/**
 * English Mastery Hub — Opt-in Design System
 *
 * Safety contract:
 * - No global element selectors.
 * - No existing component classes are redefined.
 * - Tokens and primitives apply only inside `.emh-ds-scope`.
 * - Pages migrate explicitly, one component at a time.
 */

.emh-ds-scope {
    --emh-ds-surface: #1f1f1f;
    --emh-ds-surface-raised: #272727;
    --emh-ds-border: rgba(255, 255, 255, 0.09);
    --emh-ds-border-strong: rgba(255, 255, 255, 0.16);
    --emh-ds-text: #ffffff;
    --emh-ds-text-muted: #a3a3a3;
    --emh-ds-primary: #38bdf8;
    --emh-ds-primary-strong: #0284c7;
    --emh-ds-focus: #7dd3fc;
    --emh-ds-radius-sm: 8px;
    --emh-ds-radius-md: 12px;
    --emh-ds-radius-lg: 20px;
    --emh-ds-space-1: 4px;
    --emh-ds-space-2: 8px;
    --emh-ds-space-3: 12px;
    --emh-ds-space-4: 16px;
    --emh-ds-space-5: 20px;
    --emh-ds-space-6: 24px;
    --emh-ds-space-8: 32px;
    --emh-ds-duration-fast: 120ms;
    --emh-ds-duration-normal: 200ms;
    --emh-ds-ease: cubic-bezier(0.2, 0, 0, 1);
}

:root[data-theme="light"] .emh-ds-scope {
    --emh-ds-surface: #ffffff;
    --emh-ds-surface-raised: #f8fafc;
    --emh-ds-border: #e2e8f0;
    --emh-ds-border-strong: #cbd5e1;
    --emh-ds-text: #0f172a;
    --emh-ds-text-muted: #475569;
    --emh-ds-primary: #0284c7;
    --emh-ds-primary-strong: #0369a1;
    --emh-ds-focus: #0369a1;
}

.emh-ds-card {
    position: relative;
    overflow: hidden;
    color: var(--emh-ds-text);
    background: linear-gradient(135deg, var(--emh-ds-surface), var(--emh-ds-surface-raised));
    border: 1px solid var(--emh-ds-border);
    border-radius: var(--emh-ds-radius-lg);
}

.emh-ds-card-decoration {
    position: absolute;
    top: -50px;
    right: -50px;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.emh-ds-card-content {
    position: relative;
    z-index: 1;
    max-width: 680px;
}

.emh-ds-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 28px;
    margin-bottom: var(--emh-ds-space-3);
    padding: 5px 10px;
    color: var(--emh-ds-primary);
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.24);
    border-radius: 999px;
    font-family: var(--font-code, "Geist Mono", ui-monospace, monospace);
    font-size: 12px;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.emh-ds-title {
    margin: 0 0 var(--emh-ds-space-2);
    color: var(--emh-ds-text);
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.015em;
}

.emh-ds-description {
    max-width: 68ch;
    margin: 0;
    color: var(--emh-ds-text-muted);
    font-size: 16px;
    line-height: 1.6;
}

.emh-ds-button {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--emh-ds-space-2);
    min-height: 46px;
    padding: 11px 20px;
    color: #ffffff;
    background: var(--emh-ds-primary-strong);
    border: 1px solid transparent;
    border-radius: var(--emh-ds-radius-md);
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.24);
    font-size: 14px;
    font-weight: 650;
    line-height: 1.35;
    text-decoration: none;
    transition:
        transform var(--emh-ds-duration-normal) var(--emh-ds-ease),
        background-color var(--emh-ds-duration-normal) var(--emh-ds-ease),
        border-color var(--emh-ds-duration-normal) var(--emh-ds-ease),
        box-shadow var(--emh-ds-duration-normal) var(--emh-ds-ease);
}

.emh-ds-button:hover {
    color: #ffffff;
    background: #0369a1;
    box-shadow: 0 7px 20px rgba(2, 132, 199, 0.3);
    transform: translateY(-1px);
}

.emh-ds-button:active {
    transform: translateY(0);
}

.emh-ds-button:focus-visible {
    outline: 2px solid var(--emh-ds-focus);
    outline-offset: 3px;
}

.emh-ds-button svg {
    flex: 0 0 auto;
    transition: transform var(--emh-ds-duration-normal) var(--emh-ds-ease);
}

.emh-ds-button:hover svg {
    transform: translateX(2px);
}

@media (max-width: 768px) {
    .emh-ds-title {
        font-size: 1.25rem;
    }

    .emh-ds-description {
        font-size: 15px;
    }

    .emh-ds-button {
        width: 100%;
    }
}

@media (hover: none), (pointer: coarse) {
    .emh-ds-button:hover {
        box-shadow: 0 4px 14px rgba(2, 132, 199, 0.24);
        transform: none;
    }

    .emh-ds-button:hover svg {
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .emh-ds-button,
    .emh-ds-button svg {
        transition: none;
    }

    .emh-ds-button:hover,
    .emh-ds-button:active,
    .emh-ds-button:hover svg {
        transform: none;
    }
}

/* --------------------------------------------------------------------------
   Homepage learning hubs — desktop bento hierarchy
   -------------------------------------------------------------------------- */

.emh-home.emh-ds-scope .hub-card {
    border-color: var(--emh-ds-border);
    transition:
        transform var(--emh-ds-duration-normal) var(--emh-ds-ease),
        border-color var(--emh-ds-duration-normal) var(--emh-ds-ease),
        box-shadow var(--emh-ds-duration-normal) var(--emh-ds-ease);
}

.emh-home.emh-ds-scope .hub-card:focus-visible {
    outline: 2px solid var(--emh-ds-focus);
    outline-offset: 4px;
}

.emh-home.emh-ds-scope .hub-desc {
    font-size: 15px;
    line-height: 1.6;
}

.emh-home.emh-ds-scope .hub-action {
    min-height: 44px;
}

@media (min-width: 1100px) {
    .emh-home.emh-ds-scope .pillars-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        grid-auto-flow: dense;
        align-items: stretch;
    }

    .emh-home.emh-ds-scope .hub-card {
        min-height: 272px;
    }

    .emh-home.emh-ds-scope .hub-card:nth-child(1),
    .emh-home.emh-ds-scope .hub-card:nth-child(5) {
        grid-column: span 2;
    }
}

@media (hover: none), (pointer: coarse) {
    .emh-home.emh-ds-scope .hub-card:hover,
    .emh-home.emh-ds-scope .hub-card:hover .hub-icon-box,
    .emh-home.emh-ds-scope .hub-card:hover .hub-action svg {
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .emh-home.emh-ds-scope .hub-card,
    .emh-home.emh-ds-scope .hub-icon-box,
    .emh-home.emh-ds-scope .hub-action svg {
        transition: none;
    }

    .emh-home.emh-ds-scope .hub-card:hover,
    .emh-home.emh-ds-scope .hub-card:hover .hub-icon-box,
    .emh-home.emh-ds-scope .hub-card:hover .hub-action svg {
        transform: none;
    }
}

/* --------------------------------------------------------------------------
   Course catalog — opt-in accessibility and consistency pass
   -------------------------------------------------------------------------- */

.emh-catalog.emh-ds-scope .search-input {
    min-height: 48px;
    font-size: 16px;
    line-height: 1.5;
}

.emh-catalog.emh-ds-scope .search-clear-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--emh-ds-radius-sm);
    transition:
        color var(--emh-ds-duration-fast) var(--emh-ds-ease),
        background-color var(--emh-ds-duration-fast) var(--emh-ds-ease);
}

.emh-catalog.emh-ds-scope .search-clear-btn:hover {
    color: var(--emh-ds-text);
    background: var(--emh-ds-surface-raised);
}

.emh-catalog.emh-ds-scope .search-clear-btn:focus-visible,
.emh-catalog.emh-ds-scope .filter-btn:focus-visible,
.emh-catalog.emh-ds-scope .btn-open-repo:focus-visible {
    outline: 2px solid var(--emh-ds-focus);
    outline-offset: 3px;
}

.emh-catalog.emh-ds-scope .filter-btn {
    min-height: 44px;
    padding: 9px 16px;
    font-size: 14px;
    line-height: 1.3;
    transition:
        color var(--emh-ds-duration-fast) var(--emh-ds-ease),
        background-color var(--emh-ds-duration-fast) var(--emh-ds-ease),
        border-color var(--emh-ds-duration-fast) var(--emh-ds-ease),
        box-shadow var(--emh-ds-duration-fast) var(--emh-ds-ease);
}

.emh-catalog.emh-ds-scope .repo-card {
    border-color: var(--emh-ds-border);
    transition:
        transform var(--emh-ds-duration-normal) var(--emh-ds-ease),
        border-color var(--emh-ds-duration-normal) var(--emh-ds-ease),
        box-shadow var(--emh-ds-duration-normal) var(--emh-ds-ease);
}

.emh-catalog.emh-ds-scope .repo-summary {
    font-size: 15px;
    line-height: 1.55;
}

.emh-catalog.emh-ds-scope .skill-chip,
.emh-catalog.emh-ds-scope .badge-level {
    font-size: 12px;
    line-height: 1.35;
}

.emh-catalog.emh-ds-scope .btn-open-repo {
    min-height: 44px;
    font-size: 14px;
    transition:
        color var(--emh-ds-duration-normal) var(--emh-ds-ease),
        background-color var(--emh-ds-duration-normal) var(--emh-ds-ease),
        border-color var(--emh-ds-duration-normal) var(--emh-ds-ease);
}

@media (hover: none), (pointer: coarse) {
    .emh-catalog.emh-ds-scope .repo-card:hover {
        transform: none;
    }
}

/* --------------------------------------------------------------------------
   Student dashboard — learning-first signed-in hierarchy
   -------------------------------------------------------------------------- */

.emh-student-dashboard.emh-ds-scope #studentEmailForm input,
.emh-student-dashboard.emh-ds-scope #studentEmailForm select,
.emh-student-dashboard.emh-ds-scope #studentEmailForm button[type="submit"] {
    min-height: 44px;
}

.emh-student-dashboard.emh-ds-scope #studentEmailForm input:focus-visible,
.emh-student-dashboard.emh-ds-scope #studentEmailForm select:focus-visible,
.emh-student-dashboard.emh-ds-scope #studentEmailForm button:focus-visible,
.emh-student-dashboard.emh-ds-scope #studentAuthView a:focus-visible,
.emh-student-dashboard.emh-ds-scope .emh-dashboard-welcome button:focus-visible,
.emh-student-dashboard.emh-ds-scope .emh-dashboard-resume a:focus-visible,
.emh-student-dashboard.emh-ds-scope .dashboard-tab-btn:focus-visible {
    outline: 2px solid var(--emh-ds-focus);
    outline-offset: 3px;
}

.emh-student-dashboard.emh-ds-scope .emh-student-dashboard-view:not(.hidden) {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    width: 100%;
    max-width: 100%;
    gap: var(--emh-ds-space-8);
}

.emh-student-dashboard.emh-ds-scope .emh-student-dashboard-view:not(.hidden) > * {
    margin-top: 0 !important;
    min-width: 0;
    max-width: 100%;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-resume {
    order: 1;
    padding: clamp(1.25rem, 3vw, 2rem);
    border-color: rgba(56, 189, 248, 0.34);
    box-shadow: 0 18px 48px rgba(2, 132, 199, 0.12);
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-resume h3 {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    line-height: 1.3;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-resume p {
    font-size: 14px;
    line-height: 1.55;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-resume #btnResumePractice {
    min-height: 46px;
    padding-inline: 1.25rem;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-welcome {
    order: 2;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-kpis {
    order: 3;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-tabs {
    order: 4;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-pane {
    order: 5;
}

.emh-student-dashboard.emh-ds-scope .emh-dashboard-kpis > .glass-card {
    min-height: 148px;
    border-color: var(--emh-ds-border);
}

.emh-student-dashboard.emh-ds-scope .dashboard-tab-btn {
    min-height: 44px;
}

@media (max-width: 640px) {
    .emh-student-dashboard.emh-ds-scope .emh-student-dashboard-view:not(.hidden) {
        gap: var(--emh-ds-space-6);
    }

    .emh-student-dashboard.emh-ds-scope .emh-dashboard-resume #btnResumePractice {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .emh-student-dashboard.emh-ds-scope .emh-dashboard-resume,
    .emh-student-dashboard.emh-ds-scope .emh-dashboard-resume #btnResumePractice,
    .emh-student-dashboard.emh-ds-scope .dashboard-tab-btn {
        transition: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .emh-catalog.emh-ds-scope .search-clear-btn,
    .emh-catalog.emh-ds-scope .filter-btn,
    .emh-catalog.emh-ds-scope .repo-card,
    .emh-catalog.emh-ds-scope .btn-open-repo {
        transition: none;
    }

    .emh-catalog.emh-ds-scope .repo-card:hover {
        transform: none;
    }
}

/* --------------------------------------------------------------------------
   Teacher dashboard — guarded accessibility and surface consistency
   -------------------------------------------------------------------------- */

.emh-teacher-dashboard.emh-ds-scope #teacherAuthView .glass-panel {
    border-color: var(--emh-ds-border);
    box-shadow: var(--emh-ds-shadow-lg);
}

.emh-teacher-dashboard.emh-ds-scope #teacherLoginForm input,
.emh-teacher-dashboard.emh-ds-scope #teacherLoginForm button[type="submit"] {
    min-height: 46px;
}

.emh-teacher-dashboard.emh-ds-scope #toggleTeacherPasswordBtn {
    width: 40px;
    height: 40px;
    padding: 0;
}

.emh-teacher-dashboard.emh-ds-scope #teacherAuthView a {
    min-height: 44px;
}

.emh-teacher-dashboard.emh-ds-scope button:focus-visible,
.emh-teacher-dashboard.emh-ds-scope a:focus-visible,
.emh-teacher-dashboard.emh-ds-scope input:focus-visible,
.emh-teacher-dashboard.emh-ds-scope select:focus-visible,
.emh-teacher-dashboard.emh-ds-scope textarea:focus-visible,
.emh-teacher-dashboard.emh-ds-scope [tabindex]:focus-visible {
    outline: 2px solid var(--emh-ds-focus);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    .emh-teacher-dashboard.emh-ds-scope *,
    .emh-teacher-dashboard.emh-ds-scope *::before,
    .emh-teacher-dashboard.emh-ds-scope *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* --------------------------------------------------------------------------
   Learning hubs — shared catalog accessibility (opt-in landing pages only)
   -------------------------------------------------------------------------- */

.emh-learning-hub.emh-ds-scope .hub-sidebar-item,
.emh-learning-hub.emh-ds-scope .filter-btn,
.emh-learning-hub.emh-ds-scope .passage-filter-btn,
.emh-learning-hub.emh-ds-scope .type-filter-btn,
.emh-learning-hub.emh-ds-scope .quarter-filter-btn,
.emh-learning-hub.emh-ds-scope .tab-btn,
.emh-learning-hub.emh-ds-scope .pill-btn {
    min-height: 44px;
}

.emh-learning-hub.emh-ds-scope .filter-btn,
.emh-learning-hub.emh-ds-scope .passage-filter-btn,
.emh-learning-hub.emh-ds-scope .type-filter-btn {
    flex-shrink: 0 !important;
    white-space: nowrap !important;
    width: auto !important;
}

.emh-learning-hub.emh-ds-scope #navBurgerBtn,
.emh-learning-hub.emh-ds-scope #themeToggleBtn,
.emh-learning-hub.emh-ds-scope #theme-toggle,
.emh-learning-hub.emh-ds-scope #hubSidebarCloseBtn {
    min-width: 40px;
    min-height: 40px;
}

.emh-learning-hub.emh-ds-scope a:focus-visible,
.emh-learning-hub.emh-ds-scope button:focus-visible,
.emh-learning-hub.emh-ds-scope input:focus-visible,
.emh-learning-hub.emh-ds-scope select:focus-visible,
.emh-learning-hub.emh-ds-scope textarea:focus-visible,
.emh-learning-hub.emh-ds-scope [tabindex]:focus-visible {
    outline: 2px solid var(--emh-ds-focus);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    .emh-learning-hub.emh-ds-scope *,
    .emh-learning-hub.emh-ds-scope *::before,
    .emh-learning-hub.emh-ds-scope *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}