/*
 * main.css — Toolbox Design System
 * Aesthetic: Industrial Precision — monochrome, razor-sharp, typographically-led
 * Fonts: "DM Mono" (mono display) + "Geist" (body/UI)
 */

/* ─── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,400&family=Instrument+Serif:ital@0;1&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600&display=swap');

/* ─── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Spacing scale */
  --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-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;

  /* Typography */
  --font-mono: 'DM Mono', 'Fira Code', monospace;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Geist', 'Inter', system-ui, sans-serif;
  --font-display: var(--font-mono);

  /* Motion */
  --ease-snappy: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 120ms;
  --duration-base: 220ms;
  --duration-slow: 380ms;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12), 0 2px 6px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.18), 0 4px 12px rgba(0,0,0,0.1);
}

/* ─── Light Theme ────────────────────────────────────────────── */
:root,
.light {
  --bg-base:      #fafafa;
  --bg-elevated:  #ffffff;
  --surface-1:    #f4f4f5;
  --surface-2:    #e4e4e7;
  --surface-3:    #d4d4d8;

  --text-primary:   #09090b;
  --text-secondary: #52525b;
  --text-tertiary:  #a1a1aa;
  --text-inverse:   #fafafa;

  --border:         rgba(0,0,0,0.08);
  --border-strong:  rgba(0,0,0,0.16);

  --accent:         #09090b;
  --accent-fg:      #fafafa;
  --accent-hover:   #27272a;

  --tag-bg:         #f4f4f5;
  --tag-text:       #52525b;

  --drop-zone-bg:   #f4f4f5;
  --drop-zone-active-bg: #e4e4e7;

  --code-bg:        #f4f4f5;

  /* Toast colors */
  --toast-success: #16a34a;
  --toast-error:   #dc2626;
  --toast-warning: #d97706;
  --toast-info:    #2563eb;

  /* Ad placeholder */
  --ad-bg:     #f4f4f5;
  --ad-border: #d4d4d8;
}

/* ─── Dark Theme ─────────────────────────────────────────────── */
.dark {
  --bg-base:      #0a0a0a;
  --bg-elevated:  #111111;
  --surface-1:    #1a1a1a;
  --surface-2:    #242424;
  --surface-3:    #2e2e2e;

  --text-primary:   #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary:  #52525b;
  --text-inverse:   #09090b;

  --border:         rgba(255,255,255,0.07);
  --border-strong:  rgba(255,255,255,0.14);

  --accent:         #fafafa;
  --accent-fg:      #09090b;
  --accent-hover:   #e4e4e7;

  --tag-bg:         #1a1a1a;
  --tag-text:       #a1a1aa;

  --drop-zone-bg:   #111111;
  --drop-zone-active-bg: #1a1a1a;

  --code-bg:        #111111;

  --toast-success: #4ade80;
  --toast-error:   #f87171;
  --toast-warning: #fbbf24;
  --toast-info:    #60a5fa;

  --ad-bg:     #111111;
  --ad-border: #242424;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-base);
  min-height: 100dvh;
  transition: background var(--duration-base) var(--ease-smooth),
              color var(--duration-base) var(--ease-smooth);
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; border: none; background: none; }
input, textarea, select { font: inherit; }

/* ─── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text-primary);
}

.display-title {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* ─── Layout Utilities ───────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 5vw, 3rem);
}

.container-narrow {
  width: 100%;
  max-width: 800px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 5vw, 3rem);
}

/* ─── Navigation ─────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg-base) 85%, transparent);
  transition: background var(--duration-base) var(--ease-smooth),
              border-color var(--duration-base) var(--ease-smooth);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
  gap: var(--space-4);
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav-logo-dot {
  width: 6px;
  height: 6px;
  background: var(--text-primary);
  border-radius: 50%;
  display: inline-block;
}

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

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.5rem 1.125rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--duration-fast) var(--ease-smooth),
              color var(--duration-fast) var(--ease-smooth),
              border-color var(--duration-fast) var(--ease-smooth),
              transform var(--duration-fast) var(--ease-smooth),
              box-shadow var(--duration-fast) var(--ease-smooth);
  line-height: 1;
  letter-spacing: -0.01em;
}

.btn:active { transform: scale(0.97); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--surface-1);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-icon {
  padding: 0.5rem;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  transition: background var(--duration-fast) var(--ease-smooth),
              color var(--duration-fast) var(--ease-smooth);
}
.btn-icon:hover {
  background: var(--surface-1);
  color: var(--text-primary);
}

.btn-sm {
  padding: 0.3125rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
}

/* ─── Language Switcher ──────────────────────────────────────── */
.lang-switcher {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  background: transparent;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.lang-btn:hover {
  background: var(--surface-1);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.375rem);
  right: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  min-width: 7rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(-4px) scale(0.97);
  pointer-events: none;
  transition: opacity var(--duration-fast) var(--ease-smooth),
              transform var(--duration-fast) var(--ease-smooth);
  z-index: 200;
}

.lang-dropdown.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.4375rem 0.625rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  transition: background var(--duration-fast), color var(--duration-fast);
  cursor: pointer;
  width: 100%;
  text-align: left;
}

.lang-option:hover,
.lang-option.active {
  background: var(--surface-1);
  color: var(--text-primary);
}

.lang-option .lang-code {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  min-width: 1.5rem;
}

/* ─── Tool Cards ─────────────────────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.tool-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  background: var(--bg-elevated);
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease-smooth);
  overflow: hidden;
  min-height: 180px;
}

.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--surface-1);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-smooth);
}

.tool-card:hover::before { opacity: 1; }

.tool-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  z-index: 1;
}

.tool-card-tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
  position: relative;
  z-index: 1;
}

.tool-card-name {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  position: relative;
  z-index: 1;
}

.tool-card-desc {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-secondary);
  flex: 1;
  position: relative;
  z-index: 1;
}

.tool-card-arrow {
  margin-top: var(--space-4);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  position: relative;
  z-index: 1;
  transition: transform var(--duration-base) var(--ease-snappy),
              color var(--duration-fast);
  display: inline-block;
}

.tool-card:hover .tool-card-arrow {
  transform: translateX(4px);
  color: var(--text-primary);
}

/* ─── Drop Zone ──────────────────────────────────────────────── */
.drop-zone {
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-8);
  background: var(--drop-zone-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  cursor: pointer;
  transition: border-color var(--duration-fast), background var(--duration-fast);
  text-align: center;
  min-height: 160px;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--drop-zone-active-bg);
}

.drop-zone-icon {
  font-size: 2rem;
  opacity: 0.4;
  line-height: 1;
}

.drop-zone-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.drop-zone-hint {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  letter-spacing: 0.04em;
}

/* ─── Progress Bar ───────────────────────────────────────────── */
.progress-wrap {
  width: 100%;
  background: var(--surface-2);
  border-radius: 999px;
  height: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--text-primary);
  border-radius: 999px;
  width: 0%;
  transition: width 150ms var(--ease-smooth);
}

.progress-bar.indeterminate {
  width: 40%;
  animation: progress-slide 1.4s var(--ease-smooth) infinite;
}

@keyframes progress-slide {
  0%   { transform: translateX(-200%); }
  100% { transform: translateX(350%); }
}

/* ─── Code / Pre Blocks ──────────────────────────────────────── */
pre, code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
  color: var(--text-primary);
  line-height: 1.6;
}

/* ─── Form Controls ──────────────────────────────────────────── */
.input {
  width: 100%;
  padding: 0.5625rem 0.875rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9375rem;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent);
}

.input::placeholder { color: var(--text-tertiary); }

.textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
}

.label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

/* ─── Stat Cards (used in word-counter, hash, etc.) ─────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-3);
}

.stat-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.stat-label {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

/* ─── Tool Page Layout ───────────────────────────────────────── */
.tool-header {
  padding: var(--space-12) 0 var(--space-8);
  border-bottom: 1px solid var(--border);
}

.tool-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.tool-breadcrumb a:hover { color: var(--text-primary); }

.tool-title {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
}

.tool-subtitle {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  max-width: 48ch;
  line-height: 1.6;
}

.tool-body {
  padding: var(--space-8) 0 var(--space-16);
}

/* ─── Ad Placeholder ─────────────────────────────────────────── */
.ad-slot {
  background: var(--ad-bg);
  border: 1px solid var(--ad-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  position: relative;
  overflow: hidden;
}

.ad-slot::before {
  content: attr(data-label);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  position: absolute;
  top: var(--space-2);
  left: var(--space-3);
}

.ad-slot-leaderboard { min-height: 90px; }
.ad-slot-rectangle   { min-height: 250px; }

/* ─── Rich Content (SEO sections) ───────────────────────────── */
.rich-content {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--border);
}

.rich-content h2 {
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.rich-content h3 {
  font-size: 1rem;
  margin-bottom: var(--space-3);
  color: var(--text-secondary);
  font-weight: 500;
}

.rich-content p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
  max-width: 72ch;
}

/* ─── FAQ Accordion ──────────────────────────────────────────── */
.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--space-4) 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-sans);
  transition: color var(--duration-fast);
}

.faq-question:hover { color: var(--text-secondary); }

.faq-chevron {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  flex-shrink: 0;
  margin-top: 0.2em;
  transition: transform var(--duration-base) var(--ease-snappy);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-snappy);
}

.faq-item.open .faq-answer {
  max-height: 600px;
}

.faq-answer-inner {
  padding-bottom: var(--space-4);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 68ch;
}

/* ─── Footer ─────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.footer-tagline::before {
  content: '🔒';
  font-size: 0.7rem;
}

.footer-links {
  display: flex;
  gap: var(--space-4);
}

.footer-link {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  transition: color var(--duration-fast);
}
.footer-link:hover { color: var(--text-primary); }

/* ─── Search Bar ─────────────────────────────────────────────── */
.search-wrap {
  position: relative;
  max-width: 320px;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 0.8rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.5rem 0.875rem 0.5rem 2.25rem;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: border-color var(--duration-fast), background var(--duration-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--border-strong);
  background: var(--bg-elevated);
}

.search-input::placeholder { color: var(--text-tertiary); }

/* ─── Diff View ──────────────────────────────────────────────── */
.diff-added   { background: color-mix(in srgb, #16a34a 12%, transparent); color: #15803d; }
.diff-removed { background: color-mix(in srgb, #dc2626 12%, transparent); color: #b91c1c; }

.dark .diff-added   { background: color-mix(in srgb, #4ade80 10%, transparent); color: #4ade80; }
.dark .diff-removed { background: color-mix(in srgb, #f87171 10%, transparent); color: #f87171; }

/* ─── Scroll Indicator ───────────────────────────────────────── */
.scroll-top-btn {
  position: fixed;
  bottom: 5rem;
  right: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base), transform var(--duration-base);
  z-index: 50;
  cursor: pointer;
}

.scroll-top-btn.visible {
  opacity: 1;
  pointer-events: all;
}

.scroll-top-btn:hover {
  background: var(--surface-3);
  transform: translateY(-2px);
}

/* ─── Skeleton Loader ────────────────────────────────────────── */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--surface-1) 25%,
    var(--surface-2) 50%,
    var(--surface-1) 75%
  );
  background-size: 400% 100%;
  animation: skeleton-shimmer 1.6s var(--ease-smooth) infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-shimmer {
  0%   { background-position: 100% 0; }
  100% { background-position: 0 0; }
}

/* ─── Page Transitions ───────────────────────────────────────── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-up {
  animation: fade-up var(--duration-slow) var(--ease-snappy) both;
}

.animate-fade-up-delay-1 { animation-delay: 60ms; }
.animate-fade-up-delay-2 { animation-delay: 120ms; }
.animate-fade-up-delay-3 { animation-delay: 180ms; }
.animate-fade-up-delay-4 { animation-delay: 240ms; }

/* ─── Utility Classes ────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-mono { font-family: var(--font-mono); }
.text-serif { font-family: var(--font-serif); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.divider { height: 1px; background: var(--border); }

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hide-mobile { display: none !important; }
  .tool-grid { border-radius: var(--radius-lg); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 641px) {
  .hide-desktop { display: none !important; }
}

/* ─── Extra homepage styles ───────────────────────────────────── */
.hero-number {
  font-family: var(--font-mono);
  font-size: clamp(6rem, 18vw, 14rem);
  font-weight: 300;
  letter-spacing: -0.06em;
  line-height: 1;
  color: var(--surface-2);
  position: absolute;
  right: -0.5rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  user-select: none;
}
.tool-card-num {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
}
@media (max-width: 640px) { .hero-number { font-size: clamp(5rem, 24vw, 9rem); } }