/* =========================================
   VARIABLES Y TEMA GENERAL
   ========================================= */
:root {
    --bg-main: #2d508a;
    --bg-surface: #4b6fa0;
    --bg-surface-elevated: #354bc4;
    
    --color-text-main: #f1f5f9;
    --color-text-muted: rgba(241, 245, 249, 0.7);
    
    --color-primary: #4963f3;
    --color-primary-hover: #354bc4;
    --color-danger: #e74c3c;
    --color-danger-hover: #c0392b;
    --color-success: rgba(39, 174, 96, 0.85);
    --color-success-hover: #27ae60;
    --color-danger-viva: rgba(192, 57, 43, 0.85);
    --color-parcial: rgba(234, 179, 8, 0.85);

    --border-color: rgba(241, 245, 249, 0.2);
    --radius-sm: 12px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

/* =========================================
   ESTILOS BASE
   ========================================= */
body {
    margin: 0;
    font-family: Inter, Arial, sans-serif;
    background: var(--bg-main);
    color: var(--color-text-main);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    min-height: 100vh;
    line-height: 1.5;
}

/* =========================================
   TABLAS E INICIO DE SESIÓN
   ========================================= */
table {
    border-collapse: collapse;
    width: 100%;
    max-width: 800px;
    margin: 20px 0;
    background-color: var(--bg-surface);
    border: 1px solid var(--color-text-main);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

th, td {
    padding: 15px;
    text-align: center;
    border: 1px solid var(--border-color);
}

th {
    background-color: rgba(1, 22, 112, 0.7);
    color: var(--color-text-main);
}

.Cabecera, .Iniciodesesion {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.Iniciodesesion button, 
.Iniciodesesion a,
[class*="cerrar"] { 
    border-radius: var(--radius-md);
}

/* =========================================
   MENÚ PRINCIPAL (TARJETAS)
   ========================================= */
.container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    width: 100%;
    max-width: 1000px;
    margin-top: 20px;
}

.container h1 {
    width: 100%;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.5em;
}

.card {
    background: rgba(1, 22, 112, 0.7);
    padding: 40px 24px;
    border-radius: var(--radius-xl);
    text-align: center;
    width: 260px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-fast);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 25px rgba(0,0,0,0.4);
    background: rgba(1, 22, 112, 0.9);
}

.card h2 {
    margin-top: 0;
    font-size: 22px;
    margin-bottom: 25px;
    color: var(--color-text-main);
}

.card a {
    display: inline-block;
    background-color: var(--color-primary);
    color: white !important;
    padding: 12px 30px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
    text-transform: uppercase;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.card a:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.05);
}

/* =========================================
   BOTONES Y SELECTORES DE VISTA
   ========================================= */
.btn-volver {
    display: inline-block;
    background-color: var(--color-danger);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: var(--radius-xl);
    font-weight: bold;
    margin-bottom: 20px;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-volver:hover {
    background-color: var(--color-danger-hover);
    transform: scale(1.05);
}

.usuario-actual {
    font-size: 18px;
    color: var(--color-text-main);
    background: rgba(1, 22, 112, 0.7);
    padding: 10px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.selector-vista {
    margin-bottom: 20px;
}

.selector-vista button {
    background: rgba(1, 22, 112, 0.7);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
    border-radius: 10px;
    margin: 0 5px;
    transition: background-color var(--transition-fast);
}

.selector-vista button.activo {
    background: var(--color-primary);
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* =========================================
   TÍTULOS Y CONTROLES DEL CALENDARIO
   ========================================= */
.titulo-recurso {
    font-size: 2.5em;
    text-transform: uppercase;
    margin: 10px 0 25px 0;
    text-align: center;
    color: var(--color-text-main);
}

.controles {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 25px;
    font-size: 22px;
    font-weight: bold;
    color: var(--color-text-main);
}

.flecha {
    cursor: pointer;
    user-select: none;
    font-size: 26px;
    color: var(--color-text-main);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.flecha:hover {
    opacity: 0.7;
    transform: scale(1.2);
}

/* =========================================
   ESTRUCTURA GRID DEL CALENDARIO
   ========================================= */
.calendario {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 15px;
    max-width: 950px;
    width: 100%;
}

.dia-nombre {
    font-weight: bold;
    text-align: center;
    padding: 10px 0;
    font-size: 20px;
    color: var(--color-text-main);
}

.dia {
    padding: 12px;
    border-radius: var(--radius-lg);
    background: rgba(1, 22, 112, 0.3);
    border: 1px solid var(--border-color);
    color: white;
    font-weight: bold;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 260px;
}

.numero-dia {
    font-size: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
    text-align: left;
}

.hoy {
    border: 3px solid var(--color-primary);
    background: rgba(73, 99, 243, 0.2);
}

.vacio {
    visibility: hidden;
}

/* =========================================
   PERIODOS — estilo original (aula)
   ========================================= */
.periodos-dia {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex-grow: 1;
}

.periodo {
    font-size: 14px;
    padding: 8px 5px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: white;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 50px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform var(--transition-fast), filter var(--transition-fast);
}

.periodo:hover {
    filter: brightness(1.15);
    transform: translateY(-2px);
}

.libre   { background-color: var(--color-success); }
.ocupado { background-color: var(--color-danger-viva); }
.parcial {
    background-color: var(--color-parcial);
    border-color: rgba(234, 179, 8, 0.5);
    color: #fff;
}
.parcial:hover { box-shadow: 0 2px 14px rgba(234, 179, 8, 0.3); }

.nombre-ocupante {
    font-size: 11px;
    margin-top: 4px;
    line-height: 1.2;
    text-transform: uppercase;
    font-weight: normal;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}

/* =========================================
   PERIODOS CON STOCK COMPARTIDO
   (portátiles y tablets)
   ========================================= */
.periodo-contenedor {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: rgba(1, 22, 112, 0.2);
}

/* Cabecera del periodo: ordinal + stock */
.periodo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 700;
    padding: 6px 10px;
    cursor: default;
}

.periodo-header.libre {
    background-color: var(--color-success);
    color: #fff;
}

.periodo-header.parcial {
    background-color: var(--color-parcial);
    color: #fff;
}

.periodo-header.ocupado {
    background-color: var(--color-danger-viva);
    color: #fff;
}

.stock-info {
    font-size: 11px;
    font-weight: 500;
    opacity: 0.85;
    background: rgba(0,0,0,0.15);
    padding: 2px 7px;
    border-radius: 20px;
}

/* Fila de cada reserva dentro del periodo */
.reserva-fila {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 5px 8px;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.15);
}

.reserva-usuario {
    flex: 1;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-main);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-transform: uppercase;
}

.reserva-cantidad {
    font-size: 11px;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.btn-mini-borrar {
    background: rgba(192, 57, 43, 0.3);
    border: 1px solid rgba(192, 57, 43, 0.5);
    border-radius: 6px;
    color: #fca5a5;
    cursor: pointer;
    font-size: 11px;
    font-weight: bold;
    padding: 2px 6px;
    transition: background var(--transition-fast), color var(--transition-fast);
    flex-shrink: 0;
    line-height: 1.4;
}

.btn-mini-borrar:hover {
    background: var(--color-danger-viva);
    color: #fff;
    border-color: var(--color-danger);
}

/* Botón añadir nueva reserva en el periodo */
.btn-reservar-periodo {
    background: rgba(73, 99, 243, 0.25);
    border-top: 1px solid var(--border-color);
    color: var(--color-text-main);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 8px;
    text-align: center;
    transition: background var(--transition-fast);
    letter-spacing: 0.03em;
}

.btn-reservar-periodo:hover {
    background: rgba(73, 99, 243, 0.5);
}

/* =========================================
   PANEL ADMIN
   ========================================= */
.admin-panel {
    background: rgba(1, 22, 112, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    width: 100%;
    max-width: 900px;
}

.admin-panel h3 {
    margin-top: 0;
    margin-bottom: 18px;
    font-size: 1.1rem;
    color: var(--color-text-main);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.form-agregar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: flex-end;
}

.form-agregar input,
.form-agregar select {
    background: rgba(1, 22, 112, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--color-text-main);
    font-family: Inter, Arial, sans-serif;
    font-size: 14px;
    padding: 10px 14px;
    transition: border-color var(--transition-fast);
    flex: 1;
    min-width: 160px;
}

.form-agregar input:focus,
.form-agregar select:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

.form-agregar select option {
    background: #2d508a;
    color: var(--color-text-main);
}

.form-agregar input[type="submit"] {
    background: var(--color-primary);
    border-color: transparent;
    color: #fff;
    cursor: pointer;
    font-weight: 700;
    flex: 0 0 auto;
    min-width: auto;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.form-agregar input[type="submit"]:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.btn-borrar {
    background: rgba(192, 57, 43, 0.3);
    border: 1px solid rgba(192, 57, 43, 0.5);
    border-radius: 8px;
    color: #fca5a5;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    padding: 5px 12px;
    text-decoration: none;
    display: inline-block;
    transition: background var(--transition-fast), color var(--transition-fast);
}

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