/* =====================================================================
   AXIOMA — DESIGN SYSTEM
   Shared design tokens + base styles + reusable components.
   Loaded once, sitewide, from header.php. Layers on top of Bootstrap 5
   (overrides Bootstrap's own CSS variables so existing .btn/.card/etc.
   markup picks up the new look for free) and keeps every class that
   legacy pages already depend on (student-item, page-link, ...).
   ===================================================================== */

:root {
    /* ---- Brand / semantic colors ---- */
    --ax-primary-50:  #eef4ff;
    --ax-primary-100: #dbe7fe;
    --ax-primary-400: #4b83e0;
    --ax-primary:     #1b5cbf;
    --ax-primary-600: #164f9c;
    --ax-primary-700: #0f3a75;
    --ax-primary-900: #003a7a;

    --ax-success: #1aa261;
    --ax-success-bg: #e8f8f0;
    --ax-danger:  #e5484d;
    --ax-danger-bg: #fdecea;
    --ax-warning: #d98c1a;
    --ax-warning-bg: #fdf3e3;
    --ax-info:    #2f8fd6;
    --ax-info-bg: #e9f4fd;

    /* ---- Neutrals ---- */
    --ax-gray-50:  #f7f9fc;
    --ax-gray-100: #eef1f6;
    --ax-gray-200: #e4e8ef;
    --ax-gray-300: #d3d9e3;
    --ax-gray-400: #aeb7c7;
    --ax-gray-500: #838da0;
    --ax-gray-600: #5c6579;
    --ax-gray-700: #3f4759;
    --ax-gray-800: #262c3b;
    --ax-gray-900: #171b26;

    --ax-bg:      #f4f6fb;
    --ax-surface: #ffffff;
    --ax-border:  var(--ax-gray-200);
    --ax-text:    var(--ax-gray-800);
    --ax-text-muted: var(--ax-gray-500);

    /* ---- Spacing scale ---- */
    --ax-space-1: 4px;
    --ax-space-2: 8px;
    --ax-space-3: 12px;
    --ax-space-4: 16px;
    --ax-space-5: 24px;
    --ax-space-6: 32px;

    /* ---- Radius / shadow ---- */
    --ax-radius-sm: 8px;
    --ax-radius: 12px;
    --ax-radius-lg: 16px;

    --ax-shadow-sm: 0 1px 2px rgba(23, 27, 38, 0.06), 0 1px 1px rgba(23, 27, 38, 0.04);
    --ax-shadow:    0 4px 12px rgba(23, 27, 38, 0.08), 0 1px 3px rgba(23, 27, 38, 0.06);
    --ax-shadow-lg: 0 12px 32px rgba(23, 27, 38, 0.12), 0 2px 6px rgba(23, 27, 38, 0.06);

    --ax-transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);

    --ax-font: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Arial, sans-serif;

    /* ---- Bootstrap 5 variable overrides (cascades to every page) ---- */
    --bs-primary: var(--ax-primary);
    --bs-primary-rgb: 27, 92, 191;
    --bs-success: var(--ax-success);
    --bs-success-rgb: 26, 162, 97;
    --bs-danger: var(--ax-danger);
    --bs-danger-rgb: 229, 72, 77;
    --bs-warning: var(--ax-warning);
    --bs-warning-rgb: 217, 140, 26;
    --bs-info: var(--ax-info);
    --bs-info-rgb: 47, 143, 214;
    --bs-body-font-family: var(--ax-font);
    --bs-body-color: var(--ax-text);
    --bs-body-bg: var(--ax-bg);
    --bs-border-radius: var(--ax-radius-sm);
    --bs-border-radius-lg: var(--ax-radius);
    --bs-border-radius-sm: 6px;
    --bs-border-color: var(--ax-border);
    --bs-link-color: var(--ax-primary);
    --bs-link-color-rgb: 27, 92, 191;
    --bs-link-hover-color: var(--ax-primary-600);
    --bs-link-hover-color-rgb: 22, 79, 156;
}

/* =====================================================================
   BASE
   ===================================================================== */

* { box-sizing: border-box; }

html {
    -webkit-text-size-adjust: 100%;
}

/* =====================================================================
   BOOTSTRAP COMPONENT RETINT
   Bootstrap 5.3's compiled CSS hardcodes literal hex colors into each
   component's *local* variables (e.g. .btn-primary{--bs-btn-bg:#0d6efd})
   rather than referencing the root --bs-primary variable, so overriding
   --bs-primary alone (above) does NOT retint buttons/badges. Utility
   classes (.bg-primary, .text-primary, .border-primary, .alert-primary)
   DO reference the root variables and pick up the override for free —
   this block only needs to patch the components that don't.
   ===================================================================== */

.btn-primary {
    --bs-btn-bg: var(--ax-primary);
    --bs-btn-border-color: var(--ax-primary);
    --bs-btn-hover-bg: var(--ax-primary-600);
    --bs-btn-hover-border-color: var(--ax-primary-600);
    --bs-btn-active-bg: var(--ax-primary-700);
    --bs-btn-active-border-color: var(--ax-primary-700);
    --bs-btn-disabled-bg: var(--ax-primary);
    --bs-btn-disabled-border-color: var(--ax-primary);
    --bs-btn-focus-shadow-rgb: 27, 92, 191;
}

.btn-outline-primary {
    --bs-btn-color: var(--ax-primary);
    --bs-btn-border-color: var(--ax-primary);
    --bs-btn-hover-bg: var(--ax-primary);
    --bs-btn-hover-border-color: var(--ax-primary);
    --bs-btn-active-bg: var(--ax-primary-600);
    --bs-btn-active-border-color: var(--ax-primary-600);
    --bs-btn-disabled-color: var(--ax-primary);
    --bs-btn-disabled-border-color: var(--ax-primary);
    --bs-btn-focus-shadow-rgb: 27, 92, 191;
}

.btn-success {
    --bs-btn-bg: var(--ax-success);
    --bs-btn-border-color: var(--ax-success);
    --bs-btn-hover-bg: color-mix(in srgb, var(--ax-success) 85%, black);
    --bs-btn-hover-border-color: color-mix(in srgb, var(--ax-success) 80%, black);
    --bs-btn-active-bg: color-mix(in srgb, var(--ax-success) 75%, black);
    --bs-btn-active-border-color: color-mix(in srgb, var(--ax-success) 70%, black);
    --bs-btn-disabled-bg: var(--ax-success);
    --bs-btn-disabled-border-color: var(--ax-success);
}

.btn-danger {
    --bs-btn-bg: var(--ax-danger);
    --bs-btn-border-color: var(--ax-danger);
    --bs-btn-hover-bg: color-mix(in srgb, var(--ax-danger) 85%, black);
    --bs-btn-hover-border-color: color-mix(in srgb, var(--ax-danger) 80%, black);
    --bs-btn-active-bg: color-mix(in srgb, var(--ax-danger) 75%, black);
    --bs-btn-active-border-color: color-mix(in srgb, var(--ax-danger) 70%, black);
    --bs-btn-disabled-bg: var(--ax-danger);
    --bs-btn-disabled-border-color: var(--ax-danger);
}

.btn-outline-danger {
    --bs-btn-color: var(--ax-danger);
    --bs-btn-border-color: var(--ax-danger);
    --bs-btn-hover-bg: var(--ax-danger);
    --bs-btn-hover-border-color: var(--ax-danger);
    --bs-btn-active-bg: color-mix(in srgb, var(--ax-danger) 85%, black);
    --bs-btn-active-border-color: color-mix(in srgb, var(--ax-danger) 80%, black);
    --bs-btn-disabled-color: var(--ax-danger);
    --bs-btn-disabled-border-color: var(--ax-danger);
}

.btn-warning {
    --bs-btn-bg: var(--ax-warning);
    --bs-btn-border-color: var(--ax-warning);
    --bs-btn-hover-bg: color-mix(in srgb, var(--ax-warning) 90%, black);
    --bs-btn-hover-border-color: color-mix(in srgb, var(--ax-warning) 85%, black);
    --bs-btn-active-bg: color-mix(in srgb, var(--ax-warning) 80%, black);
    --bs-btn-active-border-color: color-mix(in srgb, var(--ax-warning) 75%, black);
    --bs-btn-disabled-bg: var(--ax-warning);
    --bs-btn-disabled-border-color: var(--ax-warning);
}

.btn-info {
    --bs-btn-bg: var(--ax-info);
    --bs-btn-border-color: var(--ax-info);
    --bs-btn-color: #fff;
    --bs-btn-hover-color: #fff;
    --bs-btn-hover-bg: color-mix(in srgb, var(--ax-info) 85%, black);
    --bs-btn-hover-border-color: color-mix(in srgb, var(--ax-info) 80%, black);
    --bs-btn-active-color: #fff;
    --bs-btn-active-bg: color-mix(in srgb, var(--ax-info) 75%, black);
    --bs-btn-active-border-color: color-mix(in srgb, var(--ax-info) 70%, black);
    --bs-btn-disabled-bg: var(--ax-info);
    --bs-btn-disabled-border-color: var(--ax-info);
}

.pagination {
    --bs-pagination-active-bg: var(--ax-primary);
    --bs-pagination-active-border-color: var(--ax-primary);
    --bs-pagination-hover-bg: var(--ax-primary-50);
}

/* Primary's subtle/emphasis family feeds .alert-primary, .text-bg-primary
   variants, and light badges — reuse our own light/dark primary tokens
   so they stay coherent with the new brand blue. */
:root {
    --bs-primary-text-emphasis: var(--ax-primary-900);
    --bs-primary-bg-subtle: var(--ax-primary-50);
    --bs-primary-border-subtle: var(--ax-primary-100);
}

body {
    font-family: var(--ax-font);
    background-color: var(--ax-bg);
    color: var(--ax-text);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--ax-gray-900);
    font-weight: 600;
    letter-spacing: -0.01em;
}

h1 {
    text-align: left;
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
    text-align: left;
}

h3 {
    margin-top: var(--ax-space-5);
    font-size: 1.2rem;
}

p {
    color: var(--ax-text);
    text-align: left;
    font-size: 0.95em;
}

a {
    color: var(--ax-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--ax-transition);
}

a:hover {
    color: var(--ax-primary-600);
    text-decoration: underline;
}

/* Consistent focus ring across native controls */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--ax-primary-400);
    outline-offset: 2px;
}

::selection {
    background: var(--ax-primary-100);
}

/* =====================================================================
   GENERIC LIST (dashboard / group list items — index.php, groups.php)
   ===================================================================== */

ul {
    list-style-type: none;
    padding-left: 0;
}

/* Scoped to .list-group-item (not the bare <li> element) — this
   stylesheet is now loaded sitewide, and several pages use plain,
   unclassed <li> wrappers inside Bootstrap dropdown-menus. Styling
   the bare element would turn every dropdown item into a bordered
   card and break those menus. */
li.list-group-item {
    background-color: var(--ax-surface);
    border: 1px solid var(--ax-border);
    margin: var(--ax-space-2) 0;
    padding: var(--ax-space-4);
    border-radius: var(--ax-radius-sm);
    box-shadow: var(--ax-shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: box-shadow var(--ax-transition), transform var(--ax-transition), border-color var(--ax-transition);
}

li.list-group-item span {
    margin-left: auto;
    font-size: 0.9em;
    color: var(--ax-text-muted);
}

li.list-group-item:hover {
    box-shadow: var(--ax-shadow);
    border-color: var(--ax-gray-300);
}

/* =====================================================================
   BUTTONS / FORM CONTROLS (generic, non-Bootstrap-namespaced elements)
   ===================================================================== */

/* Plain, unclassed <button> elements (legacy pages without .btn).
   Deliberately does NOT set width — this stylesheet is now loaded
   sitewide and a global width:100% here would blow up every
   Bootstrap .btn (modals, tables, forms) across the whole app. */
button {
    padding: 10px 16px;
    font-size: 15px;
    background-color: var(--ax-primary);
    color: white;
    border: none;
    border-radius: var(--ax-radius-sm);
    cursor: pointer;
    transition: background-color var(--ax-transition), transform var(--ax-transition);
    font-weight: 600;
}

button:hover {
    background-color: var(--ax-primary-600);
}

button:active {
    transform: translateY(1px);
}

/* :not(.form-control) guard is required: attribute selectors match
   Bootstrap's .form-control specificity exactly, and since this
   stylesheet loads after Bootstrap it would otherwise win the cascade
   and squeeze/misalign virtually every form input in the app (nearly
   all of them carry .form-control). This only styles genuinely plain,
   unclassed inputs. */
input[type="text"]:not(.form-control), input[type="password"]:not(.form-control),
input[type="email"]:not(.form-control), input[type="date"]:not(.form-control) {
    width: 90%;
    padding: 10px 12px;
    margin: 10px 0;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    font-size: 1em;
    background: var(--ax-surface);
    transition: border-color var(--ax-transition), box-shadow var(--ax-transition);
}

input[type="text"]:not(.form-control):focus, input[type="password"]:not(.form-control):focus,
input[type="email"]:not(.form-control):focus {
    border-color: var(--ax-primary);
    outline: none;
    box-shadow: 0 0 0 3px var(--ax-primary-100);
}

/* Every real <select> in the app already carries Bootstrap's
   .form-select/.form-control (class specificity overrides this),
   so this only ever styles a genuinely unclassed, ad-hoc select. */
select {
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    background-color: var(--ax-gray-50);
    color: var(--ax-text);
    cursor: pointer;
    transition: all var(--ax-transition);
}

select:hover {
    border-color: var(--ax-primary);
    background-color: var(--ax-primary-50);
}

select:focus {
    outline: none;
    border-color: var(--ax-primary);
    background-color: var(--ax-surface);
    box-shadow: 0 0 0 3px var(--ax-primary-100);
}

/* =====================================================================
   ADD-STUDENT FAB
   ===================================================================== */

.add-student-button {
    position: fixed;
    right: 24px;
    bottom: 24px;
    background-color: var(--ax-primary);
    color: white;
    padding: 14px 24px;
    border-radius: 999px;
    text-decoration: none;
    font-size: 1.05em;
    font-weight: 600;
    box-shadow: var(--ax-shadow-lg);
    transition: transform var(--ax-transition), background-color var(--ax-transition);
    z-index: 500;
}

.add-student-button:hover {
    background-color: var(--ax-primary-600);
    transform: translateY(-2px);
    text-decoration: none;
    color: white;
}

/* =====================================================================
   SEARCH
   ===================================================================== */

.search-container {
    margin-bottom: var(--ax-space-5);
}

#searchForm {
    display: flex;
    flex-direction: column;
    gap: var(--ax-space-2);
}

#searchForm button {
    width: 100%;
    box-sizing: border-box;
}

#searchInput {
    padding: 10px 12px;
    font-size: 16px;
    border-radius: var(--ax-radius-sm);
    border: 1px solid var(--ax-border);
    width: 90%;
    box-sizing: border-box;
}

#searchInput:focus {
    border-color: var(--ax-primary);
    outline: none;
    box-shadow: 0 0 0 3px var(--ax-primary-100);
}

.student-result {
    padding: 10px 12px;
    background-color: var(--ax-gray-50);
    margin: 5px 0;
    border-radius: var(--ax-radius-sm);
    cursor: pointer;
    transition: background-color var(--ax-transition);
}

.student-result:hover {
    background-color: var(--ax-primary-50);
}

#searchResults .student-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    margin-bottom: 5px;
}

/* =====================================================================
   AUTH (login.php / change_password.php)
   ===================================================================== */

.logout-button button {
    background-color: var(--ax-danger);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--ax-radius-sm);
    cursor: pointer;
    font-size: 1em;
    width: auto;
}

.logout-button button:hover {
    background-color: #c73338;
}

.login {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.login-container {
    max-width: 400px;
    width: 70%;
    background-color: var(--ax-surface);
    text-align: center;
    align-items: center;
    padding: var(--ax-space-6);
    border-radius: var(--ax-radius-lg);
    box-sizing: border-box;
    box-shadow: var(--ax-shadow-lg);
}

.login-container button {
    width: 100%;
    height: 44px;
}

.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.journal-link {
    font-size: 16px;
    color: var(--ax-primary);
    text-decoration: none;
}

.journal-link:hover {
    text-decoration: underline;
}

/* =====================================================================
   STUDENT LIST ROW (students.php, rec_students_list.php, journal views)
   ===================================================================== */

.student-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--ax-space-2);
    padding: var(--ax-space-3) var(--ax-space-4);
    background: var(--ax-surface);
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    box-shadow: var(--ax-shadow-sm);
    flex-wrap: nowrap;
    transition: box-shadow var(--ax-transition);
}

.student-item:hover {
    box-shadow: var(--ax-shadow);
}

.student-name {
    font-family: var(--ax-font);
    font-size: 16px;
    color: var(--ax-text);
    font-weight: 600;
}

.student-checkbox {
    margin-left: auto;
    transform: scale(1.4);
    cursor: pointer;
    accent-color: var(--ax-primary);
}

.student-info {
    display: flex;
    align-items: center;
    gap: var(--ax-space-4);
}

.student-details {
    display: flex;
    gap: var(--ax-space-4);
    align-items: center;
    justify-content: space-between;
    padding: var(--ax-space-2) 0;
}

.student-details label {
    margin: 0;
    display: flex;
    align-items: center;
    font-size: 14px;
    color: var(--ax-text-muted);
    gap: 6px;
}

.comment, .kr-score, .dz-score {
    width: 80px;
    padding: 6px;
}

.remove-button {
    background: none;
    border: none;
    color: var(--ax-gray-400);
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    transition: color var(--ax-transition);
}

.remove-button:hover {
    color: var(--ax-danger);
}

/* =====================================================================
   PAGINATION
   ===================================================================== */

.pagination {
    margin-top: var(--ax-space-5);
    text-align: center;
}

.page-link {
    margin: 0 4px;
    padding: 6px 12px;
    text-decoration: none;
    color: var(--ax-primary);
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    transition: background-color var(--ax-transition), color var(--ax-transition), border-color var(--ax-transition);
    display: inline-block;
}

.page-link.active {
    background-color: var(--ax-primary);
    color: white;
    border-color: var(--ax-primary);
}

.page-link:hover {
    background-color: var(--ax-primary-50);
    text-decoration: none;
}

/* =====================================================================
   DATE FILTERS
   ===================================================================== */

.date-filters {
    margin-top: var(--ax-space-3);
    margin-bottom: var(--ax-space-3);
    display: flex;
    gap: var(--ax-space-5);
    align-items: center;
    flex-wrap: wrap;
}

.date-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--ax-space-2);
    padding: 10px 12px;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    cursor: pointer;
    background-color: var(--ax-surface);
    transition: background-color var(--ax-transition), box-shadow var(--ax-transition);
}

.date-input-wrapper:hover {
    background-color: var(--ax-gray-50);
    box-shadow: var(--ax-shadow-sm);
}

.date-input-wrapper input[type="date"] {
    border: none;
    background: transparent;
    outline: none;
    cursor: pointer;
    width: auto;
    margin: 0;
}

/* =====================================================================
   REUSABLE COMPONENTS (for upcoming page-by-page rollout)
   ===================================================================== */

.ax-page-header {
    display: flex;
    flex-wrap: wrap;
    gap: var(--ax-space-3);
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--ax-space-5);
}

.ax-page-header h1,
.ax-page-header h2 {
    margin: 0;
}

.ax-card {
    background: var(--ax-surface);
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius);
    box-shadow: var(--ax-shadow-sm);
    padding: var(--ax-space-5);
}

.ax-stat-tile {
    background: var(--ax-surface);
    border: 1px solid var(--ax-border);
    border-left: 3px solid var(--ax-primary);
    border-radius: var(--ax-radius);
    box-shadow: var(--ax-shadow-sm);
    padding: var(--ax-space-4) var(--ax-space-5);
    display: flex;
    align-items: center;
    gap: var(--ax-space-4);
    transition: box-shadow var(--ax-transition), transform var(--ax-transition);
    text-decoration: none;
    height: 100%;
}

.ax-stat-tile:hover {
    box-shadow: var(--ax-shadow);
    transform: translateY(-2px);
    text-decoration: none;
}

.ax-stat-tile--warning { border-left-color: var(--ax-warning); }
.ax-stat-tile--info { border-left-color: var(--ax-info); }
.ax-stat-tile--success { border-left-color: var(--ax-success); }
.ax-stat-tile--danger { border-left-color: var(--ax-danger); }

.ax-stat-tile .ax-stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--ax-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
    background: var(--ax-primary-50);
    color: var(--ax-primary);
}

.ax-stat-tile--warning .ax-stat-icon { background: var(--ax-warning-bg); color: var(--ax-warning); }
.ax-stat-tile--info .ax-stat-icon { background: var(--ax-info-bg); color: var(--ax-info); }
.ax-stat-tile--success .ax-stat-icon { background: var(--ax-success-bg); color: var(--ax-success); }
.ax-stat-tile--danger .ax-stat-icon { background: var(--ax-danger-bg); color: var(--ax-danger); }

.ax-stat-tile .ax-stat-body {
    min-width: 0;
}

.ax-stat-tile .ax-stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--ax-gray-900);
    line-height: 1.2;
}

.ax-stat-tile .ax-stat-label {
    color: var(--ax-text-muted);
    font-size: 0.85rem;
    margin-top: 2px;
}

.ax-stat-tile--primary { border-left-color: var(--ax-primary); }
.ax-stat-tile--primary .ax-stat-icon { background: var(--ax-primary-50); color: var(--ax-primary); }

.widget-drag-handle {
    cursor: grab;
    color: var(--ax-text-muted);
    flex-shrink: 0;
}

.widget-drag-handle:active {
    cursor: grabbing;
}

.widget-hide-btn {
    border: none;
    background: transparent;
    color: var(--ax-text-muted);
    flex-shrink: 0;
    padding: 4px;
    border-radius: var(--ax-radius);
}

.widget-hide-btn:hover {
    color: var(--ax-danger);
    background: var(--ax-danger-bg);
}

.sortable-ghost {
    opacity: 0.4;
}

/* Bootstrap's own .table-responsive only sets overflow-x:auto — adding
   a border/radius/shadow here gives every table across the app (17
   files already use this class) the same polished container for free.
   overflow-y is capped/scrollable (not just x) so thead can go sticky
   below — position:sticky never escapes an ancestor whose overflow is
   anything but visible on BOTH axes, so leaving overflow-y at its
   default (which Bootstrap's overflow-x:auto silently coerces to auto
   anyway, per the CSS overflow spec) trapped sticky against a container
   that never actually scrolled. Bounding the height here makes it a
   real scroll box, which is what sticky needs.
   overflow:auto (not hidden) + Bootstrap dropdowns' own Popper flip
   logic keeps row-action dropdown-menus from being clipped — verified
   against student/index.php's per-row dropdown, the one page that
   combines this container with one. */
.table-responsive {
    max-height: 70vh;
    overflow: auto;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius-sm);
    background: var(--ax-surface);
}

.table-responsive .table {
    margin-bottom: 0;
}

.table-responsive thead th {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--ax-surface);
    box-shadow: 0 1px 0 var(--ax-border);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--ax-gray-600);
}

.ax-table-responsive {
    width: 100%;
    max-height: 70vh;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid var(--ax-border);
    border-radius: var(--ax-radius);
    background: var(--ax-surface);
}

.ax-table-responsive table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
}

.ax-table-responsive th {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--ax-gray-50);
    box-shadow: 0 1px 0 var(--ax-border);
    color: var(--ax-gray-700);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    text-align: left;
    padding: var(--ax-space-3) var(--ax-space-4);
    white-space: nowrap;
}

.ax-table-responsive td {
    padding: var(--ax-space-3) var(--ax-space-4);
    border-top: 1px solid var(--ax-border);
}

.ax-table-responsive tr:hover td {
    background: var(--ax-gray-50);
}

.ax-empty-state {
    text-align: center;
    padding: var(--ax-space-6) var(--ax-space-4);
    color: var(--ax-text-muted);
}

/* =====================================================================
   RESPONSIVE — standardized on Bootstrap's breakpoint scale
   ===================================================================== */

/* Tablet and down (< 992px) */
@media (max-width: 991.98px) {
    h1, h2, h3 {
        font-size: 1.4em;
    }
}

/* Small tablet and down (< 768px) */
@media (max-width: 767.98px) {
    h1, h2, h3 {
        text-align: center;
    }

    .add-student-button {
        right: 12px;
        bottom: 12px;
        padding: 12px 18px;
        font-size: 1em;
    }

    li.list-group-item {
        flex-direction: column;
        align-items: flex-start;
    }

    li.list-group-item span {
        margin-left: 0;
        margin-top: 5px;
    }

    .student-details {
        flex-direction: column;
        align-items: stretch;
        gap: var(--ax-space-2);
    }

    .login-container {
        max-width: 90%;
        width: 90%;
        padding: var(--ax-space-5);
        margin: 0 var(--ax-space-3);
    }

    .logout-button {
        margin: var(--ax-space-2) 0;
    }

    input[type="text"]:not(.form-control), input[type="password"]:not(.form-control), #searchInput {
        width: 100%;
        font-size: 16px; /* prevents iOS zoom-on-focus */
    }

    .form-control, .form-select {
        font-size: 16px; /* prevents iOS zoom-on-focus, applies to real Bootstrap inputs too */
    }

    button {
        font-size: 15px;
        padding: 10px;
    }

    select {
        width: 100%;
    }

    .pagination {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 5px;
    }

    .date-filters {
        flex-direction: column;
        align-items: stretch;
        gap: var(--ax-space-2);
    }

    .student-item {
        flex-direction: row;
        flex-wrap: nowrap;
        justify-content: space-between;
    }

    .student-info {
        justify-content: space-between;
        flex-wrap: nowrap;
    }

    .ax-page-header {
        flex-direction: column;
        align-items: stretch;
    }
}

/* Phones (< 576px) */
@media (max-width: 575.98px) {
    h1, h2 {
        font-size: 1.2em;
    }

    .add-student-button {
        font-size: 0.9em;
        padding: 10px 14px;
    }

    li.list-group-item {
        padding: var(--ax-space-3);
    }

    .student-details {
        padding: var(--ax-space-2) 0;
    }

    .login-container {
        padding: var(--ax-space-4);
    }

    select {
        font-size: 13px;
    }

    .page-link {
        font-size: 13px;
        padding: 6px 10px;
    }

    .student-item {
        padding: var(--ax-space-2);
        margin-bottom: var(--ax-space-2);
    }

    .kr-score, .dz-score {
        font-size: 13px;
    }

    .student-name {
        font-size: 15px;
    }

    .remove-button {
        font-size: 18px;
    }
}