/* ============================================================
   Kvízuj.sk - Moderný vzdelávací dizajn
   ============================================================ */

:root {
    --primary: #4361ee;
    --primary-hover: #3a56d4;
    --primary-light: #eef2ff;
    --secondary: #7209b7;
    --accent: #f72585;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.12), 0 10px 10px -5px rgba(0,0,0,0.04);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--primary-hover);
}

/* Navigácia */
.navbar {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.brand-icon {
    font-size: 1.75rem;
    background: linear-gradient(135deg, #4361ee, #7209b7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-tag {
    font-size: 0.65rem;
    background: #e0e7ff;
    color: var(--primary);
    padding: 2px 6px;
    border-radius: 6px;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.nav-btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.nav-btn-outline:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
}

.nav-btn-primary {
    background: var(--primary);
    color: #ffffff;
}

.nav-btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(67, 97, 238, 0.3);
}

.nav-btn-accent {
    background: #10b981;
    color: #fff;
}
.nav-btn-accent:hover {
    background: #059669;
}

/* Hlavný kontajner */
.main-content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Hero / Informačný banner */
.hero-card {
    background: linear-gradient(135deg, #3a0ca3, #4361ee 70%, #4cc9f0);
    color: #ffffff;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.hero-text h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.hero-text p {
    font-size: 1.05rem;
    opacity: 0.9;
    max-width: 620px;
}

.network-badge {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.network-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.85;
}

.network-ip {
    font-family: monospace;
    font-size: 1.15rem;
    font-weight: 700;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    display: inline-block;
}

.network-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.3rem;
}

/* Sekcia aktivít */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.activities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

/* Karta aktivity */
.activity-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.activity-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: #cbd5e1;
}

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

.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 20px;
}

.badge-pairs {
    background: #e0f2fe;
    color: #0369a1;
}

.badge-quiz {
    background: #fef3c7;
    color: #b45309;
}

.badge-groups {
    background: #f3e8ff;
    color: #6b21a8;
}

.badge-cloze {
    background: #dcfce7;
    color: #15803d;
}

.badge-unjumble {
    background: #ffedd5;
    color: #c2410c;
}

.badge-timeline {
    background: #e0e7ff;
    color: #4338ca;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.92rem;
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

/* Tlačidlá herných módov na karte */
.game-launchers {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.game-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0.2rem;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: center;
}

.game-btn span.icon {
    font-size: 1.3rem;
    margin-bottom: 2px;
}

.game-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: #cbd5e1;
    transform: scale(1.04);
}

.card-bottom-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
}

.action-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.action-link:hover {
    color: var(--primary);
}

.action-link-danger:hover {
    color: var(--danger);
}

/* Modálne okno */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    background: #ffffff;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 480px;
    padding: 2rem;
    box-shadow: var(--shadow-xl);
    text-align: center;
    position: relative;
    transform: scale(0.95);
    transition: transform 0.2s ease;
}

.modal-overlay.active .modal-card {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

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

.qr-box {
    margin: 1.5rem auto;
    display: flex;
    justify-content: center;
    background: #fff;
    padding: 1rem;
    border: 2px dashed #cbd5e1;
    border-radius: var(--radius-md);
    width: 250px;
    height: 250px;
}

/* Formuláre a editor */
.form-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: #f8fafc;
    transition: border-color 0.15s, background-color 0.15s;
    font-family: inherit;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

.item-row {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 0.75rem;
    display: grid;
    grid-template-columns: 30px 1fr 1fr 40px;
    gap: 0.75rem;
    align-items: center;
}

.item-row-quiz {
    grid-template-columns: 30px 2fr 1.5fr 1.5fr 40px;
}

.row-num {
    font-weight: 700;
    color: var(--text-muted);
    text-align: center;
}

.btn-remove-row {
    background: #fee2e2;
    color: var(--danger);
    border: none;
    border-radius: 6px;
    width: 36px;
    height: 36px;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.btn-remove-row:hover {
    background: #fecaca;
}

/* Rebríček */
.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.leaderboard-table th, .leaderboard-table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.leaderboard-table th {
    background: #f8fafc;
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.leaderboard-table tr:hover {
    background: #f8fafc;
}

.rank-1 { color: #d97706; font-weight: 800; }
.rank-2 { color: #64748b; font-weight: 800; }
.rank-3 { color: #b45309; font-weight: 800; }

/* Pätička */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-top: auto;
}

/* ============================================================
   Zoskupovanie podľa predmetov a filtrovanie
   ============================================================ */
.subject-filter-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    background: #ffffff;
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.subject-pills {
    display: flex;
    gap: 0.45rem;
    flex-wrap: wrap;
    align-items: center;
}

.subject-filter-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--bg-page);
    color: var(--text-main);
    transition: all 0.15s ease;
    user-select: none;
}

.subject-filter-pill:hover {
    background: #e2e8f0;
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

.subject-filter-pill.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 2px 6px rgba(67, 97, 238, 0.3);
}

.subject-filter-pill .pill-count {
    font-size: 0.72rem;
    padding: 0.1rem 0.45rem;
    border-radius: 9999px;
    background: rgba(0, 0, 0, 0.08);
    font-weight: 700;
}

.subject-filter-pill.active .pill-count {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

.view-toggle-wrap {
    display: inline-flex;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 3px;
}

.view-toggle-btn {
    border: none;
    background: transparent;
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.view-toggle-btn.active {
    background: #ffffff;
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    font-weight: 700;
}

/* Skupina predmetu */
.subject-group {
    margin-bottom: 3rem;
    transition: opacity 0.2s ease;
}

.subject-group.hidden {
    display: none !important;
}

.subject-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.subject-title-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.subject-icon-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.6rem;
    height: 2.6rem;
    border-radius: var(--radius-sm);
    font-size: 1.4rem;
    flex-shrink: 0;
}

.subject-title {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.subject-count-badge {
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.2rem 0.65rem;
    border-radius: 9999px;
    background: #f1f5f9;
    color: var(--text-muted);
}

.subject-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.18rem 0.55rem;
    border-radius: 9999px;
    text-transform: none;
    letter-spacing: normal;
}

/* ============================================================
   Hamburger menu, výsuvný drawer a čistá navigácia
   ============================================================ */
.badge-teacher {
    background: #dbeafe;
    color: #1d4ed8;
    border: 1px solid #bfdbfe;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 0.25rem 0.65rem;
    border-radius: 9999px;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.nav-btn-pin {
    background: #f1f5f9;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    font-weight: 700;
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.nav-btn-pin:hover {
    background: #e2e8f0;
    border-color: #cbd5e1;
}

.hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 38px;
    height: 38px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0;
    transition: all 0.15s ease;
}

.hamburger-btn:hover {
    background: #f1f5f9;
    border-color: #cbd5e1;
}

.hamburger-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: all 0.2s ease;
}

.drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.drawer-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.nav-drawer {
    position: fixed;
    top: 0;
    right: 0;
    width: 320px;
    max-width: 85vw;
    height: 100vh;
    background: #ffffff;
    z-index: 999;
    box-shadow: -4px 0 25px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.nav-drawer.active {
    transform: translateX(0);
}

.drawer-header {
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.drawer-close {
    background: transparent;
    border: none;
    font-size: 1.6rem;
    line-height: 1;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.2rem;
    border-radius: 4px;
}

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

.drawer-user-card {
    margin: 1rem 1.25rem;
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    background: #f8fafc;
    border: 1px solid var(--border-color);
}

.drawer-section-title {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.6px;
    margin: 1.2rem 1.25rem 0.4rem;
}

.drawer-links {
    display: flex;
    flex-direction: column;
    padding: 0 0.75rem 1.5rem;
    gap: 0.2rem;
}

.drawer-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.15s ease;
}

.drawer-link:hover {
    background: #f1f5f9;
    color: var(--primary);
}

.drawer-link.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
}

.drawer-link .d-icon {
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
}

/* ============================================================
   Žiaci: Nicknamy, Avatari a farebné podfarbenie
   ============================================================ */
.gender-girl {
    color: #e11d48;
    background: #ffe4e6;
    border: 1px solid #fecdd3;
}

.gender-boy {
    color: #2563eb;
    background: #dbeafe;
    border: 1px solid #bfdbfe;
}

.row-girl {
    background: #fff8f8 !important;
}

.row-boy {
    background: #f8faff !important;
}

.avatar-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    font-size: 1.25rem;
    background: #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    flex-shrink: 0;
}

.avatar-choice-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.5rem;
    margin: 0.75rem 0;
}

.avatar-choice-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: #ffffff;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all 0.15s ease;
}

.avatar-choice-btn:hover {
    border-color: #cbd5e1;
    background: #f8fafc;
    transform: translateY(-2px);
}

.avatar-choice-btn.selected {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 2px 6px rgba(67, 97, 238, 0.25);
}

.badge-public {
    background: #ecfdf5;
    color: #059669;
    border: 1px solid #a7f3d0;
    border-radius: 9999px;
    padding: 0.18rem 0.55rem;
    font-size: 0.73rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.badge-public:hover {
    background: #d1fae5;
    border-color: #6ee7b7;
}

.badge-private {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
    border-radius: 9999px;
    padding: 0.18rem 0.55rem;
    font-size: 0.73rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.badge-private:hover {
    background: #fee2e2;
    border-color: #fca5a5;
}

.btn-launch-session {
    background: linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
    color: white !important;
    border: none;
    border-radius: 6px;
    padding: 0.4rem 0.75rem;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    text-decoration: none;
    transition: transform 0.15s, box-shadow 0.15s;
    box-shadow: 0 2px 5px rgba(67, 97, 238, 0.25);
}
.btn-launch-session:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(67, 97, 238, 0.35);
}

.home-quick-banner {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
}

.home-quick-pin-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}


/* Responzivita */
@media (max-width: 768px) {
    .hero-card {
        flex-direction: column;
        align-items: stretch;
    }
    .item-row {
        grid-template-columns: 1fr;
    }
    .nav-container {
        padding: 0.6rem 1rem;
    }
    .subject-filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .subject-pills {
        overflow-x: auto;
        padding-bottom: 0.25rem;
        flex-wrap: nowrap;
    }
    .subject-filter-pill {
        white-space: nowrap;
        flex-shrink: 0;
    }
    .view-toggle-wrap {
        align-self: flex-start;
    }
    .avatar-choice-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================================
   Živé premietanie a pripojení žiaci (Lobby na tabuli)
   ============================================================ */
.live-pulse-dot {
    width: 10px;
    height: 10px;
    background-color: #10b981;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: livePulse 1.8s infinite;
}

@keyframes livePulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    70% {
        transform: scale(1.15);
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
    }
}

.projector-student-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.6rem;
    max-height: 220px;
    overflow-y: auto;
    padding: 0.5rem 0.25rem;
}

.projector-student-chip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.65rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    animation: popIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.projector-student-chip.chip-boy {
    background: #eff6ff;
    border: 1.5px solid #bfdbfe;
    color: #1e40af;
}

.projector-student-chip.chip-girl {
    background: #fff1f2;
    border: 1.5px solid #fecdd3;
    color: #9f1239;
}

@keyframes popIn {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* Časový limit odpočítavania */
.countdown-box {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 800;
    font-size: 0.95rem;
}

.countdown-box.urgent {
    background: #fef2f2 !important;
    border: 2px solid #ef4444 !important;
    color: #dc2626 !important;
    animation: countdownPulse 1s infinite alternate;
}

@keyframes countdownPulse {
    0% { transform: scale(1); background: #fef2f2; }
    100% { transform: scale(1.05); background: #fee2e2; }
}

/* ============================================================
   Diplomy a certifikáty pre víťazov (Tlač A4 na šírku)
   ============================================================ */
.diploma-card {
    background: #ffffff;
    border: 8px double #d4af37;
    border-radius: 12px;
    padding: 2.5rem 3rem;
    text-align: center;
    color: #1e293b;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    margin: 0 auto;
    max-width: 820px;
    background-image: radial-gradient(#faf7ee 10%, transparent 10%);
    background-size: 20px 20px;
}

.diploma-ribbon {
    font-size: 3.5rem;
    margin-bottom: 0.25rem;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.15));
}

.diploma-title {
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 4px;
    color: #b45309;
    text-transform: uppercase;
    margin: 0 0 0.5rem 0;
}

.diploma-subtitle {
    font-size: 1.15rem;
    color: #64748b;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.diploma-awardee {
    font-size: 2rem;
    font-weight: 800;
    color: #0f172a;
    border-bottom: 2px solid #e2e8f0;
    display: inline-block;
    padding: 0 2rem 0.4rem 2rem;
    margin-bottom: 1rem;
}

.diploma-detail {
    font-size: 1.1rem;
    color: #334155;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.diploma-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: 2.5rem;
    padding-top: 1rem;
    border-top: 1px dashed #cbd5e1;
}

.diploma-sign {
    border-top: 1px solid #475569;
    width: 180px;
    padding-top: 0.35rem;
    font-size: 0.85rem;
    color: #64748b;
}

@media print {
    body * {
        visibility: hidden;
    }
    .diploma-printable-area, .diploma-printable-area * {
        visibility: visible;
    }
    .diploma-printable-area {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        margin: 0;
        padding: 0;
    }
    .diploma-card {
        border: 10px double #b45309 !important;
        box-shadow: none !important;
        page-break-inside: avoid;
        width: 100% !important;
        max-width: 100% !important;
        height: 96vh !important;
        box-sizing: border-box;
        padding: 2.5cm 2cm !important;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }
    .no-print {
        display: none !important;
    }
    @page {
        size: A4 landscape;
        margin: 0.8cm;
    }
}

/* ============================================================
   Matematický generátor príkladov (Kompaktné mobilné/tabletové 3-krokové UI)
   ============================================================ */
.math-gen-card {
    max-width: 540px;
    width: 96%;
    max-height: 96dvh;
    overflow-y: auto;
    text-align: left;
    padding: 0.9rem 1.05rem;
    border-radius: 16px;
}

.mg-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.55rem;
    margin-bottom: 0.6rem;
    border-bottom: 1px solid #e2e8f0;
}

.mg-topbar-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.mg-topbar-icon {
    font-size: 1.45rem;
    width: 36px;
    height: 36px;
    border-radius: 9px;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.mg-topbar-title h2 {
    font-size: 1.05rem;
    font-weight: 800;
    margin: 0;
    color: #0f172a;
    line-height: 1.15;
}

.mg-subtitle-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    color: #2563eb;
    margin-top: 1px;
}

.mg-close-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    background: #f8fafc;
    color: #475569;
    font-size: 1.35rem;
    line-height: 1;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.mg-close-btn:hover {
    background: #fee2e2;
    color: #dc2626;
    border-color: #fecaca;
}

.mg-body {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.mg-section {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 0.55rem 0.65rem;
}

.mg-sec-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 800;
    color: #334155;
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.mg-step-num {
    width: 19px;
    height: 19px;
    border-radius: 50%;
    background: var(--primary);
    color: #ffffff;
    font-size: 0.7rem;
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Krok 1: Operácie (4 základné + 3 kombinované) */
.mg-ops-row4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.35rem;
    margin-bottom: 0.35rem;
}

.mg-ops-row3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.35rem;
}

.mg-op-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.38rem 0.25rem;
    border-radius: 9px;
    border: 1.5px solid #cbd5e1;
    background: #ffffff;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.12s ease;
    min-height: 46px;
}

.mg-op-btn:hover {
    border-color: #93c5fd;
    background: #f0f9ff;
}

.mg-op-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(67, 97, 238, 0.28);
}

.mg-op-sym {
    font-size: 1.05rem;
    font-weight: 900;
    line-height: 1.1;
    color: #0f172a;
}

.mg-op-btn.active .mg-op-sym,
.mg-op-btn.active .mg-op-lbl {
    color: #ffffff;
}

.mg-op-lbl {
    font-size: 0.68rem;
    font-weight: 700;
    color: #475569;
    margin-top: 2px;
    text-align: center;
    line-height: 1.1;
}

/* Krok 2: Segmentový prepínač číselného oboru + pilulky rozsahu */
.mg-segment-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background: #e2e8f0;
    padding: 3px;
    border-radius: 9px;
    gap: 3px;
    margin-bottom: 0.45rem;
}

.mg-seg-btn {
    border: none;
    background: transparent;
    border-radius: 7px;
    padding: 0.32rem 0.25rem;
    font-family: inherit;
    font-size: 0.74rem;
    font-weight: 700;
    color: #475569;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.15;
    transition: all 0.12s ease;
}

.mg-seg-sym {
    font-size: 0.68rem;
    font-weight: 800;
    opacity: 0.75;
}

.mg-seg-btn.active {
    background: #ffffff;
    color: #0f172a;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.mg-seg-btn.active .mg-seg-sym {
    color: var(--primary);
    opacity: 1;
}

.mg-pills-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.mg-pill {
    flex: 1 1 auto;
    padding: 0.32rem 0.55rem;
    border-radius: 7px;
    border: 1.5px solid #cbd5e1;
    background: #ffffff;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 700;
    color: #334155;
    cursor: pointer;
    text-align: center;
    transition: all 0.12s ease;
}

.mg-pill.active {
    background: #0f172a;
    border-color: #0f172a;
    color: #ffffff;
}

.mg-custom-inline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.4rem;
    padding-top: 0.35rem;
    border-top: 1px dashed #cbd5e1;
    font-size: 0.78rem;
    font-weight: 700;
    color: #334155;
}

.mg-custom-inline input {
    width: 72px;
    padding: 0.22rem 0.4rem;
    border: 1.5px solid #cbd5e1;
    border-radius: 6px;
    font-weight: 800;
    font-size: 0.8rem;
    text-align: center;
}

.mg-num-row {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-top: 0.4rem;
    padding-top: 0.35rem;
    border-top: 1px dashed #cbd5e1;
    flex-wrap: wrap;
}

.mg-num-label {
    font-size: 0.72rem;
    font-weight: 800;
    color: #475569;
}

.mg-num-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.mg-num-chip {
    min-width: 28px;
    height: 26px;
    padding: 0 0.4rem;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    font-size: 0.74rem;
    font-weight: 800;
    color: #334155;
    cursor: pointer;
    font-family: inherit;
}

.mg-num-chip.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

/* Krok 3: Kompaktná mriežka 4×2 pre aktivity */
.mg-modes-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.35rem;
}

.mg-mode-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.42rem 0.2rem 0.35rem;
    border-radius: 9px;
    border: 1.5px solid #cbd5e1;
    background: #ffffff;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.12s ease;
    min-height: 50px;
}

.mg-mode-tile:hover {
    border-color: #93c5fd;
    background: #f8fafc;
}

.mg-mode-tile.active {
    background: #eff6ff;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.22);
}

.mg-mode-ico {
    font-size: 1.15rem;
    line-height: 1;
}

.mg-mode-txt {
    font-size: 0.71rem;
    font-weight: 800;
    color: #1e293b;
    margin-top: 3px;
    line-height: 1.1;
}

.mg-mode-tile.active .mg-mode-txt {
    color: var(--primary);
}

.mg-mode-star {
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 0.58rem;
    font-weight: 800;
    color: #94a3b8;
}

.mg-mode-star.recommended {
    color: #d97706;
}

/* Podvoľba počtu úloh / veľkosti mriežky */
.mg-sub-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
    margin-top: 0.45rem;
    padding-top: 0.4rem;
    border-top: 1px solid #e2e8f0;
    flex-wrap: wrap;
}

.mg-sub-bar-lbl {
    font-size: 0.74rem;
    font-weight: 800;
    color: #475569;
}

.mg-sub-pills {
    display: flex;
    gap: 0.28rem;
    flex-wrap: wrap;
}

.mg-sub-pill {
    padding: 0.22rem 0.55rem;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    font-size: 0.74rem;
    font-weight: 800;
    color: #334155;
    cursor: pointer;
    font-family: inherit;
}

.mg-sub-pill.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

/* Kompaktný riadok so živou ukážkou */
.mg-preview-strip {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: #f1f5f9;
    border-radius: 9px;
    padding: 0.35rem 0.55rem;
}

.mg-preview-lbl {
    font-size: 0.7rem;
    font-weight: 800;
    color: #64748b;
    text-transform: uppercase;
    flex-shrink: 0;
}

.mg-preview-items {
    display: flex;
    gap: 0.3rem;
    flex-wrap: wrap;
    flex: 1;
    overflow: hidden;
}

.mg-prev-chip {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 5px;
    padding: 0.12rem 0.4rem;
    font-size: 0.74rem;
    font-weight: 700;
    color: #1e293b;
    white-space: nowrap;
}

.mg-refresh-btn {
    border: none;
    background: #ffffff;
    border-radius: 6px;
    width: 26px;
    height: 26px;
    cursor: pointer;
    font-size: 0.8rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #cbd5e1;
    flex-shrink: 0;
}

/* Rozbaľovací učiteľský panel */
.mg-teacher-wrap {
    border: 1px solid #bfdbfe;
    background: #eff6ff;
    border-radius: 9px;
    overflow: hidden;
}

.mg-teacher-toggle {
    width: 100%;
    border: none;
    background: transparent;
    padding: 0.4rem 0.65rem;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 800;
    color: #1e40af;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.mg-teacher-drawer {
    padding: 0.4rem 0.65rem 0.55rem;
    border-top: 1px solid #bfdbfe;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.mg-chk-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.78rem;
    font-weight: 600;
    color: #1e3a8a;
    cursor: pointer;
}

.mg-teacher-sub {
    display: flex;
    gap: 0.4rem;
    padding-left: 1.2rem;
    flex-wrap: wrap;
}

/* Pätička s hlavným tlačidlom */
.mg-footer {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.1rem;
}

.mg-btn-launch {
    flex: 1;
    justify-content: center;
    padding: 0.6rem 1rem !important;
    font-size: 0.92rem !important;
    font-weight: 800 !important;
    border-radius: 10px !important;
}

.mg-btn-editor {
    padding: 0.6rem 0.85rem !important;
    font-size: 0.82rem !important;
    border-radius: 10px !important;
}

@media (max-width: 480px) {
    .math-gen-card {
        padding: 0.65rem 0.75rem;
        width: 98%;
        max-height: 98dvh;
    }
    .mg-op-lbl {
        font-size: 0.63rem;
    }
    .mg-mode-txt {
        font-size: 0.66rem;
    }
}

.math-banner-card {
    background: linear-gradient(135deg, #eff6ff 0%, #e0e7ff 100%);
    border: 1.5px solid #bfdbfe;
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    flex-wrap: wrap;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}