:root {
    --primary: #0f172a; /* Slate 900 */
    --accent: #3b82f6;  /* Blue 500 */
    --accent-hover: #2563eb;
    --success: #10b981;
    --error: #ef4444;
    --surface: #ffffff;
    --bg: #f8fafc;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-muted: #64748b;
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    font-size: 14px; /* Default font size reduced */
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 4rem 1.5rem;
    color: var(--text-primary);
}

.container {
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding-top: 5rem; /* Space for fixed header */
    padding-bottom: 6rem; /* Space for footer */
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Header Section */
.card.header {
    background: var(--primary);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.75rem 1rem;
    text-align: center;
    border-radius: 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border-bottom: 2px solid var(--accent);
}

.header h1 {
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.2px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.header-refresh-btn {
    position: absolute;
    right: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
    padding: 0;
}

.header-refresh-btn:hover {
    background: var(--accent);
    transform: translateY(-50%) rotate(180deg);
    border-color: white;
}

.header-refresh-btn:active {
    transform: translateY(-50%) scale(0.9);
}

.header-refresh-btn.spinning svg {
    animation: rotateLoop 1s linear infinite;
}

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

/* Form Layout */
.form-container {
    background: #f8fafc;
    border-radius: var(--radius);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.form-section {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.85rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.form-section:hover {
    box-shadow: var(--shadow-md);
}

.section-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: white;
    background: var(--primary); /* Matching Main Header */
    margin: -0.85rem -0.85rem 0.75rem -0.85rem;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 12px 12px 0 0;
    border-bottom: 2px solid var(--accent);
}

.section-title svg {
    width: 16px;
    height: 16px;
    color: var(--accent);
}

/* Inputs & Labels */
.input-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

input, select, textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-primary);
    background: #ffffff;
    transition: all 0.2s ease;
    outline: none;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Checklists */
.list-container {
    max-height: 250px;
    overflow-y: auto;
    padding: 1rem;
    background: #f1f5f9;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Custom Scrollbar */
.list-container::-webkit-scrollbar { width: 6px; }
.list-container::-webkit-scrollbar-track { background: transparent; }
.list-container::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 10px;
}

.teacher-grid, .student-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 0.75rem;
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.6rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    flex-wrap: nowrap;
    overflow: hidden;
}

.checklist-item:hover {
    border-color: var(--accent);
    background: #eff6ff;
    transform: translateX(4px);
}

.checklist-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin: 0;
    cursor: pointer;
    accent-color: var(--accent);
}

.checklist-item label {
    font-size: 0.8rem;
    color: var(--text-primary);
    cursor: pointer;
    flex-grow: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.class-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 7px;
    background: #e2e8f0;
    border-radius: 20px;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* Attendance Row Header */
.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.text-btn {
    background: transparent;
    border: none;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.75rem;
    cursor: pointer;
    transition: color 0.2s;
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
}

.secondary-btn {
    background: #f1f5f9;
    border: 1px solid var(--border);
    color: var(--primary);
    padding: 0.55rem 1rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.secondary-btn:hover {
    background: #e2e8f0;
    border-color: #cbd5e1;
    color: var(--accent);
}

.secondary-btn:active {
    transform: scale(0.98);
}

/* File Upload Area */
.file-upload-wrapper {
    background: #f8fafc;
    border: 2px dashed #cbd5e1;
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
    transition: all 0.2s;
}

.file-upload-wrapper:hover {
    border-color: var(--accent);
    background: #f1f5f9;
}

.upload-icon {
    margin-bottom: 1rem;
    color: var(--accent);
}

/* Preview Grid */
.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.preview-item {
    position: relative;
    aspect-ratio: 1/1;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 28px;
    height: 28px;
    background: var(--error);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Summary Box */
.attendance-summary {
    margin-top: 0.75rem;
    background: #0f172a;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 500;
    display: flex;
    flex-wrap: nowrap; /* Force 1 line */
    justify-content: center;
    gap: 0.75rem;
    white-space: nowrap;
}

.attendance-summary span {
    color: #60a5fa;
    font-weight: 700;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 1.25rem;
    background: linear-gradient(to right, var(--accent), var(--accent-hover));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.3);
    transition: all 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(59, 130, 246, 0.4);
}

.submit-btn:active {
    transform: scale(0.98);
}

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none; /* Default Hidden */
}

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

/* Toast Notification */
.toast {
    position: fixed;
    top: 5rem;
    left: 50%;
    transform: translateX(-50%) translateY(-20px) scale(0.95);
    opacity: 0;
    visibility: hidden;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    color: white;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.85rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    z-index: 2000;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid rgba(255,255,255,0.1);
}

.toast.show { 
    opacity: 1; 
    visibility: visible; 
    transform: translateX(-50%) translateY(0) scale(1); 
}
.toast.success { border-bottom: 4px solid var(--success); }
.toast.error { border-bottom: 4px solid var(--error); }

/* Placeholder and Empty States */
.placeholder-text {
    color: var(--text-muted);
    font-size: 0.95rem;
    text-align: center;
    padding: 2rem;
    font-style: italic;
}

/* Main Container Adjustment */
.container {
    padding-bottom: 7rem;
}

/* App Footer / Bottom Navigation */
.app-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    padding: 0.5rem 1rem env(safe-area-inset-bottom, 0.5rem) 1rem;
    box-shadow: 0 -5px 25px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    border-top: 1px solid var(--border);
}

.nav-tabs {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    background: #f8fafc;
    border-radius: 40px;
    padding: 0.3rem;
    gap: 0.35rem;
    border: 1px solid var(--border);
}

.nav-btn {
    flex: 1;
    padding: 0.55rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-weight: 700;
    cursor: pointer;
    border-radius: 35px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    font-size: 0.8rem;
    display: flex;
    flex-direction: row; /* Horizontal Icons */
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.nav-btn.active {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.nav-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.view {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    animation: fadeIn 0.4s ease-out;
}

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

/* Reports Dashboard */
.reports-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.report-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0; /* Header spans edges */
    transition: all 0.2s;
    overflow: hidden;
    border-left: 4px solid var(--accent);
}

.report-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.report-header {
    background: var(--primary); /* Dark Header */
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--accent);
}

.report-subjek {
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.report-date {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
}

.report-body {
    padding: 0.85rem 1rem 1rem 1rem;
}

.report-details {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.35rem;
    font-size: 0.8rem;
}

.detail-row {
    display: flex;
    gap: 0.5rem;
}

.detail-label {
    color: var(--text-muted);
    font-weight: 600;
    min-width: 90px;
}

.report-images {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.report-img-preview {
    display: block;
    width: 80px;
    height: 80px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: all 0.2s;
    background: #f1f5f9;
}

.report-img-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.report-img-preview:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body { padding: 2rem 1rem; }
    .header h1 { font-size: 1.25rem; }
    .input-row { grid-template-columns: 1fr; }
    .card.header { padding: 2rem 1.5rem; }
    .form-container { padding: 1rem; }
    .attendance-summary { gap: 0.5rem; }
}