/* ========================================
   Pantalla de Calendario Académico
   ======================================== */

/* ========================================
   Header con botón de volver (consistente con notas.css)
   ======================================== */
.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.back-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: none;
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--gris-oscuro);
    transition: background-color 0.2s ease;
    padding: 0;
}

.back-btn:active {
    background-color: var(--gris-claro);
}

.back-btn svg {
    width: 24px;
    height: 24px;
}

.page-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gris-oscuro);
    line-height: 1.2;
    margin: 0;
}

/* ========================================
   Month Navigation
   ======================================== */
.month-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-5);
    padding: var(--space-3) 0;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: none;
    background-color: var(--gris-claro);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--gris-oscuro);
    transition: background-color 0.2s ease;
    padding: 0;
}

.nav-btn:active {
    background-color: var(--color-primario);
    color: var(--blanco);
}

.nav-btn svg {
    width: 20px;
    height: 20px;
}

.current-month {
    text-align: center;
    flex: 1;
}

.month-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gris-oscuro);
    line-height: 1.2;
    margin: 0 0 2px 0;
}

.month-subtitle {
    font-size: 14px;
    font-weight: 400;
    color: var(--gris-medio);
    margin: 0;
}

/* ========================================
   Weekday Headers
   ======================================== */
.weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    margin-bottom: var(--space-3);
    background-color: var(--gris-claro);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.weekday {
    text-align: center;
    padding: var(--space-2) 0;
    font-size: 12px;
    font-weight: 600;
    color: var(--gris-medio);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background-color: var(--blanco);
}

/* ========================================
   Calendar Grid
   ======================================== */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--gris-claro);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--space-6);
}

.calendar-day {
    aspect-ratio: 1;
    background-color: var(--blanco);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: var(--space-2);
    position: relative;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.calendar-day:active {
    background-color: var(--gris-claro);
}

.calendar-day.empty {
    background-color: var(--gris-claro);
    cursor: default;
}

.calendar-day.empty:active {
    background-color: var(--gris-claro);
}

.calendar-day.today {
    background-color: var(--color-primario);
}

.calendar-day.today .day-number {
    color: var(--blanco);
    font-weight: 700;
}

.day-number {
    font-size: 16px;
    font-weight: 500;
    color: var(--gris-oscuro);
    line-height: 1;
}

.event-dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    margin-top: 2px;
}

.event-dot.event-exam {
    background-color: var(--rojo-alerta);
}

.event-dot.event-assignment {
    background-color: var(--color-primario);
}

.event-dot.event-class {
    background-color: var(--verde-exito);
}

/* ========================================
   Today's Date
   ======================================== */
.today-date {
    font-size: 14px;
    font-weight: 500;
    color: var(--gris-medio);
}

/* ========================================
   Events List
   ======================================== */
.events-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.event-card {
    background-color: var(--blanco);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    display: flex;
    gap: var(--space-4);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.event-card:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-md);
}

.event-card-class {
    border-left: 4px solid var(--verde-exito);
}

.event-card-assignment {
    border-left: 4px solid var(--color-primario);
}

.event-card-exam {
    border-left: 4px solid var(--rojo-alerta);
}

.event-time {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-width: 60px;
    flex-shrink: 0;
}

.event-hour {
    font-size: 16px;
    font-weight: 700;
    color: var(--gris-oscuro);
    line-height: 1;
}

.event-duration {
    font-size: 12px;
    font-weight: 400;
    color: var(--gris-medio);
    line-height: 1;
}

.event-content {
    flex: 1;
    min-width: 0;
}

.event-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--gris-oscuro);
    line-height: 1.3;
    margin: 0 0 4px 0;
}

.event-location {
    font-size: 14px;
    font-weight: 400;
    color: var(--gris-medio);
    line-height: 1.3;
    margin: 0 0 var(--space-2) 0;
}

.event-footer {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.badge-subject {
    background-color: var(--gris-claro);
    color: var(--gris-medio);
    padding: 4px 8px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    font-weight: 500;
}

.badge-time {
    background-color: var(--verde-claro);
    color: var(--verde-exito);
    padding: 4px 8px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    font-weight: 500;
}

.badge-exam {
    background-color: var(--rojo-claro);
    color: var(--rojo-alerta);
    padding: 4px 8px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    font-weight: 500;
}

.badge-assignment {
    background-color: #E3F2FD;
    color: var(--color-primario);
    padding: 4px 8px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    font-weight: 500;
}

.badge-class {
    background-color: var(--verde-claro);
    color: var(--verde-exito);
    padding: 4px 8px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    font-weight: 500;
}

/* ========================================
   Upcoming Events
   ======================================== */
.upcoming-events {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.upcoming-event {
    background-color: var(--blanco);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.upcoming-event:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-md);
}

.upcoming-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 56px;
    flex-shrink: 0;
}

.upcoming-day {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primario);
    line-height: 1;
}

.upcoming-month {
    font-size: 12px;
    font-weight: 500;
    color: var(--gris-medio);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    line-height: 1;
}

.upcoming-content {
    flex: 1;
    min-width: 0;
}

.upcoming-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--gris-oscuro);
    line-height: 1.3;
    margin: 0 0 2px 0;
}

.upcoming-details {
    font-size: 14px;
    font-weight: 400;
    color: var(--gris-medio);
    line-height: 1.3;
    margin: 0;
}

.upcoming-badge {
    flex-shrink: 0;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calendar-day {
    animation: fadeIn 0.3s ease-out;
}

.calendar-day:nth-child(1) { animation-delay: 0.05s; }
.calendar-day:nth-child(2) { animation-delay: 0.1s; }
.calendar-day:nth-child(3) { animation-delay: 0.15s; }
.calendar-day:nth-child(4) { animation-delay: 0.2s; }
.calendar-day:nth-child(5) { animation-delay: 0.25s; }
.calendar-day:nth-child(6) { animation-delay: 0.3s; }
.calendar-day:nth-child(7) { animation-delay: 0.35s; }
.calendar-day:nth-child(8) { animation-delay: 0.4s; }
.calendar-day:nth-child(9) { animation-delay: 0.45s; }
.calendar-day:nth-child(10) { animation-delay: 0.5s; }
.calendar-day:nth-child(11) { animation-delay: 0.55s; }
.calendar-day:nth-child(12) { animation-delay: 0.6s; }
.calendar-day:nth-child(13) { animation-delay: 0.65s; }
.calendar-day:nth-child(14) { animation-delay: 0.7s; }
.calendar-day:nth-child(15) { animation-delay: 0.75s; }
.calendar-day:nth-child(16) { animation-delay: 0.8s; }
.calendar-day:nth-child(17) { animation-delay: 0.85s; }
.calendar-day:nth-child(18) { animation-delay: 0.9s; }
.calendar-day:nth-child(19) { animation-delay: 0.95s; }
.calendar-day:nth-child(20) { animation-delay: 1s; }
.calendar-day:nth-child(21) { animation-delay: 1.05s; }
.calendar-day:nth-child(22) { animation-delay: 1.1s; }
.calendar-day:nth-child(23) { animation-delay: 1.15s; }
.calendar-day:nth-child(24) { animation-delay: 1.2s; }
.calendar-day:nth-child(25) { animation-delay: 1.25s; }
.calendar-day:nth-child(26) { animation-delay: 1.3s; }
.calendar-day:nth-child(27) { animation-delay: 1.35s; }
.calendar-day:nth-child(28) { animation-delay: 1.4s; }
.calendar-day:nth-child(29) { animation-delay: 1.45s; }
.calendar-day:nth-child(30) { animation-delay: 1.5s; }
.calendar-day:nth-child(31) { animation-delay: 1.55s; }
.calendar-day:nth-child(32) { animation-delay: 1.6s; }
.calendar-day:nth-child(33) { animation-delay: 1.65s; }
.calendar-day:nth-child(34) { animation-delay: 1.7s; }
.calendar-day:nth-child(35) { animation-delay: 1.75s; }

.event-card {
    animation: fadeIn 0.4s ease-out;
}

.event-card:nth-child(1) { animation-delay: 0.2s; }
.event-card:nth-child(2) { animation-delay: 0.3s; }
.event-card:nth-child(3) { animation-delay: 0.4s; }

.upcoming-event {
    animation: fadeIn 0.4s ease-out;
}

.upcoming-event:nth-child(1) { animation-delay: 0.3s; }
.upcoming-event:nth-child(2) { animation-delay: 0.4s; }
.upcoming-event:nth-child(3) { animation-delay: 0.5s; }

/* ========================================
   Calendar Day States
   ======================================== */
.calendar-day.has-event {
    position: relative;
}

.calendar-day.has-event::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    border-radius: var(--radius-full);
    background-color: var(--color-primario);
}

.calendar-day.today.has-event::after {
    background-color: var(--blanco);
}

/* ========================================
   Event Type Colors
   ======================================== */
.event-type-indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    margin-top: 4px;
}

.event-type-exam {
    background-color: var(--rojo-alerta);
}

.event-type-assignment {
    background-color: var(--color-primario);
}

.event-type-class {
    background-color: var(--verde-exito);
}

.event-type-meeting {
    background-color: #FF9800;
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 360px) {
    .event-time {
        min-width: 50px;
    }
    
    .upcoming-date {
        min-width: 48px;
    }
    
    .upcoming-day {
        font-size: 20px;
    }
}