/* =====================
   CSS Variables
   ===================== */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-success: #16a34a;
    --color-warning: #d97706;
    --color-danger: #dc2626;
    --color-info: #0891b2;
    
    --color-bg: #f8fafc;
    --color-card: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* =====================
   Reset & Base
   ===================== */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

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

a:hover {
    text-decoration: underline;
}

h1, h2, h3 {
    margin: 0 0 1rem 0;
}

/* =====================
   Layout
   ===================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* =====================
   Navbar
   ===================== */
.navbar {
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.nav-brand a:hover {
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-muted);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.logout-btn {
    background: var(--color-bg);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
}

/* =====================
   Login Page
   ===================== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: var(--color-card);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-container h1 {
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.login-subtitle {
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.login-hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    opacity: 0.8;
}

.login-form {
    text-align: left;
}

/* =====================
   Cards
   ===================== */
.card {
    background: var(--color-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

/* =====================
   Buttons
   ===================== */
.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
}

.btn-danger {
    background: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* =====================
   Forms
   ===================== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color 0.15s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    align-items: end;
}

.form-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.inline-form {
    display: flex;
    align-items: end;
    gap: 1rem;
    flex-wrap: wrap;
}

.inline-form .form-group {
    margin-bottom: 0;
    flex: 1;
    min-width: 150px;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-weight: normal;
    cursor: pointer;
}

.checkbox-label input {
    width: auto;
}

/* =====================
   Flash Messages
   ===================== */
.flash-messages {
    margin-bottom: 1.5rem;
}

.flash {
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flash-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}

.flash-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.flash-info {
    background: #e0f2fe;
    color: #075985;
    border: 1px solid #7dd3fc;
}

.flash-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.7;
}

.flash-close:hover {
    opacity: 1;
}

/* =====================
   Dashboard
   ===================== */
.dashboard-header {
    margin-bottom: 1rem;
}

.dashboard-header h1 {
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--color-text-muted);
    margin: 0;
}

.dashboard-search {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--color-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.dashboard-search input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    max-width: 500px;
}

.dashboard-search input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-results {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.legend {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--color-card);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* =====================
   Teams Grid
   ===================== */
.teams-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.team-card {
    position: relative;
    background: var(--color-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.25rem;
    display: block;
    color: inherit;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

/* Dashboard card tooltip for full challenge description */
.team-card-tooltip {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-top: 0.5rem;
    padding: 1rem;
    background: #1e293b;
    color: white;
    font-size: 0.8125rem;
    line-height: 1.5;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-width: 400px;
}

.team-card-tooltip::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 1rem;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid #1e293b;
}

.team-card:hover .team-card-tooltip {
    display: block;
}

.team-card:hover {
    text-decoration: none;
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    z-index: 50;
}

.team-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.team-header h2 {
    font-size: 1.125rem;
    margin: 0;
}

.team-description {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin: 0 0 1rem 0;
    line-height: 1.4;
}

.team-disciplines {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-bottom: 0.75rem;
}

.team-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.meta-item::before {
    content: '•';
    margin-right: 0.5rem;
}

/* =====================
   Badges
   ===================== */
.badges {
    display: flex;
    gap: 0.5rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    min-width: 1.75rem;
}

/* Size badges */
.size-low {
    background: #fee2e2;
    color: #991b1b;
}

.size-ideal {
    background: #dcfce7;
    color: #166534;
}

.size-high {
    background: #fef3c7;
    color: #92400e;
}

/* Discipline badges */
.discipline-low {
    background: #fee2e2;
    color: #991b1b;
}

.discipline-good {
    background: #dcfce7;
    color: #166534;
}

/* =====================
   Discipline Tags
   ===================== */
.discipline-tag {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: #e0f2fe;
    color: #075985;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

.discipline-tag.small {
    padding: 0.125rem 0.375rem;
    font-size: 0.6875rem;
}

.discipline-tag.more {
    background: var(--color-bg);
    color: var(--color-text-muted);
}

/* =====================
   Tables
   ===================== */
.students-table {
    width: 100%;
    border-collapse: collapse;
}

.students-table th,
.students-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.students-table th {
    font-weight: 600;
    color: var(--color-text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.students-table tbody tr:hover {
    background: var(--color-bg);
}

.degree-cell {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.actions-cell {
    white-space: nowrap;
}

.actions-cell form.inline {
    display: inline;
}

/* =====================
   Team Detail
   ===================== */
.breadcrumb {
    margin-bottom: 1.5rem;
}

.breadcrumb a {
    color: var(--color-text-muted);
}

.team-detail-header {
    margin-bottom: 2rem;
}

.team-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.team-title h1 {
    margin: 0;
}

.team-description-full {
    color: var(--color-text-muted);
    font-size: 1rem;
    max-width: 800px;
}

.discipline-breakdown {
    margin-bottom: 1.5rem;
}

.discipline-breakdown h3 {
    margin-bottom: 1rem;
}

.discipline-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* =====================
   Search
   ===================== */
.search-box {
    margin-bottom: 2rem;
}

.search-form {
    display: flex;
    gap: 1rem;
}

.search-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.search-form input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.unassigned {
    color: var(--color-warning);
    font-style: italic;
}

/* =====================
   Modal
   ===================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    background: var(--color-card);
    padding: 2rem;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
}

.modal-content.modal-large {
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-text);
}

.modal-content h3 {
    margin-bottom: 0.5rem;
}

.modal-content p {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

/* Transfer Modal Specific */
.transfer-info {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.transfer-info .current-team {
    color: var(--color-primary);
}

.filter-bar {
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.filter-bar label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Team Selector Grid */
.team-selector-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 0.75rem;
    max-height: 50vh;
    overflow-y: auto;
    padding: 0.5rem;
    margin: -0.5rem;
}

.team-option {
    position: relative;
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.875rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.team-option:hover {
    border-color: var(--color-primary);
    background: white;
}

.team-option.selected {
    border-color: var(--color-primary);
    background: #eff6ff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.team-option.needs-members {
    border-left: 4px solid var(--color-danger);
}

.team-option-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.team-option-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.team-option-desc {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin: 0 0 0.5rem 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Tooltip for full description on hover */
.team-option-tooltip {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-top: 0.5rem;
    padding: 1rem;
    background: #1e293b;
    color: white;
    font-size: 0.8125rem;
    line-height: 1.5;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    max-width: 400px;
    width: max-content;
}

.team-option-tooltip::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 1rem;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 6px solid #1e293b;
}

.team-option:hover .team-option-tooltip {
    display: block;
}

.team-option-disciplines {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.selected-team-label {
    flex: 1;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Highlighted teams that need members */
.team-option.needs-members .team-option-name::after {
    content: ' (needs members)';
    font-weight: normal;
    font-size: 0.75rem;
    color: var(--color-danger);
}

/* Inline team selector (for Add Student page) */
.team-selector-inline {
    max-height: 400px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    background: var(--color-bg);
}

.team-option.unassigned-option {
    background: white;
    border-style: dashed;
}

.selected-team-display {
    font-weight: 500;
    color: var(--color-primary);
}

.filter-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.form-group-wide {
    grid-column: span 1;
}

/* =====================
   Attendance Page
   ===================== */
.attendance-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.attendance-header h1 {
    margin: 0;
}

.attendance-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.filter-form {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-group label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.filter-group select {
    padding: 0.5rem 1rem;
    font-size: 0.9375rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-card);
}

.filter-notice {
    background: #e0f2fe;
    color: #075985;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.attendance-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--color-card);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
    min-width: 100px;
    box-shadow: var(--shadow-sm);
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.auto-save-status .stat-value {
    font-size: 1.25rem;
    transition: color 0.3s ease;
}

.help-text {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-left: 0.5rem;
}

.attendance-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--color-card);
    border-radius: var(--radius-md);
}

.attendance-actions.bottom {
    margin-top: 1.5rem;
    margin-bottom: 0;
    justify-content: center;
}

.bulk-actions {
    display: flex;
    gap: 0.5rem;
}

.attendance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.attendance-team {
    padding: 1rem;
}

.attendance-team-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.attendance-team-header h3 {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.3;
}

.team-title-block {
    flex: 1;
    min-width: 0;
}

.team-meta-small {
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.team-meta-small span {
    display: inline;
    margin-right: 0.75rem;
}

.team-challenge-statement {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.4;
    margin: 0 0 0.75rem 0;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.team-bulk-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.btn-mini {
    padding: 0.25rem 0.5rem;
    font-size: 0.6875rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-muted);
}

.btn-mini:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.team-attendance-stats {
    font-weight: 600;
    color: var(--color-primary);
}

.student-checklist {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.student-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.1s ease;
}

.student-checkbox:hover {
    background: var(--color-bg);
}

.student-checkbox.checked {
    background: #dcfce7;
}

.student-checkbox input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.student-name {
    font-size: 0.875rem;
}

.btn-large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}

/* Attendance Summary */
.attendance-rate {
    font-weight: 600;
}

.attendance-rate.good {
    color: var(--color-success);
}

.attendance-rate.ok {
    color: var(--color-warning);
}

.attendance-rate.low {
    color: var(--color-danger);
}

/* =====================
   Utility
   ===================== */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--color-text-muted);
}

.empty-text {
    color: var(--color-text-muted);
    font-style: italic;
}

.help-text {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* =====================
   Footer
   ===================== */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* =====================
   Responsive
   ===================== */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .container {
        padding: 1rem;
    }
    
    .teams-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .inline-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    .inline-form .btn {
        width: 100%;
    }
    
    .students-table {
        display: block;
        overflow-x: auto;
    }
}