/* ============================================
   CSE 63B Portal — Main Stylesheet
   ============================================ */

:root {
    --primary-blue: #2563eb;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f7f7f7;
}

.section-padding {
    padding: 3rem 1rem;
}

@media (min-width: 640px) {
    .section-padding {
        padding: 4rem 2rem;
    }
}

/* ============================================
   Progress Bar
   ============================================ */

#progress-bar {
    position: fixed;
    top: 64px;
    left: 0;
    height: 3px;
    background: linear-gradient(to right, #2563eb, #7c3aed);
    width: 0%;
    transition: width 0.1s ease;
    z-index: 40;
}

/* ============================================
   Navigation
   ============================================ */

.nav-link.active {
    color: #2563eb;
    font-weight: 600;
    border-bottom: 2px solid #2563eb;
}

#mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

#mobile-menu.open {
    max-height: 500px;
}

/* ============================================
   Schedule Table
   ============================================ */

.schedule-table {
    border-collapse: separate;
    border-spacing: 0 12px;
}

/* ============================================
   Countdown
   ============================================ */

.countdown-box {
    min-width: 45px;
}

.countdown-urgent-red .countdown-box {
    background-color: #fee2e2;
}

.countdown-urgent-red .text-xl {
    color: #dc2626;
}

.countdown-urgent-orange .countdown-box {
    background-color: #fed7aa;
}

.countdown-urgent-orange .text-xl {
    color: #ea580c;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-animate {
    animation: fadeIn 0.2s ease-out;
}

.modal-content-animate {
    animation: slideUp 0.3s ease-out;
}

/* ============================================
   Dropdowns
   ============================================ */

.dropdown-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.dropdown-content.open {
    max-height: 2000px;
}

/* ============================================
   Custom Scrollbar
   ============================================ */

.custom-scrollbar::-webkit-scrollbar {
    width: 8px;
}

.custom-scrollbar::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 10px;
}

/* ============================================
   Calendar
   ============================================ */

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.calendar-day:hover {
    background-color: #dbeafe;
}

.calendar-day.has-event {
    background-color: #2563eb;
    color: white;
    font-weight: 600;
}

.calendar-day.has-event:hover {
    background-color: #1d4ed8;
}

.calendar-day.today {
    border: 3px solid #2563eb;
    font-weight: bold;
}

.calendar-day.today.has-event {
    border: 3px solid #fbbf24;
}

.calendar-day.today.has-event-purple {
    border: 3px solid #fbbf24;
}

.calendar-day.today.has-event-gradient {
    border: 3px solid #fbbf24;
}

.calendar-day.weekend-day {
    color: #dc2626 !important;
    font-weight: 600;
}

.calendar-day.weekend-day:hover {
    background-color: #fee2e2;
}

.calendar-day.has-event-purple {
    background-color: #9333ea;
    color: white;
    font-weight: 600;
}

.calendar-day.has-event-purple:hover {
    background-color: #7c3aed;
}

.calendar-day.has-event-red {
    background-color: #dc2626;
    color: white;
    font-weight: 600;
}

.calendar-day.has-event-red:hover {
    background-color: #b91c1c;
}

.calendar-day.has-event-gradient {
    background: linear-gradient(135deg, #2563eb, #9333ea);
    color: white;
    font-weight: 600;
}

.calendar-day.has-event-gradient:hover {
    background: linear-gradient(135deg, #1d4ed8, #7c3aed);
}

/* ============================================
   Tooltip
   ============================================ */

.tooltip {
    position: absolute;
    z-index: 1000;
    background: white;
    border: 2px solid #2563eb;
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    max-width: 250px;
    display: none;
}

.tooltip.show {
    display: block;
}

/* ============================================
   Skeleton Loading
   ============================================ */

.skeleton {
    background: linear-gradient(
        90deg, 
        #e0e7ff 0%, 
        #c7d2fe 50%, 
        #e0e7ff 100%
    );
    background-size: 200% 100%;
    animation: loading 1.5s infinite ease-in-out;
    border-radius: 12px;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================
   Badges
   ============================================ */

.new-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ef4444;
    color: white;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 9999px;
    font-weight: bold;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================
   Mobile Touch Targets
   ============================================ */

@media (max-width: 768px) {
    button, a {
        min-height: 44px;
        min-width: 44px;
    }
}

/* ============================================
   Scroll Indicator
   ============================================ */

.scroll-indicator {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(-50%) translateX(0); }
    50% { transform: translateY(-50%) translateX(10px); }
}

.swipe-indicator {
    width: 40px;
    height: 4px;
    background: #d1d5db;
    border-radius: 2px;
    margin: 0 auto 16px;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    nav, button, .modal, #progress-bar {
        display: none !important;
    }
    
    .section-padding {
        page-break-inside: avoid;
    }
    
    body {
        background: white;
    }
}

/* ============================================
   Breadcrumbs
   ============================================ */

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #6b7280;
    font-size: 14px;
    margin-bottom: 16px;
}

.breadcrumb-separator {
    color: #d1d5db;
}

/* ============================================
   Floating Action Button
   ============================================ */

.fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    background: #2563eb;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.6);
}

.fab.admin-fab {
    opacity: 1 !important;
    pointer-events: auto !important;
}

/* ============================================
   Custom Loader
   ============================================ */

.custom-loader {
    height: 60px;
    aspect-ratio: 2;
    border-bottom: 3px solid #0000;
    background: 
        linear-gradient(90deg, #2563eb 50%, #0000 0)
        -25% 100%/50% 3px repeat-x border-box;
    position: relative;
    animation: loader-track .75s linear infinite;
}

.custom-loader:before {
    content: "";
    position: absolute;
    inset: auto 42.5% 0;
    aspect-ratio: 1;
    border-radius: 50%;
    background: #7c3aed;
    animation: loader-bounce .75s cubic-bezier(0,900,1,900) infinite;
}

@keyframes loader-track {
    to {background-position: -125% 100%}
}

@keyframes loader-bounce {
    0%, 2% {bottom: 0%}
    98%, to {bottom: 0.1%}
}

/* ============================================
   Loading Overlay
   ============================================ */

#loading-overlay {
    backdrop-filter: blur(8px);
    background: rgba(255, 255, 255, 0.9);
}

/* ============================================
   Toast Notification
   ============================================ */

.toast-slide-up {
    animation: slideUp 0.3s ease-out;
}

/* ============================================
   Swipe Affordance (Task 8)
   ============================================ */

.swipe-text {
    display: none;
    text-align: center;
    font-size: 11px;
    color: #9ca3af;
    margin: -12px 0 8px;
    pointer-events: none;
}

@media (pointer: coarse) {
    .swipe-text {
        display: block;
    }
}

/* ============================================
   Dark Mode Icon Toggle (Task 10)
   ============================================ */

.dark .dark-icon {
    display: none !important;
}

.dark .light-icon {
    display: inline-block !important;
}

/* ============================================
   Update Banner (Task 5)
   ============================================ */

@keyframes slideDown {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

.update-banner-slide {
    animation: slideDown 0.4s ease-out;
}

/* ============================================
   Dark Mode Overrides
   ============================================ */

.dark .tooltip {
    background: #1f2937;
    border-color: #3b82f6;
    color: #e5e7eb;
}

.dark .custom-scrollbar::-webkit-scrollbar-track {
    background: #374151;
}

.dark .custom-scrollbar::-webkit-scrollbar-thumb {
    background: #6b7280;
}

.dark .skeleton {
    background: linear-gradient(90deg, #374151 0%, #4b5563 50%, #374151 100%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite ease-in-out;
}

.dark #loading-overlay {
    background: rgba(17, 24, 39, 0.9);
}

.dark .swipe-indicator {
    background: #4b5563;
}

.dark .breadcrumb {
    color: #9ca3af;
}

.dark .breadcrumb-separator {
    color: #4b5563;
}