/* ============================================================
   Tech Excuse Generator — Styles
   Palette: Dark terminal-green on near-black, with beige light mode
   Fonts: Cabinet Grotesk (display) + JetBrains Mono (body/tech)
   ============================================================ */

/* ── Design Tokens ────────────────────────────────────────── */
:root,
[data-theme='light'] {
  --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);

  --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;

  /* Light palette — warm off-white */
  --color-bg:               #f5f4ef;
  --color-surface:          #f9f8f4;
  --color-surface-2:        #fdfcfa;
  --color-surface-offset:   #eceae3;
  --color-border:           #d8d5cd;
  --color-divider:          #e0ddd6;
  --color-text:             #1a1a16;
  --color-text-muted:       #6b6a63;
  --color-text-faint:       #b4b3ad;
  --color-text-inverse:     #f5f4ef;

  /* Green accent (terminal-inspired) */
  --color-primary:           #1d7a4a;
  --color-primary-hover:     #155c37;
  --color-primary-active:    #0e3f26;
  --color-primary-highlight: #c8e8d8;

  --color-gold:    #b08800;
  --color-warning: #a04a18;
  --color-error:   #a0294a;
  --color-success: #1d7a4a;

  --radius-sm:   0.375rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1.25rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm:  0 1px 3px oklch(0.15 0.01 140 / 0.07);
  --shadow-md:  0 4px 16px oklch(0.15 0.01 140 / 0.10);
  --shadow-lg:  0 12px 40px oklch(0.15 0.01 140 / 0.14);

  --content-default: 960px;
  --content-narrow:  640px;

  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body:    'JetBrains Mono', 'Courier New', monospace;
}

[data-theme='dark'] {
  --color-bg:               #0e0f0b;
  --color-surface:          #131410;
  --color-surface-2:        #181916;
  --color-surface-offset:   #111210;
  --color-border:           #2a2c26;
  --color-divider:          #1f211c;
  --color-text:             #d4d6cc;
  --color-text-muted:       #6e7067;
  --color-text-faint:       #3e4038;
  --color-text-inverse:     #0e0f0b;

  --color-primary:           #39c77a;
  --color-primary-hover:     #2fb36a;
  --color-primary-active:    #22964f;
  --color-primary-highlight: #1a3326;

  --color-gold:    #e6b800;
  --color-warning: #e07840;
  --color-error:   #e05075;
  --color-success: #39c77a;

  --shadow-sm:  0 1px 3px oklch(0 0 0 / 0.25);
  --shadow-md:  0 4px 16px oklch(0 0 0 / 0.35);
  --shadow-lg:  0 12px 40px oklch(0 0 0 / 0.50);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:               #0e0f0b;
    --color-surface:          #131410;
    --color-surface-2:        #181916;
    --color-surface-offset:   #111210;
    --color-border:           #2a2c26;
    --color-divider:          #1f211c;
    --color-text:             #d4d6cc;
    --color-text-muted:       #6e7067;
    --color-text-faint:       #3e4038;
    --color-text-inverse:     #0e0f0b;
    --color-primary:          #39c77a;
    --color-primary-hover:    #2fb36a;
    --color-primary-active:   #22964f;
    --color-primary-highlight:#1a3326;
    --color-gold:             #e6b800;
    --color-warning:          #e07840;
    --color-error:            #e05075;
    --color-success:          #39c77a;
  }
}

/* ── Base Reset ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
h1,h2,h3,h4 { font-family: var(--font-display); text-wrap: balance; line-height: 1.1; }
p, li { text-wrap: pretty; }
a, button, input, select { transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
::selection { background: color-mix(in oklab, var(--color-primary) 20%, transparent); }

/* ── Header ───────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
}
.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.logo-accent { color: var(--color-primary); }
.header-actions { display: flex; gap: var(--space-2); }
.btn-ghost {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}
.btn-ghost:hover { background: var(--color-surface-offset); color: var(--color-text); }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6) var(--space-16);
}
.hero-inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-6);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
}
.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* Title */
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--color-text);
  line-height: 1.0;
}
.hero-accent { color: var(--color-primary); }
.hero-subtitle {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 50ch;
  line-height: 1.7;
}

/* Category Filter */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}
.cat-btn {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-family: var(--font-body);
  font-weight: 500;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: var(--color-surface);
  white-space: nowrap;
}
.cat-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.cat-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

/* CTA Zone */
.cta-zone {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}
.btn-generate {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow: var(--shadow-md), 0 0 0 0 color-mix(in oklab, var(--color-primary) 40%, transparent);
}
.btn-generate:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg), 0 0 20px color-mix(in oklab, var(--color-primary) 25%, transparent);
}
.btn-generate:active { transform: translateY(0); }
.btn-icon { flex-shrink: 0; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  background: var(--color-surface);
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

/* Excuse Card */
.excuse-card {
  width: 100%;
  min-height: 120px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-align: left;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.excuse-card.has-excuse {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md), 0 0 0 1px color-mix(in oklab, var(--color-primary) 15%, transparent);
}
.excuse-card-inner { flex: 1; }

/* Placeholder state */
.excuse-placeholder {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
  padding: var(--space-4) 0;
}
.terminal-cursor {
  font-weight: 700;
  color: var(--color-primary);
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* Revealed excuse */
.excuse-category-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}
.excuse-text {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.7;
  border: none;
  padding: 0;
  font-style: normal;
}
.excuse-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.excuse-tag {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  background: var(--color-surface-offset);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}
.excuse-card-inner {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 240ms ease, transform 240ms ease;
}
.excuse-card-inner.excuse-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Excuse Actions */
.excuse-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-4);
}
.action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  font-family: var(--font-body);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: var(--color-surface);
  white-space: nowrap;
}
.action-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.action-btn.copied { border-color: var(--color-success); color: var(--color-success); }
.action-btn-danger:hover { border-color: var(--color-warning); color: var(--color-warning); }

/* Severity */
.severity-zone {
  width: 100%;
  flex-direction: column;
  gap: var(--space-2);
  opacity: 0;
  animation: fadeIn 300ms ease forwards;
}
.severity-zone[style*="flex"] { display: flex !important; }
@keyframes fadeIn { to { opacity: 1; } }
.severity-label { font-size: var(--text-xs); color: var(--color-text-muted); }
.severity-bar {
  width: 100%;
  height: 4px;
  background: var(--color-surface-offset);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.severity-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 500ms cubic-bezier(0.16, 1, 0.3, 1), background 300ms ease;
}
.severity-text { font-size: var(--text-xs); font-weight: 600; }

/* ── Stats Section ────────────────────────────────────────── */
.stats-section {
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding: var(--space-8) var(--space-6);
}
.stats-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}
.stat-item { text-align: center; }
.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-1);
}
.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--color-divider);
}

/* ── Showcase Section ─────────────────────────────────────── */
.showcase-section {
  padding: clamp(var(--space-12), 8vw, var(--space-20)) var(--space-6);
}
.showcase-inner { max-width: var(--content-default); margin: 0 auto; }
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-8);
  color: var(--color-text);
}
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}
.showcase-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.showcase-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.showcase-card-cta {
  cursor: pointer;
  background: var(--color-primary-highlight);
  border-color: color-mix(in oklab, var(--color-primary) 30%, transparent);
}
.showcase-card-cta:hover { background: color-mix(in oklab, var(--color-primary-highlight) 80%, var(--color-primary)); }
.showcase-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
}
.showcase-icon-accent { background: color-mix(in oklab, var(--color-primary) 15%, transparent); color: var(--color-primary); }
.showcase-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
}
.showcase-card p {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 36ch;
}

/* ── History Panel ────────────────────────────────────────── */
.history-overlay {
  position: fixed;
  inset: 0;
  background: oklch(0 0 0 / 0.4);
  z-index: 98;
  opacity: 0;
  pointer-events: none;
  transition: opacity 240ms ease;
}
.history-overlay.open { opacity: 1; pointer-events: all; }

.history-panel {
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  width: min(380px, 90vw);
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  z-index: 99;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-lg);
}
.history-panel.open { transform: translateX(0); }

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}
.history-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
}
.history-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.history-empty {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
  padding: var(--space-8) 0;
  line-height: 1.8;
}
.history-item {
  padding: var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.history-cat {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.history-text {
  font-size: var(--text-xs);
  color: var(--color-text);
  line-height: 1.6;
}
.history-time {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.btn-clear-history {
  margin: var(--space-4) var(--space-6) var(--space-6);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: transparent;
}
.btn-clear-history:hover { border-color: var(--color-error); color: var(--color-error); }

/* ── Disclaimer ───────────────────────────────────────────── */
.disclaimer-section {
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.disclaimer-inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  text-align: center;
}
.disclaimer-text {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.7;
  max-width: 58ch;
  margin: 0 auto;
}

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-6);
}
.footer-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  text-align: center;
}
.footer-inner p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: unset;
}
.footer-hint { color: var(--color-text-muted); }

/* ── Terminal scan-line effect (dark mode only) ──────────── */
[data-theme='dark'] .hero {
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    oklch(0 0 0 / 0.02) 2px,
    oklch(0 0 0 / 0.02) 4px
  );
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  .header-inner { padding: var(--space-3) var(--space-4); }
  .hero { padding: var(--space-10) var(--space-4) var(--space-12); }
  .stats-inner { gap: var(--space-4); }
  .stat-divider { display: none; }
  .showcase-section { padding: var(--space-10) var(--space-4); }
  .showcase-grid { grid-template-columns: 1fr; }
  .cta-zone { flex-direction: column; width: 100%; }
  .btn-generate, .btn-secondary { width: 100%; justify-content: center; }
  .excuse-actions { gap: var(--space-2); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}