/* ==========================================================================
   BUNKER ACADEMIC CALENDAR & EVENT PLANNER - CSS
   Ultra-smooth, mobile-first responsive, 60fps animations, touch optimized.
   ========================================================================== */

:root {
    --cal-bg: #05040a;
    --cal-card-bg: rgba(18, 16, 32, 0.75);
    --cal-card-border: rgba(255, 255, 255, 0.08);
    --cal-primary: #6366f1;
    --cal-primary-glow: rgba(99, 102, 241, 0.4);
    --cal-accent: #a855f7;
    --cal-purple: #8b5cf6;
    --cal-pink: #ec4899;
    --cal-cyan: #06b6d4;
    --cal-amber: #f59e0b;
    --cal-green: #10b981;
    --cal-red: #ef4444;
    --cal-blue: #3b82f6;
    --cal-glass-filter: blur(16px);
    --safe-bottom: env(safe-area-inset-bottom, 16px);
    --safe-top: env(safe-area-inset-top, 0px);
}

/* Low-performance mode overrides */
html[data-perf="low"] {
    --cal-card-bg: #11101d;
    --cal-card-border: rgba(255, 255, 255, 0.09);
    --cal-glass-filter: none;
}

html[data-perf="low"] * {
    box-shadow: none !important;
    text-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--cal-bg);
    color: #ffffff;
    min-height: 100vh;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    touch-action: manipulation;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

.no-scrollbar::-webkit-scrollbar {
    display: none;
}
.no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* Glass panel */
.cal-glass {
    background: var(--cal-card-bg);
    border: 1px solid var(--cal-card-border);
    backdrop-filter: var(--cal-glass-filter);
    -webkit-backdrop-filter: var(--cal-glass-filter);
}

/* Navigation Buttons */
.cal-nav-btn {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.cal-nav-btn:active {
    transform: scale(0.92);
}

/* Badges */
.badge-dept {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.02em;
    padding: 3px 8px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.badge-ca {
    background: rgba(139, 92, 246, 0.2);
    color: #c4b5fd;
    border: 1px solid rgba(139, 92, 246, 0.4);
}
.badge-at {
    background: rgba(245, 158, 11, 0.2);
    color: #fcd34d;
    border: 1px solid rgba(245, 158, 11, 0.4);
}
.badge-sem {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.4);
}
.badge-lab {
    background: rgba(6, 182, 212, 0.2);
    color: #67e8f9;
    border: 1px solid rgba(6, 182, 212, 0.4);
}
.badge-holiday {
    background: rgba(16, 185, 129, 0.2);
    color: #6ee7b7;
    border: 1px solid rgba(16, 185, 129, 0.4);
}
.badge-milestone {
    background: rgba(148, 163, 184, 0.2);
    color: #cbd5e1;
    border: 1px solid rgba(148, 163, 184, 0.3);
}

/* Weekday Headers */
.cal-weekday-header {
    text-align: center;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #94a3b8;
    padding: 6px 0;
}

/* Month Grid */
.month-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 4px;
}

@media (min-width: 640px) {
    .month-grid {
        gap: 6px;
    }
}

/* Day Cells — Base / Single Calendar Mode */
.day-cell {
    min-height: 56px;
    border-radius: 14px;
    padding: 5px 6px;
    background: rgba(18, 16, 32, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    transition: background-color 0.22s ease, transform 0.15s ease, border-color 0.22s ease, box-shadow 0.22s ease;
    position: relative;
    overflow: hidden;
    user-select: none;
}

@media (min-width: 640px) {
    .day-cell {
        min-height: 92px;
        padding: 8px 9px;
        border-radius: 18px;
    }
}

.day-cell:hover {
    background: rgba(30, 26, 52, 0.75);
    border-color: rgba(99, 102, 241, 0.4);
}

.day-cell:active {
    transform: scale(0.96);
}

.day-cell.other-month {
    opacity: 0.24;
    background: rgba(10, 9, 18, 0.3);
}

.day-cell.today {
    border-color: var(--cal-primary) !important;
    background: rgba(99, 102, 241, 0.14);
}

.day-cell.today .day-number {
    background: var(--cal-primary);
    color: #ffffff;
    border-radius: 999px;
    width: 22px;
    height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 10px var(--cal-primary-glow);
}

@media (min-width: 640px) {
    .day-cell.today .day-number {
        width: 26px;
        height: 26px;
    }
}

/* Event Chips in Desktop Day Cells */
.day-event-chip {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 6px;
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 700;
    line-height: 1.3;
}

/* Mobile Day Cell Event Indicator Dots */
.day-dots-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    margin-top: auto;
    padding-top: 3px;
    flex-wrap: wrap;
}

.event-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 4px currentColor;
}

@media (max-width: 640px) {
    .day-event-chip {
        display: none !important;
    }
    .day-dots-container {
        display: flex;
    }
}

@media (min-width: 641px) {
    .day-dots-container {
        display: none;
    }
}

/* ==========================================================================
   🎯 EVENT MODE COLORS — ONLY ACTIVE WHEN EVENT MODE IS PRESSED
   ========================================================================== */
.day-cell.plan-green {
    background: rgba(16, 185, 129, 0.16) !important;
    border-color: rgba(16, 185, 129, 0.5) !important;
    box-shadow: inset 0 0 16px rgba(16, 185, 129, 0.08);
}
.day-cell.plan-green:hover {
    background: rgba(16, 185, 129, 0.28) !important;
    border-color: rgba(16, 185, 129, 0.7) !important;
}

.day-cell.plan-yellow {
    background: rgba(245, 158, 11, 0.16) !important;
    border-color: rgba(245, 158, 11, 0.5) !important;
    box-shadow: inset 0 0 16px rgba(245, 158, 11, 0.08);
}
.day-cell.plan-yellow:hover {
    background: rgba(245, 158, 11, 0.28) !important;
    border-color: rgba(245, 158, 11, 0.7) !important;
}

.day-cell.plan-red {
    background: rgba(239, 68, 68, 0.18) !important;
    border-color: rgba(239, 68, 68, 0.55) !important;
    box-shadow: inset 0 0 16px rgba(239, 68, 68, 0.1);
}
.day-cell.plan-red:hover {
    background: rgba(239, 68, 68, 0.3) !important;
    border-color: rgba(239, 68, 68, 0.75) !important;
}

/* Event Mode Status Pill on Day Cell */
.event-status-pill {
    font-size: 8px;
    font-weight: 900;
    line-height: 1;
    padding: 2px 4px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    gap: 2px;
}
@media (min-width: 640px) {
    .event-status-pill {
        font-size: 9px;
        padding: 2px 6px;
    }
}

/* Event Mode Active Header Button */
.btn-event-mode-active {
    background: linear-gradient(135deg, #a855f7 0%, #ec4899 100%) !important;
    color: #ffffff !important;
    border-color: rgba(255, 255, 255, 0.3) !important;
    box-shadow: 0 4px 16px rgba(236, 72, 153, 0.4) !important;
}

/* Drawer / Bottom Sheet */
#day-detail-drawer {
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: opacity 0.22s cubic-bezier(0.32, 0.72, 0, 1);
}

#drawer-panel {
    transform: translateY(100%);
    transition: transform 0.28s cubic-bezier(0.32, 0.72, 0, 1);
    will-change: transform;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

#day-detail-drawer.open #drawer-panel {
    transform: translateY(0);
}

@media (max-width: 640px) {
    #drawer-panel {
        border-bottom-left-radius: 0 !important;
        border-bottom-right-radius: 0 !important;
        max-height: 85vh !important;
        padding-bottom: max(24px, calc(16px + env(safe-area-inset-bottom, 16px))) !important;
    }
}

/* Touch & Scroll Optimizations */
.overflow-y-auto,
#drawer-events-list,
#agenda-list-container {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

button,
select,
.day-cell,
.cal-nav-btn {
    touch-action: manipulation;
}

/* Mobile Screen Adjustments (Ultra-compact screens ≤ 380px) */
@media (max-width: 380px) {
    .cal-weekday-header {
        font-size: 8.5px;
        padding: 3px 0;
    }
    .month-grid {
        gap: 2px !important;
    }
    .day-cell {
        min-height: 48px;
        padding: 3px 2px;
        border-radius: 10px;
    }
    .day-number {
        font-size: 10px;
    }
    .event-status-pill {
        font-size: 7.5px;
        padding: 1px 3px;
    }
    .event-dot {
        width: 5px;
        height: 5px;
    }
}

/* ==========================================================================
   CRASH-PROOF RESILIENT LAYOUT & SIZING GUARDS
   ========================================================================== */
.hidden,
#day-detail-drawer.hidden,
#drawer-conflict-banner.hidden,
[hidden] {
    display: none !important;
}