/* ========================================
   ROOT VARIABLES
   ======================================== */

:root {
    /* Light theme */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --hover-bg: #f1f5f9;
    --event-academic: #3b82f6;
    --event-sport: #10b981;
    --event-cultural: #8b5cf6;
    --event-meeting: #f59e0b;
    --event-holiday: #ec4899;
    --event-exam: #ef4444;
    --today-bg: #eff6ff;
    --today-border: #3b82f6;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-primary: #60a5fa;
    --accent-secondary: #a78bfa;
    --border-color: #334155;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.3);
    --hover-bg: #2d3748;
    --event-academic: #3b82f6;
    --event-sport: #10b981;
    --event-cultural: #8b5cf6;
    --event-meeting: #f59e0b;
    --event-holiday: #ec4899;
    --event-exam: #ef4444;
    --today-bg: #1e3a8a;
    --today-border: #60a5fa;
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.2s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* ========================================
   LOADING ANIMATION
   ======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.calendar-loader {
    position: relative;
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    perspective: 200px;
}

.calendar-page {
    position: absolute;
    width: 80px;
    height: 80px;
    background: var(--gradient-1);
    border-radius: 10px;
    animation: flipCalendar 2s infinite;
    transform-origin: left;
}

.calendar-page:nth-child(1) { animation-delay: 0s; }
.calendar-page:nth-child(2) { animation-delay: 0.5s; opacity: 0.8; }
.calendar-page:nth-child(3) { animation-delay: 1s; opacity: 0.6; }

@keyframes flipCalendar {
    0%, 100% { transform: rotateY(0deg); }
    50% { transform: rotateY(180deg); }
}

.loading-text {
    color: var(--text-primary);
    font-size: 1rem;
    animation: pulse 2s infinite;
}

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

/* ========================================
   HEADER STYLES
   ======================================== */

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    animation: slideDown 0.5s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo i {
    font-size: 2.5rem;
    color: var(--accent-primary);
    animation: rotate 3s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo h1 {
    font-size: 2rem;
    font-weight: 600;
}

.logo h1 span {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-right {
    display: flex;
    gap: 10px;
}

.theme-toggle,
.refresh-btn {
    width: 45px;
    height: 45px;
    border: none;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover,
.refresh-btn:hover {
    transform: rotate(180deg);
    background: var(--accent-primary);
    color: white;
}

/* ========================================
   CALENDAR CONTROLS
   ======================================== */

.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
    animation: fadeInUp 0.6s ease;
}

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

.month-navigation {
    display: flex;
    align-items: center;
    gap: 15px;
    background: var(--bg-secondary);
    padding: 0.5rem;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
}

.nav-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: var(--accent-primary);
    color: white;
    transform: scale(1.1);
}

.month-year {
    min-width: 200px;
    text-align: center;
}

.month-year h2 {
    font-size: 1.3rem;
    font-weight: 500;
}

.today-btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 25px;
    background: var(--accent-primary);
    color: white;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.today-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
}

.view-options {
    display: flex;
    gap: 5px;
    background: var(--bg-secondary);
    padding: 0.5rem;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
}

.view-btn {
    padding: 0.5rem 1.2rem;
    border: none;
    border-radius: 25px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
}

.view-btn:hover {
    color: var(--accent-primary);
}

.view-btn.active {
    background: var(--accent-primary);
    color: white;
}

/* ========================================
   CALENDAR GRID
   ======================================== */

.calendar-container {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    animation: scaleIn 0.7s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    margin-bottom: 1rem;
    padding: 0.5rem;
}

.weekdays div {
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.5rem;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
}

.calendar-day {
    aspect-ratio: 1;
    padding: 0.5rem;
    background: var(--bg-primary);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    animation: fadeInDay 0.5s ease;
    animation-fill-mode: both;
    border: 2px solid transparent;
}

@keyframes fadeInDay {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.calendar-day:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

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

.calendar-day.other-month {
    opacity: 0.5;
}

.calendar-day.has-events {
    background: linear-gradient(135deg, var(--bg-primary), rgba(59, 130, 246, 0.1));
}

.day-number {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.event-indicators {
    display: flex;
    flex-wrap: wrap;
    gap: 3px;
}

.event-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.event-dot.academic { background: var(--event-academic); }
.event-dot.sport { background: var(--event-sport); }
.event-dot.cultural { background: var(--event-cultural); }
.event-dot.meeting { background: var(--event-meeting); }
.event-dot.holiday { background: var(--event-holiday); }
.event-dot.exam { background: var(--event-exam); }

/* ========================================
   UPCOMING EVENTS SIDEBAR
   ======================================== */

.upcoming-events {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.8s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.upcoming-header {
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.upcoming-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
}

.upcoming-header i {
    color: var(--accent-primary);
}

.upcoming-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.upcoming-event {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
    animation: slideInLeft 0.5s ease;
    animation-fill-mode: both;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.upcoming-event:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.event-date-badge {
    text-align: center;
    min-width: 60px;
}

.event-date-badge .day {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
}

.event-date-badge .month {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.event-info {
    flex: 1;
}

.event-info h4 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
}

.event-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.event-info i {
    font-size: 0.8rem;
    color: var(--accent-primary);
}

.event-category-badge {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-left: 0.5rem;
}

/* ========================================
   EVENTS LIST VIEW
   ======================================== */

.events-list-container {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    animation: fadeInUp 0.7s ease;
}

.events-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.events-list-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
}

.events-filter select {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
}

.events-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.list-event-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
    animation: fadeInRow 0.5s ease;
    animation-fill-mode: both;
}

@keyframes fadeInRow {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.list-event-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.list-event-date {
    text-align: center;
    min-width: 80px;
    padding: 0.5rem;
    background: var(--bg-secondary);
    border-radius: 10px;
}

.list-event-date .day {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
}

.list-event-date .month {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.list-event-info {
    flex: 1;
}

.list-event-info h4 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.list-event-meta {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.list-event-meta i {
    color: var(--accent-primary);
    margin-right: 3px;
}

.list-event-category {
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: white;
}

/* ========================================
   MODAL STYLES
   ======================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border-radius: 20px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.7);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-xl);
}

.modal-sm {
    max-width: 400px;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 10;
}

.modal-header h2 {
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-header i {
    color: var(--accent-primary);
}

.modal-close {
    width: 35px;
    height: 35px;
    border: none;
    border-radius: 50%;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-close:hover {
    transform: rotate(90deg);
    color: var(--accent-danger);
}

.modal-content {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
}

.modal-footer button {
    flex: 1;
    padding: 0.8rem;
    border: none;
    border-radius: 10px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.modal-footer .edit-btn {
    background: var(--accent-primary);
    color: white;
}

.modal-footer .delete-btn {
    background: var(--accent-danger);
    color: white;
}

.modal-footer button:hover {
    transform: translateY(-2px);
    filter: brightness(110%);
}

/* ========================================
   FORM STYLES
   ======================================== */

#eventForm {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

.form-group label i {
    color: var(--accent-primary);
    width: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.selected-date {
    padding: 0.8rem 1rem;
    background: var(--bg-primary);
    border-radius: 10px;
    color: var(--accent-primary);
    font-weight: 500;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin-right: 0;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.save-btn, .cancel-btn {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.save-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.cancel-btn {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.save-btn:hover, .cancel-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   EVENT DETAIL STYLES
   ======================================== */

.event-detail-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 10px;
    margin-bottom: 1rem;
}

.event-detail-item i {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    color: white;
    border-radius: 50%;
    font-size: 1rem;
}

.event-detail-item .detail-content {
    flex: 1;
}

.event-detail-item .detail-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
}

.event-detail-item .detail-value {
    font-weight: 500;
    color: var(--text-primary);
}

.event-category-badge-large {
    display: inline-block;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: white;
}

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 2000;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--accent-primary);
}

.toast.success {
    border-left-color: var(--accent-success);
}

.toast.error {
    border-left-color: var(--accent-danger);
}

.toast i {
    font-size: 1.2rem;
}

/* ========================================
   EMPTY STATE
   ======================================== */

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1rem;
}

/* ========================================
   SCROLLBAR
   ======================================== */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1200px) {
    .container {
        padding: 1rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
}

@media (max-width: 992px) {
    .calendar-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .month-navigation {
        justify-content: center;
    }
    
    .view-options {
        justify-content: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .calendar-day {
        padding: 0.3rem;
    }
    
    .day-number {
        font-size: 0.9rem;
    }
    
    .event-indicators {
        display: none;
    }
    
    .upcoming-event {
        flex-direction: column;
        text-align: center;
    }
    
    .list-event-item {
        flex-direction: column;
        text-align: center;
    }
    
    .list-event-meta {
        flex-direction: column;
        gap: 0.3rem;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 576px) {
    .weekdays div {
        font-size: 0.8rem;
    }
    
    .calendar-day {
        aspect-ratio: auto;
        min-height: 60px;
    }
    
    .month-navigation {
        flex-wrap: wrap;
    }
    
    .today-btn {
        width: 100%;
        justify-content: center;
    }
    
    .view-btn {
        padding: 0.5rem;
    }
    
    .view-btn span {
        display: none;
    }
}