/* Yearbook Redesign Styles - Global Glassmorphism & UX Improvements */
:root {
    --glass-surface: rgba(30, 41, 59, 0.7);
    --glass-surface-deep: rgba(15, 23, 42, 0.85);
    --glass-border: 1px solid rgba(255, 255, 255, 0.08);
    --accent-neon: #818cf8;
    --accent-neon-glow: 0 0 15px rgba(129, 140, 248, 0.4);
    --success-neon: #10b981;
    --danger-neon: #f43f5e;
    --font-primary: 'Pretendard', 'Inter', -apple-system, sans-serif;
    --font-display: 'Outfit', sans-serif;
}

/* 1. Glassmorphism Refinement */
.modal.glass,
.popover.glass,
.top-nav.glass,
.grid-container.glass,
.stats-sidebar.glass {
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    background: var(--glass-surface);
    border: var(--glass-border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-radius: 20px;
}

/* 2. Layout Framework for Modals */
.modal-content-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 24px;
    height: 100%;
}

.modal-main-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.modal-side-column {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* 3. Typography & Hierarchy */
.modal-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.modal-title-group .subject-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-neon);
}

.modal h3 {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.5px;
}

/* 4. Input & Form Enhancements */
.form-input-dark,
.form-textarea-dark {
    background: rgba(0, 0, 0, 0.3) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    border-radius: 12px !important;
    color: #f8fafc !important;
    transition: all 0.3s ease !important;
    padding: 12px 16px !important;
}

.form-input-dark:focus,
.form-textarea-dark:focus {
    border-color: var(--accent-neon) !important;
    box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.15) !important;
    background: rgba(0, 0, 0, 0.4) !important;
    outline: none;
}

.form-label-sm {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: #94a3b8;
    margin-bottom: 6px;
    margin-left: 4px;
}

/* 5. Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg,
            rgba(255, 255, 255, 0.03) 25%,
            rgba(255, 255, 255, 0.08) 50%,
            rgba(255, 255, 255, 0.03) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 8px;
}

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

    100% {
        background-position: -200% 0;
    }
}

/* 6. Toast Notifications */
#toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 14px 24px;
    border-radius: 14px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    animation: toast-slide-in 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.success i {
    color: var(--success-neon);
}

.toast.error i {
    color: var(--danger-neon);
}

.toast.info i {
    color: var(--accent-neon);
}

@keyframes toast-slide-in {
    from {
        transform: translateX(100%) scale(0.9);
        opacity: 0;
    }

    to {
        transform: translateX(0) scale(1);
        opacity: 1;
    }
}

.toast.fade-out {
    animation: toast-fade-out 0.4s forwards;
}

@keyframes toast-fade-out {
    to {
        transform: translateX(50%) scale(0.9);
        opacity: 0;
    }
}

/* 7. Empty State Illustration Style */
.empty-state-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px;
    text-align: center;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 20px;
    border: 1px dashed rgba(255, 255, 255, 0.1);
    margin: 20px;
}

.empty-state-icon {
    font-size: 3rem;
    color: var(--accent-neon);
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state-text h4 {
    font-weight: 700;
    margin-bottom: 8px;
}

.empty-state-text p {
    font-size: 0.9rem;
    color: var(--text-dim);
}

/* 8. Micro-interactions */
.nav-btn,
.publish-btn,
.chip-btn {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.nav-btn:active,
.publish-btn:active {
    transform: scale(0.95) !important;
}

.cell-subject:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Advanced Card Layout for Detail Modal Info Panel */
.info-card {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px;
    transition: background 0.3s;
}

.info-card:hover {
    background: rgba(0, 0, 0, 0.3);
}

.info-item-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.info-item-value {
    font-size: 0.95rem;
    font-weight: 600;
}

/* Custom Scrollbar */
.scrollable::-webkit-scrollbar {
    width: 4px;
}

.scrollable::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 10px;
}

.scrollable::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}