/* ============================================================
   KlabApp — "The Kinetic Terminal" Design System
   ============================================================ */

/* --- Custom Properties ------------------------------------ */
:root {
  /* Tonal Architecture */
  --surface-void:               #0A0A0B;
  --surface-dim:                #131315;
  --surface-container-lowest:   #0E0E10;
  --surface-container-low:      #1B1B1D;
  --surface-container:          #1F1F21;
  --surface-container-high:     #2A2A2C;
  --surface-container-highest:  #353437;
  --surface-bright:             #39393B;

  /* Text */
  --text-primary:     #FAFAFA;
  --text-secondary:   #8A8A8E;
  --text-tertiary:    #5A5A5E;

  /* Accent */
  --accent-primary:         #3B82F6;
  --accent-primary-dim:     #4D8EFF;
  --accent-glow:            rgba(59, 130, 246, 0.15);

  /* Status */
  --status-live:        #4EDEA3;
  --status-beta:        #F59E0B;
  --status-coming-soon: #8A8A8E;
  --status-in-progress: #A78BFA;

  /* Borders & Effects */
  --ghost-border:     rgba(255, 255, 255, 0.06);
  --outline-variant:  rgba(255, 255, 255, 0.10);

  /* Typography */
  --font-heading:   'Space Grotesk', system-ui, sans-serif;
  --font-body:      'Plus Jakarta Sans', system-ui, sans-serif;
  --font-mono:      'JetBrains Mono', 'Fira Code', ui-monospace, monospace;

  /* Spacing rhythm */
  --sp-1:  0.25rem;
  --sp-2:  0.4rem;
  --sp-3:  0.6rem;
  --sp-4:  0.8rem;
  --sp-5:  1.1rem;
  --sp-6:  1.4rem;
  --sp-8:  1.75rem;
  --sp-10: 2.25rem;
  --sp-12: 2.75rem;
  --sp-16: 3.5rem;
  --sp-20: 4.5rem;
  --sp-24: 5.5rem;

  /* Border radius */
  --radius-sm: 2px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows – Double Shadow technique */
  --shadow-ambient:   0px 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-ghost:     0px 0px 1px rgba(255, 255, 255, 0.06);
  --shadow-card-hover: 0 20px 40px rgba(0, 0, 0, 0.35);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--surface-dim);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

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

/* 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;
}

/* --- Noise Overlay ---------------------------------------- */
.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px;
}

/* --- Navigation ------------------------------------------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(19, 19, 21, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--sp-4) var(--sp-8);
  height: 56px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.nav-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  background: var(--accent-primary);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text-primary);
}

.nav-link--icon {
  display: flex;
  align-items: center;
}

.nav-link:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* --- Hero ------------------------------------------------- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--sp-24) var(--sp-8);
  overflow: hidden;
  background: var(--surface-void);
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(59, 130, 246, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 70% 60%, rgba(78, 222, 163, 0.06) 0%, transparent 60%);
  animation: heroGradientShift 12s ease-in-out infinite alternate;
}

@keyframes heroGradientShift {
  0%   { opacity: 1;   transform: scale(1)   translate(0, 0); }
  100% { opacity: 0.7; transform: scale(1.08) translate(-2%, 3%); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
}

.hero-title {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-brand {
  display: block;
  font-size: clamp(3rem, 8vw, 5.5rem);
  background: linear-gradient(135deg, var(--text-primary) 60%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-tagline {
  margin-top: var(--sp-5);
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--text-secondary);
  font-weight: 400;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-12);
  padding: var(--sp-4) var(--sp-8);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9375rem;
  color: #fff;
  background: var(--accent-primary);
  border-radius: var(--radius-sm);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
  transition: box-shadow 0.25s ease, transform 0.2s ease;
}

.hero-cta:hover {
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
  transform: translateY(-1px);
}

.hero-cta:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 4px;
}

.hero-cta svg {
  animation: bounceDown 2s ease-in-out infinite;
}

@keyframes bounceDown {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(3px); }
}

/* --- Section shared -------------------------------------- */
.section-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--sp-24) var(--sp-8);
}

.section-header {
  margin-bottom: var(--sp-16);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-subtitle {
  margin-top: var(--sp-3);
  font-size: 1rem;
  color: var(--text-secondary);
}

/* --- Search Bar ------------------------------------------- */
.search-bar {
  position: relative;
  max-width: 400px;
  margin-bottom: var(--sp-12);
}

.search-icon {
  position: absolute;
  left: var(--sp-5);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: var(--sp-4) var(--sp-5) var(--sp-4) calc(var(--sp-5) + 26px);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
}

/* --- Apps Section ----------------------------------------- */
.apps-section {
  background: var(--surface-container-lowest);
}

/* --- App Grid -------------------------------------------- */
.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-8);
}

/* --- App Card -------------------------------------------- */
.app-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  cursor: pointer;
  outline: none;
  text-decoration: none;
  color: inherit;

  /* Entrance animation */
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;

  /* Hover transition */
  transition:
    transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.25s ease,
    border-color 0.25s ease,
    background 0.25s ease;
}

.app-card:hover {
  transform: translateY(-4px);
  background: var(--surface-container-high);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--card-accent, var(--ghost-border));
}

.app-card:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  transform: translateY(-4px);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Card icon */
.card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  font-size: 1.5rem;
  background: var(--surface-container-high);
  margin-bottom: var(--sp-5);
  transition: background 0.25s ease;
}

.app-card:hover .card-icon {
  background: var(--surface-bright);
}

/* Card name */
.card-name {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

/* Card description */
.card-desc {
  margin-top: var(--sp-2);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Card meta row (status + url) */
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  margin-top: auto;
  padding-top: var(--sp-6);
}

/* Status badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.status-badge--live {
  color: var(--status-live);
  background: rgba(78, 222, 163, 0.10);
}

.status-badge--beta {
  color: var(--status-beta);
  background: rgba(245, 158, 11, 0.10);
}

.status-badge--coming-soon {
  color: var(--status-coming-soon);
  background: rgba(138, 138, 142, 0.10);
}

.status-badge--in-progress {
  color: var(--status-in-progress);
  background: rgba(167, 139, 250, 0.10);
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Card URL */
.card-url {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* No results */
.no-results {
  text-align: center;
  padding: var(--sp-16) 0;
  font-size: 1rem;
  color: var(--text-secondary);
}

/* --- About Section --------------------------------------- */
.about-section {
  background: var(--surface-dim);
}

.about-text {
  max-width: 580px;
  margin-top: var(--sp-5);
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.about-links {
  display: flex;
  gap: var(--sp-8);
  margin-top: var(--sp-10);
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-5);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-container-low);
  border-radius: var(--radius-md);
  transition: color 0.2s ease, background 0.2s ease;
}

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

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

/* --- Footer ---------------------------------------------- */
.site-footer {
  background: var(--surface-container-lowest);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: var(--sp-10) var(--sp-8);
  text-align: center;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* =========================================================
   Responsive
   ========================================================= */

/* Tablet: 640–1023 */
@media (max-width: 1023px) {
  .app-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .app-card {
    padding: 20px;
  }
}

/* Mobile: <640 */
@media (max-width: 639px) {
  .nav-inner {
    padding: var(--sp-3) var(--sp-5);
  }

  .nav-wordmark {
    font-size: 1rem;
  }

  .hero {
    min-height: 80vh;
    min-height: 80dvh;
    padding: var(--sp-16) var(--sp-5);
  }

  .section-inner {
    padding: var(--sp-16) var(--sp-5);
  }

  .app-grid {
    grid-template-columns: 1fr;
  }

  .app-card {
    padding: 16px;
  }

  .search-bar {
    max-width: 100%;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}

/* Light mode (optional support) */
@media (prefers-color-scheme: light) {
  :root {
    --surface-void:               #FFFFFF;
    --surface-dim:                #F5F5F5;
    --surface-container-lowest:   #FAFAFA;
    --surface-container-low:      #F0F0F0;
    --surface-container:          #E8E8E8;
    --surface-container-high:     #DEDEDE;
    --surface-container-highest:  #D4D4D4;
    --surface-bright:             #C8C8C8;

    --text-primary:     #0A0A0B;
    --text-secondary:   #5A5A5E;
    --text-tertiary:    #8A8A8E;

    --ghost-border:     rgba(0, 0, 0, 0.06);
    --outline-variant:  rgba(0, 0, 0, 0.10);

    --shadow-card-hover: 0 20px 40px rgba(0, 0, 0, 0.08);
  }

  .noise-overlay {
    opacity: 0.02;
  }

  .hero-brand {
    background: linear-gradient(135deg, var(--text-primary) 60%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
  }

  .site-nav {
    background: rgba(245, 245, 245, 0.8);
  }
}