:root {
    --bg: #0D1117;
    --panel: rgba(22, 27, 34, 0.7);
    --panel-border: rgba(255, 255, 255, 0.12);
    --muted: #8B949E;
    --text: #C9D1D9;
    --accent: #58A6FF;
    --accent-2: #3FB950;
    --danger: #F85149;
    --radius: 16px;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

* {
    box-sizing: border-box
}

html,
body {
    height: 100%
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    overflow-y: overlay
}

.glass {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px)
}

header.app-header {
    padding: 32px;
    margin: 16px;
    text-align: center;
    background: radial-gradient(600px 300px at 50% -30%, rgba(88, 166, 255, 0.2), transparent 60%),
                radial-gradient(300px 200px at 10% 30%, rgba(63, 185, 80, 0.2), transparent 70%),
                linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
}

.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.brand .logo {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.brand .title {
    font-weight: 700;
    letter-spacing: .2px;
    font-size: clamp(24px, 2.5vw, 32px);
    margin: 0;
}

.subtle {
    color: var(--muted)
}

.layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 16px;
    padding: 0 16px 24px
}

.layout > aside, .layout > section {
    padding: 1.25rem;
}

@media (max-width: 992px) {
    .layout {
        grid-template-columns: 1fr
    }
}

.levels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px
}

.level-btn {
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    font-weight: 600;
    letter-spacing: .2px;
    cursor: pointer;
    transition: all .15s ease;
}

.level-btn:hover {
    transform: translateY(-1px);
    border-color: rgba(255,255,255,0.2);
    background: rgba(255, 255, 255, 0.08);
}

.level-btn.active {
    background: rgba(88, 166, 255, 0.15);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 15px -3px rgba(88, 166, 255, 0.3);
}

.search input {
    width: 100%;
    padding: 10px 12px 10px 38px;
    border-radius: 12px;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    transition: all .15s ease;
}

.search input:focus {
    background: rgba(255, 255, 255, .08);
    border-color: var(--accent);
    box-shadow: none;
}

.search .icon {
    position: absolute;
    left: 12px;
    top: 8px;
    color: var(--muted)
}

.cat-item .cat-btn {
    width: 100%;
    text-align: left;
    cursor: pointer;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    transition: all .15s ease;
    color: var(--text);
}

.cat-item .cat-btn:hover {
    border-color: var(--panel-border);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-1px)
}

.count {
    color: var(--muted);
    font-size: 12px;
    margin-left: 8px
}

.word-card {
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 12px 16px;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 10px;
    transition: all .15s ease;
}

.word-card:hover {
    border-color: rgba(255,255,255,0.2);
    background: rgba(255, 255, 255, 0.07);
}

.word-en {
    font-weight: 600;
    letter-spacing: .2px;
    font-size: 16px
}

.word-pl {
    color: var(--muted)
}

.pill {
    padding: 8px 10px;
    border-radius: 12px;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    transition: all .15s ease;
}

.pill:hover {
    transform: translateY(-1px);
    border-color: rgba(255,255,255,0.2);
    background: rgba(255, 255, 255, 0.08);
}

.pill.active {
    border-color: var(--accent);
    background: rgba(88, 166, 255, 0.15);
    color: var(--accent);
    box-shadow: 0 0 15px -2px rgba(88, 166, 255, 0.3);
}

.controls-wrapper {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.control-group {
    display: flex;
    gap: 2px;
    padding: 4px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
}

.control-group .pill {
    border: none;
    background: transparent;
    box-shadow: none;
}

.control-group .pill:hover {
    background: rgba(255,255,255,0.1);
}

.control-group .pill.active {
    background: rgba(88, 166, 255, 0.2);
    color: var(--accent);
}

.view-tabs .pill {
    display: flex;
    align-items: center;
    gap: 6px
}

.progress-wrap {
    display: flex;
    align-items: center;
    gap: 8px
}

.progress {
    height: 10px;
    background: rgba(255, 255, 255, .08);
    border-radius: 999px
}

.view-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap
}

.view-tabs .pill {
    display: flex;
    align-items: center;
    gap: 6px
}

.quiz-card {
    text-align: center;
    padding: 28px;
    border-radius: 16px;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.03);
}

.quiz-word-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: .5rem;
}

.quiz-word {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
}

.word-card .speak-btn,
.quiz-word-wrapper .speak-btn {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, .08);
    color: var(--text);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all .2s;
}

.word-card .speak-btn:hover,
.quiz-word-wrapper .speak-btn:hover {
    border-color: var(--accent);
    background: rgba(88, 166, 255, 0.1);
    color: var(--accent);
}

.word-card .word-en {
    display: flex;
    align-items: center;
    gap: 10px;
}

.quiz-translation {
    color: var(--muted);
    font-size: 18px;
    margin-top: 6px;
    display: none
}

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

@media (min-width:600px) {
    .mcq-grid {
        grid-template-columns: 1fr 1fr
    }
}

.mcq-btn {
    padding: 12px;
    border-radius: 12px;
    border: 1px solid var(--panel-border);
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    color: var(--text);
    transition: all .15s ease;
    font-weight: 600;
}

.mcq-btn:hover {
    border-color: rgba(255,255,255,0.2);
    background: rgba(255, 255, 255, 0.08);
}

.mcq-btn.correct {
    border-color: var(--accent-2);
    background: rgba(63, 185, 80, 0.15);
    color: #fff;
}

.mcq-btn.wrong {
    border-color: var(--danger);
    background: rgba(248, 81, 73, 0.15);
    color: #fff;
    opacity: 0.7;
}

#inputAnswer {
    background: rgba(255, 255, 255, .04);
    border: 1px solid var(--panel-border);
    color: var(--text);
    transition: all .2s;
}

#inputAnswer:focus {
    background: rgba(255, 255, 255, .08);
    border-color: var(--accent);
    box-shadow: none;
}

#inputAnswer.correct {
    border-color: #22c55e;
    background: rgba(34, 197, 94, .12);
}

#inputAnswer.wrong {
    border-color: #ef4444;
    background: rgba(239, 68, 68, .12);
}

#inputCorrectAnswer {
    color: #22c55e;
    font-weight: 700;
}

.stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap
}

.stat-chip {
    padding: 8px 10px;
    border-radius: 12px;
    background: rgba(255, 255, 255, .06);
    border: 1px solid var(--panel-border)
}

/* Examples under translation */
.example-block {
    margin-top: 8px;
    font-size: 14px;
}

.example-en {
    font-style: italic;
}

.example-pl {
    color: var(--muted);
}

/* Fullscreen helper */
.fs-active {
    background: rgba(255, 255, 255, .08);
}

::selection {
    background: rgba(96, 165, 250, .35)
}

::-webkit-scrollbar {
    width: 12px
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, .08);
    border-radius: 999px;
    border: 3px solid rgba(0, 0, 0, 0)
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, .16)
}

/* Recruitment Form */
#recruitmentForm .form-control {
    background: rgba(255, 255, 255, .04);
    border: 1px solid var(--panel-border);
    color: var(--text);
    border-radius: 12px;
    padding: 10px 12px;
}

#recruitmentForm .form-control:focus {
    background: rgba(255, 255, 255, .08);
    border-color: var(--accent);
    box-shadow: none;
}

#recruitmentForm .form-label {
    font-weight: 600;
    margin-bottom: .5rem;
}

#generatedContent {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    min-height: 300px;
    max-height: 50vh;
    overflow-y: auto;
}

#searchHistory .list-group-item {
    background-color: transparent;
    border-color: var(--panel-border);
    color: var(--text);
}