/* ==========================================================================
   MIDE - Medición Inteligente de Audiencias Digitales
   Estilos CSS Modernos, Sobrios y de Alto Rendimiento
   ========================================================================== */

:root {
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --border-subtle: #e2e8f0;
  --border-focus: #0f172a;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --accent-dark: #0f172a;
  --accent-hover: #1e293b;
  --accent-blue: #2563eb;
  
  --badge-high-bg: #ecfdf5;
  --badge-high-text: #065f46;
  --badge-high-border: #a7f3d0;
  
  --badge-med-bg: #fffbeb;
  --badge-med-text: #92400e;
  --badge-med-border: #fde68a;
  
  --badge-low-bg: #fef2f2;
  --badge-low-text: #991b1b;
  --badge-low-border: #fecaca;
  
  --badge-neutral-bg: #f1f5f9;
  --badge-neutral-text: #475569;
  --badge-neutral-border: #cbd5e1;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Header & Navigation */
.header {
  border-bottom: 1px solid var(--border-subtle);
  background-color: #ffffff;
  padding: 16px 24px;
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-badge {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}

.nav-btn {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.nav-btn:hover {
  color: var(--text-main);
}

.nav-btn-primary {
  background-color: var(--accent-dark);
  color: #ffffff !important;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
}

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

/* Main Container */
.main-content {
  flex: 1;
  max-width: 1080px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Home / Hero Screen */
.hero-wrapper {
  min-height: calc(100vh - 220px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px 20px;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 12px;
  color: var(--text-main);
}

.hero-subtitle {
  font-size: 20px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.hero-description {
  font-size: 16px;
  color: var(--text-light);
  max-width: 520px;
  margin-bottom: 36px;
}

.analyze-box {
  width: 100%;
  max-width: 680px;
  background: var(--bg-card);
  padding: 8px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
  display: flex;
  gap: 8px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.analyze-box:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08);
}

.analyze-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 14px 18px;
  font-size: 16px;
  color: var(--text-main);
  outline: none;
  font-family: inherit;
}

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

.analyze-btn {
  background-color: var(--accent-dark);
  color: #ffffff;
  border: none;
  padding: 0 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.05s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.analyze-btn:hover {
  background-color: var(--accent-hover);
}

.analyze-btn:active {
  transform: scale(0.99);
}

.hero-hints {
  margin-top: 24px;
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-light);
}

.hero-hint-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Loader Screen */
.loader-container {
  display: none;
  margin-top: 32px;
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--accent-dark);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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

.loader-status {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.loader-subtext {
  font-size: 13px;
  color: var(--text-muted);
}

/* Analysis Report Layout */
.report-header {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
}

.video-thumb-wrapper {
  position: relative;
  width: 240px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #0f172a;
  aspect-ratio: 16 / 9;
}

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

.video-duration-badge {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.8);
  color: #ffffff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
}

.video-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.video-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--text-main);
  line-height: 1.3;
}

.video-channel {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.video-subinfo {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

/* Synthesis Banner */
.synthesis-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.synthesis-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.synthesis-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.2px;
  border: 1px solid transparent;
}

.badge-alta {
  background-color: var(--badge-high-bg);
  color: var(--badge-high-text);
  border-color: var(--badge-high-border);
}

.badge-media {
  background-color: var(--badge-med-bg);
  color: var(--badge-med-text);
  border-color: var(--badge-med-border);
}

.badge-baja {
  background-color: var(--badge-low-bg);
  color: var(--badge-low-text);
  border-color: var(--badge-low-border);
}

.badge-insuficiente {
  background-color: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
  border-color: var(--badge-neutral-border);
}

/* Grid of Direct Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.card-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.card-value {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.card-subtext {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 4px;
}

/* Section Title */
.section-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-tag {
  font-size: 12px;
  font-weight: 600;
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

/* MIDE Metrics Table / Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.metric-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}

.metric-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.metric-formula {
  font-size: 11px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--text-light);
}

.metric-val {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
}

.metric-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Method M-I-D-E Breakdown */
.method-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.mide-step {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.mide-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.mide-step:first-child {
  padding-top: 0;
}

.mide-letter {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--text-main);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  flex-shrink: 0;
}

.mide-step-content {
  flex: 1;
}

.mide-step-name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 4px;
}

.mide-step-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* AI Analysis Box */
.ai-box {
  background: var(--bg-card);
  border: 1px solid #cbd5e1;
  border-left: 4px solid var(--accent-dark);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.ai-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.ai-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-badge {
  font-size: 11px;
  font-weight: 600;
  background: #f1f5f9;
  color: #475569;
  padding: 3px 8px;
  border-radius: 4px;
}

.ai-content {
  font-size: 15px;
  color: #1e293b;
  line-height: 1.65;
  white-space: pre-line;
}

.ai-pending {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-muted);
}

.ai-pending[hidden],
.ai-source[hidden] {
  display: none;
}

.ai-spinner {
  width: 18px;
  height: 18px;
  border-width: 2px;
  margin: 0;
  flex-shrink: 0;
}

.ai-source {
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-light);
}

/* Transparency Section */
.transparency-box {
  background: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 32px;
}

.transparency-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.transparency-text {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Error Pages */
.error-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  max-width: 560px;
  margin: 60px auto;
  box-shadow: var(--shadow-md);
}

.error-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.error-message {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.5;
}

.btn-back {
  display: inline-block;
  background-color: var(--accent-dark);
  color: #ffffff;
  padding: 10px 24px;
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius-md);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  background-color: #ffffff;
  padding: 24px;
  margin-top: auto;
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* Responsive */
@media (max-width: 900px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .report-header {
    flex-direction: column;
  }
  .video-thumb-wrapper {
    width: 100%;
    max-width: 360px;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 40px;
  }
  .analyze-box {
    flex-direction: column;
  }
  .analyze-btn {
    padding: 14px;
  }
  .cards-grid,
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .synthesis-banner {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}