/* ==========================================================================
   Kelimeci Solo — Handcrafted Niche UI/UX Design System
   Human-designed aesthetics: Editorial typography, tactile physical tiles,
   refined zinc/obsidian color palette, 3D flip physics, zero AI-archetype clichés.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500;700&display=swap');

:root {
  /* Color Palette - Niche Dark Obsidian & Zinc */
  --bg-primary: #09090B;
  --bg-secondary: #121215;
  --bg-tertiary: #18181B;
  --bg-card: rgba(24, 24, 27, 0.7);
  --bg-card-hover: rgba(39, 39, 42, 0.8);
  --bg-nav: rgba(9, 9, 11, 0.85);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  --text-primary: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-muted: #71717A;

  /* Niche Game Tile Palette (Muted, Refined Editorial Tones) */
  --tile-correct: #059669;
  --tile-correct-border: #10B981;
  --tile-present: #D97706;
  --tile-present-border: #F59E0B;
  --tile-absent: #27272A;
  --tile-absent-border: #3F3F46;
  --tile-empty-bg: #121215;
  --tile-empty-border: #27272A;

  /* Accent Color */
  --accent-primary: #6366F1;
  --accent-primary-hover: #4F46E5;

  /* Shadows & Depth */
  --shadow-tile: 0 4px 0 0 rgba(0, 0, 0, 0.4);
  --shadow-tile-active: 0 1px 0 0 rgba(0, 0, 0, 0.4);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.5);

  /* Radius & Transitions */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Light Theme Overrides (Warm Off-White Editorial) */
[data-theme="light"] {
  --bg-primary: #FAF9F6;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #F4F4F5;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(244, 244, 245, 0.95);
  --bg-nav: rgba(250, 249, 246, 0.85);

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

  --text-primary: #09090B;
  --text-secondary: #52525B;
  --text-muted: #A1A1AA;

  --tile-correct: #059669;
  --tile-correct-border: #10B981;
  --tile-present: #D97706;
  --tile-present-border: #F59E0B;
  --tile-absent: #E4E4E7;
  --tile-absent-border: #D4D4D8;
  --tile-empty-bg: #FFFFFF;
  --tile-empty-border: #E4E4E7;

  --shadow-tile: 0 4px 0 0 rgba(0, 0, 0, 0.08);
  --shadow-tile-active: 0 1px 0 0 rgba(0, 0, 0, 0.08);
  --shadow-card: 0 20px 40px -15px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.01em;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  user-select: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
  position: relative;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem auto;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.tag-pill svg {
  width: 14px;
  height: 14px;
  color: var(--accent-primary);
}

.section-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Header Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-size: 0.9rem;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.btn-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-cta svg {
  width: 18px;
  height: 18px;
}

.btn-cta-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-cta-outline:hover {
  border-color: var(--accent-primary);
  opacity: 1;
}

.mobile-toggle {
  display: none;
  padding: 0.5rem;
  color: var(--text-primary);
}

/* Hero Section */
.hero {
  padding-top: 9rem;
  padding-bottom: 5rem;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.app-store-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.app-store-btn:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.app-store-btn svg {
  width: 26px;
  height: 26px;
}

.app-store-text small {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.app-store-text strong {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.1;
}

/* Hero Stats Row */
.hero-stats-row {
  display: flex;
  gap: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-box {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  font-family: 'JetBrains Mono', monospace;
}

.stat-lbl {
  font-size: 0.825rem;
  color: var(--text-muted);
}

/* Tactile Interactive Playground (Hero Right Side) */
.hero-playground {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.playground-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.playground-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 700;
}

.playground-controls {
  display: flex;
  gap: 0.4rem;
}

.mode-chip {
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-xs);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.mode-chip.active, .mode-chip:hover {
  background: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

/* Interactive Tile Board */
.tile-board {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.tile-row {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
}

.tile {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  font-family: 'Plus Jakarta Sans', sans-serif;
  text-transform: uppercase;
  color: #FFFFFF;
  box-shadow: var(--shadow-tile);
  border: 1px solid transparent;
  transition: transform 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
  perspective: 1000px;
}

.tile.correct {
  background: var(--tile-correct);
  border-color: var(--tile-correct-border);
}

.tile.present {
  background: var(--tile-present);
  border-color: var(--tile-present-border);
}

.tile.absent {
  background: var(--tile-absent);
  border-color: var(--tile-absent-border);
  color: var(--text-secondary);
}

.tile.empty {
  background: var(--tile-empty-bg);
  border-color: var(--tile-empty-border);
  color: var(--text-primary);
  box-shadow: none;
}

.tile.pop {
  animation: tilePop 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes tilePop {
  0% { transform: scale(0.8); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* On-screen Keyboard Component */
.virtual-keyboard {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.v-row {
  display: flex;
  justify-content: center;
  gap: 0.3rem;
}

.v-key {
  padding: 0.65rem 0.45rem;
  min-width: 30px;
  border-radius: var(--radius-xs);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  box-shadow: 0 2px 0 0 rgba(0, 0, 0, 0.2);
  transition: all var(--transition-fast);
}

.v-key:hover {
  background: var(--border-strong);
  transform: translateY(-1px);
}

.v-key:active {
  transform: translateY(1px);
  box-shadow: none;
}

.v-key.correct { background: var(--tile-correct); color: #FFF; border-color: var(--tile-correct-border); }
.v-key.present { background: var(--tile-present); color: #FFF; border-color: var(--tile-present-border); }
.v-key.absent { background: var(--tile-absent); color: var(--text-muted); }
.v-key.action { min-width: 44px; font-size: 0.75rem; }

/* Bento Grid Niche Cards */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.niche-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  transition: all var(--transition-bounce);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.niche-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.niche-card.span-2 {
  grid-column: span 2;
}

.card-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
}

.card-icon-wrapper svg {
  width: 24px;
  height: 24px;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.975rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Interactive Bento Length Selector Component */
.bento-length-selector {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.len-btn {
  flex: 1;
  padding: 0.6rem 0;
  border-radius: var(--radius-xs);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-align: center;
  transition: all var(--transition-fast);
}

.len-btn.active, .len-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #FFFFFF;
}

/* Interactive Tile Hint Inspector */
.hint-inspector {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.hint-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-xs);
  font-size: 0.825rem;
  font-weight: 700;
  color: #FFFFFF;
}

.hint-pill.green { background: var(--tile-correct); }
.hint-pill.yellow { background: var(--tile-present); }
.hint-pill.gray { background: var(--tile-absent); color: var(--text-secondary); }

/* Screenshots Showcase Grid (Handcrafted Phone Frames) */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.shot-frame {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 480px;
  transition: transform var(--transition-bounce);
}

.shot-frame:hover {
  transform: translateY(-6px);
  border-color: var(--accent-primary);
}

.shot-caption {
  font-size: 0.9rem;
  font-weight: 700;
  text-align: center;
  padding: 0.75rem 0.5rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

/* Human Reviews Grid */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.human-review-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars-svg {
  display: flex;
  gap: 0.25rem;
  color: #F59E0B;
  margin-bottom: 1rem;
}

.review-stars-svg svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-body {
  font-size: 0.975rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
}

.user-meta h4 {
  font-size: 0.9rem;
  font-weight: 700;
}

.user-meta span {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* FAQ Accordion Component */
.faq-wrap {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-box.active {
  border-color: var(--border-strong);
}

.faq-trigger {
  width: 100%;
  padding: 1.35rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  gap: 1rem;
}

.faq-trigger svg {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform var(--transition-bounce);
  flex-shrink: 0;
}

.faq-box.active .faq-trigger svg {
  transform: rotate(180deg);
  color: var(--text-primary);
}

.faq-drawer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
  padding: 0 1.5rem;
  color: var(--text-secondary);
  font-size: 0.975rem;
  line-height: 1.6;
}

.faq-box.active .faq-drawer {
  max-height: 400px;
  padding-bottom: 1.5rem;
}

/* Support Page Layout */
.support-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 2.5rem;
  margin-bottom: 4rem;
}

.support-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.support-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.support-icon-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  flex-shrink: 0;
}

.support-icon-box svg {
  width: 20px;
  height: 20px;
}

/* Legal Container Pages */
.legal-wrapper {
  max-width: 820px;
  margin: 0 auto;
  padding: 8rem 1.5rem 6rem 1.5rem;
}

.legal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 3rem;
}

.legal-title-head {
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
}

.legal-title-head h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.legal-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 2rem 0 0.75rem 0;
}

.legal-body p, .legal-body ul {
  color: var(--text-secondary);
  font-size: 0.975rem;
  margin-bottom: 1rem;
}

.legal-body ul {
  padding-left: 1.25rem;
}

.legal-body li {
  margin-bottom: 0.4rem;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 300px;
}

.footer-heading {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-list a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-list a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Responsive Styles */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .bento-grid {
    grid-template-columns: 1fr 1fr;
  }
  .bento-card.span-2 {
    grid-column: span 1;
  }
  .showcase-grid {
    grid-template-columns: 1fr 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .support-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-150%);
    transition: transform var(--transition-bounce);
    z-index: 999;
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: block;
  }

  .nav-actions .btn-cta-outline {
    display: none;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .bento-grid, .showcase-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
  .hero-stats-row {
    flex-direction: column;
    gap: 1.25rem;
  }
  .tile {
    width: 42px;
    height: 42px;
    font-size: 1.15rem;
  }
}