:root {
  /* Açık tema (varsayılan) - logo paletinden: #230527 koyu mor + #F4F2F0 krem. */
  --bg-dark: #f4f2f0; /* isim eski, değer açık: ana zemin (krem) */
  --card-bg: #ffffff; /* beyaz kart */
  --card-border: rgba(var(--surface-rgb), 0.1);
  --text-primary: #230527; /* logo moru - ana metin */
  --text-secondary: #6e5f73; /* mor-gri ikincil */
  --accent-primary: #3a0a44; /* koyu mor - butonlar/vurgu */
  --accent-secondary: #7a2d8f; /* canlı mor - gradient */
  --accent-hover: #230527;
  --success: #0f9d6b;
  --error: #dc2626;
  /* Tema-duyarlı overlay/glow: açık temada koyu mor, dark'ta beyaz/parlak. */
  --surface-rgb: 35, 5, 39; /* overlay rengi (koyu mor) */
  --glow-rgb: 58, 10, 68; /* buton gölgesi (mor) */
}

/* Dark tema - açık temanın tersi. Zemin koyu mor, metin krem, vurgu parlak mor. */
:root[data-theme="dark"] {
  --bg-dark: #170a1c; /* çok koyu mor zemin */
  --card-bg: #241029; /* koyu mor kart */
  --text-primary: #f4f2f0; /* krem */
  --text-secondary: #b3a4b8; /* mor-gri açık */
  --accent-primary: #b14ec9; /* parlak mor (koyu zeminde görünür) */
  --accent-secondary: #d16ba5; /* mor-pembe */
  --accent-hover: #c77ad9;
  --success: #10b981;
  --error: #ef4444;
  --surface-rgb: 255, 255, 255; /* overlay beyaz olur */
  --glow-rgb: 177, 78, 201; /* parlak mor glow */
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Outfit", sans-serif;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
}

/* Background Mesh */
.background-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
  background: var(--bg-dark);
}

.blob {
  position: absolute;
  filter: blur(110px);
  opacity: 0.55;
  animation: float 20s infinite alternate;
}

.blob-1 {
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(
    circle,
    rgba(122, 45, 143, 0.12) 0%,
    rgba(255, 255, 255, 0) 70%
  );
}

.blob-2 {
  bottom: -10%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(
    circle,
    rgba(var(--surface-rgb), 0.08) 0%,
    rgba(255, 255, 255, 0) 70%
  );
  animation-delay: -5s;
}

.blob-3 {
  top: 40%;
  left: 40%;
  width: 40vw;
  height: 40vw;
  background: radial-gradient(
    circle,
    rgba(160, 90, 180, 0.1) 0%,
    rgba(255, 255, 255, 0) 70%
  );
  animation-delay: -10s;
}

@keyframes float {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(10%, 10%) scale(1.1);
  }
}

/* Container & Header */
.container {
  width: 100%;
  max-width: 800px;
  padding: 2rem;
  z-index: 1;
}

.header {
  text-align: center;
  margin-bottom: 3rem;
}

.header h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(
    to right,
    var(--accent-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
}

.brand-icon {
  display: block;
  margin: 0 auto 1.25rem;
  border-radius: 22px;
  box-shadow: 0 10px 28px rgba(var(--surface-rgb), 0.16);
}

.brand-wordmark {
  margin-bottom: 1.25rem;
  line-height: 0;
}

.brand-wordmark img {
  height: 44px;
  width: auto;
}

/* Wordmark koyu mor; dark temada koyu zeminde görünmez, beyaza çeviriyoruz. */
:root[data-theme="dark"] .brand-wordmark img {
  filter: brightness(0) invert(1);
}

.header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Glassmorphism Card */
.glassmorphism {
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 3rem;
  box-shadow: 0 20px 45px -15px rgba(var(--surface-rgb), 0.12);
  transition: all 0.3s ease;
}

/* Upload Zone */
.upload-zone {
  border: 2px dashed rgba(var(--surface-rgb), 0.2);
  border-radius: 16px;
  padding: 4rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent-primary);
  background: rgba(122, 45, 143, 0.06);
  transform: translateY(-2px);
}

.upload-icon {
  width: 64px;
  height: 64px;
  color: var(--accent-primary);
  margin-bottom: 1.5rem;
  transition: transform 0.3s ease;
}

.upload-zone:hover .upload-icon {
  transform: translateY(-5px);
}

.upload-zone h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.upload-zone p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-ghost {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-hover)
  );
  color: white;
  box-shadow: 0 4px 14px 0 rgba(var(--glow-rgb), 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(var(--glow-rgb), 0.22);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(var(--surface-rgb), 0.06);
  color: var(--text-primary);
  border: 1px solid rgba(var(--surface-rgb), 0.12);
}

.btn-secondary:hover {
  background: rgba(var(--surface-rgb), 0.1);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  margin-top: 1rem;
}

.btn-ghost:hover {
  color: var(--text-primary);
}

/* States */
.state {
  text-align: center;
  padding: 2rem 0;
  animation: fadeIn 0.4s ease forwards;
}

.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Loading State */
.spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(var(--surface-rgb), 0.08);
  border-radius: 50%;
  border-top-color: var(--accent-primary);
  animation: spin 1s ease-in-out infinite;
  margin: 0 auto 2rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.state h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.state p {
  color: var(--text-secondary);
}

.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(var(--surface-rgb), 0.08);
  border-radius: 6px;
  margin-top: 2rem;
  overflow: hidden;
  position: relative;
}

.progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 30%;
  background: linear-gradient(
    90deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  border-radius: 6px;
  animation: progress 2s infinite ease-in-out alternate;
}

@keyframes progress {
  0% {
    width: 10%;
    transform: translateX(0);
  }
  100% {
    width: 40%;
    transform: translateX(60vw);
  }
}

/* Success & Error Icons */
.success-icon-container,
.error-icon-container {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto 1.5rem;
}

.success-icon-container {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.error-icon-container {
  background: rgba(239, 68, 68, 0.2);
  color: var(--error);
}

.success-icon,
.error-icon {
  width: 32px;
  height: 32px;
}

.download-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

/* Language toggle */
/* Top controls: tema + dil */
.top-controls {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 10;
  display: flex;
  gap: 0.5rem;
}

.ctrl-btn {
  padding: 0.5rem 0.9rem;
  border-radius: 10px;
  background: var(--card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
}

.ctrl-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

#theme-btn {
  font-size: 1rem;
  padding: 0.5rem 0.7rem;
}

/* API key section */
.key-section {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--card-border);
}

.key-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.key-hint {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 0.9rem;
}

.key-hint a,
.footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

.key-hint a:hover,
.footer a:hover {
  text-decoration: underline;
}

.key-input {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  background: rgba(var(--surface-rgb), 0.04);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.key-input::placeholder {
  color: rgba(148, 163, 184, 0.5);
}

.key-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.key-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.key-remember {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
}

.key-remember input {
  accent-color: var(--accent-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.key-forget {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
}

.key-forget:hover {
  color: var(--error);
}

.key-privacy {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-top: 0.9rem;
  color: var(--text-secondary);
  font-size: 0.82rem;
  line-height: 1.5;
  opacity: 0.85;
}

.lock-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  margin-top: 0.2rem;
  color: var(--success);
}

/* Quiz question-count selector */
.quiz-count-section {
  margin-bottom: 2rem;
}

.count-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.count-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.count-btn {
  flex: 1 1 auto;
  min-width: 52px;
  padding: 0.6rem 0.9rem;
  border-radius: 12px;
  background: rgba(var(--surface-rgb), 0.04);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.count-btn:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.count-btn.active {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 14px 0 rgba(var(--glow-rgb), 0.3);
}

.count-custom {
  width: 100%;
  margin-top: 0.6rem;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  background: rgba(var(--surface-rgb), 0.04);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.count-custom:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Upload rules */
.upload-rules {
  margin-top: 1.25rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
}

.upload-rules code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  background: rgba(var(--surface-rgb), 0.06);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

/* How it works + Example sections */
.section-title {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.how-section {
  margin-top: 4rem;
}

.how-section .section-title {
  margin-bottom: 2rem;
}

.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.how-step {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.5rem;
  text-align: center;
}

.how-num {
  width: 40px;
  height: 40px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  box-shadow: 0 4px 14px rgba(var(--glow-rgb), 0.32);
}

.how-step h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.how-step p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.example-section {
  margin-top: 4rem;
}

.example-grid {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  flex-wrap: wrap;
}

.ex-card {
  flex: 1 1 0;
  min-width: 180px;
  background: rgba(var(--surface-rgb), 0.04);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
}

.ex-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-primary);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.ex-pre {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre-wrap;
  margin: 0;
}

.ex-arrow {
  align-self: center;
  font-size: 1.5rem;
  color: var(--accent-secondary);
  flex: 0 0 auto;
}

.example-note {
  margin-top: 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
  font-style: italic;
}

.example-section #sample-btn {
  display: block;
  margin: 1.5rem auto 0;
  cursor: pointer;
}

/* Footer */
.footer {
  margin-top: 4rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-sep {
  margin: 0 0.6rem;
  opacity: 0.4;
}

@media (max-width: 640px) {
  .download-actions {
    flex-direction: column;
  }
  .header h1 {
    font-size: 2.5rem;
  }
  .glassmorphism {
    padding: 1.75rem;
  }
  .upload-zone {
    padding: 2.5rem 1rem;
  }
  .container {
    padding: 1.25rem;
  }
  .how-steps {
    grid-template-columns: 1fr;
  }
  .example-grid {
    flex-direction: column;
  }
  .ex-arrow {
    transform: rotate(90deg);
  }
  .lang-btn {
    top: 1rem;
    right: 1rem;
  }
}