/* 
 * STUDYRHYTHMS - Core Stylesheet
 * Optimized for Dark Mode Only
 * GPU-accelerated animations with will-change
 * Mobile-first responsive design
 */

/* STUDYRHYTHM - CORE STYLES */

/* CSS Variables - Dark Mode Only */
:root {
  /* Renk Paleti */
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --secondary: #a78bfa;
  --accent: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --success: #34d399;
  
  /* Background Colors */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  /* Text Colors */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  /* Border Colors */
  --border-color: #475569;
  --border-hover: #64748b;
  
  /* Shadow */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}



/* GENERAL STYLES */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  /* Arka planı doğrudan koyu renk yapıyoruz */
  background-color: #0f172a; 
  /* Yazı rengini doğrudan açık gri yapıyoruz */
  color: #f1f5f9;
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Konteyner */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* Section */
.section {
  padding: 3rem 0;
}

@media (min-width: 768px) {
  .section {
    padding: 4rem 0;
  }
}

/* Başlıklar */
.title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 768px) {
  .title {
    font-size: 3rem;
  }
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 36rem;
}

/* ============================================
   NAVBAR STİLLERİ
   ============================================ */
.navbar {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  will-change: transform;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

@media (min-width: 768px) {
  .nav-container {
    padding: 0 2rem;
  }
}

.nav-logo {
  display: flex;
    align-items: center;
    gap: 0.5rem; /* 0.75rem'den 0.5rem'e düşür */
    flex-shrink: 0; /* Ekleyelim */
}

.nav-logo img {
  height: 2.5rem;
  width: auto;
}

.logo-text {
  font-size: 1.25rem; /* 1.5rem'den 1.25rem'e düşür */
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap; /* Ekleyelim - yazının satır atlamasını engeller */
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 1024px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
}

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

.nav-link.active {
  color: var(--primary);
  background-color: var(--bg-tertiary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0.75rem;
  right: 0.75rem;
  height: 2px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 1px;
}

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

.nav-control-btn {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.nav-control-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.language-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 10rem;
  z-index: 1000;
  overflow: hidden;
}

.language-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.language-option:hover {
  background-color: var(--bg-secondary);
}

/* ============================================
   BUTTON STİLLERİ
   ============================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  text-decoration: none;
  box-shadow: var(--shadow-md);
  will-change: transform;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color var(--transition-normal), border-color var(--transition-normal), transform var(--transition-normal);
  text-decoration: none;
  will-change: transform;
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* ============================================
   KART STİLLERİ
   ============================================ */
.glass-effect {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
}



/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden {
  display: none !important;
}

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.flex-col {
  flex-direction: column;
}

.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }

.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }

.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 1.875rem; }
.text-4xl { font-size: 2.25rem; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* ============================================
   GRID SİSTEMİ
   ============================================ */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ============================================
   ANİMASYONLAR
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

.animate-fadeIn {
  animation: fadeIn 0.3s ease;
}

.animate-slideUp {
  animation: slideUp 0.4s ease;
}

.animate-slideInRight {
  animation: slideInRight 0.3s ease;
}

/* ============================================
   FORM ELEMENTLERİ
   ============================================ */
.input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.select {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
}

.select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-top: 4rem;
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(3, 1fr);
    padding: 0 2rem;
  }
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

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

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 1rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

@media (min-width: 768px) {
  .footer-bottom {
    padding: 1.5rem 2rem 0;
  }
}

/* ============================================
   RESPONSIVE DÜZENLEMELER
   ============================================ */
@media (max-width: 1024px) {
  .title {
    font-size: 2.25rem;
  }
  
  .section {
    padding: 2.5rem 0;
  }
}

@media (max-width: 768px) {
  .title {
    font-size: 2rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .nav-container {
    padding: 0 1rem;
  }
  
  .section {
    padding: 2rem 0;
  }
}

@media (max-width: 480px) {
  .title {
    font-size: 1.75rem;
  }
  
  .btn-primary,
  .btn-secondary {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
  }
  
  .container {
    padding: 0 0.75rem;
  }
}

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* --- EPIC REKLAM KUTUSU - ANİME ENERJİ SİSTEMİ --- */
        .epic-ad-box {
            position: relative;
            background: rgba(15, 23, 42, 0.2); /* Yüksek saydamlık */
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 1.5rem;
            padding: 1.5rem;
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            overflow: hidden;
            z-index: 10;
        }

        /* MANA AKIŞI (Arka planda süzülen mavi noktalar) */
        .epic-ad-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: radial-gradient(circle at center, rgba(59, 130, 246, 0.2) 1px, transparent 1px);
            background-size: 20px 20px;
            opacity: 0.3;
            z-index: -1;
        }

        /* CELESTIAL SLASH (Üzerinden geçen kılıç darbesi ışığı) */
        .epic-ad-box::after {
            content: '';
            position: absolute;
            top: -150%;
            left: -150%;
            width: 40%;
            height: 400%;
            background: linear-gradient(
                to right,
                transparent,
                rgba(59, 130, 246, 0.3),
                rgba(255, 255, 255, 0.5),
                rgba(59, 130, 246, 0.3),
                transparent
            );
            transform: rotate(25deg);
            pointer-events: none;
            opacity: 0;
        }

        /* HOVER: Sarsıntı ve Parlama */
        .epic-ad-box:hover {
            transform: scale(1.01) translateY(-5px);
            border-color: rgba(59, 130, 246, 0.4);
            box-shadow: 0 0 40px rgba(59, 130, 246, 0.2);
            animation: impactShake 0.3s cubic-bezier(.36,.07,.19,.97) both;
        }

        .epic-ad-box:hover::after {
            opacity: 1;
            animation: celestialSlashEffect 0.8s cubic-bezier(0.23, 1, 0.32, 1) forwards;
        }

        .ad-support-text {
            font-size: 10px;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.15em;
            color: #94a3b8;
            opacity: 0.6;
            margin-top: 1rem;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 0.75rem;
            text-align: center;
        }