:root {
    --bg: #eef2f7;
    --panel: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: #d7deea;
    --primary: #000000;
    --primary-soft: #dbeafe;
    --accent: #ccae5d;
    --success: #18794e;
    --danger: #b42318;
    --shadow: 0 14px 35px rgba(15, 76, 129, 0.12);
    --maroon: #7a0019;
    --green: #18794e;
    --black-btn: #111111;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(160deg, #f9fbfd 0%, #edf3f8 55%, #dde8f4 100%);
    color: var(--text);
}

a {
    color: var(--primary);
    text-decoration: none;
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 280px 1fr;
}

.sidebar {
    background: linear-gradient(180deg, #501717 0%, #7e4242 100%);
    color: #fff;
    padding: 28px 22px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar h1 {
    font-size: 1.35rem;
    line-height: 1.4;
    margin: 0 0 8px;
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav a {
    color: #fff;
    padding: 10px 12px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
}

.nav a:hover {
    background: rgba(255, 255, 255, 0.16);
}

.content {
    padding: 30px;
}

.page-head {
    margin-bottom: 22px;
}

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

.grid {
    display: grid;
    gap: 20px;
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.card h3 {
    margin-top: 0;
}

.stat {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.form-group {
    margin-bottom: 16px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
}

input,
select,
textarea,
button {
    width: 100%;
    border-radius: 12px;
    border: 1px solid #cbd5e1;
    padding: 12px 14px;
    font: inherit;
}

textarea {
    min-height: 110px;
    resize: vertical;
}

button,
.btn {
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: inline-block;
    text-align: center;
}

.login-card button[type="submit"],
.content .card form > button[type="submit"]:not(.btn-warning):not(.btn-success):not(.student-action),
.content .card form button[name="add_faculty"],
.content .card form button[name="update_faculty"],
.content .card form button[name="add_subject"],
.content .card form button[name="update_subject"],
.content .card form button[name="add_student"],
.content .card form button[name="update_student"],
.content .card form button[name="assign_subject"],
.content .card form button[name="add_question"],
.content .card form button[name="update_question"] {
    background: var(--maroon) !important;
    color: #ffffff !important;
    border: 1px solid var(--maroon) !important;
    transition: all 0.2s ease;
}

.login-card button[type="submit"]:hover,
.content .card form > button[type="submit"]:not(.btn-warning):not(.btn-success):not(.student-action):hover,
.content .card form button[name="add_faculty"]:hover,
.content .card form button[name="update_faculty"]:hover,
.content .card form button[name="add_subject"]:hover,
.content .card form button[name="update_subject"]:hover,
.content .card form button[name="add_student"]:hover,
.content .card form button[name="update_student"]:hover,
.content .card form button[name="assign_subject"]:hover,
.content .card form button[name="add_question"]:hover,
.content .card form button[name="update_question"]:hover {
    background: #ffffff !important;
    color: var(--maroon) !important;
    border-color: var(--maroon) !important;
}

.actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.actions .btn,
.actions button {
    min-width: 96px;
    padding: 12px 14px;
    border-radius: 12px !important;
}

.actions form {
    margin: 0;
}

a.btn.btn-secondary,
button.btn-warning {
    background: var(--black-btn) !important;
    color: #ffffff !important;
    border: 1px solid var(--black-btn) !important;
    border-radius: 12px !important;
    transition: all 0.2s ease;
}

a.btn.btn-secondary:hover,
button.btn-warning:hover {
    background: #ffffff !important;
    color: var(--black-btn) !important;
    border-color: var(--black-btn) !important;
}

.qr-buttons .btn,
.qr-buttons .btn-secondary,
.qr-buttons .btn-success,
.qr-generate-form .btn-success,
.qr-generate-form button[type="submit"],
.results-actions button[name="reset_semester"] {
    background: var(--green) !important;
    color: #ffffff !important;
    border: 1px solid var(--green) !important;
    transition: all 0.2s ease;
}

.qr-buttons .btn:hover,
.qr-buttons .btn-secondary:hover,
.qr-buttons .btn-success:hover,
.qr-generate-form .btn-success:hover,
.qr-generate-form button[type="submit"]:hover,
.results-actions button[name="reset_semester"]:hover {
    background: #ffffff !important;
    color: var(--green) !important;
    border-color: var(--green) !important;
}

a.btn.student-action {
    min-width: 96px !important;
    padding: 12px 14px !important;
    border-radius: 12px !important;
    background: #ffffff !important;
    color: var(--black-btn) !important;
    border: 1px solid var(--black-btn) !important;
    transition: all 0.2s ease;
}

a.btn.student-action:hover {
    background: var(--maroon) !important;
    color: #ffffff !important;
    border-color: var(--maroon) !important;
}

.btn-success {
    background: var(--success);
}

.inline-form {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}

th {
    background: #f8fafc;
}

.alert {
    padding: 14px 16px;
    border-radius: 12px;
    margin-bottom: 18px;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
}

.alert-info {
    background: #dbeafe;
    color: #1d4ed8;
}

.login-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: min(480px, 100%);
}

.rating-row {
    display: grid;
    grid-template-columns: 1.5fr repeat(5, minmax(48px, 64px));
    gap: 8px;
    align-items: center;
}

.rating-head {
    font-weight: 700;
    color: var(--muted);
    margin-bottom: 10px;
}

.badge {
    display: inline-block;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 0.9rem;
}

.badge-completed {
    background: #dcfce7 !important;
    color: var(--green) !important;
}

.qr-preview {
    width: 220px;
    max-width: 100%;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    padding: 10px;
}

@media (max-width: 980px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        padding-bottom: 12px;
    }

    .grid-2,
    .grid-3,
    .rating-row {
        grid-template-columns: 1fr;
    }
}