/* ===== THEME: Dark Navy Blue + Gold (matching Internship Records) ===== */
:root {
    --navy: #1F3A8A;
    --navy-light: #2B4A9E;
    --navy-dark: #162C6B;
    --gold: #D4920B;
    --gold-hover: #B87D08;
    --white: #ffffff;
    --bg: #f0f2f5;
    --border: #d0d5dd;
    --text: #1a1a1a;
    --text-muted: #6b7280;
    --success: #2e7d32;
    --danger: #c62828;
    --header-row: #E8EAF6;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, 'Segoe UI', Roboto, Arial, sans-serif; background: var(--bg); color: var(--text); font-size: 13px; }

/* ===== Top Bar ===== */
.top-bar {
    background: var(--navy);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 48px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}
.top-bar .logo-link {
    color: var(--white);
    text-decoration: none;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.top-bar .logo-link i { font-size: 18px; }
.logo-img {
    height: 30px;
    width: 30px;
    border-radius: 50%;
    object-fit: cover;
    background: #fff;
}
.top-bar-nav { display: flex; gap: 2px; align-items: center; }
.top-bar-nav a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 4px;
    font-size: 13px;
    transition: all 0.15s;
    white-space: nowrap;
}
.top-bar-nav a:hover { background: rgba(255,255,255,0.1); color: var(--white); }
.top-bar-nav a.active-nav { background: var(--gold); color: var(--white); font-weight: 600; border-radius: 4px; }
.top-bar-nav a i { margin-right: 4px; }
.admin-badge {
    background: var(--gold);
    color: var(--white);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== Main Content ===== */
.main-content { padding: 16px 20px; }

/* ===== Sheet Tabs ===== */
.sheet-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 0;
}
.sheet-tab {
    background: var(--white);
    border: 1px solid var(--border);
    border-bottom: 2px solid var(--white);
    border-radius: 6px 6px 0 0;
    padding: 8px 18px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: default;
    position: relative;
    z-index: 2;
}
.sheet-tab.active {
    color: var(--navy);
    border-bottom-color: var(--white);
}
.sheet-tab i { margin-right: 6px; color: var(--navy); }

/* ===== Filter Bar ===== */
.filter-bar {
    background: var(--white);
    border: 1px solid var(--border);
    border-top: none;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.search-icon {
    color: #888;
    font-size: 15px;
    width: 28px;
    text-align: center;
}
.filter-bar input[type="text"] {
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 7px 12px;
    font-size: 13px;
    width: 300px;
    outline: none;
    background: var(--white);
}
.filter-bar input[type="text"]:focus { border-color: var(--navy); box-shadow: 0 0 0 2px rgba(27,43,101,0.1); }
.filter-bar select {
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 7px 10px;
    font-size: 13px;
    background: var(--white);
    outline: none;
    cursor: pointer;
}
.filter-bar select:focus { border-color: var(--navy); }
.row-count {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: auto;
    white-space: nowrap;
    background: #f0f2f5;
    padding: 4px 10px;
    border-radius: 4px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 7px 16px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--white);
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
    white-space: nowrap;
}
.btn:hover { background: #f5f5f5; }
.btn-primary {
    background: var(--white);
    color: var(--navy);
    border: 2px solid var(--navy);
    font-weight: 600;
}
.btn-primary:hover { background: var(--navy); color: var(--white); }
.btn-gold, .btn-save {
    background: var(--gold);
    color: var(--white);
    border-color: var(--gold);
    font-weight: 600;
}
.btn-gold:hover, .btn-save:hover { background: var(--gold-hover); }
.btn-danger { background: var(--danger); color: var(--white); border-color: var(--danger); }

/* ===== Data Table ===== */
.table-wrapper {
    overflow-x: auto;
    background: var(--white);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 6px 6px;
}
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table thead th {
    background: var(--header-row);
    border: 1px solid #C5CAE9;
    padding: 10px 12px;
    text-align: left;
    font-weight: 700;
    color: var(--navy);
    white-space: nowrap;
    position: sticky;
    top: 0;
    z-index: 10;
    font-size: 12px;
}
.data-table th.sortable { cursor: pointer; user-select: none; }
.data-table th.sortable:hover { background: #D1D5F0; }
.sort-icon { margin-left: 4px; font-size: 10px; color: #9FA8C7; }
.data-table th.sortable:hover .sort-icon { color: var(--navy); }

.data-table td {
    border: 1px solid #E8EAF0;
    padding: 8px 12px;
    vertical-align: top;
    max-width: 250px;
    overflow: hidden;
    text-overflow: ellipsis;
}
.data-table tbody tr:nth-child(even) { background: #FAFBFE; }
.data-table tbody tr:hover { background: #FFF9E6; }
.row-num {
    color: var(--navy);
    text-align: center;
    font-size: 12px;
    font-weight: 600;
    min-width: 32px;
    background: #F5F6FA;
}

/* ===== Actions ===== */
.actions { white-space: nowrap; text-align: center; }
.actions a { color: var(--text-muted); margin: 0 4px; font-size: 13px; text-decoration: none; }
.actions a:hover { color: var(--navy); }

/* ===== Alerts ===== */
.alert { padding: 10px 14px; border-radius: 4px; margin-bottom: 12px; font-size: 13px; }
.alert-danger { background: #fce4e4; color: var(--danger); border: 1px solid #f5c6c6; }
.alert-success { background: #e8f5e9; color: var(--success); border: 1px solid #c8e6c9; }

/* ===== Forms ===== */
.form-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 24px;
    max-width: 900px;
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-group { margin-bottom: 0; }
.form-group.full { grid-column: 1 / -1; }
.form-group label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 8px 10px;
    font-size: 13px;
    outline: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--navy); box-shadow: 0 0 0 2px rgba(27,43,101,0.1); }
.form-group input[readonly] { background: #f5f5f5; color: var(--text-muted); }
.form-actions { margin-top: 18px; display: flex; gap: 10px; }

/* ===== Multi-value (PI, Co-PI, Docs) ===== */
.multi-group { display: flex; flex-direction: column; gap: 6px; }
.multi-row { display: flex; gap: 6px; align-items: center; }
.multi-row input { flex: 1; }
.btn-add, .btn-remove {
    width: 28px; height: 28px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--text-muted);
}
.btn-add:hover { background: #e8f5e9; color: var(--success); border-color: var(--success); }
.btn-remove:hover { background: #fce4e4; color: var(--danger); border-color: var(--danger); }

/* ===== Login ===== */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 48px);
    background: var(--bg);
}
.login-box {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 36px 32px;
    width: 360px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.login-box h2 { color: var(--navy); margin-bottom: 20px; font-size: 18px; }
.login-box .form-group { text-align: left; margin-bottom: 14px; }
.login-box .btn-save { width: 100%; justify-content: center; padding: 10px; font-size: 14px; }

/* ===== Bulk Upload ===== */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    color: var(--text-muted);
    transition: border-color 0.15s;
}
.upload-zone:hover { border-color: var(--gold); }

/* ===== Footer ===== */
.app-footer {
    display: flex;
    justify-content: space-between;
    padding: 12px 20px;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: 20px;
}

/* ===== Fieldset Form Sections ===== */
.form-section {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 18px 20px 14px;
    margin-bottom: 18px;
    background: var(--white);
}
.form-section legend {
    font-size: 14px;
    font-weight: 700;
    color: var(--gold);
    padding: 0 8px;
}
.form-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-bottom: 12px;
}
.form-row.cols-3 { grid-template-columns: repeat(3, 1fr); }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row .span-2 { grid-column: span 2; }
.form-row .span-3 { grid-column: span 3; }
.form-row .span-4 { grid-column: span 4; }
.hint { font-size: 10px; color: var(--gold); margin-top: 3px; }
.req { color: var(--danger); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .form-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr !important; }
    .form-row .span-2, .form-row .span-3, .form-row .span-4 { grid-column: span 1; }
    .filter-bar { flex-direction: column; align-items: stretch; }
    .filter-bar input[type="text"] { width: 100%; }
    .top-bar { flex-direction: column; height: auto; padding: 10px; gap: 6px; }
    .top-bar-nav { flex-wrap: wrap; justify-content: center; }
}