/* assets/css/main.css — Think & Tinker Design System */
@import url('variables.css');
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800&family=Quicksand:wght@500;600;700&display=swap');

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: 'Nunito', 'Segoe UI', sans-serif;
    font-size: 1rem; line-height: 1.6; color: var(--charcoal);
    background-color: var(--warm-white);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--tinker-teal); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--deep-navy); }
ul, ol { list-style: none; }
button, input, select, textarea {
    font-family: inherit; font-size: inherit; color: inherit;
    border: none; outline: none; background: none;
}
table { border-collapse: collapse; width: 100%; }

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Quicksand', 'Nunito', sans-serif;
    font-weight: 700; line-height: 1.25; color: var(--deep-navy);
}
h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
p { margin-bottom: var(--space-2); }
.text-teal { color: var(--tinker-teal); }
.text-orange { color: var(--spark-orange); }
.text-navy { color: var(--deep-navy); }
.text-muted { color: #999; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.fw-800 { font-weight: 800; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--space-2); }
.container-sm { max-width: 640px; margin: 0 auto; padding: 0 var(--space-2); }
.container-md { max-width: 860px; margin: 0 auto; padding: 0 var(--space-2); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* Grid system */
.grid { display: grid; gap: var(--space-3); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.375rem; }
}
@media (min-width: 769px) and (max-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

.w-full { width: 100%; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: var(--btn-height); padding: 0 24px;
    font-weight: 700; font-size: 0.9375rem; border-radius: var(--radius-md);
    cursor: pointer; transition: all 0.2s ease; white-space: nowrap;
    text-decoration: none; line-height: 1;
}
.btn:active { transform: scale(0.97); }
.btn:disabled, .btn.disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

.btn-primary { background: var(--tinker-teal); color: #FFF; }
.btn-primary:hover { background: #17998c; color: #FFF; }

.btn-secondary { background: var(--spark-orange); color: #FFF; }
.btn-secondary:hover { background: #e06d18; color: #FFF; }

.btn-navy { background: var(--deep-navy); color: #FFF; }
.btn-navy:hover { background: #152238; color: #FFF; }

.btn-outline {
    background: transparent; color: var(--tinker-teal);
    border: 2px solid var(--tinker-teal);
}
.btn-outline:hover { background: var(--tinker-teal); color: #FFF; }

.btn-ghost { background: transparent; color: var(--charcoal); }
.btn-ghost:hover { background: var(--cloud-gray); }

.btn-danger { background: var(--story-coral); color: #FFF; }
.btn-danger:hover { background: #d4533f; color: #FFF; }

.btn-success { background: var(--leaf-green); color: #FFF; }
.btn-success:hover { background: #219a52; color: #FFF; }

.btn-sm { height: 36px; padding: 0 16px; font-size: 0.8125rem; }
.btn-lg { height: 56px; padding: 0 32px; font-size: 1.0625rem; }
.btn-block { width: 100%; }
.btn-icon { width: var(--btn-height); padding: 0; }
.btn-icon.btn-sm { width: 36px; }

/* ============================================================
   FORMS
   ============================================================ */
.form-group { margin-bottom: var(--space-2); }
.form-label {
    display: block; font-size: 0.8125rem; font-weight: 700;
    color: var(--deep-navy); margin-bottom: 4px;
}
.form-label .required { color: var(--story-coral); }
.form-input, .form-select, .form-textarea {
    width: 100%; height: var(--input-height); padding: 0 16px;
    border: 2px solid var(--cloud-gray); border-radius: var(--radius-md);
    background: #FFF; font-size: 0.9375rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--tinker-teal);
    box-shadow: 0 0 0 3px rgba(26, 175, 160, 0.15);
}
.form-input.error, .form-select.error, .form-textarea.error {
    border-color: var(--story-coral);
}
.form-textarea { height: auto; min-height: 100px; padding: 12px 16px; resize: vertical; }
.form-select { appearance: auto; cursor: pointer; }
.form-hint { font-size: 0.75rem; color: #999; margin-top: 4px; }
.form-error { font-size: 0.75rem; color: var(--story-coral); margin-top: 4px; }
.form-row { display: flex; gap: var(--space-2); }
.form-row > * { flex: 1; }
@media (max-width: 640px) { .form-row { flex-direction: column; } }

.checkbox-group, .radio-group { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.checkbox-group input, .radio-group input { width: 20px; height: 20px; accent-color: var(--tinker-teal); cursor: pointer; }
.checkbox-group label, .radio-group label { cursor: pointer; font-size: 0.875rem; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
    background: #FFF; border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm); overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: var(--shadow-md); }
.card-clickable:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); cursor: pointer; }
.card-img { width: 100%; height: 200px; object-fit: cover; }
.card-body { padding: var(--space-3); }
.card-title { font-size: 1.125rem; margin-bottom: var(--space-1); }
.card-text { font-size: 0.875rem; color: #666; }
.card-footer {
    padding: var(--space-2) var(--space-3);
    border-top: 1px solid var(--cloud-gray);
    display: flex; align-items: center; justify-content: space-between;
}
.card-flat { box-shadow: none; border: 1px solid var(--cloud-gray); }
.card-flat:hover { box-shadow: none; border-color: var(--tinker-teal); }

/* ============================================================
   BADGES & TAGS
   ============================================================ */
.badge {
    display: inline-flex; align-items: center; height: 24px; padding: 0 10px;
    font-size: 0.6875rem; font-weight: 700; border-radius: var(--radius-full);
    white-space: nowrap; text-transform: uppercase; letter-spacing: 0.3px;
}
.badge-teal { background: rgba(26,175,160,0.12); color: var(--tinker-teal); }
.badge-orange { background: rgba(244,123,32,0.12); color: var(--spark-orange); }
.badge-green { background: rgba(39,174,96,0.12); color: var(--leaf-green); }
.badge-red { background: rgba(232,97,77,0.12); color: var(--story-coral); }
.badge-navy { background: rgba(27,42,74,0.1); color: var(--deep-navy); }
.badge-gray { background: var(--cloud-gray); color: #666; }
.badge-blue { background: rgba(52,152,219,0.12); color: var(--sky-blue); }

/* ============================================================
   TABLES (data tables)
   ============================================================ */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
    text-align: left; padding: 10px 16px; font-size: 0.6875rem;
    font-weight: 700; color: #999; text-transform: uppercase;
    letter-spacing: 0.5px; border-bottom: 2px solid var(--cloud-gray);
    background: #FAFAFA; white-space: nowrap;
}
.data-table td {
    padding: 12px 16px; border-bottom: 1px solid var(--cloud-gray);
    font-size: 0.875rem; vertical-align: middle;
}
.data-table tbody tr:hover { background: rgba(26,175,160,0.04); }
.data-table .actions { white-space: nowrap; }
.data-table .actions .btn { margin-left: 4px; }
@media (max-width: 768px) {
    .table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
}

/* ============================================================
   MODAL
   ============================================================ */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(27,42,74,0.5);
    z-index: 1000; display: flex; align-items: center; justify-content: center;
    padding: var(--space-2); opacity: 0; visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s;
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
    background: #FFF; border-radius: var(--radius-lg); width: 100%; max-width: 560px;
    max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    transform: translateY(20px) scale(0.97);
    transition: transform 0.25s ease;
}
.modal-overlay.active .modal { transform: translateY(0) scale(1); }
.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: var(--space-3); border-bottom: 1px solid var(--cloud-gray);
}
.modal-header h3 { margin: 0; }
.modal-close {
    width: 36px; height: 36px; border-radius: var(--radius-full);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; cursor: pointer; color: #999;
    transition: background 0.2s;
}
.modal-close:hover { background: var(--cloud-gray); color: var(--charcoal); }
.modal-body { padding: var(--space-3); }
.modal-footer {
    padding: var(--space-2) var(--space-3);
    border-top: 1px solid var(--cloud-gray);
    display: flex; gap: var(--space-1); justify-content: flex-end;
}
.modal-lg { max-width: 760px; }

/* ============================================================
   TOAST NOTIFICATIONS
   ============================================================ */
.toast-container {
    position: fixed; top: 20px; right: 20px; z-index: 9999;
    display: flex; flex-direction: column; gap: 8px;
    pointer-events: none;
}
@media (max-width: 640px) {
    .toast-container { top: auto; bottom: calc(var(--bottom-nav-height) + 12px); right: 12px; left: 12px; }
}
.toast {
    background: #FFF; border-radius: var(--radius-md);
    padding: 14px 20px; box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    display: flex; align-items: center; gap: 12px;
    font-size: 0.875rem; font-weight: 600; pointer-events: auto;
    animation: toastSlide 0.35s ease;
    border-left: 4px solid var(--tinker-teal);
    max-width: 380px;
}
.toast.toast-success { border-left-color: var(--leaf-green); }
.toast.toast-error { border-left-color: var(--story-coral); }
.toast.toast-warning { border-left-color: var(--spark-orange); }
.toast.toast-info { border-left-color: var(--sky-blue); }
.toast-icon { font-size: 1.25rem; flex-shrink: 0; }
.toast-close { margin-left: auto; cursor: pointer; opacity: 0.5; font-size: 1.125rem; }
.toast-close:hover { opacity: 1; }
@keyframes toastSlide {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
.toast.removing {
    animation: toastFade 0.25s ease forwards;
}
@keyframes toastFade {
    to { transform: translateX(100%); opacity: 0; }
}

/* ============================================================
   EMPTY STATE
   ============================================================ */
.empty-state {
    text-align: center; padding: var(--space-8) var(--space-3);
    color: #999;
}
.empty-state .icon { font-size: 3rem; margin-bottom: var(--space-2); opacity: 0.5; }
.empty-state h3 { color: var(--charcoal); margin-bottom: var(--space-1); }
.empty-state p { font-size: 0.875rem; max-width: 360px; margin: 0 auto var(--space-3); }

/* ============================================================
   LOADING SPINNER
   ============================================================ */
.spinner {
    width: 28px; height: 28px; border: 3px solid var(--cloud-gray);
    border-top-color: var(--tinker-teal); border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
.spinner-sm { width: 18px; height: 18px; border-width: 2px; }
.spinner-lg { width: 40px; height: 40px; border-width: 4px; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-overlay {
    position: absolute; inset: 0; background: rgba(255,255,255,0.8);
    display: flex; align-items: center; justify-content: center; z-index: 10;
    border-radius: inherit;
}

/* ============================================================
   TABS
   ============================================================ */
.tabs {
    display: flex; gap: 0; border-bottom: 2px solid var(--cloud-gray);
    overflow-x: auto; -webkit-overflow-scrolling: touch;
}
.tab {
    padding: 12px 20px; font-size: 0.875rem; font-weight: 700;
    color: #999; cursor: pointer; white-space: nowrap;
    border-bottom: 3px solid transparent; margin-bottom: -2px;
    transition: color 0.2s, border-color 0.2s;
}
.tab:hover { color: var(--charcoal); }
.tab.active { color: var(--tinker-teal); border-bottom-color: var(--tinker-teal); }
.tab-content { display: none; padding: var(--space-3) 0; }
.tab-content.active { display: block; }

/* ============================================================
   PAGINATION
   ============================================================ */
.pagination { display: flex; align-items: center; justify-content: center; gap: 4px; margin-top: var(--space-3); }
.pagination .page-btn {
    width: 36px; height: 36px; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    font-size: 0.875rem; font-weight: 600; cursor: pointer;
    color: var(--charcoal); transition: all 0.2s;
}
.pagination .page-btn:hover { background: var(--cloud-gray); }
.pagination .page-btn.active { background: var(--tinker-teal); color: #FFF; }
.pagination .page-btn:disabled { opacity: 0.3; cursor: default; }

/* ============================================================
   AVATAR
   ============================================================ */
.avatar {
    width: 40px; height: 40px; border-radius: var(--radius-full);
    object-fit: cover; background: var(--cloud-gray);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: #FFF; font-size: 0.875rem;
    flex-shrink: 0;
}
.avatar-sm { width: 32px; height: 32px; font-size: 0.75rem; }
.avatar-lg { width: 56px; height: 56px; font-size: 1.125rem; }
.avatar-xl { width: 80px; height: 80px; font-size: 1.5rem; }
.avatar-teal { background: var(--tinker-teal); }
.avatar-orange { background: var(--spark-orange); }
.avatar-navy { background: var(--deep-navy); }

/* ============================================================
   PRICE TAG
   ============================================================ */
.price { font-family: 'Quicksand', sans-serif; font-weight: 700; color: var(--tinker-teal); }
.price-lg { font-size: 1.5rem; }
.price-old { text-decoration: line-through; color: #999; font-weight: 400; font-size: 0.875rem; }

/* ============================================================
   ALERT / INFO BOX
   ============================================================ */
.alert {
    padding: 14px 20px; border-radius: var(--radius-md); font-size: 0.875rem;
    display: flex; align-items: flex-start; gap: 12px; margin-bottom: var(--space-2);
}
.alert-info { background: rgba(52,152,219,0.1); color: #2980B9; border-left: 3px solid var(--sky-blue); }
.alert-success { background: rgba(39,174,96,0.1); color: #1e8449; border-left: 3px solid var(--leaf-green); }
.alert-warning { background: var(--soft-cream); color: #b7790a; border-left: 3px solid var(--spark-orange); }
.alert-danger { background: rgba(232,97,77,0.1); color: #c0392b; border-left: 3px solid var(--story-coral); }

/* ============================================================
   STAT CARD
   ============================================================ */
.stat-card {
    background: #FFF; border-radius: var(--radius-lg); padding: var(--space-3);
    box-shadow: var(--shadow-sm); border-left: 4px solid var(--tinker-teal);
}
.stat-card .stat-label { font-size: 0.75rem; color: #999; text-transform: uppercase; font-weight: 700; letter-spacing: 0.5px; }
.stat-card .stat-value { font-size: 1.75rem; font-weight: 800; color: var(--deep-navy); margin: 4px 0; font-family: 'Quicksand', sans-serif; }
.stat-card .stat-hint { font-size: 0.75rem; color: #999; }
.stat-card.stat-orange { border-left-color: var(--spark-orange); }
.stat-card.stat-green { border-left-color: var(--leaf-green); }
.stat-card.stat-red { border-left-color: var(--story-coral); }
.stat-card.stat-navy { border-left-color: var(--deep-navy); }

/* ============================================================
   SECTION SPACING (public site)
   ============================================================ */
.section { padding: var(--space-8) 0; }
.section-teal { background: var(--tinker-teal); color: #FFF; }
.section-teal h2, .section-teal h3 { color: #FFF; }
.section-navy { background: var(--deep-navy); color: #FFF; }
.section-navy h2, .section-navy h3 { color: #FFF; }
.section-cream { background: var(--soft-cream); }
.section-gray { background: var(--cloud-gray); }
.section-header { text-align: center; max-width: 640px; margin: 0 auto var(--space-5); }
.section-header p { color: #666; margin-top: var(--space-1); }

/* ============================================================
   PAGE HEADER (authenticated pages)
   ============================================================ */
.page-header {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: var(--space-2);
    margin-bottom: var(--space-3);
}
.page-header h1 { font-size: 1.5rem; }
.page-header .actions { display: flex; gap: var(--space-1); }

/* ============================================================
   DROPDOWN
   ============================================================ */
.dropdown { position: relative; }
.dropdown-menu {
    position: absolute; top: calc(100% + 4px); right: 0;
    background: #FFF; border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15); min-width: 200px;
    z-index: 500; opacity: 0; visibility: hidden;
    transform: translateY(-8px); transition: all 0.2s;
    overflow: hidden;
}
.dropdown.open .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 16px; font-size: 0.875rem; cursor: pointer;
    transition: background 0.15s; color: var(--charcoal);
}
.dropdown-item:hover { background: var(--cloud-gray); }
.dropdown-divider { height: 1px; background: var(--cloud-gray); }

/* ============================================================
   SEARCH BAR
   ============================================================ */
.search-bar {
    position: relative; width: 100%; max-width: 400px;
}
.search-bar input {
    width: 100%; height: 44px; padding: 0 16px 0 44px;
    border: 2px solid var(--cloud-gray); border-radius: var(--radius-full);
    background: #FFF; font-size: 0.875rem;
    transition: border-color 0.2s;
}
.search-bar input:focus { border-color: var(--tinker-teal); }
.search-bar .search-icon {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: #999; font-size: 1rem; pointer-events: none;
}

/* ============================================================
   MOBILE BOTTOM NAV (parent/teacher portals)
   ============================================================ */
.bottom-nav {
    position: fixed; bottom: 0; left: 0; right: 0;
    height: var(--bottom-nav-height); background: #FFF;
    border-top: 1px solid var(--cloud-gray);
    display: flex; align-items: stretch; z-index: 100;
    box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
}
.bottom-nav .nav-item {
    flex: 1; display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 2px;
    color: #999; font-size: 0.625rem; font-weight: 700;
    text-decoration: none; transition: color 0.2s;
    position: relative;
}
.bottom-nav .nav-item .nav-icon { font-size: 1.375rem; }
.bottom-nav .nav-item.active { color: var(--tinker-teal); }
.bottom-nav .nav-item .nav-badge {
    position: absolute; top: 6px; right: calc(50% - 20px);
    width: 18px; height: 18px; border-radius: 50%;
    background: var(--story-coral); color: #FFF;
    font-size: 0.5625rem; display: flex; align-items: center; justify-content: center;
}
/* Page padding to account for bottom nav */
.has-bottom-nav { padding-bottom: calc(var(--bottom-nav-height) + var(--space-3)); }

@media (min-width: 769px) {
    .bottom-nav { display: none; }
    .has-bottom-nav { padding-bottom: 0; }
}

/* ============================================================
   NAIRA HIGHLIGHT
   ============================================================ */
.naira { font-family: 'Quicksand', sans-serif; }

/* ============================================================
   ANIMATIONS
   ============================================================ */
.fade-in { animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.slide-up { animation: slideUp 0.4s ease; }
@keyframes slideUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* ============================================================
   PRINT
   ============================================================ */
@media print {
    .no-print { display: none !important; }
    body { background: #FFF; }
    .card { box-shadow: none; border: 1px solid #DDD; }
}