/* Plan 006: components/overlays.css — Fixed layers, backdrops, and dialog motion
   Extracted from frontend/styles.css on 2026-04-03 */

/* ── Confirm modal ── */
.ui-confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.42);
    z-index: calc(var(--z-modal) - 1);
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease;
}

.ui-confirm-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}

.ui-confirm-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -46%);
    opacity: 0;
    pointer-events: none;
    width: min(380px, calc(100vw - 32px));
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-default);
    box-shadow: var(--shadow-xl);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    z-index: var(--z-modal);
    transition: transform 160ms ease, opacity 160ms ease;
}

.ui-confirm-dialog.is-open {
    transform: translate(-50%, -50%);
    opacity: 1;
    pointer-events: auto;
}

.ui-confirm-title {
    margin: 0;
    font-size: var(--text-body);
    font-weight: var(--weight-bold);
    color: var(--fg-primary);
    font-family: var(--font-headline);
}

.ui-confirm-message {
    margin: 0;
    font-size: var(--text-sm);
    color: var(--fg-secondary);
}

.ui-confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.ui-confirm-cancel-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--bg-surface-alt);
    color: var(--fg-primary);
    border: 1px solid var(--border-default);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    font-family: var(--font-body);
    cursor: pointer;
    transition: background 120ms ease;
}

.ui-confirm-cancel-btn:hover { background: var(--color-neutral-200); }

.ui-confirm-confirm-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--color-danger);
    color: var(--color-white);
    border: none;
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    font-family: var(--font-body);
    cursor: pointer;
    transition: opacity 120ms ease;
}

.ui-confirm-confirm-btn:hover { opacity: 0.88; }

/* ── Settings layer — Account section forms ── */
.settings-action-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--bg-surface);
    color: var(--fg-primary);
    border: 1px solid var(--border-default);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    font-family: var(--font-body);
    cursor: pointer;
    text-align: left;
    transition: background 120ms ease;
}

.settings-action-btn:hover { background: var(--color-neutral-100); }

.account-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) 0 var(--space-1);
}

.account-form-label {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--fg-secondary);
}

.account-form-input {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-family: var(--font-body);
    color: var(--fg-primary);
    background: var(--bg-surface);
    box-sizing: border-box;
    transition: border-color 120ms ease, box-shadow 120ms ease;
}

.account-form-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: var(--shadow-focus);
}

.account-form-error {
    margin: 0;
    font-size: var(--text-xs);
    color: var(--fg-danger);
}

.account-form-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
    margin-top: var(--space-1);
}

.settings-cancel-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--bg-surface-alt);
    color: var(--fg-primary);
    border: 1px solid var(--border-default);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    font-family: var(--font-body);
    cursor: pointer;
    transition: background 120ms ease;
}

.settings-cancel-btn:hover { background: var(--color-neutral-200); }

.settings-submit-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--primary);
    color: var(--color-white);
    border: none;
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    font-family: var(--font-body);
    cursor: pointer;
    transition: opacity 120ms ease;
}

.settings-submit-btn:hover { opacity: 0.88; }
.settings-submit-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Settings layer ── */
body.settings-layer-open {
    overflow: hidden;
}

.settings-layer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.42);
    opacity: 0;
    transition: opacity var(--settings-layer-duration-ms) var(--settings-layer-ease);
    z-index: calc(var(--z-settings) - 1);
}

.settings-layer-overlay.is-open {
    opacity: 1;
}

.settings-layer {
    position: fixed;
    left: 50%;
    bottom: 0;
    width: min(760px, calc(100vw - 24px));
    max-height: min(78vh, 760px);
    transform: translate(-50%, 110%);
    opacity: 0;
    background: #ffffff;
    border-radius: 16px 16px 0 0;
    border: 1px solid var(--border-default);
    box-shadow: 0 -16px 40px rgba(15, 23, 42, 0.18);
    transition:
        transform var(--settings-layer-duration-ms) var(--settings-layer-ease),
        opacity var(--settings-layer-duration-ms) var(--settings-layer-ease);
    z-index: var(--z-settings);
    display: flex;
    flex-direction: column;
}

.settings-layer.is-open {
    transform: translate(-50%, 0);
    opacity: 1;
}

.settings-layer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 16px 18px;
    border-bottom: 1px solid var(--border-default);
}

.settings-layer-head h2 {
    margin: 0;
    font-size: var(--text-h2);
    color: var(--fg-primary);
}

.settings-layer-close {
    width: auto;
    margin: 0;
    padding: 4px 10px;
    font-size: 24px;
    line-height: 1;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    background: var(--bg-surface-alt);
    color: var(--fg-secondary);
}

.settings-layer-close:hover {
    background: var(--bg-surface-alt);
}

.settings-layer-content {
    overflow-y: auto;
    padding: 16px 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.settings-layer-section {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 12px;
    border-radius: 10px;
    background: var(--bg-surface-alt);
    border: 1px solid var(--border-default);
}

.settings-layer-section h3 {
    margin: 0;
    font-size: var(--text-body);
    color: var(--fg-primary);
}

/* ── Stage rubric modal ── */
.stage-rubric-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.42);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms cubic-bezier(0.2, 0.9, 0.3, 1);
    z-index: calc(var(--z-modal) - 1);
}

.stage-rubric-modal-overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}

.stage-rubric-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    width: min(1290px, calc(100vw - 32px));
    max-height: min(84vh, 1290px);
    transform: translate(-50%, -48%);
    opacity: 0;
    pointer-events: none;
    background: #ffffff;
    border: 1px solid var(--border-default);
    border-radius: 14px;
    box-shadow: 0 22px 48px rgba(15, 23, 42, 0.24);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    transition:
        transform 220ms cubic-bezier(0.2, 0.9, 0.3, 1),
        opacity 220ms cubic-bezier(0.2, 0.9, 0.3, 1);
}

.stage-rubric-modal.is-open {
    transform: translate(-50%, -50%);
    opacity: 1;
    pointer-events: auto;
}

body.stage-rubric-open {
    overflow: hidden;
}

.stage-rubric-modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 21px 24px;
    border-bottom: 1px solid var(--border-default);
}

.stage-rubric-modal-head h3 {
    margin: 0;
    font-size: var(--text-h1);
    color: var(--fg-primary);
}

.stage-rubric-modal-close {
    width: auto;
    min-width: 50px;
    height: 50px;
    margin: 0;
    padding: 0;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    background: var(--bg-surface-alt);
    color: var(--fg-secondary);
    font-size: 28px;
    line-height: 1;
}

.stage-rubric-modal-close:hover {
    background: var(--bg-surface-alt);
}

.stage-rubric-modal-body {
    padding: 18px 24px 24px;
    overflow-y: auto;
}

.stage-rubric-modal-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.stage-rubric-option {
    width: 100%;
    margin: 0;
    padding: 18px 20px;
    border-left: 5px solid #ccc;
    border-top: 1px solid #dde7e0;
    border-right: 1px solid #dde7e0;
    border-bottom: 1px solid #dde7e0;
    border-radius: 10px;
    background: #f8fbf9;
    color: #1f2937;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: all 160ms ease;
}

.stage-rubric-option:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.stage-rubric-option[data-level="1"] {
    border-left-color: #ef4444;
    background: #fef2f2;
}

.stage-rubric-option[data-level="2"] {
    border-left-color: #f97316;
    background: #fff7ed;
}

.stage-rubric-option[data-level="3"] {
    border-left-color: #eab308;
    background: #fefce8;
}

.stage-rubric-option[data-level="4"] {
    border-left-color: #22c55e;
    background: #f0fdf4;
}

.stage-rubric-option[data-level="5"] {
    border-left-color: #16a34a;
    background: #dcfce7;
}

.stage-rubric-option strong {
    color: #143a28;
    font-size: 16px;
}

.stage-rubric-option span {
    line-height: 1.4;
}

.stage-rubric-option[data-level="1"]:hover {
    background: #fee2e2;
    border-left-color: #dc2626;
}

.stage-rubric-option[data-level="2"]:hover {
    background: #ffedd5;
    border-left-color: #ea580c;
}

.stage-rubric-option[data-level="3"]:hover {
    background: #fef9c3;
    border-left-color: #ca8a04;
}

.stage-rubric-option[data-level="4"]:hover {
    background: #c7f0d8;
    border-left-color: #16a34a;
}

.stage-rubric-option[data-level="5"]:hover {
    background: #bbf7d0;
    border-left-color: #15803d;
}

/* ── Generic modal, slide-right modal, add-session modal ── */

.modal-overlay.is-open {
    display: block;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    padding: 20px;
    border-radius: 6px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: min(800px, 90vw);
    max-height: 90vh;
    overflow-y: auto;
    display: none;
    z-index: var(--z-modal);
}

.modal.is-open {
    display: block;
}


.modal-slide-right.is-open {
    transform: translateX(0);
    opacity: 1;
}

body.student-modal-open {
    overflow: hidden;
}

.modal h3 {
    margin-top: 0;
}


/* ── Create Classroom Modal ─────────────────────────────────── */

body.classroom-modal-open {
    overflow: hidden;
}

.classroom-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    z-index: calc(var(--z-modal) - 1);
}

.classroom-modal-dialog {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 640px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    z-index: var(--z-modal);
}

.classroom-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-6) var(--space-4);
    border-bottom: 1px solid var(--border-default);
    flex-shrink: 0;
}

.classroom-modal-title {
    margin: 0;
    font-size: var(--text-body);
    font-weight: var(--weight-bold);
    color: var(--fg-primary);
    letter-spacing: -0.01em;
}

.classroom-modal-close-btn {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    background: var(--color-neutral-100);
    border: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-neutral-600);
    font-size: var(--text-lg);
    line-height: 1;
    transition: var(--transition-fast);
}
.classroom-modal-close-btn:hover { background: var(--color-neutral-200); }

.classroom-modal-body {
    padding: var(--space-5) var(--space-6);
    overflow-y: auto;
    flex: 1;
}

.classroom-modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-default);
    flex-shrink: 0;
}

.classroom-modal-footer--confirm {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-6);
    background: var(--bg-surface-alt);
    border-top: 1px solid var(--border-default);
    flex-shrink: 0;
}
.classroom-modal-footer--confirm[hidden] { display: none; }

.classroom-modal-confirm-text {
    flex: 1;
    margin: 0;
    font-size: var(--text-sm);
    color: var(--fg-secondary);
}

.classroom-modal-discard-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--color-danger);
    color: #fff;
    border: none;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: var(--transition-fast);
}
.classroom-modal-discard-btn:hover { opacity: 0.88; }

@media (max-width: 600px) {
    .classroom-modal-overlay { padding: var(--space-4); align-items: flex-end; }
    .classroom-modal-footer { flex-direction: column-reverse; gap: var(--space-2); }
    .classroom-modal-footer--confirm { flex-direction: column; align-items: flex-start; }
}