/* ==========================================================================
   STEEL GOAL FITNESS APP - CSS UNIFICADO
   Paleta: Negro #0a0a0a, Verde #1c5d44, Inter + Oswald (Google Fonts)
   ========================================================================== */

/* ==========================================================================
   1. VARIABLES Y RESET GLOBAL
   ========================================================================== */

:root {
    /* Colores base - extraidos de steelgoal.com */
    --bg-dark:         #0a0a0a;
    --bg-section:      #111111;
    --bg-card:         #121212;
    --bg-input:        #1a1a1a;
    --text-main:       #f3f4f6;
    --text-muted:      #a3a3a3;
    --accent:          #1c5d44;
    --accent-hover:    #005f33;
    --accent-light:    #2d8a66;
    --border-color:    #262626;
    --danger:          #ef4444;
    --success:         #22c55e;

    /* Espaciado */
    --spacing-xs:  8px;
    --spacing-sm:  16px;
    --spacing-md:  24px;
    --spacing-lg:  48px;
    --spacing-xl:  80px;

    /* Tipografia */
    --font-body:    'Inter', -apple-system, sans-serif;
    --font-heading: 'Oswald', sans-serif;

    /* Layout */
    --max-width: 600px;
    --nav-height: 72px;

    /* Transiciones */
    --transition: all 0.25s ease;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    background-color: var(--bg-dark);
    color: var(--text-main);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

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

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

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

/* ==========================================================================
   2. TIPOGRAFIA
   ========================================================================== */

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }

p {
    color: var(--text-muted);
    line-height: 1.7;
}

small {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================================
   3. LAYOUT - CONTENEDOR PRINCIPAL Y NAVEGACION
   ========================================================================== */

.app-container {
    max-width: var(--max-width);
    margin: 0 auto;
    width: 100%;
    min-height: 100vh;
    position: relative;
    padding-bottom: var(--nav-height);
}

.main-content {
    width: 100%;
}

/* Cabecera de pagina */
.page-header {
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-dark);
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-header h1 {
    font-size: 1.4rem;
    margin-bottom: 2px;
}

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

/* Contenido de pagina */
.page-content {
    padding: var(--spacing-md);
}

/* ==========================================================================
   4. NAVEGACION INFERIOR (BOTTOM NAV)
   ========================================================================== */

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--max-width);
    background: var(--bg-section);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: var(--nav-height);
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    padding: 8px 12px;
    transition: var(--transition);
    font-family: var(--font-body);
}

.nav-item i {
    font-size: 1.4rem;
}

.nav-item.active {
    color: var(--accent-light);
}

/* Boton central de accion */
.nav-item.action-btn {
    transform: translateY(-14px);
}

.nav-item.action-btn i {
    font-size: 3.2rem;
    color: var(--accent);
    background-color: var(--bg-dark);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--bg-section), 0 4px 16px rgba(28,93,68,0.4);
    transition: var(--transition);
}

.nav-item.action-btn:hover i {
    color: var(--accent-light);
}

/* ==========================================================================
   5. BOTONES
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    border-radius: 0; /* Estilo Steel Goal: sin redondeo */
    text-transform: uppercase;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--accent-light);
    border-color: var(--accent-light);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-main);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-light);
    color: var(--accent-light);
}

.btn-danger {
    background-color: transparent;
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* ==========================================================================
   6. TARJETAS (CARDS)
   ========================================================================== */

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: var(--transition);
}

.card:hover {
    border-color: #333;
}

.card-accent {
    border-left: 3px solid var(--accent);
}

/* ==========================================================================
   7. FORMULARIOS E INPUTS
   ========================================================================== */

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-heading);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 0;
    padding: 14px 16px;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
}

input::placeholder,
textarea::placeholder {
    color: #555;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: none;
    background-color: #1e1e1e;
}

.form-message {
    padding: 12px 16px;
    border-radius: 0;
    margin-bottom: var(--spacing-sm);
    display: none;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}

.form-message.error {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(239, 68, 68, 0.08);
    color: var(--danger);
    border-left-color: var(--danger);
}

.form-message.success {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(28, 93, 68, 0.15);
    color: var(--accent-light);
    border-left-color: var(--accent);
}

/* ==========================================================================
   8. PAGINAS DE AUTENTICACION (LOGIN / REGISTER)
   ========================================================================== */

.auth-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-md);
    background-color: var(--bg-dark);
    background-image: linear-gradient(to bottom, rgba(28, 93, 68, 0.05) 0%, transparent 50%);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--accent-light);
    margin-bottom: var(--spacing-sm);
}

.logo i {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: 2.2rem;
    color: var(--text-main);
    letter-spacing: 2px;
}

.auth-header > p {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.glass-form {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--accent);
    padding: 40px var(--spacing-md);
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ==========================================================================
   9. DASHBOARD - INICIO
   ========================================================================== */

.dashboard-hero {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--bg-section) 0%, var(--bg-dark) 100%);
    border-bottom: 1px solid var(--border-color);
}

.user-greeting h1 {
    font-size: 1.6rem;
    margin-bottom: 4px;
}

.quick-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-bottom: 3px solid var(--accent);
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-card i {
    color: var(--accent-light);
    font-size: 1.4rem;
}

.stat-card .value {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1;
}

.stat-card .label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
}

/* ==========================================================================
   10. CATALOGO DE EJERCICIOS
   ========================================================================== */

.category-filters {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    scrollbar-width: none;
}

.category-filters::-webkit-scrollbar {
    display: none;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    border-radius: 0;
    background: transparent;
    color: var(--text-muted);
    white-space: nowrap;
}

.filter-btn.active,
.filter-btn:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.exercise-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-left: 3px solid transparent;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition);
    cursor: pointer;
    margin-bottom: 8px;
}

.exercise-card:hover {
    border-left-color: var(--accent-light);
    background-color: #161616;
}

.exercise-icon {
    width: 44px;
    height: 44px;
    background-color: rgba(28, 93, 68, 0.15);
    border: 1px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-light);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.exercise-info h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    letter-spacing: 0.5px;
    margin-bottom: 3px;
}

.exercise-info p {
    font-size: 0.82rem;
    line-height: 1.4;
}

.exercise-category {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--accent-light);
    font-family: var(--font-heading);
    margin-top: 4px;
}

/* ==========================================================================
   11. CREADOR DE RUTINAS
   ========================================================================== */

.builder-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.empty-state {
    text-align: center;
    padding: 40px var(--spacing-md);
    color: var(--text-muted);
    border: 1px dashed var(--border-color);
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    display: inline-block;
}

/* ==========================================================================
   12. TRACKER DE ENTRENAMIENTO
   ========================================================================== */

.tracker-header {
    padding: 14px var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-section);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.tracker-header h1 {
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.workout-timer {
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    color: var(--accent-light);
    font-weight: 700;
    letter-spacing: 2px;
}

.table-sets {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-sm);
}

.table-sets th {
    text-align: left;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    padding-bottom: 10px;
    font-family: var(--font-heading);
    border-bottom: 1px solid var(--border-color);
}

.table-sets td {
    padding: 6px 0;
}

.input-set {
    width: 100%;
    max-width: 68px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 0;
    color: var(--text-main);
    padding: 10px 8px;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    transition: var(--transition);
}

.input-set:focus {
    outline: none;
    border-color: var(--accent);
    background-color: #1e1e1e;
}

.btn-check {
    background-color: var(--bg-input);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 44px;
    height: 40px;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 0;
    font-size: 1rem;
}

.btn-check.checked {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-check:hover {
    border-color: var(--accent-light);
}

/* ==========================================================================
   13. PERFIL DE USUARIO
   ========================================================================== */

.profile-avatar {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to bottom, rgba(28,93,68,0.08), transparent);
}

.profile-avatar i {
    font-size: 5rem;
    color: var(--accent-light);
    display: block;
    margin-bottom: var(--spacing-sm);
}

.profile-avatar h2 {
    margin-bottom: 4px;
}

.settings-list {
    display: flex;
    flex-direction: column;
}

.settings-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.settings-item:hover {
    color: var(--accent-light);
}

.settings-item-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.settings-item i {
    font-size: 1.3rem;
    color: var(--text-muted);
}

/* ==========================================================================
   14. MODAL (SELECCION DE EJERCICIOS)
   ========================================================================== */

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.92);
    z-index: 2000;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-md);
}

.modal-overlay.open {
    display: flex;
}

.modal-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--accent);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.1rem;
}

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.3rem;
    transition: var(--transition);
    padding: 4px;
}

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

.modal-search {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.modal-list {
    overflow-y: auto;
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-md) var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.modal-list::-webkit-scrollbar { width: 4px; }
.modal-list::-webkit-scrollbar-thumb { background: var(--border-color); }

.modal-exercise-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.modal-exercise-row:hover {
    color: var(--accent-light);
}

.modal-exercise-row strong {
    font-family: var(--font-heading);
    letter-spacing: 0.3px;
}

/* ==========================================================================
   15. UTILIDADES GENERALES
   ========================================================================== */

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-md) 0;
}

.text-accent { color: var(--accent-light); }
.text-muted  { color: var(--text-muted); }
.text-danger { color: var(--danger); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.gap-sm { gap: var(--spacing-sm); }

.badge {
    display: inline-block;
    padding: 3px 10px;
    font-size: 0.7rem;
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    background-color: rgba(28, 93, 68, 0.2);
    color: var(--accent-light);
    border: 1px solid rgba(28, 93, 68, 0.3);
}

/* ==========================================================================
   16. ESTADOS DE CARGA Y FEEDBACK
   ========================================================================== */

.loading-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--text-muted);
}

.loading-state i {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
    display: inline-block;
}

/* Spinner animation */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.ph-spin {
    animation: spin 1s linear infinite;
}

/* Animacion entrada de secciones */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.3s ease both;
}

/* ==========================================================================
   17. RESPONSIVE - AJUSTES PARA PANTALLA MOVIL
   ========================================================================== */

@media (max-width: 480px) {
    h1 { font-size: 1.6rem; }
    .btn { padding: 12px 24px; font-size: 0.95rem; }
    .glass-form { padding: 28px var(--spacing-sm); }
}

/* ==========================================================================
   18. TOGGLE MOSTRAR / OCULTAR CONTRASENA
   ========================================================================== */

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

.password-wrapper input {
    padding-right: 48px; /* espacio para el boton */
}

.toggle-password {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 48px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.toggle-password:hover {
    color: var(--text-main);
}

/* ==========================================================================
   19. ICONOS DE CATEGORIAS DE EJERCICIO
   ========================================================================== */

.exercise-icon.pecho    { border-color: #e05a50; background-color: rgba(224, 90, 80, 0.1); color: #e05a50; }
.exercise-icon.espalda  { border-color: #5b8dee; background-color: rgba(91,141,238,0.1);  color: #5b8dee; }
.exercise-icon.piernas  { border-color: #f59e0b; background-color: rgba(245,158,11,0.1);  color: #f59e0b; }
.exercise-icon.hombros  { border-color: #8b5cf6; background-color: rgba(139,92,246,0.1);  color: #8b5cf6; }
.exercise-icon.brazos   { border-color: #ec4899; background-color: rgba(236,72,153,0.1);  color: #ec4899; }
.exercise-icon.core     { border-color: #f97316; background-color: rgba(249,115,22,0.1);  color: #f97316; }
.exercise-icon.cardio   { border-color: #ef4444; background-color: rgba(239,68,68,0.1);   color: #ef4444; }
.exercise-icon.full_body { border-color: #1c5d44; background-color: rgba(28,93,68,0.15); color: var(--accent-light); }

/* ==========================================================================
   20. TIMER DE DESCANSO ENTRE SERIES
   ========================================================================== */

/* Overlay del timer (aparece al marcar una serie como completada) */
#rest-timer-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.88);
    z-index: 3000;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-md);
}

#rest-timer-overlay.visible {
    display: flex;
    animation: fadeInUp 0.2s ease both;
}

.rest-timer-label {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.rest-timer-countdown {
    font-family: 'Courier New', monospace;
    font-size: 6rem;
    font-weight: 700;
    color: var(--accent-light);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.rest-timer-progress {
    width: 200px;
    height: 4px;
    background: var(--border-color);
    margin: var(--spacing-sm) auto;
}

.rest-timer-progress-bar {
    height: 100%;
    background: var(--accent);
    transition: width 1s linear;
}

.rest-timer-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.rest-config-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.rest-config-row label {
    flex: 1;
    font-size: 0.9rem;
    text-transform: none;
    letter-spacing: 0;
}

.rest-config-row select {
    width: auto;
    padding: 8px 12px;
    font-size: 0.9rem;
}

/* ==========================================================================
   21. CLASES DE UTILIDAD EXTRA - Eliminación de CSS inline en plantillas PHP
   ========================================================================== */

/* --- Layout helpers --- */
.col-stack        { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.col-stack-xs     { display: flex; flex-direction: column; gap: 8px; }
.row-gap-sm       { display: flex; gap: var(--spacing-sm); }
.flex-shrink-0    { flex-shrink: 0; }
.flex-1           { flex: 1; }
.items-flex-start { align-items: flex-start; }
.overflow-auto    { overflow-y: auto; flex: 1; }
.pt-md            { padding-top: var(--spacing-md); }
.ml-auto          { margin-left: auto; }
.d-none           { display: none; }
.d-block          { display: block; }

/* --- Iconos en página header (perfil / avatar) --- */
.nav-avatar-icon {
    font-size: 2.5rem;
    color: var(--accent-light);
    line-height: 1;
}

/* --- Botones de enlace con icono alineado a la izquierda --- */
.btn-start {
    justify-content: flex-start;
}

/* --- Spinner en estados de carga --- */
.loading-icon {
    font-size: 2rem;
}

/* --- Perfil: datos de la fecha de miembro --- */
.profile-since {
    display: inline-block;
    margin-top: 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Tracker: contenedor de la lista de ejercicios del tracker --- */
.tracker-exercise-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* --- Tracker: cabecera de cada card de ejercicio dentro del tracker --- */
.exercise-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.exercise-card-header h3 {
    margin: 0;
}

/* --- Tracker: selector de descanso (timer-select) --- */
.rest-select-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.rest-select-wrapper i {
    color: var(--text-muted);
    font-size: 1rem;
}

.select-rest {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 0;
    color: var(--text-muted);
    padding: 4px 8px;
    font-size: 0.8rem;
    width: auto;
}

/* --- Tracker: fila de set completada --- */
tr.set-done { opacity: 0.4; }

/* --- Tracker: número de serie en la tabla --- */
.set-number {
    color: var(--text-muted);
    font-family: var(--font-heading);
    letter-spacing: 1px;
}

/* --- Tracker: botón "añadir serie" con borde discontinuo --- */
.btn-add-set {
    border-style: dashed;
    font-size: 0.8rem;
    padding: 6px 14px;
}

/* --- Rutinas: progress bar del timer (width se setea con JS) --- */
.progress-full { width: 100%; }

/* --- Rutinas: nota secundaria del rest timer --- */
.rest-note {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

/* --- Completado screen (pantalla verde al finalizar) --- */
.workout-complete-screen {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: var(--accent);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    flex-direction: column;
}

.workout-complete-screen i {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.workout-complete-screen h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    letter-spacing: 2px;
}

/* --- Modal: cabecera --- */
.modal-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

/* --- Modal: body con buscador --- */
.modal-search-row {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

/* --- Modal: lista de ejercicios scrollable --- */
.modal-ex-list {
    overflow-y: auto;
    flex: 1;
    padding: 0 var(--spacing-md) var(--spacing-sm);
}

.modal-ex-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.modal-ex-row strong {
    font-family: var(--font-heading);
    letter-spacing: 0.3px;
}

/* --- Modal: mensaje sin resultados --- */
.modal-empty {
    padding: var(--spacing-sm) 0;
}

/* --- Constructor de rutinas: contenedor de la vista oculta --- */
.view-hidden { display: none; }

/* --- Constructor: card de ejercicio seleccionado en el builder --- */
.builder-ex-card {
    padding: var(--spacing-sm);
    margin-bottom: 0;
}

/* --- Constructor: header del ejercicio en el card del builder --- */
.builder-ex-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

/* --- Constructor: botón eliminar ejercicio del builder --- */
.btn-remove-ex {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--danger);
    font-size: 1rem;
    padding: 4px;
    transition: var(--transition);
}

.btn-remove-ex:hover { color: #ff6b6b; }

/* --- Constructor: campos series/reps dentro del builder --- */
.builder-inputs { 
    display: grid; 
    grid-template-columns: repeat(3, 1fr); 
    gap: var(--spacing-sm); 
    align-items: end;
}

.builder-field { flex: 1; }

.builder-field label {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
    font-family: var(--font-body);
    text-transform: none;
    letter-spacing: 0;
}

.builder-field .input-set { max-width: 100%; width: 100%; }

/* --- Formulario: último form-group sin margen inferior --- */
.form-group-last { margin-bottom: 0; }

/* --- Modal overlay base (para ejercicios tanto en builder como en tracker) --- */
.modal-overlay-base {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.92);
    z-index: 2000;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-sm);
}

.modal-overlay-base.open { display: flex; }

/* --- Modal overlay centrado (para formularios como crear ejercicio) --- */
.modal-overlay-center {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-overlay-center.open { display: flex; }

/* --- Panel de formulario del modal centrado --- */
.modal-panel-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--accent);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.25s ease both;
}

/* --- Cuerpo del formulario (scrollable si el contenido desborda) --- */
.modal-form-body {
    padding: var(--spacing-md);
    overflow-y: auto;
    flex: 1;
}

/* --- Inputs del formulario modal (siempre 100% de ancho) --- */
.ce-input {
    width: 100%;
    box-sizing: border-box;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 14px;
    font-size: 0.95rem;
    font-family: var(--font-body);
    transition: var(--transition);
    display: block;
}

.ce-input:focus {
    outline: none;
    border-color: var(--accent-light);
    box-shadow: 0 0 0 3px rgba(28, 93, 68, 0.2);
}

.ce-textarea {
    height: 90px;
    resize: none;
}

/* --- Panel interno del modal --- */
.modal-panel-inner {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-top: 3px solid var(--accent);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

/* --- Botón cerrar modal (X) --- */
.btn-modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    padding: 4px;
}

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

/* --- Constructor: selected-exercises stack --- */
.selected-ex-stack {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: var(--spacing-sm);
}

/* ==========================================================================
   22. TIPOS DE EJERCICIO - RIR, CRONOMETRADO Y BADGES
   ========================================================================== */

/* Badge "Cronometrado" para ejercicios de tipo timed */
.badge-timed {
    display: inline-block;
    font-size: 0.7rem;
    font-family: var(--font-heading);
    letter-spacing: 0.5px;
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.4);
    padding: 2px 6px;
    margin-left: 6px;
    vertical-align: middle;
}

/* Select de RIR dentro de la tabla de sets */
.select-rir {
    padding: 4px 6px;
    font-size: 0.85rem;
    width: auto;
    min-width: 52px;
}

/* Overlay del cronometro activo (ejercicio isometrico en curso) */
.rest-timer-overlay-active {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 3500;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-md);
}

.rest-timer-overlay-active.visible {
    display: flex;
    animation: fadeInUp 0.2s ease both;
}

/* Numero grande del cronometro activo */
.live-timer {
    font-size: 7rem;
    color: var(--accent-light);
    font-family: 'Courier New', monospace;
    font-weight: 700;
    line-height: 1;
    margin: var(--spacing-sm) 0;
}

#active-timer-ex-name {
    font-size: 1rem;
    letter-spacing: 4px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

/* ==========================================================================
   23. FILTROS DE CATEGORIA EN EL MODAL DE EJERCICIOS
   ========================================================================== */

/* Franja de chips de filtro horizontal (scrollable en móvil) */
.modal-category-filters {
    display: flex;
    gap: 6px;
    padding: 8px var(--spacing-md);
    overflow-x: auto;
    border-bottom: 1px solid var(--border-color);
    scrollbar-width: none; /* Firefox */
}

.modal-category-filters::-webkit-scrollbar { display: none; }

/* Chip individual */
.modal-filter-btn {
    flex-shrink: 0;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.75rem;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    padding: 5px 12px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.modal-filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent-light);
}

.modal-filter-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* ==========================================================================
   24. PAGINA DE PERFIL - HERO, STATS, PESO Y GRAFICA
   ========================================================================== */

/* --- Hero del perfil --- */
.profile-hero {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.profile-hero-avatar {
    font-size: 4.5rem;
    color: var(--accent-light);
    line-height: 1;
    flex-shrink: 0;
}

.profile-hero-info h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.profile-hero-info p {
    font-size: 0.85rem;
}

.profile-hero-info .profile-since {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: 8px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* --- Grid de estadísticas --- */
.profile-stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.profile-stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-align: center;
    transition: var(--transition);
}

.profile-stat-card i {
    font-size: 1.4rem;
    color: var(--accent-light);
}

.profile-stat-value {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    letter-spacing: 1px;
    color: var(--text-main);
    line-height: 1;
}

.profile-stat-value small {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.profile-stat-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    font-family: var(--font-heading);
}

.profile-stat-card.stat-good i { color: var(--accent-light); }
.profile-stat-card.stat-warn i { color: #f59e0b; }

/* --- Sección header (titulo + badge/botones alineados) --- */
.profile-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

/* Badge de diferencia de peso */
.weight-diff-badge {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    border-radius: 0;
}

.weight-diff-badge.diff-down {
    background: rgba(45, 158, 107, 0.15);
    color: var(--accent-light);
    border: 1px solid rgba(45, 158, 107, 0.35);
}

.weight-diff-badge.diff-up {
    background: rgba(245, 158, 11, 0.12);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

/* --- Input de peso grande --- */
.weight-input-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.weight-input-group {
    position: relative;
    flex: 1;
}

.weight-big-input {
    padding-right: 36px;
    font-size: 1.4rem;
    font-family: var(--font-heading);
    letter-spacing: 1px;
    text-align: center;
    height: 56px;
    width: 100%;
}

.weight-unit {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
}

.weight-date-input {
    width: auto;
    font-size: 0.85rem;
    flex-shrink: 0;
    max-width: 140px;
}

/* --- Mensajes de formulario --- */
.form-message {
    display: none;
    font-size: 0.85rem;
    padding: 8px 12px;
    border-left: 3px solid;
}

.form-message.success {
    border-color: var(--accent);
    background: rgba(45, 158, 107, 0.1);
    color: var(--accent-light);
}

.form-message.error {
    border-color: var(--danger);
    background: rgba(220, 38, 38, 0.08);
    color: #f87171;
}

/* --- Gráfica de peso --- */
.weight-chart-wrap {
    position: relative;
    height: 200px;
    margin-top: var(--spacing-sm);
}

/* Botones de rango temporal de la gráfica */
.chart-period-btns {
    display: flex;
    gap: 4px;
}

.chart-period-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.72rem;
    letter-spacing: 1px;
    padding: 4px 10px;
    cursor: pointer;
    transition: var(--transition);
}

.chart-period-btn:hover   { border-color: var(--accent); color: var(--accent-light); }
.chart-period-btn.active  { background: var(--accent); border-color: var(--accent); color: #fff; }

/* --- Lista del historial de peso --- */
.weight-history {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.weight-history-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-sm);
}

.weight-history-row:last-child { border-bottom: none; }

.weight-history-date {
    color: var(--text-muted);
    font-size: 0.85rem;
    flex: 1;
}

.weight-history-val {
    font-family: var(--font-heading);
    font-size: 1rem;
    letter-spacing: 0.5px;
    color: var(--text-main);
}

/* ==========================================================================
   25. LOGO DEL NAV Y FOOTER DE VERSION
   ========================================================================== */

/* Logo dentro del nav — oculto en móvil (barra inferior), visible en sidebar desktop */
.nav-logo {
    display: none;
    padding: 0 var(--spacing-sm) var(--spacing-md);
}

.nav-logo-img {
    width: 140px;
    height: auto;
    display: block;
    filter: brightness(0) invert(1); /* fuerza blanco para fondos oscuros */
    opacity: 0.9;
}

/* Footer de la app con la versión */
.app-footer {
    display: none; /* oculto en móvil */
}

.app-version {
    font-family: var(--font-heading);
    font-size: 0.65rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    opacity: 0.5;
}