/* ============================================================
   Shared Styles — ReproductorPro
   Base variables, resets, and utilities used across all pages.
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-bg: #020617; /* Slate-950 para match total con FuturoAlternativo */
  --color-surface: #0f172a;
  --color-surface-hover: #1e293b;
  --color-border: #334155;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-accent: #e53935;
  --color-accent-hover: #c62828;
  --color-success: #43a047;
  --color-danger: #e53935;
  --color-warning: #fdd835;
  --color-positive: #66bb6a;
  --color-negative: #ef5350;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html,
body {
  background-color: var(--color-bg);
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  line-height: 1.6;
  width: 100%;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

img {
  max-width: 100%;
  display: block;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-positive { color: var(--color-positive); }
.text-negative { color: var(--color-negative); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: 0.5rem; }
.gap-md { gap: 1rem; }

.hidden { display: none !important; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              opacity var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  opacity: 0.9;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
}

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

.btn-secondary {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-border);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #fff;
}

.btn-success {
  background-color: var(--color-success);
  color: #fff;
}

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
}

.btn-icon {
  padding: 0.4rem;
  min-width: 32px;
  min-height: 32px;
}

/* --- Form Elements --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-input {
  padding: 0.5rem 0.75rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(229, 57, 53, 0.2);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-select {
  padding: 0.5rem 0.75rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  cursor: pointer;
}

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

/* --- Card --- */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

/* --- Status Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-playing {
  background-color: rgba(67, 160, 71, 0.15);
  color: var(--color-success);
}

.badge-paused {
  background-color: rgba(253, 216, 53, 0.15);
  color: var(--color-warning);
}

.badge-idle {
  background-color: rgba(136, 136, 136, 0.15);
  color: var(--color-text-muted);
}

/* --- Loading Spinner --- */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-fade { animation: fadeIn var(--transition-normal) ease; }
.animate-slide { animation: slideUp var(--transition-normal) ease; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }