/* ── Variables ── */
:root {
    --bg-color:      #0a0f1e;
    --bg-secondary:  #111827;
    --card-bg:       #1a2236;
    --card-hover:    #1e2a42;
    --text-color:    #f1f5f9;
    --text-muted:    #7c8fa6;
    --primary:       #38bdf8;
    --primary-hover: #0ea5e9;
    --primary-glow:  rgba(56,189,248,0.18);
    --accent:        #22c55e;
    --accent-glow:   rgba(34,197,94,0.15);
    --warning:       #f59e0b;
    --danger:        #ef4444;
    --danger-glow:   rgba(239,68,68,0.15);
    --border:        #263047;
    --border-active: #38bdf8;
    --nav-height:    64px;
    --radius:        14px;
    --radius-sm:     8px;
    --shadow:        0 4px 24px rgba(0,0,0,0.35);
    --shadow-sm:     0 2px 8px rgba(0,0,0,0.2);
}

/* ── Reset ── */
*, *::before, *::after {
    margin: 0; padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    background-image:
        radial-gradient(ellipse at 20% 10%, rgba(56,189,248,0.04) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 80%, rgba(34,197,94,0.03) 0%, transparent 55%);
    background-attachment: fixed;
}

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

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-color); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ══════════════════════════════════════
   NAVBAR DESKTOP
══════════════════════════════════════ */
.navbar {
    background: rgba(26,34,54,0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 0 1.5rem;
    height: var(--nav-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.nav-brand {
    font-size: 1.2rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
    letter-spacing: -0.5px;
}

.nav-brand i { -webkit-text-fill-color: var(--primary); }

.nav-links {
    display: flex;
    gap: 0.25rem;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 0.5rem 0;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-item {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}
.nav-item:hover { color: var(--primary); background: var(--primary-glow); }
.nav-item.active { color: var(--primary); background: var(--primary-glow); }

/* ── Bottom Nav (Móvil) ── */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    height: 64px;
    /* safe-area para iPhones con barra home */
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: rgba(17,24,39,0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border);
    z-index: 999;
}
.bottom-nav-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 64px;
}
.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    color: var(--text-muted);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    min-width: 48px;
    flex: 1;
}
.bottom-nav-item i { font-size: 1.2rem; }
.bottom-nav-item:hover,
.bottom-nav-item.active { color: var(--primary); }
.bottom-nav-item.active i {
    filter: drop-shadow(0 0 6px var(--primary));
}

@media (max-width: 768px) {
    .bottom-nav { display: block; }
    .navbar .nav-links { display: none; }
    /* Espacio bajo el contenido para no quedar tapado por la bottom-nav */
    .container {
        padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px) + 1rem);
    }
    footer {
        margin-bottom: calc(64px + env(safe-area-inset-bottom, 0px));
    }
}

/* ══════════════════════════════════════
   LAYOUT
══════════════════════════════════════ */
.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: calc(var(--nav-height) + 1.25rem) 1rem 2rem;
}

/* ══════════════════════════════════════
   CARDS
══════════════════════════════════════ */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.4rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.card:hover {
    transform: translateY(-2px);
    border-color: rgba(56,189,248,0.3);
    box-shadow: var(--shadow), 0 0 0 1px rgba(56,189,248,0.08);
}

.card-title {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-value {
    font-size: 2.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.25rem;
}

/* ── Stat Cards (Dashboard) ── */
.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.06;
    border-radius: var(--radius);
}
.stat-card.primary::before  { background: var(--primary); }
.stat-card.accent::before   { background: var(--accent); }
.stat-card.warning::before  { background: var(--warning); }
.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}
.stat-icon {
    width: 48px; height: 48px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 1rem;
}
.stat-icon.primary { background: var(--primary-glow); color: var(--primary); }
.stat-icon.accent  { background: var(--accent-glow);  color: var(--accent);  }
.stat-icon.warning { background: rgba(245,158,11,0.12); color: var(--warning); }
.stat-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}
.stat-value {
    font-size: 2.2rem;
    font-weight: 900;
    line-height: 1;
}
.stat-card.primary .stat-value { color: var(--primary); }
.stat-card.accent  .stat-value { color: var(--accent);  }
.stat-card.warning .stat-value { color: var(--warning); }
.stat-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ── Motivational Banner ── */
.motivation-banner {
    background: linear-gradient(135deg, rgba(56,189,248,0.1), rgba(34,197,94,0.07));
    border: 1px solid rgba(56,189,248,0.2);
    border-radius: var(--radius);
    padding: 1.1rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.95rem;
    font-style: italic;
    color: var(--text-color);
}
.motivation-banner i {
    font-size: 1.5rem;
    color: var(--warning);
    flex-shrink: 0;
    filter: drop-shadow(0 0 6px var(--warning));
}

/* ══════════════════════════════════════
   BUTTONS
══════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    transition: all 0.18s;
    gap: 0.45rem;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: #fff;
    box-shadow: 0 2px 12px rgba(56,189,248,0.3);
}
.btn-primary:hover {
    box-shadow: 0 4px 20px rgba(56,189,248,0.45);
    filter: brightness(1.08);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), #16a34a);
    color: #fff;
    box-shadow: 0 2px 12px rgba(34,197,94,0.3);
}
.btn-accent:hover { filter: brightness(1.08); }

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover { background: var(--primary-glow); }

.btn-danger {
    background: transparent;
    border: 2px solid var(--danger);
    color: var(--danger);
}
.btn-danger:hover { background: var(--danger-glow); }

.btn-youtube {
    background: transparent;
    border: 2px solid #ef4444;
    color: #ef4444;
}
.btn-youtube:hover { background: rgba(239,68,68,0.1); }

/* ══════════════════════════════════════
   FORMS
══════════════════════════════════════ */
.form-group { margin-bottom: 1.1rem; }

label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem 0.9rem;
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-color);
    font-size: 0.95rem;
    appearance: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px var(--primary-glow);
}
select option { background: var(--card-bg); }

/* ══════════════════════════════════════
   TABLES
══════════════════════════════════════ */
.table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
}

table {
    width: 100%;
    min-width: 480px;
    border-collapse: collapse;
}

thead tr {
    background: var(--bg-secondary);
}

th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

tbody tr:hover { background: rgba(56,189,248,0.03); }
tbody tr:last-child td { border-bottom: none; }

/* ══════════════════════════════════════
   BADGES & TAGS
══════════════════════════════════════ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.badge-primary { background: var(--primary-glow); color: var(--primary); }
.badge-accent  { background: var(--accent-glow);  color: var(--accent);  }
.badge-warning { background: rgba(245,158,11,0.12); color: var(--warning); }
.badge-danger  { background: var(--danger-glow);  color: var(--danger);  }

/* ══════════════════════════════════════
   ALERTS
══════════════════════════════════════ */
.alert {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.9rem 1.2rem;
    background: linear-gradient(135deg, rgba(34,197,94,0.15), rgba(34,197,94,0.05));
    border: 1px solid rgba(34,197,94,0.3);
    color: var(--accent);
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    font-weight: 600;
    font-size: 0.9rem;
    animation: slideDown 0.3s ease;
}
.alert::before { content: '✓'; font-weight: 900; }

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ══════════════════════════════════════
   CALENDAR
══════════════════════════════════════ */
.calendar-table { width: 100%; border-collapse: separate; border-spacing: 3px; }

.calendar-table th {
    padding: 0.5rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    border: none;
    text-align: center;
}

.calendar-table td {
    aspect-ratio: 1 / 1.1;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    transition: border-color 0.15s;
}
.calendar-table td:hover { border-color: rgba(56,189,248,0.4); }

.calendar-table td.today {
    border-color: var(--primary);
    background: rgba(56,189,248,0.08);
    box-shadow: 0 0 12px rgba(56,189,248,0.15);
}
.calendar-table td.selected-day {
    border: 2px solid var(--accent);
    background: rgba(34,197,94,0.06);
}

.calendar-day-link {
    display: flex;
    flex-direction: column;
    height: 100%;
    text-align: center;
    justify-content: space-between;
    padding: 0.3rem;
}
.day-number {
    font-size: 0.9rem;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.activity-dots { justify-content: center; }
.dot { width: 6px; height: 6px; border-radius: 50%; }
.activity-icon { font-size: 0.6rem; color: var(--accent); }

/* ══════════════════════════════════════
   EXERCISE CARD (Catálogo)
══════════════════════════════════════ */
.exercise-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.25rem;
    border: 1px solid var(--border);
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.exercise-card:hover {
    transform: translateY(-3px);
    border-color: rgba(56,189,248,0.3);
    box-shadow: var(--shadow), 0 0 20px rgba(56,189,248,0.05);
}
.exercise-card-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-color);
}
.exercise-card-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    align-items: center;
}
.exercise-card-footer { margin-top: auto; }

/* ══════════════════════════════════════
   WORKOUT EXERCISE ROW
══════════════════════════════════════ */
.exercise-row {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--border);
    transition: border-color 0.2s;
}
.exercise-row:hover { border-color: rgba(56,189,248,0.2); }

/* ══════════════════════════════════════
   SECTION HEADERS
══════════════════════════════════════ */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.section-title {
    font-size: 1.3rem;
    font-weight: 800;
}
.section-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

/* ══════════════════════════════════════
   PAGE HEADER
══════════════════════════════════════ */
.page-header {
    margin-bottom: 1.75rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border);
}
.page-header h1 {
    font-size: 1.75rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--text-color) 60%, var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.page-header p { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.35rem; }

/* ══════════════════════════════════════
   EMPTY STATE
══════════════════════════════════════ */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}
.empty-state i {
    font-size: 3.5rem;
    color: var(--border);
    margin-bottom: 1.25rem;
    display: block;
}
.empty-state h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.empty-state p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 2rem; }

/* ══════════════════════════════════════
   DIVIDER
══════════════════════════════════════ */
.divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 768px) {
    .container { padding: 1rem 0.75rem; }
    .page-header h1 { font-size: 1.4rem; }
    .stat-value { font-size: 1.9rem; }
    .grid { grid-template-columns: 1fr; gap: 0.75rem; }
    .exercise-row > div { grid-template-columns: 1fr 1fr !important; }
    .exercise-row > div > *:first-child { grid-column: span 2; }
}

@media (max-width: 400px) {
    .page-header h1 { font-size: 1.2rem; }
    td, th { padding: 0.5rem 0.6rem; }
}