/* ==========================================================================
   YouTube Video Downloader - Official Brand Styling
   Clean, Minimal, Modern Layout with Authentic YouTube Red & Brand Accents
   ========================================================================== */

:root {
  /* Official YouTube Brand Colors */
  --yt-red: #FF0000;
  --yt-red-dark: #CC0000;
  --yt-red-hover: #D90000;
  --yt-red-subtle: rgba(255, 0, 0, 0.08);
  --yt-red-border: rgba(255, 0, 0, 0.25);

  --yt-black: #0F0F0F;
  --yt-black-surface: #1E1E1E;
  --yt-black-card: #272727;
  --yt-border-dark: #3F3F3F;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-black: #0F0F0F;
  --color-gray-dark: #212121;
  --color-gray-mid: #606060;
  --color-gray-light: #F2F2F2;
  --color-border: #E5E5E5;
  --color-border-light: #EEEEEE;

  /* Status Colors */
  --color-error-bg: #FFEBE9;
  --color-error-border: #FA755A;
  --color-error-text: #C32A2A;
  --color-success: #2BA640;

  --font-main: 'Plus Jakarta Sans', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.16);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.25);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-white);
  color: var(--color-black);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   1. Minimal Header: ONLY the Official YouTube Logo
   ========================================================================== */
.header {
  background: var(--yt-red);
  width: 100%;
  padding: 24px 20px 14px 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-inner {
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.2s ease;
}

.logo-link:hover {
  transform: scale(1.05);
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.2));
}

.youtube-header-logo {
  width: 140px;
  height: 32px;
  display: block;
}

/* ==========================================================================
   2. Hero Section: YouTube Red Branding (#FF0000)
   ========================================================================== */
.hero-section {
  background: var(--yt-red);
  padding: 18px 20px 76px 20px;
  width: 100%;
  position: relative;
}

.hero-container {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  color: var(--color-white);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 8px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   Downloader Input Form
   ========================================================================== */
.downloader-form {
  display: flex;
  gap: 12px;
  background: transparent;
  width: 100%;
  margin-bottom: 24px;
}

.input-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.url-input {
  width: 100%;
  height: 54px;
  background-color: var(--color-white);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  padding: 0 46px 0 48px;
  font-size: 0.98rem;
  font-family: inherit;
  color: var(--color-black);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  outline: none;
}

.url-input::placeholder {
  color: #909090;
  font-weight: 400;
}

.url-input:focus {
  border-color: var(--yt-black);
  box-shadow: 0 0 0 4px rgba(15, 15, 15, 0.2);
}

.paste-btn,
.clear-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--color-gray-mid);
  transition: all 0.15s ease;
}

.paste-btn {
  left: 12px;
}

.paste-btn:hover {
  color: var(--yt-red);
  background-color: rgba(255, 0, 0, 0.08);
}

.clear-btn {
  right: 12px;
}

.clear-btn:hover {
  color: var(--color-black);
  background-color: var(--color-gray-light);
}

/* Primary Download Button */
.download-btn {
  height: 54px;
  padding: 0 32px;
  background-color: var(--yt-black);
  color: var(--color-white);
  border: 2px solid var(--yt-black);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  outline: none;
}

.download-btn:hover {
  background-color: #212121;
  border-color: #212121;
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

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

.download-btn:disabled {
  opacity: 0.75;
  cursor: not-allowed;
  transform: none;
}

/* ==========================================================================
   Feedback: Loading / Status / Error
   ========================================================================== */
.status-container {
  margin: 16px auto 24px;
  padding: 14px 20px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  backdrop-filter: blur(8px);
  max-width: 580px;
  text-align: center;
}

.status-loading {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 500;
}

.pulse-dot {
  width: 10px;
  height: 10px;
  background-color: var(--color-white);
  border-radius: 50%;
  animation: pulseAnim 1.2s infinite ease-in-out;
}

@keyframes pulseAnim {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.3);
    opacity: 1;
  }
}

.error-container {
  margin: 16px auto 24px;
  padding: 16px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-start;
  gap: 14px;
  max-width: 680px;
  text-align: left;
  box-shadow: var(--shadow-md);
}

.error-icon {
  color: var(--color-error-text);
  flex-shrink: 0;
  margin-top: 2px;
}

.error-content strong {
  display: block;
  color: var(--color-error-text);
  font-size: 0.95rem;
  margin-bottom: 3px;
}

.error-content p {
  color: var(--color-gray-dark);
  font-size: 0.9rem;
  line-height: 1.4;
  margin-bottom: 6px;
}

.error-action-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--yt-red);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: 4px;
  transition: opacity 0.15s ease;
}

.error-action-link:hover {
  text-decoration: underline;
}

/* Spinner */
.spinner {
  width: 20px;
  height: 20px;
  animation: rotateSpinner 1s linear infinite;
}

.spinner-track {
  opacity: 0.25;
}

.spinner-head {
  opacity: 0.9;
}

@keyframes rotateSpinner {
  100% {
    transform: rotate(360deg);
  }
}

/* ==========================================================================
   Result Card: Real Video Preview & Download Options
   ========================================================================== */
.result-container {
  margin-top: 32px;
  text-align: left;
}

.result-card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: 280px 1fr;
  transition: all 0.3s ease;
}

.result-video-wrapper {
  background-color: var(--yt-black);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
}

.video-preview {
  width: 100%;
  height: 100%;
  max-height: 380px;
  object-fit: cover;
  display: block;
  background-color: #000;
}

.audio-preview-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  width: 100%;
  text-align: center;
  color: var(--color-white);
}

.audio-label {
  margin-top: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.9);
}

.audio-controls {
  width: 90%;
  margin-top: 14px;
  height: 36px;
}

.result-details {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.result-meta-top {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.verified-badge {
  background-color: #E7F6E9;
  color: var(--color-success);
}

.quality-badge {
  background-color: var(--color-gray-light);
  color: var(--color-gray-dark);
}

.video-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-black);
  line-height: 1.35;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-creator {
  font-size: 0.9rem;
  color: var(--color-gray-mid);
  font-weight: 500;
  margin-bottom: 16px;
}

/* Quality Selector Buttons */
.quality-selector-wrapper {
  margin-bottom: 16px;
  padding: 12px;
  background-color: var(--color-gray-light);
  border-radius: var(--radius-md);
}

.quality-select-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-gray-mid);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.quality-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quality-btn {
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  color: var(--color-black);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.quality-btn:hover {
  border-color: var(--yt-red);
  color: var(--yt-red);
}

.quality-btn.active {
  background-color: var(--yt-red);
  border-color: var(--yt-red);
  color: var(--color-white);
}

.meta-row {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gray-mid);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.meta-val {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-black);
}

/* Result Action Buttons */
.result-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.18s ease;
  outline: none;
}

.download-action-btn {
  background-color: var(--yt-red);
  color: var(--color-white);
  border: 1px solid var(--yt-red);
  box-shadow: 0 4px 12px rgba(255, 0, 0, 0.25);
}

.download-action-btn:hover {
  background-color: var(--yt-red-dark);
  border-color: var(--yt-red-dark);
  transform: translateY(-1px);
}

.yt-watch-action-btn {
  background-color: var(--yt-black);
  color: var(--color-white);
  border: 1px solid var(--yt-black);
}

.yt-watch-action-btn:hover {
  background-color: #282828;
  border-color: #282828;
  transform: translateY(-1px);
}

.secondary-action-btn {
  background-color: var(--color-gray-light);
  color: var(--color-gray-dark);
  border: 1px solid var(--color-border);
}

.secondary-action-btn:hover {
  background-color: #E5E5E5;
  color: var(--color-black);
}

.text-action-btn {
  background: transparent;
  color: var(--color-gray-mid);
  border: none;
  font-size: 0.85rem;
  padding: 8px 12px;
}

.text-action-btn:hover {
  color: var(--yt-red);
  text-decoration: underline;
}

/* ==========================================================================
   3. Content Section: Pure White Background (#FFFFFF)
   ========================================================================== */
.content-section {
  background-color: var(--color-white);
  padding: 64px 20px 72px 20px;
  flex: 1;
}

.content-container {
  max-width: 860px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-black);
  text-align: center;
  margin-bottom: 36px;
  letter-spacing: -0.02em;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.step-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: left;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.step-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
  border-color: #D4D4D4;
}

.step-badge {
  width: 38px;
  height: 38px;
  background-color: var(--yt-red);
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.05rem;
  border-radius: var(--radius-pill);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.step-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--color-gray-mid);
  line-height: 1.55;
}

.content-divider {
  width: 100%;
  height: 1px;
  background-color: var(--color-border-light);
  margin: 54px 0 44px;
}

/* Transparency Note Block */
.info-note {
  background-color: #F9F9F9;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--yt-red);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.info-icon {
  color: var(--yt-red);
  flex-shrink: 0;
  margin-top: 2px;
}

.info-text strong {
  display: block;
  font-size: 0.98rem;
  color: var(--color-black);
  margin-bottom: 6px;
}

.info-text p {
  font-size: 0.88rem;
  color: var(--color-gray-mid);
  line-height: 1.6;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  background-color: #FAFAFA;
  border-top: 1px solid var(--color-border-light);
  padding: 32px 20px;
  text-align: center;
}

.footer-container {
  max-width: 680px;
  margin: 0 auto;
}

.footer-disclaimer {
  font-size: 0.82rem;
  color: #8E8E93;
  line-height: 1.5;
  margin-bottom: 8px;
}

.footer-copy {
  font-size: 0.78rem;
  color: #ABABAF;
}

/* Utility Helpers */
.hidden {
  display: none !important;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .downloader-form {
    flex-direction: column;
  }

  .download-btn {
    width: 100%;
  }

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

  .result-video-wrapper {
    min-height: 220px;
    max-height: 280px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .meta-row {
    flex-wrap: wrap;
    gap: 14px;
  }

  .result-actions {
    flex-direction: column;
    align-items: stretch;
  }

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