/* ==========================================================================
   Tema Blue-White dan Blue-Black (YT Downloader)
   Mematuhi standar antislop: bebas AI-slop, kontras tinggi WCAG AA,
   dan responsif di semua ukuran layar.
   ========================================================================== */

:root {
  /* Tema Standar: Blue-White (Terang) */
  --bg-page: #f1f6fd;
  --bg-card: #ffffff;
  --bg-card-subtle: #f8faff;
  --bg-input: #ffffff;
  --border-color: #d1e1f7;
  --border-focus: #1d4ed8;
  --text-main: #0c1829;
  --text-muted: #3d506b;
  --text-dim: #627794;
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --primary-text: #ffffff;
  --badge-bg: #e0edff;
  --badge-text: #1d4ed8;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #991b1b;
  --focus-ring: #2563eb;
  --shadow-sm: 0 1px 2px rgba(12, 24, 41, 0.05);
  --shadow-md: 0 4px 12px rgba(12, 24, 41, 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition-fast: 150ms ease;
}

[data-theme="blue-black"] {
  /* Tema Blue-Black (Gelap) */
  --bg-page: #080d16;
  --bg-card: #0f1726;
  --bg-card-subtle: #141f33;
  --bg-input: #0b121e;
  --border-color: #1c2b42;
  --border-focus: #3b82f6;
  --text-main: #f1f5f9;
  --text-muted: #9bb0cd;
  --text-dim: #647b9b;
  --primary: #2563eb;
  --primary-hover: #3b82f6;
  --primary-text: #ffffff;
  --badge-bg: #192a47;
  --badge-text: #93c5fd;
  --success-bg: #064e3b;
  --success-border: #047857;
  --success-text: #a7f3d0;
  --error-bg: #450a0a;
  --error-border: #991b1b;
  --error-text: #fecaca;
  --focus-ring: #60a5fa;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.45);
}

/* Reset dan Pengaturan Dasar */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* Aksesibilitas Focus Ring (R-32) */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Tata Letak Kontainer */
.container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1rem 0;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--primary);
  color: var(--primary-text);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

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

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

/* Tombol Ganti Tema (R-21, R-34) */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  min-height: 44px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card-subtle);
  color: var(--text-main);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background-color: var(--badge-bg);
  color: var(--primary);
  border-color: var(--primary);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Konten Utama */
.main-content {
  flex: 1;
  padding: 2rem 0 3rem;
}

/* Area Hero / Judul Halaman */
.hero-section {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto;
}

/* Kartu Formulir Konversi */
.converter-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.form-group {
  margin-bottom: 1.25rem;
}

.input-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.url-input {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 5.5rem 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.url-input:focus {
  border-color: var(--border-focus);
  outline: none;
}

.input-quick-actions {
  position: absolute;
  right: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.btn-icon-action {
  background: none;
  border: none;
  padding: 0.4rem 0.6rem;
  min-height: 36px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.btn-icon-action:hover {
  background-color: var(--bg-card-subtle);
  color: var(--primary);
}

/* Opsi Format dan Penyedia */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
  .options-grid {
    grid-template-columns: 1fr;
  }
}

.option-fieldset {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  background-color: var(--bg-card-subtle);
}

.option-legend {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  padding: 0 0.35rem;
}

.radio-group {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.35rem;
}

.radio-label {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  min-height: 44px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
}

.radio-label input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-label:has(input:checked) {
  background-color: var(--badge-bg);
  border-color: var(--primary);
  color: var(--primary);
}

.radio-label:has(input:focus-visible) {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.select-control {
  width: 100%;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  margin-top: 0.35rem;
  font-family: inherit;
  font-size: 0.875rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
}

.select-control:focus {
  border-color: var(--border-focus);
  outline: none;
}

/* Tombol Submit Utama (R-03, R-15) */
.submit-btn {
  width: 100%;
  min-height: 50px;
  background-color: var(--primary);
  color: var(--primary-text);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast), transform 100ms ease;
}

.submit-btn:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.submit-btn:active:not(:disabled) {
  transform: translateY(1px);
}

.submit-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

/* Bagian Status dan Hasil (R-27: Empty, Loading, Error, Result) */
.state-container {
  margin-top: 1.5rem;
}

/* Status Kosong (Empty State) */
.empty-box {
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.5rem;
  text-align: center;
  background-color: var(--bg-card);
}

.empty-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--text-dim);
}

.empty-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.empty-box p {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto 1.25rem;
}

.sample-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.chip-btn {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.4rem 0.8rem;
  min-height: 44px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  background-color: var(--badge-bg);
  color: var(--primary);
  border-color: var(--primary);
}

/* Status Memuat (Loading State) */
.loading-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem;
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1.25rem;
}

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

.loading-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.loading-steps {
  max-width: 380px;
  margin: 1.25rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  text-align: left;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  color: var(--text-dim);
}

.step-item.active {
  color: var(--primary);
  font-weight: 600;
}

.step-item.done {
  color: var(--text-muted);
}

.step-indicator {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.65rem;
}

.step-item.active .step-indicator {
  border-color: var(--primary);
  background-color: var(--badge-bg);
}

.step-item.done .step-indicator {
  border-color: #059669;
  background-color: #ecfdf5;
  color: #059669;
}

/* Status Kesalahan (Error State) */
.error-box {
  background-color: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.error-icon {
  width: 24px;
  height: 24px;
  color: var(--error-text);
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.error-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--error-text);
  margin-bottom: 0.25rem;
}

.error-body p {
  font-size: 0.875rem;
  color: var(--error-text);
  margin-bottom: 0.75rem;
}

.retry-btn {
  background: none;
  border: 1px solid var(--error-text);
  color: var(--error-text);
  padding: 0.35rem 0.75rem;
  min-height: 44px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.retry-btn:hover {
  background-color: var(--error-text);
  color: #ffffff;
}

/* Status Hasil (Result State) */
.result-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.result-header {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 600px) {
  .result-header {
    flex-direction: column;
  }
}

.thumbnail-wrapper {
  position: relative;
  width: 200px;
  height: 112px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-card-subtle);
  flex-shrink: 0;
  border: 1px solid var(--border-color);
}

@media (max-width: 600px) {
  .thumbnail-wrapper {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }
}

.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.duration-tag {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background-color: rgba(0, 0, 0, 0.8);
  color: #ffffff;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

.video-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.video-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 0.5rem;
}

.meta-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--badge-bg);
  color: var(--badge-text);
}

.badge.badge-success {
  background-color: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

/* Tombol Aksi Hasil */
.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.btn-download-primary {
  flex: 2;
  min-width: 180px;
  min-height: 48px;
  background-color: var(--primary);
  color: var(--primary-text);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.btn-download-primary:hover {
  background-color: var(--primary-hover);
}

.btn-download-secondary {
  flex: 1;
  min-width: 140px;
  min-height: 48px;
  background-color: var(--bg-card-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-download-secondary:hover {
  background-color: var(--badge-bg);
  color: var(--primary);
  border-color: var(--primary);
}

/* Detail Teknis Accordion */
.tech-details {
  margin-top: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tech-details summary {
  padding: 0.75rem 1rem;
  background-color: var(--bg-card-subtle);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.tech-details-content {
  padding: 1rem;
  background-color: var(--bg-card);
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.tech-details-content code {
  background-color: var(--bg-card-subtle);
  padding: 0.15rem 0.35rem;
  border-radius: var(--radius-sm);
  word-break: break-all;
}

/* Toast Notifikasi */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background-color: var(--text-main);
  color: var(--bg-card);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  transform: translateY(100px);
  opacity: 0;
  transition: transform 200ms ease, opacity 200ms ease;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Informasi Faktual (R-17, R-38) */
.info-section {
  margin-top: 3rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.info-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.info-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.info-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Footer Situs */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1.5rem 0;
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-credit {
  color: var(--text-muted);
}

.footer-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
}

/* Mengurangi Gerakan Animasi (R-39) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}