:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #E0E7FF;
    --secondary-text: #3730A3;
    --danger: #EF4444;
    --success: #10B981;
    --bg: #F3F4F6;
    --card-bg: #FFFFFF;
    --text: #1F2937;
    --border: #D1D5DB;
    --radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --accent-start: #7C3AED;
    --accent-end: #2563EB;
    --muted: #6B7280;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    background:
        radial-gradient(1200px 600px at 10% 0%, rgba(124, 58, 237, 0.08), transparent 60%),
        radial-gradient(1200px 600px at 90% 100%, rgba(37, 99, 235, 0.08), transparent 60%),
        var(--bg);
    color: var(--text);
    margin: 0;
    padding: 20px;
    line-height: 1.5;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    color: #fff;
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.25);
    position: relative;
}

header h1 {
    color: #fff;
    margin: 0;
}

.collection-page .header-main {
    flex: 1;
    min-width: 0;
}

.collection-page .header-title-row {
    margin-bottom: 6px;
    text-align: left;
}

.collection-page .header-subline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-width: 0;
    white-space: nowrap;
}

.collection-page .header-company {
    margin: 0;
    color: #eef2ff;
    text-align: left;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

.collection-page .header-contact {
    display: inline-flex;
    align-items: center;
    font-size: 1rem;
    line-height: 1.2;
    color: #eef2ff;
    background: rgba(15, 23, 42, 0.22);
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 999px;
    padding: 7px 12px;
    flex-shrink: 0;
    white-space: nowrap;
}

.collection-page .header-contact-phone {
    margin-left: 20px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
}

.collection-page .header-contact-phone:hover,
.collection-page .header-contact-phone:focus-visible {
    text-decoration: none;
    color: #dbeafe;
}

.empty-state {
    color: var(--muted);
}

.student-entry {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    position: relative;
    transition: transform 0.2s;
}

.student-entry:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.12);
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
}

.btn-delete {
    background: none;
    border: none;
    color: var(--danger);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 10px;
    border-radius: 4px;
}

.btn-delete:hover {
    background: #FEE2E2;
}

.form-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: flex-end;
}

.form-group {
    display: flex;
    flex-direction: column;
    flex: none;
    position: relative;
}

.form-row {
    display: flex;
    gap: 8px;
    width: 100%;
    flex-wrap: nowrap;
    align-items: flex-end;
}

.form-row .form-group {
    flex-shrink: 0;
}

.w-xs { width: 9%; }
.w-sm { width: 10%; }
.w-md { width: 20%; }
.w-lg { width: 30%; }
.w-xl { width: 20%; }
.w-1-5 { width: 20%; }
.w-2-5 { width: 30%; }
.w-1-4 { width: 22%; }
.w-1-3 { width: 30%; }
.w-2-3 { width: 40%; }
.w-full { width: 100%; }
.w-upload { width: 135px; }

.form-group.full-width {
    width: 100%;
}

.form-section {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px dashed var(--border);
}

.form-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.section-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
    padding-left: 10px;
    border-left: 3px solid var(--primary);
}

.upload-grid {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    align-items: flex-end;
    overflow-x: auto;
    padding-bottom: 5px;
}

.upload-grid .form-group {
    flex-shrink: 0;
}

.upload-box {
    width: 100%;
    height: 120px;
    border: 2px dashed var(--border);
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    background-color: #f9fafb;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-box:hover {
    border-color: var(--primary);
    background-color: #f0fdf4;
}

.upload-box input[type="file"] {
    display: none;
}

.upload-placeholder {
    text-align: center;
    color: #9ca3af;
    pointer-events: none;
}

.upload-placeholder .icon {
    font-size: 24px;
    display: block;
    line-height: 1;
}

.upload-placeholder .text {
    font-size: 10px;
    display: block;
    margin-top: 2px;
}

.preview-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 2;
}

label {
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 2px;
    color: #4B5563;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

input, select {
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.9rem;
    transition: border-color 0.2s;
    width: 100%;
    box-sizing: border-box;
    height: 34px;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

input.error, select.error {
    border-color: var(--danger);
    background-color: #FEF2F2;
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}

.error-message {
    color: var(--danger);
    font-size: 0.75rem;
    margin-top: 4px;
    display: block;
}

.hint-slot {
    position: absolute;
    top: 100%;
    left: 0;
    transform: translateY(4px);
    display: none;
}

.error-pop {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 0;
    background: linear-gradient(135deg, #FEF2F2 0%, #FEE2E2 100%);
    color: #DC2626;
    border: 1px solid #FECACA;
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.8rem;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.15), 0 2px 4px rgba(0, 0, 0, 0.05);
    z-index: 100;
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    animation: errorPopIn 0.3s ease forwards;
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.error-pop::before {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 16px;
    width: 12px;
    height: 12px;
    background: linear-gradient(135deg, #FEE2E2 0%, #FEF2F2 100%);
    border-right: 1px solid #FECACA;
    border-bottom: 1px solid #FECACA;
    transform: rotate(45deg);
}

.error-pop::after {
    content: '⚠';
    margin-right: 6px;
    font-size: 0.9rem;
}

@keyframes errorPopIn {
    0% {
        opacity: 0;
        transform: translateY(4px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes errorPopOut {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(4px);
    }
}

.error-pop.hiding {
    animation: errorPopOut 0.2s ease forwards;
}

.error-pop.wide {
    white-space: normal;
    max-width: 300px;
}

.form-group.has-error {
    position: relative;
}

.form-group.has-error label {
    color: var(--danger);
}

.upload-box.has-error {
    border-color: var(--danger);
    background-color: #FEF2F2;
    animation: shake 0.4s ease-in-out;
}

.upload-box.has-error .upload-placeholder {
    color: var(--danger);
}

.file-uploads {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px dashed var(--border);
}

.upload-item {
    font-size: 0.85rem;
}

.actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.btn {
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
    font-size: 1rem;
}

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

.btn.primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.35), 0 6px 10px rgba(79, 70, 229, 0.25);
}

.btn.secondary {
    background-color: var(--secondary);
    color: var(--secondary-text);
}

.btn.secondary:hover {
    background-color: #C7D2FE;
    transform: translateY(-1px);
}

::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f1f1; 
}
::-webkit-scrollbar-thumb {
    background: #c1c1c1; 
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8; 
}

/* Admin Layout */
body.admin-page { padding: 0; overflow: hidden; height: 100vh; }

.admin-layout {
    display: flex;
    height: 100%;
}

.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 1000;
    background: var(--secondary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    justify-content: center;
    align-items: center;
}

.admin-logout-btn {
    position: fixed;
    top: 12px;
    right: 12px;
    z-index: 1001;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 64px;
    height: 36px;
    padding: 0 12px;
    border-radius: 10px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    color: #1d4ed8;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
    transition: all 0.2s ease;
}

.admin-logout-btn:hover {
    background: #eff6ff;
    border-color: #93c5fd;
}

.admin-logout-btn:active {
    transform: translateY(1px);
}

.sidebar {
    width: 300px;
    background: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 20px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
    height: 100vh;
    overflow: hidden;
}

.sidebar-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
    color: #fff;
    position: relative;
    overflow: hidden;
}

.sidebar-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 3s infinite linear;
}

@keyframes shimmer {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.search-box {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.85rem;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.search-box:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
    transform: translateY(-1px);
}

.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    gap: 8px;
    padding: 12px;
    background: #F9FAFB;
}

.tab {
    flex: 1;
    padding: 12px 16px;
    text-align: center;
    cursor: pointer;
    background: #EEF2FF;
    color: var(--secondary-text);
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.6s ease;
}

.tab:hover::before {
    left: 100%;
}

.tab.active {
    background: var(--secondary);
    font-weight: 700;
    color: var(--text);
    box-shadow: 0 6px 20px rgba(79,70,229,0.2);
    transform: translateY(-1px);
}

.student-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    min-height: 0;
}

.list-item {
    padding: 10px 12px;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 6px;
    margin: 2px;
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: relative;
    overflow: hidden;
}

.list-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent-start), var(--accent-end));
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.3s ease;
}

.list-item:hover {
    background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(37,99,235,0.08));
    color: var(--secondary-text);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.list-item:hover::before {
    transform: scaleY(1);
}

.list-item.active {
    background: linear-gradient(135deg, rgba(124,58,237,0.12), rgba(37,99,235,0.12));
    box-shadow: 0 8px 24px rgba(79,70,229,0.15);
}

.list-item.active::before {
    transform: scaleY(1);
}

.list-item h4 { 
    margin: 0 0 4px 0; 
    font-size: 0.9rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.list-rejected-tag {
    display: inline-flex;
    align-items: center;
    padding: 1px 7px;
    border-radius: 999px;
    font-size: 0.68rem;
    line-height: 1.4;
    color: #991b1b;
    background: #fee2e2;
    border: 1px solid #fecaca;
    font-weight: 600;
    white-space: nowrap;
}

.list-item .student-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
    margin-top: 4px;
}

.list-item .info-item {
    font-size: 0.7rem;
    color: #666;
    display: flex;
    align-items: center;
    gap: 2px;
}

.list-item .info-item::before {
    content: '•';
    font-size: 0.6rem;
    color: var(--secondary);
}

.main-content {
    flex: 1;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 30px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.detail-card {
    background: white;
    padding: 36px;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    border: 1px solid rgba(209,213,219,0.6);
    position: relative;
    animation: fadeInUp 0.6s ease-out;
}

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

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

.detail-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
}

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 36px;
    border-bottom: 1px solid #eee;
    padding-bottom: 24px;
}

.detail-header h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.detail-header .student-id {
    font-size: 0.9rem;
    color: #666;
    margin-top: 4px;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 36px;
}

.detail-item {
    position: relative;
    transition: all 0.3s ease;
}

.detail-item:hover {
    transform: translateY(-2px);
}

.detail-item label {
    display: block;
    color: #666;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-item span {
    display: block;
    font-weight: 500;
    font-size: 1rem;
    color: var(--text);
    background: #f9fafb;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
}

.detail-item span:hover {
    background: #f3f4f6;
    border-color: var(--secondary);
    box-shadow: 0 4px 12px rgba(79,70,229,0.1);
}

.files-section {
    margin-top: 36px;
}

.files-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

.file-thumbs {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.file-thumb {
    width: 120px;
    height: 120px;
    border: 1px solid #ddd;
    border-radius: 12px;
    object-fit: cover;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.file-thumb::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(124,58,237,0.1));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.file-thumb:hover {
    transform: scale(1.05) rotate(2deg);
    box-shadow: 0 12px 24px rgba(0,0,0,0.18);
    border-color: var(--secondary);
}

.file-thumb:hover::before {
    opacity: 1;
}

.action-bar {
    margin-top: 36px;
    display: flex;
    justify-content: flex-end;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid #eee;
}

.empty-state {
    text-align: center;
    color: #999;
    margin-top: 120px;
    padding: 60px 40px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.empty-state h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
}

.empty-state p {
    font-size: 1rem;
    color: #666;
    margin-bottom: 24px;
}

.filter-controls {
    padding: 16px;
    border-bottom: 1px solid #eee;
    background: #f9fafb;
}

.filter-controls h4 {
    margin: 0 0 12px 0;
    font-size: 0.9rem;
    color: #666;
    font-weight: 600;
}

.filter-controls select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.85rem;
    background: white;
    transition: all 0.3s ease;
}

.filter-controls select:focus {
    outline: none;
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.filter-controls button {
    padding: 8px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: white;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-controls button:hover {
    background: var(--secondary);
    color: white;
    border-color: var(--secondary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79,70,229,0.2);
}

.batch-controls {
    padding: 8px 12px;
    border-bottom: 1px solid #eee;
    background: #f9fafb;
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    white-space: nowrap;
}

.batch-controls input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--secondary);
}

.batch-controls label {
    font-size: 0.85rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text);
}

.batch-controls button {
    padding: 6px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.batch-controls button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.3s ease;
}

.batch-controls button:hover::before {
    left: 100%;
}

.batch-controls button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.status-badge {
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.status-badge.unreviewed {
    background: #fef3c7;
    color: #92400e;
}

.status-badge.reviewed {
    background: #dcfce7;
    color: #166534;
}

.badge.unreviewed {
    background: #FEF3C7;
    color: #B45309;
    border: 1px solid #F59E0B;
}

.badge.reviewed {
    background: #DCFCE7;
    color: #065F46;
    border: 1px solid #10B981;
}

.badge.rejected {
    background: #FEE2E2;
    color: #991B1B;
    border: 1px solid #EF4444;
}

@media (max-width: 900px) {
    body {
        padding: 14px;
    }

    .container {
        max-width: 100%;
    }

    .collection-page .form-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
        align-items: start;
    }

    .collection-page .form-row {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
    }

    .collection-page .w-xs,
    .collection-page .w-sm,
    .collection-page .w-md,
    .collection-page .w-lg,
    .collection-page .w-xl,
    .collection-page .w-1-5,
    .collection-page .w-2-5,
    .collection-page .w-1-4,
    .collection-page .w-1-3,
    .collection-page .w-2-3 {
        width: 100%;
    }

    .collection-page .upload-grid {
        flex-wrap: wrap;
        overflow-x: visible;
        gap: 10px;
    }

    .collection-page .w-upload {
        width: calc(50% - 6px);
    }

    .collection-page .actions {
        position: sticky;
        bottom: 0;
        z-index: 20;
        background: rgba(243, 244, 246, 0.94);
        backdrop-filter: blur(8px);
        margin-top: 18px;
        padding-top: 10px;
        padding-bottom: 8px;
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .admin-logout-btn {
        top: 10px;
        right: 10px;
        height: 34px;
        min-width: 58px;
        border-radius: 9px;
        font-size: 12px;
        padding: 0 10px;
    }

    .collection-page .header-brand {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 10px !important;
    }

    .collection-page .header-logo {
        height: 56px !important;
        width: auto;
    }

    .collection-page .header-main {
        width: 100%;
    }

    .collection-page .header-subline {
        gap: 8px;
    }

    .collection-page .header-company {
        font-size: 0.82rem;
    }

    .collection-page .header-contact {
        font-size: 0.86rem;
        padding: 6px 10px;
    }

    .collection-page header {
        padding: 16px;
        margin-bottom: 18px;
    }

    .collection-page .student-entry {
        padding: 14px;
    }

    .collection-page .entry-header {
        margin-bottom: 12px;
    }

    .collection-page .form-grid,
    .collection-page .form-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .collection-page .upload-grid {
        gap: 10px;
    }

    .collection-page .w-upload {
        width: 100%;
    }

    .collection-page .upload-box {
        height: 118px;
    }

    .collection-page .actions {
        display: grid;
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .admin-layout {
        flex-direction: row;
        overflow: hidden;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        height: 100vh;
        border-right: 1px solid var(--border);
        border-bottom: none;
        transform: translateX(-100%);
        z-index: 999;
        box-shadow: 10px 0 30px rgba(15, 23, 42, 0.2);
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .sidebar.mobile-open ~ .main-content::before {
        content: '';
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.35);
        z-index: 998;
    }

    .sidebar-title-row {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 8px !important;
    }

    #searchInput {
        width: 100% !important;
    }

    .toggle-section > div {
        display: grid !important;
        grid-template-columns: 1fr 1fr;
        gap: 8px !important;
    }

    .sidebar-filters .filter-row {
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 8px !important;
    }

    #resetFilters,
    #exportExcelBtn {
        width: 100%;
    }
    
    .student-list {
        max-height: 60vh;
    }
    
    .main-content {
        flex: 1;
        width: 100%;
        padding: 64px 12px 16px;
        min-height: 100vh;
        height: auto;
    }
    
    .detail-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .detail-card {
        padding: 16px;
        max-width: 100%;
    }
    
    .detail-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .detail-header .student-id {
        word-break: break-all;
    }

    .action-bar {
        justify-content: stretch;
        flex-wrap: wrap;
        gap: 10px;
    }

    .action-bar .btn {
        flex: 1;
        min-width: 120px;
    }

    .file-thumbs {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 8px;
    }

    .file-item-wrapper {
        flex: 0 0 auto;
    }
    
    .filter-controls {
        padding: 10px;
    }
    
    .tabs {
        padding: 8px;
    }
    
    .tab {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
    
    button {
        min-height: 44px;
        min-width: 44px;
    }
    
    .error-pop {
        font-size: 0.75rem;
        padding: 6px 10px;
        max-width: 200px;
        white-space: normal;
    }
    
    .error-pop::after {
        font-size: 0.8rem;
    }
    
    .form-group.has-error {
        margin-bottom: 8px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .mobile-menu-toggle {
        top: 8px;
        left: 8px;
    }

    .admin-logout-btn {
        top: 8px;
        right: 8px;
        height: 32px;
        min-width: 54px;
        padding: 0 9px;
    }

    .sidebar {
        width: 100%;
    }

    .collection-page header h1 {
        font-size: 1.15rem;
    }

    .collection-page header p {
        margin: 0;
        font-size: 0.82rem;
    }

    .error-pop {
        left: 50%;
        transform: translateX(-50%);
        max-width: 180px;
        font-size: 0.7rem;
        text-align: center;
    }
    
    .error-pop::before {
        left: 50%;
        transform: translateX(-50%) rotate(45deg);
    }
    
    .form-grid {
        gap: 6px;
    }
    
    .form-group {
        min-width: 0;
    }
    
    .upload-placeholder .text {
        font-size: 9px;
    }

    .collection-page .upload-box {
        height: 106px;
    }

    .detail-card {
        padding: 14px;
    }

    .detail-header h2 {
        font-size: 1.22rem;
    }

    .empty-state {
        margin-top: 70px;
        padding: 26px 16px;
    }
}