/* Art direction: AI Red Team Academy → Terminal-hacker refined, elite security briefing
   Palette: Dark green-tinted surfaces, terminal green accent (#00ff88), softer teal (#00d4aa)
   Typography: Clash Display (geometric, commanding) + Satoshi (clean, modern) + JetBrains Mono (code)
   Density: Spacious — educational/editorial */

/* ============================================
   DESIGN TOKENS
   ============================================ */

:root {
  /* Font Families */
  --font-display: 'Clash Display', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Fluid 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);

  /* 4px Spacing System */
  --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;

  /* 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;
  --content-full: 100%;
}

/* ============================================
   LIGHT MODE
   ============================================ */
:root, [data-theme="light"] {
  --color-bg:             #f0f4f2;
  --color-surface:        #f5f8f6;
  --color-surface-2:      #fafcfb;
  --color-surface-offset: #e8ece9;
  --color-surface-offset-2: #dfe4e1;
  --color-surface-dynamic: #d5dbd8;
  --color-divider:        #c8d0cc;
  --color-border:         #b8c2bc;

  --color-text:           #0a1a12;
  --color-text-muted:     #4a6055;
  --color-text-faint:     #8a9c92;
  --color-text-inverse:   #f0f4f2;

  --color-primary:        #00875a;
  --color-primary-hover:  #006b47;
  --color-primary-active: #005038;
  --color-primary-highlight: #d0e8dd;

  --color-secondary:      #009980;
  --color-secondary-hover: #007a66;

  --color-warning:        #964219;
  --color-warning-hover:  #713417;
  --color-warning-highlight: #ddcfc6;

  --color-error:          #c93030;
  --color-error-hover:    #a82020;
  --color-error-highlight: #f0d0d0;

  --color-success:        #00875a;
  --color-success-highlight: #d0e8dd;

  --shadow-sm: 0 1px 2px oklch(0.15 0.02 160 / 0.08);
  --shadow-md: 0 4px 12px oklch(0.15 0.02 160 / 0.1);
  --shadow-lg: 0 12px 32px oklch(0.15 0.02 160 / 0.14);
}

/* ============================================
   DARK MODE (DEFAULT)
   ============================================ */
[data-theme="dark"] {
  --color-bg:             #0a0f0d;
  --color-surface:        #0d1310;
  --color-surface-2:      #111916;
  --color-surface-offset: #151d19;
  --color-surface-offset-2: #1a2420;
  --color-surface-dynamic: #212e28;
  --color-divider:        #283830;
  --color-border:         #334840;

  --color-text:           #e0e8e4;
  --color-text-muted:     #7a8a82;
  --color-text-faint:     #4a5a52;
  --color-text-inverse:   #0a0f0d;

  --color-primary:        #00ff88;
  --color-primary-hover:  #00e07a;
  --color-primary-active: #00c06a;
  --color-primary-highlight: #0a2a18;

  --color-secondary:      #00d4aa;
  --color-secondary-hover: #00b892;

  --color-warning:        #f0a040;
  --color-warning-hover:  #d08830;
  --color-warning-highlight: #2a2010;

  --color-error:          #ff5555;
  --color-error-hover:    #e04040;
  --color-error-highlight: #2a1010;

  --color-success:        #00ff88;
  --color-success-highlight: #0a2a18;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0a0f0d;
    --color-surface: #0d1310;
    --color-surface-2: #111916;
    --color-surface-offset: #151d19;
    --color-surface-offset-2: #1a2420;
    --color-surface-dynamic: #212e28;
    --color-divider: #283830;
    --color-border: #334840;
    --color-text: #e0e8e4;
    --color-text-muted: #7a8a82;
    --color-text-faint: #4a5a52;
    --color-text-inverse: #0a0f0d;
    --color-primary: #00ff88;
    --color-primary-hover: #00e07a;
    --color-primary-active: #00c06a;
    --color-primary-highlight: #0a2a18;
    --color-secondary: #00d4aa;
    --color-secondary-hover: #00b892;
    --color-warning: #f0a040;
    --color-error: #ff5555;
    --color-success: #00ff88;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.4);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
  }
}

/* ============================================
   GLOBAL TYPOGRAPHY
   ============================================ */

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
a:hover {
  color: var(--color-primary);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

.section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-24));
}

/* ============================================
   HEADER
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid oklch(from var(--color-border) l c h / 0.3);
  transition: box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.header__logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header__nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
  text-decoration: none;
  white-space: nowrap;
}

.header__nav a:hover,
.header__nav a.active {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
  display: flex;
  align-items: center;
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    flex-direction: column;
    gap: var(--space-1);
    box-shadow: var(--shadow-lg);
  }
  .header__nav.open {
    display: flex;
  }
  .header__nav a {
    width: 100%;
    padding: var(--space-3) var(--space-4);
  }
  .mobile-menu-btn {
    display: flex;
    align-items: center;
  }
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 80%, oklch(from var(--color-primary) l c h / 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 20%, oklch(from var(--color-secondary) l c h / 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(oklch(from var(--color-primary) l c h / 0.04) 1px, transparent 1px),
    linear-gradient(90deg, oklch(from var(--color-primary) l c h / 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.hero__text {
  max-width: 640px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  margin-bottom: var(--space-6);
  letter-spacing: 0.02em;
}

.hero__badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-4);
}

.hero__title span {
  display: block;
}

.hero__subtitle {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.hero__description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 540px;
}

.hero__ctas {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hero__terminal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero__terminal-bar {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.hero__terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}
.hero__terminal-dot--red { background: #ff5f57; }
.hero__terminal-dot--yellow { background: #febc2e; }
.hero__terminal-dot--green { background: #28c840; }

.hero__terminal-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-left: var(--space-2);
}

.hero__terminal-body {
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
  min-height: 280px;
}

.terminal-line {
  margin-bottom: var(--space-1);
  opacity: 0;
  animation: terminal-appear 0.3s ease forwards;
}

.terminal-prompt {
  color: var(--color-primary);
}

.terminal-cmd {
  color: var(--color-text);
}

.terminal-comment {
  color: var(--color-text-faint);
}

.terminal-output {
  color: var(--color-text-muted);
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 1.2em;
  background: var(--color-primary);
  vertical-align: text-bottom;
  animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

@keyframes terminal-appear {
  to { opacity: 1; }
}

@media (max-width: 900px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .hero__terminal {
    max-width: 520px;
  }
  .hero {
    min-height: auto;
  }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive),
              border-color var(--transition-interactive);
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}

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

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

.btn--secondary {
  background: var(--color-surface-offset);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-secondary);
}

.btn--ghost:hover {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

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

/* ============================================
   STATS BAR
   ============================================ */

.stats {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-6) var(--space-4);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  text-align: center;
}

.stats__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stats__number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.stats__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

@media (max-width: 600px) {
  .stats__inner {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }
}

/* ============================================
   COURSE OVERVIEW
   ============================================ */

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

.overview__card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.overview__card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.overview__card ul {
  list-style: none;
  padding: 0;
}

.overview__card li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  padding-left: var(--space-5);
  position: relative;
}

.overview__card li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 600;
}

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

/* ============================================
   SECTION HEADERS
   ============================================ */

.section-header {
  margin-bottom: var(--space-8);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}

.section-description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 640px;
  line-height: 1.7;
}

/* ============================================
   MODULE CARDS
   ============================================ */

.modules__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.module-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-interactive);
}

.module-card.is-open {
  border-color: oklch(from var(--color-primary) l c h / 0.3);
}

.module-card__header {
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  transition: background var(--transition-interactive);
  width: 100%;
  text-align: left;
  color: var(--color-text);
}

.module-card__header:hover {
  background: var(--color-surface-offset);
}

.module-card__number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  min-width: 56px;
  text-align: center;
  flex-shrink: 0;
  margin-top: var(--space-1);
}

.module-card__info {
  flex: 1;
  min-width: 0;
}

.module-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.module-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.module-card__read-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
  transition: background var(--transition-interactive), color var(--transition-interactive), transform var(--transition-interactive);
}

.module-card__read-link:hover {
  background: oklch(from var(--color-primary) l c h / 0.15);
  color: var(--color-primary);
  transform: translateX(2px);
}

.module-card__read-link svg {
  flex-shrink: 0;
}

.module-card__toggle {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-faint);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), color var(--transition-interactive);
  margin-top: var(--space-1);
}

.module-card.is-open .module-card__toggle {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.module-card__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.module-card.is-open .module-card__body {
  max-height: 3000px;
  transition: max-height 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.module-card__content {
  padding: 0 var(--space-6) var(--space-6);
  border-top: 1px solid var(--color-divider);
}

.module-card__content-inner {
  padding-top: var(--space-6);
}

/* Module Topics */
.module-topics {
  margin-bottom: var(--space-6);
}

.module-topics h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  letter-spacing: -0.01em;
}

.module-topics h4 svg {
  color: var(--color-primary);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.topics-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
}

.topics-list li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  padding-left: var(--space-5);
  position: relative;
  border-radius: var(--radius-sm);
  transition: background var(--transition-interactive);
  line-height: 1.5;
}

.topics-list li::before {
  content: '';
  position: absolute;
  left: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  opacity: 0.6;
}

@media (min-width: 768px) {
  .topics-list {
    grid-template-columns: 1fr 1fr;
  }
}

/* Module Lab */
.module-lab {
  background: var(--color-surface-offset);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-6);
}

.module-lab__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.module-lab__icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.module-lab h4 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.module-lab__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.module-lab__objectives {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.module-lab__objectives li {
  font-size: var(--text-sm);
  color: var(--color-text);
  padding-left: var(--space-6);
  position: relative;
  line-height: 1.5;
}

.module-lab__objectives li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
}

/* Module References */
.module-refs {
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-4);
}

.module-refs h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.module-refs h4 svg {
  color: var(--color-secondary);
  width: 16px;
  height: 16px;
}

.refs-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
}

.refs-list li a {
  font-size: var(--text-xs);
  color: var(--color-secondary);
  padding: var(--space-1) var(--space-3);
  background: oklch(from var(--color-secondary) l c h / 0.08);
  border-radius: var(--radius-full);
  transition: background var(--transition-interactive), color var(--transition-interactive);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.refs-list li a:hover {
  background: oklch(from var(--color-secondary) l c h / 0.15);
  color: var(--color-primary);
}

.refs-list li a svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

/* ============================================
   TOOLS & RESOURCES
   ============================================ */

.tools__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.tool-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.tool-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.tool-card__org {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-top: calc(var(--space-1) * -1);
}

.tool-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}

.tool-card__links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.tool-card__links a {
  font-size: var(--text-xs);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.tool-card__links a svg {
  width: 14px;
  height: 14px;
}

.frameworks__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-3);
}

.framework-card {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.framework-card:hover {
  border-color: var(--color-secondary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  color: var(--color-text);
}

.framework-card:active {
  transform: translateY(0);
}

.framework-card__name {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
}

.framework-card__url {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

.framework-card svg {
  color: var(--color-secondary);
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

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

/* ============================================
   QUICK START / CODE BLOCK
   ============================================ */

.code-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-block__bar {
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.code-block__dots {
  display: flex;
  gap: var(--space-2);
}

.code-block__dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}
.code-block__dot--red { background: #ff5f57; }
.code-block__dot--yellow { background: #febc2e; }
.code-block__dot--green { background: #28c840; }

.code-block__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.code-block__body {
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
  overflow-x: auto;
}

.code-block__body pre {
  margin: 0;
  white-space: pre;
}

.code-comment { color: var(--color-text-faint); }
.code-keyword { color: var(--color-primary); }
.code-string { color: var(--color-secondary); }
.code-url { color: var(--color-text-muted); }

/* ============================================
   ABOUT SECTION
   ============================================ */

.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

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

.about__text p strong {
  color: var(--color-text);
}

.about__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.about-link {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}

.about-link:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.about-link svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.about-link__text {
  flex: 1;
}

.about-link__title {
  font-size: var(--text-sm);
  font-weight: 600;
}

.about-link__desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

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

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.footer__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer__brand-text {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.footer__links {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__links a:hover {
  color: var(--color-primary);
}

.footer__bottom {
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

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

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

.footer__attribution a:hover {
  color: var(--color-primary);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

.reveal-up {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .reveal-up {
    clip-path: inset(30% 0 0 0);
    opacity: 0;
    animation: reveal-clip linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes reveal-clip {
  to { clip-path: inset(0 0 0 0); opacity: 1; }
}

/* ============================================
   UTILITIES
   ============================================ */

.text-primary { color: var(--color-primary); }
.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.font-mono { font-family: var(--font-mono); }
.font-display { font-family: var(--font-display); }

/* Skip to content */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  z-index: 200;
  transition: top var(--transition-interactive);
}

.skip-link:focus {
  top: var(--space-4);
  color: var(--color-text-inverse);
}