/* ============================================
   YOUTUBE THUMBNAIL EXTRACTOR
   ============================================ */

:root {
  --primary: #1877f2;
  --primary-dark: #166fe5;
  --primary-light: #3578e5;
  --youtube: #ff0000;
  --youtube-dark: #cc0000;
  --success: #42b72a;
  --success-dark: #36a420;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #f0f2f5;
  --bg-card: #ffffff;
  --text: #1c1e21;
  --text-light: #65676b;
  --border: #e4e6eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  --radius: 16px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body > .container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ============================================
   HERO
   ============================================ */
.hero-section {
  animation: fadeInUp 0.5s ease-out;
}

.hero-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--youtube) 0%, var(--youtube-dark) 100%);
  border-radius: 50%;
  margin-bottom: 1rem;
  box-shadow: 0 8px 24px rgba(255, 0, 0, 0.25);
}

.hero-icon i {
  font-size: 2rem;
  color: white;
}

h1 {
  color: var(--text);
  font-weight: 700;
  font-size: 2rem;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.05rem;
  max-width: 480px;
  margin: 0 auto 1.25rem;
}

.text-muted {
  color: var(--text-light);
  font-size: 1rem;
}

.feature-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: white;
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: 50px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.feature-pill i {
  color: var(--youtube);
  font-size: 0.75rem;
}

/* ============================================
   TOOL CARD
   ============================================ */
.tool-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.tool-card:hover {
  box-shadow: var(--shadow-xl);
}

.ad-slot {
  min-height: 350px;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   FORM INPUTS
   ============================================ */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.75rem;
  font-weight: 600;
  color: var(--text);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-group {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.input-group:focus-within {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.input-group-text {
  background: var(--youtube) !important;
  color: white !important;
  border: none !important;
  padding: 0.875rem 1.25rem;
  font-size: 1.1rem;
}

.input-group .form-control {
  border: 2px solid var(--border) !important;
  border-left: none !important;
  padding: 0.875rem 1.25rem;
  font-size: 1rem;
  transition: var(--transition);
  background: white;
}

.input-group .form-control:focus {
  outline: none !important;
  border-color: var(--primary) !important;
  border-left: none !important;
  box-shadow: 0 0 0 3px rgba(24, 119, 242, 0.1);
  z-index: 1;
}

.form-text {
  color: var(--text-light);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

/* ============================================
   BUTTONS
   ============================================ */
#searchbtn.btn,
.btn-primary {
  background: linear-gradient(135deg, var(--youtube) 0%, var(--youtube-dark) 100%) !important;
  border: none !important;
  border-radius: 24px !important;
  padding: 0.875rem 2rem !important;
  font-weight: 600 !important;
  font-size: 1rem !important;
  letter-spacing: 0.3px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 14px rgba(255, 0, 0, 0.3) !important;
  color: white !important;
}

#searchbtn.btn:hover,
.btn-primary:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 20px rgba(255, 0, 0, 0.35) !important;
  color: white !important;
  filter: brightness(1.05);
}

#searchbtn.btn:active,
.btn-primary:active {
  transform: translateY(0) !important;
}

.btn-lg {
  padding: 1rem 2.5rem !important;
  font-size: 1.05rem !important;
}

.btn-outline-primary {
  border: 2px solid var(--primary) !important;
  color: var(--primary) !important;
  background: white !important;
  border-radius: 24px !important;
  font-weight: 600 !important;
  transition: var(--transition);
}

.btn-outline-primary:hover {
  background: var(--primary) !important;
  color: white !important;
  transform: translateY(-2px);
}

/* ============================================
   ALERTS
   ============================================ */
#alert.alert {
  border: none !important;
  border-radius: var(--radius-lg) !important;
  padding: 1rem 1.5rem !important;
  box-shadow: var(--shadow-md) !important;
  transition: var(--transition);
  animation: slideDown 0.3s ease-out;
}

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

.alert-warning {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%) !important;
  color: white !important;
}

.bg-success {
  background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%) !important;
  color: white !important;
}

/* ============================================
   SPINNER
   ============================================ */
#spinner .spinner-border {
  width: 3rem;
  height: 3rem;
  border-width: 0.3em;
  border-color: var(--youtube);
  border-right-color: transparent;
}

/* ============================================
   RESULT CARD
   ============================================ */
#result {
  margin: 0 auto 2rem;
  animation: fadeInUp 0.6s ease-out;
}

.result-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transition: var(--transition);
}

.result-card:hover {
  box-shadow: var(--shadow-xl);
}

.result-header {
  background: linear-gradient(135deg, var(--youtube) 0%, var(--youtube-dark) 100%);
  color: white;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.result-header i {
  font-size: 1.25rem;
  opacity: 0.9;
}

.result-header h3 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
}

.result-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.thumbnail-preview {
  position: relative;
  background: #0f0f0f;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.thumbnail-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: var(--transition);
}

.thumbnail-preview:hover img {
  transform: scale(1.03);
}

.thumbnail-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  backdrop-filter: blur(4px);
}

.thumbnail-controls {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  border-left: 1px solid var(--border);
}

.controls-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-light);
  margin: 0;
}

.quality-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.quality-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.65rem 1rem;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  font-family: inherit;
}

.quality-btn:hover {
  border-color: var(--primary-light);
  background: white;
}

.quality-btn.active {
  border-color: var(--youtube);
  background: rgba(255, 0, 0, 0.06);
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
}

.quality-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
}

.quality-dims {
  font-size: 0.78rem;
  color: var(--text-light);
  font-weight: 500;
}

.quality-btn.active .quality-name {
  color: var(--youtube-dark);
}

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.25rem;
}

.action-buttons .btn {
  flex: 1;
  min-width: 120px;
  border-radius: 12px !important;
  font-size: 0.875rem !important;
  padding: 0.6rem 1rem !important;
}

.btn-download {
  background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%) !important;
  border: none !important;
  color: white !important;
  box-shadow: var(--shadow) !important;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md) !important;
  color: white !important;
}

.result-hint {
  font-size: 0.8rem;
  color: var(--text-light);
  margin: 0;
  line-height: 1.5;
}

/* ============================================
   FAQ CARD
   ============================================ */
#bomberInfo.card {
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin: 2rem 0;
  transition: var(--transition);
  animation: fadeInUp 0.6s ease-out;
}

#bomberInfo.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

#bomberInfo .card-header {
  background: var(--primary) !important;
  border: none;
  padding: 1.5rem;
  text-align: center;
}

#bomberInfo .card-header h2 {
  margin: 0;
  color: white;
  font-weight: 700;
  font-size: 1.5rem;
}

#bomberInfo .card-body {
  padding: 2rem;
  background: var(--bg-card);
}

.accordion-item {
  border: 1px solid var(--border) !important;
  border-radius: var(--radius) !important;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.accordion-button {
  background: white !important;
  color: var(--text) !important;
  border: none !important;
  font-weight: 600;
  padding: 1rem 1.5rem;
}

.accordion-button:not(.collapsed) {
  background: var(--primary) !important;
  color: white !important;
  box-shadow: none !important;
}

.accordion-button:focus {
  box-shadow: 0 0 0 3px rgba(24, 119, 242, 0.1) !important;
}

.accordion-body {
  background: white;
  color: var(--text);
  padding: 1.5rem;
  line-height: 1.7;
}

/* ============================================
   BOOTSTRAP OVERRIDES
   ============================================ */
.text-primary {
  color: var(--primary) !important;
}

.bg-primary {
  background-color: var(--primary) !important;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  :root {
    --radius: 14px;
    --radius-lg: 18px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .hero-subtitle,
  .text-muted {
    font-size: 0.9rem;
  }

  .hero-icon {
    width: 60px;
    height: 60px;
  }

  .hero-icon i {
    font-size: 1.6rem;
  }

  .tool-card {
    padding: 1.25rem;
  }

  #searchbtn.btn,
  .btn-primary {
    width: 100%;
  }

  .result-body {
    grid-template-columns: 1fr;
  }

  .thumbnail-controls {
    border-left: none;
    border-top: 1px solid var(--border);
  }

  .action-buttons {
    flex-direction: column;
  }

  .action-buttons .btn {
    width: 100%;
  }

  #bomberInfo .card-body {
    padding: 1.5rem;
  }
}