/* ==========================================================================
   Tscholene — Shared Base Stylesheet
   Foundation CSS for dev.tscholene.com, docklane.tscholene.com, appointly.tscholene.com
   Dark Tech Clean aesthetic — inspired by Linear.app / Vercel
   ========================================================================== */

/* Google Fonts
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ==========================================================================
   1. Design Tokens (CSS Custom Properties)
   ========================================================================== */

:root {
  /* Colors */
  --bg: #0F0F23;
  --bg-card: #1B1B30;
  --bg-elevated: #252540;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent: #22C55E;
  --accent-hover: #16A34A;
  --border: #334155;
  --destructive: #EF4444;

  /* Typography */
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing (4px base grid) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 12px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-slow: 300ms ease-out;

  /* Z-index scale */
  --z-base: 0;
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-overlay: 40;
  --z-nav: 100;
  --z-modal: 1000;
}

/* ==========================================================================
   2. CSS Reset
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
}

/* ==========================================================================
   3. Base Typography
   ========================================================================== */

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
  background-color: var(--bg);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
}

h2 {
  font-size: 2.25rem;
  font-weight: 700;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  max-width: 65ch;
}

a {
  color: var(--accent);
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

code,
pre {
  font-family: var(--font-mono);
}

code {
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--bg-elevated);
  border-radius: 4px;
  color: var(--text-primary);
}

pre {
  padding: var(--space-6);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.7;
}

pre code {
  padding: 0;
  background: none;
  border-radius: 0;
}

small,
.text-small {
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

/* ==========================================================================
   4. Component Classes
   ========================================================================== */

/* --------------------------------------------------------------------------
   4.1 Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
}

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

.btn:active {
  transform: scale(0.97);
}

/* Primary — accent background, dark text */
.btn--primary {
  background-color: var(--accent);
  color: #0F0F23;
}

.btn--primary:hover {
  background-color: var(--accent-hover);
  text-decoration: none;
}

/* Secondary — ghost / outline */
.btn--secondary {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn--secondary:hover {
  background-color: var(--bg-elevated);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   4.2 Card
   -------------------------------------------------------------------------- */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-8);
  transition: transform var(--transition-base),
              border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  border-color: #475569;
}

/* --------------------------------------------------------------------------
   4.3 Navigation
   -------------------------------------------------------------------------- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: rgba(15, 15, 35, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

.nav__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.05em;
}

.nav__logo:hover {
  text-decoration: none;
  color: var(--text-primary);
}

.nav__links {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav__link:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.nav__link.is-active {
  color: var(--text-primary);
  font-weight: 500;
}

/* Language toggle */
.nav__lang {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: transparent;
  border: 1px solid var(--border);
  padding: var(--space-1) var(--space-3);
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.875rem;
  min-height: 44px;
  transition: border-color var(--transition-fast);
}

.nav__lang:hover {
  border-color: #475569;
}

.nav__lang:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav__lang span.is-active {
  color: var(--text-primary);
  font-weight: 600;
}

/* Hamburger menu button */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  gap: 5px;
  z-index: calc(var(--z-nav) + 1);
}

.nav__burger:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav__burger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base),
              opacity var(--transition-base);
  transform-origin: center;
}

/* Hamburger X animation */
.nav__burger.is-open .nav__burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__burger.is-open .nav__burger-line:nth-child(2) {
  opacity: 0;
}

.nav__burger.is-open .nav__burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   4.4 Hero
   -------------------------------------------------------------------------- */

.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-24) var(--space-8);
  padding-top: calc(var(--space-24) + 80px);
}

.hero__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

/* --------------------------------------------------------------------------
   4.5 Section
   -------------------------------------------------------------------------- */

.section {
  padding: var(--space-24) var(--space-8);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__title {
  text-align: center;
  margin-bottom: var(--space-12);
}

/* --------------------------------------------------------------------------
   4.6 Grid
   -------------------------------------------------------------------------- */

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

/* --------------------------------------------------------------------------
   4.7 Footer
   -------------------------------------------------------------------------- */

.footer {
  padding: var(--space-8);
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   4.8 Scroll Reveal Animation
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

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

/* --------------------------------------------------------------------------
   4.9 Accessibility — Skip Link
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: calc(var(--z-modal) + 1);
  padding: var(--space-3) var(--space-6);
  background: var(--accent);
  color: #0F0F23;
  font-weight: 600;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   5. Utilities
   ========================================================================== */

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

/* ==========================================================================
   6. Responsive
   ========================================================================== */

/* Mobile: up to 768px */
@media (max-width: 768px) {
  .grid {
    --cols: 1;
  }

  /* Mobile nav layout */
  .nav__links {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 15, 35, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: var(--space-8);
    gap: var(--space-4);
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-12);
    z-index: var(--z-nav);
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__link {
    font-size: 1.125rem;
    min-height: 48px;
  }

  .nav__burger {
    display: flex;
  }

  /* Tighter spacing on mobile */
  .hero {
    padding-top: calc(var(--space-16) + 80px);
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .section {
    padding: var(--space-16) var(--space-4);
  }

  .card {
    padding: var(--space-6);
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.25rem;
  }
}

/* Tablet: 769px to 1024px */
@media (min-width: 769px) and (max-width: 1024px) {
  .grid {
    --cols: 2;
  }
}

/* ==========================================================================
   7. Reduced Motion
   ========================================================================== */

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

  .reveal {
    opacity: 1;
    transform: none;
  }

  .card:hover {
    transform: none;
  }
}