/* ===================================
   REUSABLE COMPONENTS
   =================================== */

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-size: var(--text-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    font-family: var(--font-primary);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-ghost:hover {
    background: var(--gray-100);
    border-color: var(--gray-400);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--text-lg);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--text-sm);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.btn-icon-sm {
    width: 28px;
    height: 28px;
    font-size: 12px;
}

.btn-error {
    background: var(--error);
    color: var(--white);
}

.btn-error.btn-ghost {
    background: transparent;
    color: var(--error);
    border-color: rgba(239, 68, 68, 0.2);
}

.btn-error.btn-ghost:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--error);
}

/* CARDS */
.card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--gray-200);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-gradient {
    background: var(--gradient-card);
}

.card-compact {
    padding: var(--space-lg);
}

.card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-sm);
}

.card-subtitle {
    font-size: var(--text-sm);
    color: var(--gray-500);
    margin-bottom: var(--space-md);
}

/* INPUTS */
.input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: var(--text-base);
    font-family: var(--font-primary);
    color: var(--gray-800);
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    outline: none;
}

.input:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(91, 141, 238, 0.1);
}

.input::placeholder {
    color: var(--gray-400);
}

.textarea {
    min-height: 120px;
    resize: vertical;
}

.input-group {
    margin-bottom: var(--space-lg);
}

.input-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-sm);
}

/* BADGES */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--gray-200);
    color: var(--gray-700);
}

.badge-primary {
    background: rgba(91, 141, 238, 0.1);
    color: var(--primary-blue);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.badge-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

/* PROGRESS BARS */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-lg {
    height: 12px;
}

/* DIVIDERS */
.divider {
    height: 1px;
    background: var(--gray-200);
    margin: var(--space-xl) 0;
}

/* NAVIGATION BAR */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--white);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-lg) 0;
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-logo {
    font-size: var(--text-2xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
}

.navbar-link {
    color: var(--gray-700);
    font-weight: 500;
    transition: color var(--transition-base);
}

.navbar-link:hover {
    color: var(--primary-blue);
}

.navbar-link.active {
    color: var(--primary-blue);
    font-weight: 600;
}

[data-theme="dark"] .navbar {
    background: rgba(26, 32, 44, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}



/* FOOTER */
.footer {
    background: var(--gray-50);
    color: var(--gray-600);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: var(--space-4xl);
    border-top: 1px solid var(--gray-200);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-column h4 {
    color: var(--white);
    font-size: var(--text-lg);
    margin-bottom: var(--space-lg);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--gray-400);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--space-lg);
    text-align: center;
    color: var(--gray-500);
    font-size: var(--text-sm);
}

/* ICONS */
.icon {
    width: 24px;
    height: 24px;
    display: inline-block;
}

.icon-lg {
    width: 48px;
    height: 48px;
}

.icon-xl {
    width: 64px;
    height: 64px;
}

/* FEATURE CARD */
.feature-card {
    text-align: center;
    padding: var(--space-2xl);
    background: var(--white);
    border-radius: var(--radius-xl);
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary-blue);
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-3xl);
}

.feature-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-sm);
}

.feature-description {
    color: var(--gray-600);
    font-size: var(--text-base);
}

/* CALENDAR COMPONENTS */
.calendar-page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-2xl);
    gap: var(--space-xl);
}

.calendar-filters {
    display: flex;
    gap: var(--space-md);
}

.filter-select {
    padding: 0.625rem 1rem;
    font-size: var(--text-sm);
    font-family: var(--font-primary);
    color: var(--gray-700);
    background: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
    min-width: 160px;
}

.filter-select:hover {
    border-color: var(--primary-blue);
}

.filter-select:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(91, 141, 238, 0.1);
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-xl);
    border-bottom: 2px solid var(--gray-200);
    background: var(--gradient-subtle);
}

.calendar-month-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
}

.calendar-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--gray-700);
}

.calendar-nav-btn:hover {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: var(--white);
    transform: scale(1.05);
}

.calendar-container {
    padding: var(--space-xl);
}

.calendar-day-headers {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    margin-bottom: var(--space-md);
}

.calendar-day-header {
    text-align: center;
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--gray-600);
    padding: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--gray-200);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.calendar-day {
    background: var(--white);
    min-height: 120px;
    padding: var(--space-sm);
    position: relative;
    transition: all var(--transition-base);
    cursor: pointer;
}

.calendar-day:hover {
    background: var(--gray-50);
}

.calendar-day.other-month {
    background: var(--gray-100);
    opacity: 0.5;
}

.calendar-day.today {
    background: rgba(91, 141, 238, 0.05);
    border: 2px solid var(--primary-blue);
}

.calendar-day-number {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-xs);
}

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

.calendar-events {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.calendar-event {
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    border-left: 3px solid;
}

.calendar-event:hover {
    transform: translateX(2px);
    box-shadow: var(--shadow-sm);
}

.calendar-event.event-deadline {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border-color: var(--error);
}

.calendar-event.event-essay {
    background: rgba(91, 141, 238, 0.1);
    color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.calendar-event.event-task {
    background: rgba(139, 123, 247, 0.1);
    color: var(--primary-purple);
    border-color: var(--primary-purple);
}

.calendar-event-more {
    font-size: 10px;
    color: var(--gray-500);
    font-weight: 600;
    padding: 2px 6px;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.calendar-event-more:hover {
    color: var(--primary-blue);
}

.calendar-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
    padding: var(--space-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--gray-700);
    font-weight: 500;
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    display: inline-block;
}

/* EVENT MODAL */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    /* backdrop-filter: blur(x); removed per user request to avoid haze on calendar */
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.modal-content {
    position: relative;
    z-index: 20;
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl);
    border-bottom: 2px solid var(--gray-200);
}

.modal-header h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-3xl);
    color: var(--gray-500);
    cursor: pointer;
    transition: all var(--transition-base);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.modal-body {
    padding: var(--space-xl);
    overflow-y: auto;
    max-height: calc(80vh - 80px);
}

.event-detail-row {
    margin-bottom: var(--space-lg);
}

.event-detail-label {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--gray-600);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.event-detail-value {
    font-size: var(--text-base);
    color: var(--gray-800);
}

.event-type-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
}

/* MOBILE MENU */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--gray-700);
}

@media (max-width: 768px) {
    .navbar-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        gap: var(--space-md);
    }

    .navbar-links.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Calendar responsive */
    .calendar-page-header {
        flex-direction: column;
        align-items: stretch;
    }

    .calendar-filters {
        flex-direction: column;
    }

    .filter-select {
        width: 100%;
    }

    .calendar-day {
        min-height: 80px;
        padding: 4px;
    }

    .calendar-day-number {
        font-size: 11px;
    }

    .calendar-event {
        font-size: 9px;
        padding: 2px 4px;
    }

    .calendar-legend {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--space-lg);
    transition: opacity 0.4s ease;
    opacity: 0;
}

.loading-overlay.active {
    display: flex;
    opacity: 1;
}

.loading-logo {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-sm);
    animation: pulse 2s ease-in-out infinite;
}

.loading-bars {
    display: flex;
    gap: 4px;
}

.loading-bar {
    width: 4px;
    height: 16px;
    background: var(--primary-blue);
    border-radius: var(--radius-full);
    animation: loading-bar 1.2s ease-in-out infinite;
}

.loading-bar:nth-child(2) {
    animation-delay: 0.1s;
    background: #6B9AEE;
}

.loading-bar:nth-child(3) {
    animation-delay: 0.2s;
    background: #7B8AEE;
}

.loading-bar:nth-child(4) {
    animation-delay: 0.3s;
    background: var(--primary-purple);
}

@keyframes loading-bar {

    0%,
    100% {
        height: 16px;
        transform: scaleY(1);
    }

    50% {
        height: 32px;
        transform: scaleY(1.2);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.7;
        transform: scale(0.98);
    }
}

/* Base Spinner (existing) */
.loading-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
    margin-right: var(--space-xs);
    vertical-align: middle;
}

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

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}