/* --- 1. General Resets & Typography --- */
:root {
    --primary: #2563EB;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --bg-body: #f8fafc;
    --surface: #ffffff;
}

body {
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--bg-body);
    color: #1e293b;
    scroll-behavior: smooth;
}

/* --- 2. Smooth Animations --- */
.fade-in {
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
    transform: translateY(10px);
}

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

/* --- 3. Efficient Button System --- */
.btn-master {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.btn-master:active {
    transform: scale(0.97);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3), 0 2px 4px -1px rgba(37, 99, 235, 0.1);
    color: white;
    border: none;
}

.btn-primary:hover {
    box-shadow: 0 8px 12px -3px rgba(37, 99, 235, 0.4);
    transform: translateY(-1px);
}

.btn-loading {
    opacity: 0.75;
    pointer-events: none;
    cursor: wait;
}

.spinner {
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 2px solid white;
    width: 16px;
    height: 16px;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
    display: inline-block;
}

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

/* --- 4. Sidebar Navigation --- */
.nav-item {
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
}

.nav-item.active {
    background-color: #EFF6FF; /* blue-50 */
    color: var(--primary);
    font-weight: 600;
    border-left: 3px solid var(--primary);
}

/* --- 5. Form Inputs --- */
input, select, textarea {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background-color: #fff;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
    outline: none;
}

/* --- 6. Table Viewing Efficiency --- */
.table-sticky-header th {
    position: sticky;
    top: 0;
    background-color: #f8fafc; /* Matches body bg */
    z-index: 5;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--secondary);
    letter-spacing: 0.05em;
}

.table-sticky-col {
    position: sticky;
    left: 0;
    background-color: inherit;
    z-index: 6;
    border-right: 1px solid #e2e8f0;
}

/* Zebra Striping & Hover */
.table-striped tbody tr:nth-child(even) { background-color: #f8fafc; }
.table-striped tbody tr:nth-child(odd) { background-color: #ffffff; }
.table-striped tbody tr:hover { 
    background-color: #eff6ff; 
    transition: background-color 0.15s ease; 
}

/* --- 7. Modal Glassmorphism --- */
#modal-overlay {
    background-color: rgba(15, 23, 42, 0.65); /* Dark Slate */
    backdrop-filter: blur(6px); /* The Glass Effect */
    z-index: 50; 
}

/* --- 8. Marksheet Specifics (Result Output) --- */
#mk-printable {
    background-color: white;
    position: relative;
    overflow: hidden;
    color: #1f2937;
}

/* Formal Header */
.mk-header {
    border-bottom: 2px solid #1f2937; /* Dark Gray */
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    text-align: center;
}

.mk-title {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Student Details Grid */
.mk-details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid #e5e7eb;
    padding: 1.5rem;
    border-radius: 0.5rem;
    background-color: #f9fafb;
}

.mk-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: #6b7280;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.mk-value {
    font-size: 1rem;
    font-weight: 600;
    color: #111827;
}

/* Marks Table */
.mk-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.mk-table th {
    background-color: #1f2937;
    color: white;
    text-transform: uppercase;
    font-size: 0.75rem;
    padding: 0.75rem;
    text-align: center;
    font-weight: 600;
}

.mk-table th:first-child { text-align: left; }

.mk-table td {
    padding: 0.75rem;
    border-bottom: 1px solid #e5e7eb;
    text-align: center;
    font-weight: 500;
}

.mk-table td:first-child { text-align: left; font-weight: 600; color: #374151; }

/* Grand Total Row */
.mk-table tfoot td {
    border-top: 2px solid #1f2937;
    font-weight: 800;
    padding-top: 1rem;
    font-size: 1rem;
    background-color: #f9fafb;
}

/* Footer Summary */
.mk-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px dashed #d1d5db;
}

/* Watermark */
.mk-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-45deg);
    font-size: 8rem;
    font-weight: 900;
    color: rgba(0,0,0,0.03);
    pointer-events: none;
    z-index: 0;
    white-space: nowrap;
}

/* Grade Badges */
.grade-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.8rem;
    min-width: 30px;
}
.grade-A { background: #dcfce7; color: #166534; } /* Green */
.grade-B { background: #dbeafe; color: #1e40af; } /* Blue */
.grade-C { background: #fef9c3; color: #854d0e; } /* Yellow */
.grade-D { background: #ffedd5; color: #9a3412; } /* Orange */
.grade-F { background: #fee2e2; color: #991b1b; } /* Red */

/* --- 9. Toast Notifications --- */
.toast-enter {
    animation: slideInRight 0.4s cubic-bezier(0.21, 1.02, 0.73, 1) forwards;
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* --- 10. Print Optimization --- */
@media print {
    @page { size: A4; margin: 0; }
    
    body { background: white; }
    
    /* Hide Interface */
    .no-print, 
    #view-admin, 
    #view-student, 
    #view-auth, 
    #view-landing, 
    #modal-overlay, 
    aside, 
    button, 
    #toast-container { 
        display: none !important; 
    }

    /* Show Marksheet */
    #view-marksheet { 
        display: block !important; 
        position: fixed; 
        top: 0; 
        left: 0; 
        width: 100%; 
        height: 100%; 
        margin: 0; 
        padding: 0 !important; 
        background: white !important; 
        overflow: visible;
        z-index: 9999;
    }

    /* Ensure Auto Height for Printing & Viewing */
    #mk-printable {
    height: auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
}
    
    /* Force Background Colors */
    * { 
        -webkit-print-color-adjust: exact !important; 
        print-color-adjust: exact !important; 
    }
}