  align-items: center;
}
.hero-copy { display: flex; flex-direction: column; gap: var(--md); }
.eyebrow {
  align-self: flex-start;
  background: var(--secondary-fixed);
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: var(--xs) var(--sm);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--base);
  padding-top: var(--md);
}
.hero-cover { position: relative; }
.cover-offset {
  position: absolute;
  inset: -16px;
  background: var(--secondary-fixed);
  transform: translate(16px, 16px);
  z-index: 0;
}
.cover-img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  border: 2px solid var(--primary);
  background: #fff;
}
.cover-img.is-3d {
  border: none;
  background: transparent;
}
.hero-cover:has(.is-3d) .cover-offset {
  inset: 8% 6% 4% 10%;
  transform: translate(20px, 24px);
}

/* ---------------------------------- Buy / Bento */
.buy-section {
  background: var(--surface-container);
  padding-block: var(--xl);
}
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--md);
}
.bento-card {
  border: 2px solid var(--primary);
  padding: var(--md);
  display: flex;
  flex-direction: column;
  gap: var(--base);
}
.card-white { background: var(--surface-white); }
.card-black { background: var(--primary); color: var(--on-primary); }
.bento-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.section-divider {
  border-bottom: 2px solid var(--primary);
  padding-bottom: var(--xs);
  margin-bottom: var(--md);
}
.methods-list { display: flex; flex-direction: column; gap: var(--sm); }
.methods-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--xs);
  font-size: 16px;
}
.check-icon {
  color: var(--secondary-fixed);
  background: var(--primary);
  font-size: 20px;
  padding: 2px;
}
.bento-cover {
  width: 100%;
  max-height: 220px;
  object-fit: cover;
  object-position: center top;
  border: 2px solid var(--secondary-fixed);
  margin-block: var(--xs);
}

/* ---------------------------------- Inside the Book */
.inside-section {
  background: var(--surface-white);
  padding-block: var(--xl);
  border-top: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
}
.section-heading-left {
  text-align: left;
  align-items: flex-start;
  margin-bottom: var(--lg);
}
.eyebrow-dark {
  background: var(--primary);
  color: var(--secondary-fixed);
}
.inside-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--xl);
  align-items: start;
}
.inside-copy { display: flex; flex-direction: column; gap: var(--md); }
.promise-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: promise;
  border: 2px solid var(--primary);
  background: var(--surface-container-low);
}
.promise-list li {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--md);
  align-items: start;
  padding: var(--md);
  border-bottom: 2px solid var(--primary);
}
.promise-list li:last-child { border-bottom: none; }
.promise-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--primary);
  background: var(--secondary-fixed);
  border: 2px solid var(--primary);
  width: 64px;
  height: 64px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.promise-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 var(--xs) 0;
}
.pullquote {
  margin: var(--xl) 0 0;
  padding: var(--md) var(--lg);
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 600;
  line-height: 1.3;
  border-left: 8px solid var(--secondary-fixed);
  background: var(--surface-container-low);
}

/* ---------------------------------- Author */
.author-section {
  background: var(--surface-white);
  padding-block: var(--xl);
}
.author-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--xl);
  align-items: center;
}
.author-photo-wrap { position: relative; }
.photo-offset {
  position: absolute;
  inset: 0;
  background: var(--primary);
  transform: translate(12px, 12px);
}
.photo-frame {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--surface-dim);
  border: 2px solid var(--primary);
  overflow: hidden;
}
.author-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.25);
}
.author-copy { display: flex; flex-direction: column; gap: var(--md); }
.stat-row {
  display: flex;
  gap: var(--md);
  padding-top: var(--base);
}
.stat {
  border-left: 4px solid var(--primary);
  padding-left: var(--md);
}

/* ---------------------------------- Videos / Shorts */
.videos-section {
  background: var(--surface);
  padding-block: var(--xl);
  border-bottom: 2px solid var(--primary);
}
.videos-intro {
  max-width: 640px;
  margin-top: var(--sm);
}
.shorts-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--md);
}
.short-card {
  display: flex;
  flex-direction: column;
  border: 2px solid var(--primary);
  background: var(--surface-white);
  transition: transform 150ms ease;
}
.short-card:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 0 rgba(0,0,0,1); }
.short-thumb {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 9 / 16;
  background:
    linear-gradient(135deg, rgba(255, 226, 76, 0.18) 0%, transparent 60%),
    repeating-linear-gradient(
      45deg,
      var(--primary) 0,
      var(--primary) 2px,
      var(--primary-container) 2px,
      var(--primary-container) 12px
    );
  border: none;
  border-bottom: 2px solid var(--primary);
  color: var(--on-primary);
  cursor: pointer;
  overflow: hidden;
}
.short-thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.6) 100%);
}
.short-tag {
  position: absolute;
  top: var(--sm);
  left: var(--sm);
  background: var(--secondary-fixed);
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 2px var(--xs);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  z-index: 2;
}
.short-thumb .play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 56px;
  background: var(--secondary-fixed);
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 8px;
  z-index: 2;
  transition: background-color 150ms ease, color 150ms ease;
}
.short-thumb:hover .play-icon { background: var(--primary); color: var(--secondary-fixed); }
.short-card iframe {
  width: 100%;
  aspect-ratio: 9 / 16;
  border: none;
  border-bottom: 2px solid var(--primary);
  display: block;
  background: #000;
}
.short-meta {
  padding: var(--sm) var(--md) var(--md);
  display: flex;
  flex-direction: column;
  gap: var(--xs);
}
.short-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
  margin: 0;
}
.videos-cta {
  margin-top: var(--lg);
  display: flex;
  justify-content: center;
}

/* ---------------------------------- Community */
.community-section {
  background: var(--primary);
  color: var(--on-primary);
  padding-block: var(--xl);
}
.community-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--xl);
  align-items: center;
}
.community-copy { display: flex; flex-direction: column; gap: var(--md); max-width: 36rem; }
.community-form {
  background: var(--surface-white);
  color: var(--on-surface);
  border: 2px solid var(--primary);
  padding: var(--lg);
  display: flex;
  flex-direction: column;
  gap: var(--md);
}
.field { display: flex; flex-direction: column; gap: var(--xs); }
.field input,
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: var(--base);
  border: 2px solid var(--primary);
  background: var(--surface-white);
  color: var(--on-surface);
  font-family: var(--font-body);
  font-size: 16px;
  outline: none;
  transition: border-color 150ms ease, background-color 150ms ease;
}
.field input:focus,
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--secondary-fixed-dim);
  background: #fffbea;
}
.fine-print {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-align: center;
  color: var(--on-primary-container);
  margin: 0;
}

/* ---------------------------------- Contact */
.contact-section {
  background: var(--surface);
  padding-block: var(--xl);
}
.section-heading {
  text-align: center;
  margin-bottom: var(--xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--base);
}
.rule {
  width: 96px;
  height: 8px;
  background: var(--primary);
}
.contact-form {
  max-width: 768px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--md);
}
.contact-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--base);
}
.contact-form input,
.contact-form textarea {
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 14px;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--outline-variant);
}
.contact-actions { display: flex; justify-content: flex-end; }

/* ---------------------------------- Footer */
.site-footer {
  background: var(--primary);
  color: var(--on-primary);
}
.footer-inner {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--xl);
  border-top: 2px solid var(--primary);
  gap: var(--md);
}
.footer-brand { display: flex; flex-direction: column; gap: var(--sm); max-width: 22rem; }
.footer-meta { display: flex; flex-direction: column; align-items: flex-end; gap: var(--md); }
.footer-nav {
  display: flex;
  gap: var(--md);
  flex-wrap: wrap;
  justify-content: flex-end;
}
.footer-nav a {
  color: var(--surface-variant);
  font-size: 16px;
  transition: color 200ms ease;
}
.footer-nav a:hover { color: var(--secondary-fixed); }
.copyright {
  color: var(--surface-variant);
  opacity: 0.6;
  font-size: 16px;
  text-align: right;
}

/* ---------------------------------- Cart FAB */
.cart-fab {
  position: fixed;
  bottom: var(--margin);
  right: var(--margin);
  background: var(--secondary-fixed);
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: var(--md);
  z-index: 100;
  transition: background-color 200ms ease, color 200ms ease, transform 120ms ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.cart-fab:hover { background: var(--primary); color: var(--on-primary); }
.cart-fab:active { transform: translate(2px, 2px); }

/* ---------------------------------- Toast */
.toast {
  position: fixed;
  bottom: calc(var(--margin) + 80px);
  right: var(--margin);
  background: var(--primary);
  color: var(--on-primary);
  border: 2px solid var(--primary);
  padding: var(--sm) var(--md);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  z-index: 200;
  transform: translateY(20px);
  opacity: 0;
  transition: opacity 200ms ease, transform 200ms ease;
  pointer-events: none;
}
.toast.is-visible { opacity: 1; transform: translateY(0); }
.toast.is-error { background: var(--on-tertiary-container); }

/* ---------------------------------- Responsive */
@media (max-width: 960px) {
  .hero-grid,
  .author-grid,
  .community-grid,
  .inside-grid {
    grid-template-columns: 1fr;
    gap: var(--lg);
  }
  .author-photo-wrap { max-width: 360px; }
  .footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .footer-meta { align-items: center; }
  .footer-nav { justify-content: center; }
  .copyright { text-align: center; }
}

@media (max-width: 720px) {
  :root { --margin: 20px; --xl: 56px; --lg: 36px; }
  .primary-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 2px solid var(--primary);
    flex-direction: column;
    gap: 0;
    padding: var(--md);
  }
  .primary-nav.is-open { display: flex; }
  .primary-nav .nav-link {
    padding: var(--sm) 0;
    border-bottom: 1px solid var(--outline-variant);
  }
  .primary-nav .nav-link:last-child { border-bottom: none; }
  .menu-toggle { display: inline-flex; }
  .hide-xs { display: none; }
  .bento-grid { grid-template-columns: 1fr; }
  .contact-row { grid-template-columns: 1fr; }
  .promise-list li { grid-template-columns: 56px 1fr; gap: var(--sm); }
  .promise-num { width: 48px; height: 48px; font-size: 22px; }
  .shorts-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 480px) {
  .shorts-grid { grid-template-columns: 1fr; }
}