/* ==========================================================================
   Kelime Kutusu - Main Design System & Styles
   Midnight Neon Theme (Electric Purple, Midnight Dark, Neon Accents)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Brand Colors */
  --primary: #6C3EFF;
  --primary-dark: #4A1FCC;
  --primary-light: #A970FF;
  --primary-glow: rgba(108, 62, 255, 0.35);

  /* Midnight Surfaces */
  --bg: #0A0A14;
  --bg-secondary: #0E0E1C;
  --surface: #111120;
  --card-bg: #16162A;
  --card-bg-hover: #1E1E36;
  --border: #2A2A4E;
  --border-light: rgba(255, 255, 255, 0.08);

  /* Feedback Colors (Neon Glow) */
  --correct: #00C96B;
  --correct-glow: rgba(0, 201, 107, 0.3);
  --present: #FFB800;
  --present-glow: rgba(255, 184, 0, 0.3);
  --absent: #2A2A3E;

  /* Colorblind Alternative Palette */
  --cb-correct: #00E5FF;
  --cb-present: #FF9100;

  /* Accents */
  --accent-cyan: #00E5FF;
  --accent-pink: #FF0080;
  --accent-orange: #FF6B00;

  /* Text Colors */
  --text-main: #FFFFFF;
  --text-secondary: #B0B0D0;
  --text-muted: #7070A0;

  /* Fonts */
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Transitions & Shadows */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  --shadow-neon: 0 10px 30px -10px rgba(108, 62, 255, 0.4);
  --shadow-card: 0 15px 35px rgba(0, 0, 0, 0.4);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
}

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

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

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Background Ambient Glows */
body::before {
  content: '';
  position: fixed;
  top: -150px;
  left: -150px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(108, 62, 255, 0.25) 0%, rgba(10, 10, 20, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  bottom: -150px;
  right: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.15) 0%, rgba(10, 10, 20, 0) 70%);
  z-index: -1;
  pointer-events: none;
}

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

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--text-main) 30%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.text-accent {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Section Header */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(108, 62, 255, 0.12);
  border: 1px solid rgba(108, 62, 255, 0.3);
  color: var(--primary-light);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 48px auto;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  z-index: 1000;
  transition: var(--transition-normal);
  background: rgba(10, 10, 20, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.header.scrolled {
  background: rgba(10, 10, 20, 0.92);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
}

.logo-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--primary-glow);
  font-size: 1.3rem;
}

.logo-img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  object-fit: cover;
  box-shadow: 0 0 15px var(--primary-glow);
  border: 1px solid var(--border-light);
  transition: var(--transition-fast);
}

.logo:hover .logo-img {
  transform: scale(1.05);
  box-shadow: 0 0 20px var(--primary-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.nav-btn {
  padding: 10px 22px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 4px 20px var(--primary-glow);
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(108, 62, 255, 0.6);
}

.mobile-toggle {
  display: none;
  font-size: 1.6rem;
  color: var(--text-main);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding-top: 160px;
  padding-bottom: 100px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: rgba(108, 62, 255, 0.15);
  border: 1px solid var(--primary);
  color: #D6C2FF;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: pulse-border 3s infinite alternate;
}

@keyframes pulse-border {
  0% { box-shadow: 0 0 0 0 rgba(108, 62, 255, 0.4); }
  100% { box-shadow: 0 0 0 12px rgba(108, 62, 255, 0); }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero-title span {
  display: block;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}

.store-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.btn-store {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  transition: var(--transition-fast);
}

.btn-store:hover {
  background: var(--card-bg-hover);
  border-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-neon);
}

.btn-store svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.btn-store .btn-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.btn-store .btn-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-store .btn-title {
  font-weight: 700;
  font-size: 1.05rem;
}

.hero-stats-row {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

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

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Phone Mockup Frame */
.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

.phone-mockup {
  width: 320px;
  height: 640px;
  background: var(--bg-secondary);
  border-radius: 44px;
  border: 8px solid #222238;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(108, 62, 255, 0.3);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.phone-notch {
  width: 120px;
  height: 20px;
  background: #222238;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
  z-index: 10;
}

.phone-screen {
  flex: 1;
  padding: 30px 16px 16px 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: radial-gradient(circle at top, #1A1A35 0%, #0A0A14 100%);
}

.phone-app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.phone-app-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-light);
}

.phone-app-icons {
  display: flex;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ==========================================================================
   Features & Game Modes
   ========================================================================== */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.mode-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  opacity: 0;
  transition: var(--transition-fast);
}

.mode-card:hover {
  transform: translateY(-6px);
  background: var(--card-bg-hover);
  border-color: rgba(108, 62, 255, 0.4);
  box-shadow: var(--shadow-card);
}

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

.mode-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(108, 62, 255, 0.12);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
  border: 1px solid rgba(108, 62, 255, 0.2);
}

.mode-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.mode-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.mode-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  color: var(--accent-cyan);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: left;
  transition: var(--transition-fast);
}

.feature-box:hover {
  border-color: var(--primary-light);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Custom Word Box Showcase Section
   ========================================================================== */
.custom-box-section {
  background: linear-gradient(180deg, var(--bg) 0%, var(--surface) 50%, var(--bg) 100%);
}

.showcase-banner {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 50px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.custom-word-demo {
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--border);
}

.word-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.word-chip {
  padding: 8px 16px;
  background: rgba(108, 62, 255, 0.15);
  border: 1px solid var(--primary);
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   FAQ Section Accordion
   ========================================================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
}

.faq-icon {
  font-size: 1.4rem;
  transition: transform 0.3s ease;
  color: var(--primary-light);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 28px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 22px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px 0;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-secondary);
  margin-top: 16px;
  max-width: 360px;
  font-size: 0.95rem;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-main);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Mobile Responsive */
@media (max-width: 992px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-title { font-size: 2.6rem; }
  .store-buttons { justify-content: center; }
  .hero-stats-row { justify-content: center; }
  .features-grid { grid-template-columns: 1fr; }
  .showcase-banner { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .section { padding: 60px 0; }
  .section-title { font-size: 2rem; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}