/* AMES Attendance POC - Mobile-first responsive CSS */

:root {
    --primary: #1a5276;
    --primary-light: #2980b9;
    --success: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --grey-light: #f5f6fa;
    --grey-mid: #dcdde1;
    --grey-dark: #636e72;
    --text: #2d3436;
    --white: #fff;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text);
    background: var(--grey-light);
    line-height: 1.5;
    padding-bottom: 80px;
}

/* Nav */
nav {
    background: var(--primary);
    color: var(--white);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}
nav .brand { font-weight: 700; font-size: 1.1rem; }
nav .nav-links { display: flex; gap: 16px; align-items: center; }
nav a { color: var(--white); text-decoration: none; font-size: 0.9rem; opacity: 0.85; }
nav a:hover { opacity: 1; }
nav .user-name { font-size: 0.85rem; opacity: 0.7; }

/* Layout */
.container { max-width: 960px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.4rem; margin-bottom: 16px; color: var(--primary); }
h2 { font-size: 1.15rem; margin: 24px 0 12px; color: var(--primary); }

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    margin-bottom: 12px;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.card-title { font-weight: 600; font-size: 1rem; }
.card-meta { color: var(--grey-dark); font-size: 0.85rem; }

/* Status badges */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-success { background: #d4edda; color: #155724; }
.badge-danger { background: #f8d7da; color: #721c24; }
.badge-warning { background: #fff3cd; color: #856404; }
.badge-info { background: #d1ecf1; color: #0c5460; }
.badge-pending { background: var(--grey-mid); color: var(--grey-dark); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.2s;
    min-height: 44px;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--primary); color: var(--white); }
.btn-success { background: var(--success); color: var(--white); }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}
.btn-sm { padding: 6px 14px; font-size: 0.85rem; min-height: 36px; }
.btn-block { display: block; width: 100%; }

/* ATT/DNA toggle buttons */
.status-btn {
    min-width: 56px;
    min-height: 48px;
    padding: 8px 12px;
    border: 2px solid var(--grey-mid);
    border-radius: var(--radius);
    background: var(--white);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.15s;
}
.status-btn.att { border-color: var(--success); }
.status-btn.att.active { background: var(--success); color: var(--white); }
.status-btn.dna { border-color: var(--danger); }
.status-btn.dna.active { background: var(--danger); color: var(--white); }

/* Tables */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--grey-mid); }
th { background: var(--grey-light); font-weight: 600; color: var(--primary); white-space: nowrap; }
tr:hover { background: #f8f9fa; }

/* Forms */
input, select {
    padding: 8px 12px;
    border: 1px solid var(--grey-mid);
    border-radius: var(--radius);
    font-size: 0.95rem;
    width: 100%;
    min-height: 40px;
}
input:focus, select:focus { outline: 2px solid var(--primary-light); border-color: transparent; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 4px; font-size: 0.9rem; }
.input-sm { width: 80px; }
.actual-time-input.input-sm { width: 180px; }

/* Student row in marking */
.student-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 0;
    border-bottom: 1px solid var(--grey-mid);
    flex-wrap: wrap;
}
.student-name { flex: 1; min-width: 140px; }
.student-name .name { font-weight: 600; }
.student-name .sid { color: var(--grey-dark); font-size: 0.8rem; }
.unit-select { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-size: 0.82rem; }
.unit-label { font-weight: 600; color: var(--grey-dark); margin-right: 2px; }
.unit-checkbox { display: inline-flex; align-items: center; gap: 3px; cursor: pointer; white-space: nowrap; }
.unit-checkbox input[type="checkbox"] { margin: 0; accent-color: var(--primary); }
.unit-checkbox span { color: var(--dark); }
.student-actions { display: flex; gap: 6px; align-items: center; }
.student-extra {
    width: 100%;
    display: none;
    padding: 8px 0 4px 0;
    gap: 8px;
}
.student-extra.show { display: flex; flex-wrap: wrap; gap: 16px; }
.student-extra .form-group { margin-bottom: 0; flex: none; }
.student-extra .form-group.actual-time { min-width: 200px; }
.student-extra .form-group.actual-hours { min-width: 100px; }
.student-extra .form-group.absence-reason { min-width: 200px; }

/* Stats grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}
.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    text-align: center;
}
.stat-value { font-size: 1.8rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 0.8rem; color: var(--grey-dark); text-transform: uppercase; }

/* Rate colours */
.rate-high { color: var(--success); }
.rate-mid { color: var(--warning); }
.rate-low { color: var(--danger); }

/* Flash messages */
.flash {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-weight: 500;
}
.flash-error { background: #f8d7da; color: #721c24; }
.flash-success { background: #d4edda; color: #155724; }

/* Login page */
.login-container {
    max-width: 400px;
    margin: 60px auto;
    padding: 32px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.login-container h1 { text-align: center; margin-bottom: 24px; }
.demo-credentials {
    margin-top: 20px;
    padding: 12px;
    background: var(--grey-light);
    border-radius: var(--radius);
    font-size: 0.85rem;
}
.demo-credentials code { background: #e8e8e8; padding: 1px 4px; border-radius: 3px; }

/* Session header */
.session-header {
    background: var(--primary);
    color: var(--white);
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
}
.session-header .meta { opacity: 0.85; font-size: 0.9rem; }

/* Toolbar */
.toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

/* Confirmation banner */
.confirm-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--success);
    color: var(--white);
    padding: 16px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
    z-index: 200;
    transform: translateY(100%);
    transition: transform 0.3s;
}
.confirm-banner.show { transform: translateY(0); }

/* Submit bar */
.submit-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    padding: 12px 16px;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    z-index: 150;
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Tablet+ layout */
@media (min-width: 768px) {
    .container { padding: 24px; }
    h1 { font-size: 1.6rem; }
    .student-row { flex-wrap: nowrap; }
    .student-extra { width: auto; flex: none; }
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
}