:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --card-bg: #ffffff;
    --header-bg: #ffffff;
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --modal-bg: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    
    /* Green brand theme */
    --brand-color: #52873e;
    --brand-hover: #436f32;
    --brand-glow: rgba(82, 135, 62, 0.15);
    /* Banners */
    --intro-bg: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    --intro-border: #bbf7d0;
    --intro-text: #14532d;
    --ai-bg: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    --ai-border: #bfdbfe;
    --ai-text-h: #1e3a8a;
    --ai-text-p: #1e40af;

    /* Test Results */
    --correct-bg: #f0fdf4;
    --correct-border: #bbf7d0;
    --correct-text: #16a34a;
    --incorrect-bg: #fff5f5;
    --incorrect-border: #fca5a5;
    --incorrect-text: #dc2626;
    --result-banner-bg: #f1f5f9;
    --result-banner-border: #cbd5e1;
    --result-banner-text: #475569;
}

.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --card-bg: #1e293b;
    --header-bg: #1e293b;
    --input-bg: #0f172a;
    --input-border: #475569;
    --modal-bg: #1e293b;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    
    --brand-color: #62a84d;
    --brand-hover: #52873e;
    --brand-glow: rgba(98, 168, 77, 0.25);

    /* Banners */
    --intro-bg: linear-gradient(135deg, #064e3b 0%, #022c22 100%);
    --intro-border: #047857;
    --intro-text: #a7f3d0;
    --ai-bg: linear-gradient(135deg, #1e3a8a 0%, #172554 100%);
    --ai-border: #1d4ed8;
    --ai-text-h: #dbeafe;
    --ai-text-p: #93c5fd;

    /* Test Results */
    --correct-bg: rgba(22, 163, 74, 0.15);
    --correct-border: rgba(22, 163, 74, 0.4);
    --correct-text: #4ade80;
    --incorrect-bg: rgba(220, 38, 38, 0.15);
    --incorrect-border: rgba(220, 38, 38, 0.4);
    --incorrect-text: #f87171;
    --result-banner-bg: #1e293b;
    --result-banner-border: #334155;
    --result-banner-text: #94a3b8;
}

/* Custom Premium Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-primary);
}

body {
    margin: 0;
    font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    -webkit-tap-highlight-color: transparent;
    transition: background-color 0.3s ease, color 0.3s ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
    transition: background-color 0.2s, color 0.2s;
}

.theme-toggle-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

/* Base button animations and design */
.big-btn {
    background: linear-gradient(135deg, var(--brand-color) 0%, var(--brand-hover) 100%);
    color: white;
    padding: 0.9rem 1.8rem;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 10px var(--brand-glow);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.big-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(82, 135, 62, 0.3);
}

.big-btn:active {
    transform: translateY(0) scale(0.98);
}

/* Floating Action Button (FAB) */
.fab {
    position: fixed;
    bottom: 90px;
    right: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-color) 0%, var(--brand-hover) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 4px 16px var(--brand-glow);
    border: none;
    cursor: pointer;
    z-index: 99;
    transition: transform 0.2s, box-shadow 0.2s;
}

.fab:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 6px 20px var(--brand-glow);
}

.fab:active {
    transform: scale(0.95);
}

/* Bottom Navigation for Mobile */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70px;
    background-color: var(--bg-secondary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    display: none;
    justify-content: space-around;
    align-items: center;
    z-index: 999;
    padding-bottom: env(safe-area-inset-bottom);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.03);
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    gap: 4px;
    flex: 1;
    height: 100%;
    transition: color 0.2s;
}

.bottom-nav-item.active {
    color: var(--brand-color);
}

.bottom-nav-item svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    stroke-width: 2.2;
    transition: transform 0.2s;
}

.bottom-nav-item:active svg {
    transform: scale(0.9);
}

/* Mobile-First Layout tweaks */
@media (max-width: 768px) {
    .bottom-nav {
        display: flex;
    }
    
    header {
        padding: 0.8rem 1.2rem !important;
    }
    
    header .header-actions {
        display: none !important; /* Move to bottom nav */
    }

    footer {
        display: none !important;
    }

    .container {
        padding-bottom: 100px !important;
    }

    /* Modals behave as Bottom Sheets */
    body .modal {
        align-items: flex-end !important;
    }

    .modal-content {
        width: 100% !important;
        max-width: 100% !important;
        border-radius: 24px 24px 0 0 !important;
        margin: 0 !important;
        max-height: 92vh !important;
        padding: 24px 16px 40px 16px !important;
        transform: translateY(0);
        transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
    }

    body .modal.hidden .modal-content {
        transform: translateY(100%);
    }

    /* Stack card rows cleanly using CSS grid on mobile */
    .card-row {
        display: grid !important;
        grid-template-columns: 1fr 1fr;
        grid-template-areas: 
            "star remove"
            "term term"
            "def def";
        gap: 12px !important;
        padding: 16px;
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        margin-bottom: 16px !important;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.01);
    }

    .card-row .star-row-btn {
        grid-area: star;
        justify-self: start;
        align-self: center;
        margin: 0;
        padding: 6px;
        background: none;
        border: none;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .card-row input.term-input {
        grid-area: term;
        width: 100% !important;
        box-sizing: border-box;
    }

    .card-row input.def-input {
        grid-area: def;
        width: 100% !important;
        box-sizing: border-box;
    }

    .card-row .remove-row-btn {
        grid-area: remove;
        justify-self: end;
        align-self: center;
        position: static !important;
        background: #fee2e2;
        color: #ef4444;
        width: 28px;
        height: 28px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        border: none;
    }
} /* end @media (max-width: 768px) */

/* Reset hover states on mobile to prevent sticky touch behavior */
@media (max-width: 768px) and (hover: none) {
    .btn:hover {
        background-color: #52873e;
        box-shadow: none;
        transform: none;
    }
    .btn-secondary:hover {
        background-color: #64748b;
        box-shadow: none;
        transform: none;
    }
    .btn-danger:hover {
        background-color: #ef4444;
        box-shadow: none;
        transform: none;
    }
    .big-btn:hover {
        background: linear-gradient(135deg, #52873e 0%, #436f32 100%);
        box-shadow: 0 4px 10px rgba(82, 135, 62, 0.2);
        transform: none;
    }
    .set-card:hover {
        transform: none;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        border-color: #e2e8f0;
    }
    .study-card:hover {
        transform: none;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
        border-color: #e2e8f0;
    }
    .edit-icon-btn:hover {
        background-color: #ffffff;
        color: #64748b;
        border-color: #cbd5e1;
    }
    .term-row:hover {
        border-color: #e2e8f0;
    }
    .icon-btn:hover {
        background-color: transparent;
        color: #94a3b8;
    }
    .tab-btn:hover {
        color: #64748b;
    }
    .tab-btn.active:hover {
        color: #52873e;
    }
    .choice-btn:hover {
        border-color: #cbd5e1;
        background-color: #ffffff;
    }
    .choice-btn.correct:hover {
        background-color: #dcfce7;
        border-color: #22c55e;
    }
    .choice-btn.incorrect:hover {
        background-color: #fee2e2;
        border-color: #ef4444;
    }
    .test-radio-label:hover {
        background-color: transparent;
    }
    .fab:hover {
        transform: none;
        box-shadow: 0 4px 16px rgba(82, 135, 62, 0.4);
    }
    .match-card:hover {
        border-color: var(--border-color);
        transform: none;
        box-shadow: var(--shadow-sm);
    }
}

@media (min-width: 769px) {
    .fab, .bottom-nav {
        display: none !important;
    }
}

/* Global Smooth Modals Transitions */
.modal {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

body .modal.hidden {
    display: flex !important; /* Keep flex context alive for transition */
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none;
}

.modal-content {
    transform: scale(1) translateY(0);
    opacity: 1;
    transition: transform 0.28s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.28s ease;
}

body .modal.hidden .modal-content {
    transform: scale(0.95) translateY(15px);
    opacity: 0;
}

/* MATCHING GAME SPECIFIC */
.match-grid {
    display: grid;
    grid-template-columns: repeat(var(--cols, 4), 1fr);
    gap: 16px;
    margin-top: 20px;
    width: 100%;
}

.match-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 24px 16px;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    user-select: none;
    box-shadow: var(--shadow-sm);
    word-break: break-word;
}

.match-card:hover {
    border-color: var(--brand-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.match-card.selected {
    border-color: var(--brand-color);
    background-color: var(--brand-glow);
    color: var(--brand-color);
}

.match-card.matched {
    border-color: #22c55e !important;
    background-color: #dcfce7 !important;
    color: #14532d !important;
    opacity: 0;
    transform: scale(0.9);
    pointer-events: none;
    transition: all 0.4s ease-out;
}

.match-card.incorrect {
    border-color: #ef4444 !important;
    background-color: #fee2e2 !important;
    color: #7f1d1d !important;
    animation: shake 0.3s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

@media (max-width: 768px) {
    .match-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }
    .match-card {
        padding: 10px 6px;
        font-size: 0.85rem;
        min-height: 60px;
        border-radius: 8px;
    }
}

@media (max-width: 480px) {
    .match-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }
    .match-card {
        padding: 8px 4px;
        font-size: 0.8rem;
        min-height: 50px;
    }
}

/* Custom Toggle Switch styling */
.toggle-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 14px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    transition: background-color 0.2s, border-color 0.2s;
}

.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--input-border);
    transition: 0.3s;
    border-radius: 34px;
}

.switch .slider::before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.switch input:checked + .slider {
    background-color: var(--brand-color);
}

.switch input:checked + .slider::before {
    transform: translateX(22px);
}

/* ── Gedeelde pagina-layout ─────────────────────────────────────────────── */

/* App Header (sticky) */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.2s, border-color 0.2s;
}

#logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
    text-decoration: none;
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 30px 20px;
    text-align: center;
    margin-top: auto;
    flex-shrink: 0;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--brand-color);
}

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

/* ── Knoppen ────────────────────────────────────────────────────────────── */

.btn {
    background-color: var(--brand-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--brand-hover);
    box-shadow: 0 4px 12px var(--brand-glow);
}

.btn:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: #64748b;
}

.btn-secondary:hover {
    background-color: #475569;
    box-shadow: 0 4px 12px rgba(100, 116, 139, 0.15);
}

.btn-danger {
    background-color: #ef4444;
}

.btn-danger:hover {
    background-color: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
    border-radius: 6px;
}

/* ── Hulpklassen ────────────────────────────────────────────────────────── */

.hidden {
    display: none !important;
}

/* ── Laadindicator ──────────────────────────────────────────────────────── */

.loading {
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    margin: 40px auto;
    max-width: 450px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-left-color: var(--brand-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

/* ── Input velden ───────────────────────────────────────────────────────── */

input[type="text"] {
    padding: 12px 16px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    box-sizing: border-box;
    background-color: var(--input-bg);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s, color 0.2s;
    width: 100%;
}

input[type="text"]:focus {
    border-color: var(--brand-color);
    box-shadow: 0 0 0 3px var(--brand-glow);
}

/* ── Modal ──────────────────────────────────────────────────────────────── */

.modal-content {
    background-color: var(--modal-bg);
    border-radius: 16px;
    padding: 30px;
    max-width: 650px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 24px;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.75rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* ── Formulier ──────────────────────────────────────────────────────────── */

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
}

/* ── Kaartrijen (in de set-editor) ─────────────────────────────────────── */

.card-row {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    align-items: center;
}

.card-row input {
    flex: 1;
    padding: 10px 14px;
    font-size: 0.95rem;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

.card-row input:focus {
    border-color: var(--brand-color);
}

.remove-row-btn {
    background: none;
    border: none;
    color: #ef4444;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    transition: color 0.2s;
}

.remove-row-btn:hover {
    color: #b91c1c;
}

/* ── Custom Select Styles ───────────────────────────────────────────────── */
.custom-select-wrapper {
    position: relative;
    width: 100%;
}

.custom-select {
    width: 100%;
    padding: 10px 36px 10px 14px;
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.custom-select:focus {
    border-color: var(--brand-color);
    box-shadow: 0 0 0 3px var(--brand-glow);
}

.custom-select-wrapper::after {
    content: "\f0d7";
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

.container {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding: 30px 20px;
    box-sizing: border-box;
    transition: max-width 0.4s ease;
}

/* ── Home Page Specifieke Styling ─────────────────────────────────────── */
.container.wide {
    max-width: 1200px;
}

#firstTimeSetup {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    text-align: center;
    margin: 40px auto;
}

.dashboard-intro {
    background: var(--intro-bg);
    border: 1px solid var(--intro-border);
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.ai-banner {
    background: var(--ai-bg);
    border: 1px solid var(--ai-border);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.ai-banner-content {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    flex: 1;
    min-width: 280px;
}

.ai-banner-icon { font-size: 2.2rem; line-height: 1; }

.ai-banner-text h4 {
    margin: 0 0 6px 0;
    font-size: 1.15rem;
    color: var(--ai-text-h);
    font-weight: 700;
}

.ai-banner-text p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--ai-text-p);
    line-height: 1.5;
}

.welcome-title-container {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.welcome-title-container h2 {
    margin: 0;
    font-size: 1.8rem;
    color: var(--text-primary);
    font-weight: 700;
}

.edit-icon-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--input-border);
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.edit-icon-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.username-edit-form {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.username-edit-form input {
    padding: 8px 12px;
    font-size: 1rem;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-radius: 6px;
    width: 220px;
}

.section-title-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.section-title-bar h3 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

.sets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.set-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 140px;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background-color 0.2s;
    box-shadow: var(--shadow-sm);
}

.set-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--text-secondary);
}

.set-card-title {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 8px;
    word-break: break-word;
}

.set-card-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.set-card-actions { display: flex; gap: 10px; }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    background-color: var(--bg-secondary);
}

.empty-state-icon { font-size: 3.5rem; margin-bottom: 20px; color: var(--text-secondary); }
.empty-state-text { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 24px; }


/* ── Set Page Specifieke Styling ──────────────────────────────────────── */
.set-page-container {
    max-width: 1000px;
}

.set-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 30px;
}

.set-title-section h1 {
    margin: 0 0 8px 0;
    font-size: 2.2rem;
    color: var(--text-primary);
    font-weight: 800;
}

.set-meta {
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    gap: 15px;
}

.set-actions {
    display: flex;
    gap: 10px;
}

.study-section-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.study-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 45px;
}

.study-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease, background-color 0.2s, border-color 0.2s;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

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

.study-card-icon {
    font-size: 2.2rem;
}

.study-card-title {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
    margin: 0;
}

.terms-section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.terms-section-title h2 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.terms-count {
    background-color: var(--border-color);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
}

.terms-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 40px;
}

.term-row {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s, background-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

@media (hover: hover) {
    .term-row:hover {
        border-color: var(--brand-color);
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

    .term-card-actions .icon-btn:hover {
        background-color: var(--border-color);
        color: var(--text-primary);
        transform: translateY(-1px);
    }

    .term-card-actions .star-toggle-btn:hover {
        transform: scale(1.1);
    }
}

.term-main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: start;
}

.term-column {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.term-column.term-left {
    border-right: 1px solid var(--border-color);
    padding-right: 30px;
}

.column-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.term-text {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    word-break: break-word;
}

.term-card-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

.term-card-actions .icon-btn {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 6px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

@media (max-width: 640px) {
    .term-main-content {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .term-column.term-left {
        border-right: none;
        padding-right: 0;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 16px;
    }

    .term-text {
        font-size: 1.05rem;
    }
}

/* Practice / Exercise Styles */
.practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 15px;
}

.practice-info h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
}

.practice-info span {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.mode-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    background: none;
    border: none;
    padding: 10px 16px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--brand-color);
    border-bottom-color: var(--brand-color);
}

.panel {
    background-color: var(--card-bg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    padding: 30px;
    min-height: 350px;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: background-color 0.2s, border-color 0.2s;
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 24px;
}

.progress-bar {
    height: 100%;
    background-color: var(--brand-color);
    width: 0%;
    transition: width 0.3s ease;
}

.prompt-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-align: center;
}

.status-box {
    padding: 14px;
    border-radius: 8px;
    margin-top: 20px;
    font-weight: 600;
    text-align: center;
}

.status-box.correct {
    background-color: #dcfce7;
    color: #14532d;
    border: 1px solid #bbf7d0;
}

.status-box.incorrect {
    background-color: #fee2e2;
    color: #7f1d1d;
    border: 1px solid #fca5a5;
}

.flashcard-wrapper {
    perspective: 1000px;
    width: 100%;
    max-width: 500px;
    height: 300px;
    margin: 0 auto 30px auto;
    cursor: pointer;
}

.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
    border-radius: 16px;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
}

.card-front {
    background-color: var(--card-bg);
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
}

.card-back {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    transform: rotateY(180deg);
    border-color: var(--border-color);
}

.flashcard-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.choices-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 20px;
}

.choice-btn {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s, background-color 0.2s, border-color 0.2s;
    text-align: left;
}

.choice-btn:hover {
    border-color: var(--brand-color);
    background-color: var(--bg-primary);
}

.choice-btn.correct {
    background-color: #dcfce7 !important;
    border-color: #22c55e !important;
    color: #14532d !important;
}

.choice-btn.incorrect {
    background-color: #fee2e2 !important;
    border-color: #ef4444 !important;
    color: #7f1d1d !important;
}

.answer-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 450px;
    margin: 0 auto;
    width: 100%;
}

.answer-form input[type="text"] {
    padding: 14px 18px;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-primary);
    border-radius: 10px;
    outline: none;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.2s, background-color 0.2s;
}

.answer-form input[type="text"]:focus {
    border-color: var(--brand-color);
}

.test-question {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 25px;
}

.test-question:last-child {
    border-bottom: none;
}

.test-question-title {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.test-choices {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.test-radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.test-radio-label:hover {
    background-color: var(--bg-primary);
}

.completed-screen {
    text-align: center;
    padding: 40px 20px;
}

.completed-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.settings-popover {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: 290px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    box-shadow: var(--shadow-md), 0 10px 30px rgba(0, 0, 0, 0.08);
    padding: 18px;
    z-index: 150;
    display: flex;
    flex-direction: column;
    gap: 16px;
    opacity: 1;
    visibility: visible;
    transform-origin: top right;
    transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1), transform 0.2s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.2s;
}

.settings-popover.hidden {
    opacity: 0 !important;
    visibility: hidden !important;
    transform: scale(0.95) translateY(-8px);
    pointer-events: none;
    display: flex !important;
}

.settings-popover-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.settings-option {
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: opacity 0.2s ease;
}

.settings-option.hidden {
    display: none !important;
}

.settings-option:has(.switch) {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

.option-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.prompt-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1100;
}

.prompt-modal-content {
    background-color: var(--modal-bg);
    border-radius: 16px;
    padding: 30px;
    max-width: 450px;
    width: 90%;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    text-align: center;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.prompt-modal-actions {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 24px;
}

@media (max-width: 768px) {
    .dashboard-intro, .ai-banner { padding: 16px; margin-bottom: 20px; border-radius: 12px; }
    .ai-banner-content { gap: 10px; }
    .ai-banner-icon { font-size: 1.8rem; }
    .welcome-title-container h2 { font-size: 1.4rem; }
    
    .set-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .set-title-section h1 {
        font-size: 1.6rem;
    }

    .set-meta {
        font-size: 0.85rem;
        margin-bottom: 8px;
    }

    .set-actions {
        width: 100%;
    }

    .set-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .study-options-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .study-card {
        flex-direction: row;
        justify-content: flex-start;
        padding: 16px;
        gap: 16px;
        text-align: left;
        border-radius: 12px;
    }

    .study-card-icon {
        font-size: 1.8rem;
    }

    .study-card-title {
        font-size: 1.1rem;
    }

    .term-row {
        grid-template-columns: 1fr;
        gap: 8px;
        padding: 16px;
    }

    .term-word {
        border-right: none;
        padding-right: 0;
        border-bottom: 1px solid #f1f5f9;
        padding-bottom: 8px;
        font-size: 1rem;
    }

    .term-definition {
        font-size: 0.95rem;
    }

    .practice-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .practice-info h1 {
        font-size: 1.5rem;
    }

    .mode-tabs {
        gap: 5px;
        padding-bottom: 8px;
        margin-bottom: 20px;
        scrollbar-width: none;
    }

    .mode-tabs::-webkit-scrollbar {
        display: none;
    }

    .tab-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }

    .panel {
        padding: 20px 16px;
        min-height: auto;
    }

    .prompt-text {
        font-size: 1.25rem;
        margin-bottom: 16px;
    }

    .flashcard-wrapper {
        height: 250px;
        margin-bottom: 20px;
    }

    .card-front {
        font-size: 1.5rem;
    }

    .card-back {
        font-size: 1.3rem;
    }

    .choice-btn {
        padding: 14px;
        font-size: 1rem;
    }

    .settings-popover {
        right: auto;
        left: 0;
        transform-origin: top left;
    }
}

/* Save Indicator Styles */
.save-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: scale(0.9);
    pointer-events: none;
}

.save-indicator.visible {
    opacity: 1;
    transform: scale(1);
}

.save-indicator.saving {
    color: #3b82f6;
    border-color: rgba(59, 130, 246, 0.3);
    background-color: rgba(59, 130, 246, 0.05);
}

.save-indicator.saved {
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.3);
    background-color: rgba(16, 185, 129, 0.05);
}

.save-indicator.error {
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.3);
    background-color: rgba(239, 68, 68, 0.05);
}

.save-indicator .save-icon-spinner {
    animation: spin 1s linear infinite;
    display: inline-block;
}

/* PWA Download Buttons */
.pwa-download-btn-desktop {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--brand-color);
    color: white !important;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 10px var(--brand-glow);
    transition: all 0.2s ease;
}

.pwa-download-btn-desktop:hover {
    background-color: var(--brand-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(82, 135, 62, 0.3);
}

.pwa-download-btn-mobile {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
    transition: background-color 0.2s, color 0.2s;
}

.pwa-download-btn-mobile:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .pwa-download-btn-desktop {
        display: none !important;
    }
}

@media (min-width: 769px) {
    .pwa-download-btn-mobile {
        display: none !important;
    }
}