/* Base */

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

body {
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f5f6fa;
    color: #202434;
    line-height: 1.6;
}

a {
    color: #4f46e5;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Layout */

.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: #171b2e;
    color: #ffffff;
    padding: 28px 18px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-brand {
    margin-bottom: 40px;
}

.sidebar-brand h2 {
    font-size: 21px;
}

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

.nav-section {
    color: #9299b5;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 22px 0 5px;
}

.nav-link {
    color: #d8daea;
    padding: 11px 13px;
    border-radius: 8px;
    transition: background 0.2s;
}

.nav-link:hover {
    background: #292e49;
    color: #ffffff;
    text-decoration: none;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 25px;
    color: #aab0ca;
    font-size: 13px;
}

.main-area {
    flex: 1;
    min-width: 0;
}

/* Header */

.topbar {
    min-height: 90px;
    background: #ffffff;
    border-bottom: 1px solid #e8e9f0;
    padding: 20px 35px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.topbar h1 {
    font-size: 22px;
}

.topbar p {
    color: #85899b;
    font-size: 13px;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 18px;
    font-size: 14px;
}

.page-content {
    padding: 35px;
    max-width: 1400px;
    margin: auto;
}

/* Headings */

h2 {
    font-size: 25px;
    margin-bottom: 8px;
}

h3 {
    font-size: 17px;
    margin-bottom: 15px;
}

/* Buttons */

button,
.button {
    border: none;
    border-radius: 7px;
    padding: 10px 16px;
    font-size: 14px;
    cursor: pointer;
    display: inline-block;
}

.button-primary {
    background: #4f46e5;
    color: white;
}

.button-primary:hover {
    background: #4338ca;
}

.button-secondary {
    background: #eceef5;
    color: #303448;
}

.button-secondary:hover {
    background: #dfe2ed;
}

/* Forms */

input,
select,
textarea {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid #dfe1e9;
    border-radius: 7px;
    background: white;
    font: inherit;
    margin: 5px 0 15px;
}

label {
    font-size: 14px;
    font-weight: 600;
}

/* Tables */

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
}

th,
td {
    padding: 13px 15px;
    border-bottom: 1px solid #eceef3;
    text-align: left;
}

th {
    background: #f0f1f7;
    font-size: 13px;
}

td {
    font-size: 14px;
}

/* Messages */

.messages {
    margin-bottom: 22px;
}

.message {
    padding: 13px 16px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-size: 14px;
}

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

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

.message-warning {
    background: #fef3c7;
    color: #92400e;
}

.message-info {
    background: #dbeafe;
    color: #1e40af;
}

/* Responsive */

@media (max-width: 800px) {
    .app-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: 15px;
    }

    .sidebar-brand {
        margin-bottom: 15px;
    }

    .sidebar-nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .nav-section {
        width: 100%;
        margin-top: 12px;
    }

    .sidebar-footer {
        margin-top: 15px;
    }

    .topbar {
        padding: 18px;
        align-items: flex-start;
        flex-direction: column;
    }

    .page-content {
        padding: 20px 15px;
    }

    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}
/* Dashboard */

.page-heading {
    margin-bottom: 30px;
}

.page-heading h2 {
    margin-bottom: 5px;
}

.text-muted {
    color: #85899b;
    font-size: 14px;
}

.panel {
    background: white;
    border: 1px solid #e8e9f0;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 30px;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.section-heading h3 {
    margin-bottom: 4px;
}

.form-inline {
    display: flex;
    align-items: flex-end;
    gap: 15px;
    flex-wrap: wrap;
}

.form-field {
    flex: 1;
    min-width: 220px;
}

.form-field input {
    margin-bottom: 0;
}

.action-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.content-section {
    margin-top: 35px;
}

.count-badge,
.status-badge {
    background: #eef0ff;
    color: #4f46e5;
    padding: 6px 11px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.classroom-card {
    background: white;
    border: 1px solid #e8e9f0;
    border-radius: 12px;
    padding: 22px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.classroom-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(20, 25, 50, 0.07);
}

.card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 18px;
}

.card-label {
    color: #85899b;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
}

.classroom-card h3 {
    font-size: 19px;
    margin-bottom: 8px;
}

.card-action {
    margin-top: 20px;
}

.empty-state {
    background: white;
    border: 1px dashed #d5d7e2;
    border-radius: 12px;
    padding: 45px 20px;
    text-align: center;
}

.empty-state h3 {
    margin-bottom: 8px;
}

@media (max-width: 600px) {
    .section-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .form-inline {
        align-items: stretch;
        flex-direction: column;
    }

    .form-field {
        min-width: 100%;
    }
}

/* Classroom Detail */

.back-link {
    display: inline-block;
    margin-bottom: 15px;
    font-size: 14px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
    margin-bottom: 22px;
}

.info-item {
    background: #f7f8fc;
    border-radius: 9px;
    padding: 16px;
}

.info-label {
    display: block;
    color: #85899b;
    font-size: 12px;
    margin-bottom: 6px;
}

.info-item strong {
    font-size: 15px;
}

.assignment-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid #eceef3;
}

.assignment-row:last-of-type {
    border-bottom: none;
}

.section-action {
    margin-top: 18px;
}

.table-wrapper {
    width: 100%;
    overflow-x: auto;
}

.student-actions {
    min-width: 120px;
}

.student-actions summary {
    cursor: pointer;
    color: #4f46e5;
    font-size: 14px;
    font-weight: 600;
    padding: 5px 0;
}

.student-actions form {
    margin-top: 12px;
    min-width: 190px;
}

.button-danger {
    background: #fee2e2;
    color: #991b1b;
}

.button-danger:hover {
    background: #fecaca;
}

@media (max-width: 600px) {
    .assignment-row {
        align-items: flex-start;
        flex-direction: column;
    }
}

/* Timetable */

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

.table-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Attendance Summary */

.attendance-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin: 20px 0 25px;
}

.summary-item {
    background: #f3f4f8;
    padding: 16px;
    border-radius: 9px;
}

.summary-item span {
    display: block;
    color: #777d91;
    font-size: 12px;
    margin-bottom: 5px;
}

.summary-item strong {
    font-size: 23px;
}

.present-summary {
    background: #dcfce7;
    color: #166534;
}

.absent-summary {
    background: #fee2e2;
    color: #991b1b;
}

/* Attendance Cards */

.attendance-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.attendance-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    padding: 16px;
    background: #fafbfe;
    border: 1px solid #e8e9f0;
    border-radius: 10px;
}

.student-identity {
    display: flex;
    align-items: center;
    gap: 12px;
}

.roll-badge {
    background: #eef0ff;
    color: #4f46e5;
    padding: 7px 11px;
    border-radius: 7px;
    font-size: 13px;
    font-weight: 700;
}

.attendance-options {
    display: flex;
    gap: 10px;
}

.attendance-option {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid #dfe1e9;
    border-radius: 7px;
    cursor: pointer;
    font-size: 13px;
}

.attendance-option input {
    width: auto;
    margin: 0;
    cursor: pointer;
}

.present-option:has(input:checked) {
    background: #dcfce7;
    border-color: #86d7a2;
    color: #166534;
}

.absent-option:has(input:checked) {
    background: #fee2e2;
    border-color: #f3a0a0;
    color: #991b1b;
}

.attendance-submit {
    margin-top: 25px;
    display: flex;
    justify-content: flex-end;
}

@media (max-width: 800px) {
    .attendance-summary {
        grid-template-columns: repeat(2, 1fr);
    }

    .attendance-card {
        align-items: flex-start;
        flex-direction: column;
    }

    .attendance-options {
        width: 100%;
    }

    .attendance-option {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 400px) {
    .attendance-summary {
        grid-template-columns: 1fr 1fr;
    }
}


/* ==============================
   REPORT PAGES
============================== */

.report-summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.report-stat {
    background: #f3f4f8;
    border: 1px solid #e8e9f0;
    border-radius: 10px;
    padding: 18px;
}

.report-stat span {
    display: block;
    color: #777d91;
    font-size: 13px;
    margin-bottom: 8px;
}

.report-stat strong {
    display: block;
    font-size: 25px;
    font-weight: 700;
    color: #25283a;
}

.stat-present {
    background: #dcfce7;
    border-color: #bbf7d0;
}

.stat-present strong {
    color: #166534;
}

.stat-absent {
    background: #fee2e2;
    border-color: #fecaca;
}

.stat-absent strong {
    color: #991b1b;
}

.stat-percentage {
    background: #eef0ff;
    border-color: #dfe2ff;
}

.stat-percentage strong {
    color: #4f46e5;
}

.stat-unmarked {
    background: #fff7ed;
    border-color: #fed7aa;
}

.stat-unmarked strong {
    color: #9a3412;
}

/* Attendance status labels */

.attendance-status {
    display: inline-block;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

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

.status-absent {
    background: #fee2e2;
    color: #991b1b;
}

/* Section spacing */

.section-action {
    margin-top: 20px;
}

.back-link {
    display: inline-block;
    margin-bottom: 12px;
    color: #6366f1;
    font-size: 14px;
    font-weight: 600;
}

/* Responsive report layouts */

@media (max-width: 1000px) {
    .report-summary-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 650px) {
    .report-summary-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .report-stat {
        padding: 14px;
    }

    .report-stat strong {
        font-size: 21px;
    }
}

@media (max-width: 350px) {
    .report-summary-grid {
        grid-template-columns: 1fr;
    }
}


/* ==============================
   ASSIGNMENT FORMS
============================== */

.form-panel {
    max-width: 700px;
}

.form-panel form {
    max-width: 550px;
}

/* ==============================
   LOGIN PAGE
============================== */

.login-page {
    min-height: 100vh;
    background: #f4f5fa;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 18px;
}

.login-container {
    width: 100%;
    max-width: 440px;
}

.login-brand {
    text-align: center;
    margin-bottom: 28px;
}

.login-logo {
    width: 54px;
    height: 54px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    background: #4f46e5;
    color: white;
    border-radius: 14px;
    font-size: 20px;
    font-weight: 800;
}

.login-brand h1 {
    font-size: 26px;
    margin-bottom: 6px;
}

.login-brand p {
    color: #777d91;
    font-size: 14px;
}

.login-card {
    background: white;
    padding: 32px;
    border: 1px solid #e8e9f0;
    border-radius: 14px;
    box-shadow: 0 8px 30px rgba(30, 35, 60, 0.06);
}

.login-heading {
    margin-bottom: 25px;
}

.login-heading h2 {
    font-size: 23px;
    margin-bottom: 6px;
}

.login-button {
    width: 100%;
    margin-top: 10px;
}

.login-footer {
    text-align: center;
    color: #9296a5;
    font-size: 12px;
    margin-top: 25px;
}

@media (max-width: 480px) {
    .login-card {
        padding: 24px 20px;
    }
}