:root, html[data-theme="dark-green"] {
    --bg: #0D1512;
    --bg-card: #16211B;
    --bg-card-deep: #101915;
    --accent: #7FBFA0;
    --accent-soft: #5FA083;
    --accent-tint: rgba(127, 191, 160, 0.14);
    --bronze: #D9A15B;
    --seal: #C1443D;
    --seal-glow: rgba(193, 68, 61, 0.32);
    --text: #ECF2EE;
    --text-soft: #90A79A;
    --border-hair: rgba(127, 191, 160, 0.16);
    --border-hair-strong: rgba(127, 191, 160, 0.34);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.45);
    --shadow-lift: 0 20px 44px rgba(0, 0, 0, 0.55);
    color-scheme: dark;
}

html[data-theme="dark-indigo"] {
    --bg: #0B0F19;
    --bg-card: #151B2B;
    --bg-card-deep: #0E121E;
    --accent: #7D9DFF;
    --accent-soft: #5673D6;
    --accent-tint: rgba(125, 157, 255, 0.14);
    --bronze: #E2A24E;
    --seal: #D64B4B;
    --seal-glow: rgba(214, 75, 75, 0.32);
    --text: #E5E9F5;
    --text-soft: #8593B0;
    --border-hair: rgba(125, 157, 255, 0.14);
    --border-hair-strong: rgba(125, 157, 255, 0.3);
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-lift: 0 20px 44px rgba(0, 0, 0, 0.6);
    color-scheme: dark;
}

html[data-theme="pastel-lavender"] {
    --bg: #F4F1F7;
    --bg-card: #FFFFFF;
    --bg-card-deep: #ECE7F2;
    --accent: #785A94;
    --accent-soft: #5E4375;
    --accent-tint: rgba(120, 90, 148, 0.08);
    --bronze: #B88340;
    --seal: #BA4343;
    --seal-glow: rgba(186, 67, 67, 0.18);
    --text: #2B2333;
    --text-soft: #6E6478;
    --border-hair: rgba(120, 90, 148, 0.15);
    --border-hair-strong: rgba(120, 90, 148, 0.3);
    --shadow-soft: 0 10px 24px rgba(43, 35, 51, 0.05);
    --shadow-lift: 0 18px 36px rgba(43, 35, 51, 0.08);
    color-scheme: light;
}

html[data-theme="pastel-peach"] {
    --bg: #FAF3F0;
    --bg-card: #FFFFFF;
    --bg-card-deep: #F3E5DE;
    --accent: #C26646;
    --accent-soft: #A14E30;
    --accent-tint: rgba(194, 102, 70, 0.08);
    --bronze: #A37734;
    --seal: #A84646;
    --seal-glow: rgba(168, 70, 70, 0.18);
    --text: #362621;
    --text-soft: #7D6760;
    --border-hair: rgba(194, 102, 70, 0.15);
    --border-hair-strong: rgba(194, 102, 70, 0.3);
    --shadow-soft: 0 10px 24px rgba(54, 38, 33, 0.05);
    --shadow-lift: 0 18px 36px rgba(54, 38, 33, 0.08);
    color-scheme: light;
}

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

body {
    font-family: 'Manrope', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

button, input {
    font-family: inherit;
    outline: none;
    border: none;
}

button {
    cursor: pointer;
}

.app {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1.5rem;
}

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

.avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-hair-strong);
}

.profile-name {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.3px;
}

.profile-stats {
    font-size: 0.95rem;
    color: var(--text-soft);
}

.profile-stats b {
    color: var(--accent);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lang-switch {
    display: flex;
    background: var(--bg-card);
    border-radius: 20px;
    padding: 0.3rem;
    border: 1px solid var(--border-hair);
}

.lang-btn {
    background: transparent;
    color: var(--text-soft);
    padding: 0.5rem 1rem;
    border-radius: 16px;
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.lang-btn.active {
    background: var(--accent-tint);
    color: var(--accent);
}

.flag {
    font-size: 1.1rem;
}

.theme-toggle {
    background: var(--bg-card);
    color: var(--text);
    padding: 0.75rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-hair);
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--accent-tint);
    color: var(--accent);
    border-color: var(--accent);
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
    border-bottom: 2px solid var(--border-hair);
    padding-bottom: 1rem;
    overflow-x: auto;
}

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

.tab-btn {
    background: transparent;
    color: var(--text-soft);
    font-size: 1rem;
    font-weight: 700;
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text);
    background: var(--bg-card);
}

.tab-btn.active {
    color: var(--accent);
    background: var(--accent-tint);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.search-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    border-radius: 16px;
    flex-grow: 1;
    border: 1px solid var(--border-hair);
    transition: all 0.2s;
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-tint);
}

.search-box input {
    background: transparent;
    color: var(--text);
    width: 100%;
    font-size: 1.05rem;
    font-weight: 500;
}

.search-box input::placeholder {
    color: var(--text-soft);
}

.search-box svg {
    color: var(--text-soft);
}

.new-filter {
    background: var(--bg-card);
    color: var(--text-soft);
    padding: 1rem 1.5rem;
    border-radius: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--border-hair);
    transition: all 0.2s;
}

.new-filter:hover {
    background: var(--bg-card-deep);
}

.new-filter.active {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.result-count {
    font-size: 0.95rem;
    color: var(--text-soft);
    font-weight: 700;
    margin-left: auto;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
}

.word-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem 1.5rem;
    position: relative;
    border: 1px solid var(--border-hair);
    box-shadow: var(--shadow-soft);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.word-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lift);
    border-color: var(--border-hair-strong);
}

.word-card.is-new {
    border-color: var(--accent);
}

.homonym-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--bg-card-deep);
    color: var(--text-soft);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: bold;
    border: 1px solid var(--border-hair);
}

.new-badge {
    position: absolute;
    top: -12px;
    left: 1.5rem;
    background: var(--accent);
    color: var(--bg);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    letter-spacing: 0.5px;
}

.seal {
    display: none;
}

.word-kr {
    font-family: 'Gowun Batang', serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.75rem;
    line-height: 1.2;
}

.word-tr {
    font-size: 1.1rem;
    color: var(--text-soft);
    font-weight: 500;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 5rem 2rem;
    background: var(--bg-card);
    border-radius: 20px;
    border: 2px dashed var(--border-hair-strong);
    color: var(--text-soft);
    font-size: 1.2rem;
    font-weight: 600;
}

.big-kr {
    display: block;
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

#panel-grammar .grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.grammar-card {
    text-align: left;
    justify-content: flex-start;
    padding: 2rem;
    width: 100%;
}

.grammar-card .word-kr {
    font-size: 1.8rem;
    color: var(--bronze);
}

.quiz-wrap {
    max-width: 650px;
    margin: 0 auto;
    text-align: center;
}

.quiz-score {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--text-soft);
    background: var(--bg-card);
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    display: inline-block;
    border: 1px solid var(--border-hair);
    font-weight: 600;
}

.quiz-score b {
    color: var(--accent);
    font-weight: 800;
}

.quiz-score .score-wrong {
    color: var(--seal);
}

.stat-sep {
    margin: 0 0.75rem;
    opacity: 0.3;
}

.quiz-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 3rem 2rem;
    border: 1px solid var(--border-hair);
    box-shadow: var(--shadow-lift);
}

.quiz-prompt-label {
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1.5rem;
}

.quiz-prompt {
    font-family: 'Gowun Batang', serif;
    font-size: 4rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 3rem;
    line-height: 1.1;
}

.quiz-prompt.is-latin {
    font-family: 'Manrope', sans-serif;
    font-size: 2.5rem;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

@media (max-width: 600px) {
    .quiz-options { grid-template-columns: 1fr; }
}

.quiz-option {
    background: var(--bg-card-deep);
    color: var(--text);
    font-size: 1.15rem;
    font-weight: 700;
    padding: 1.25rem;
    border-radius: 16px;
    border: 2px solid var(--border-hair);
    transition: all 0.2s;
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--accent);
    background: var(--accent-tint);
    transform: translateY(-2px);
}

.quiz-option.kr-option {
    font-family: 'Gowun Batang', serif;
    font-size: 1.8rem;
    font-weight: 700;
}

.quiz-option:disabled {
    cursor: default;
    opacity: 0.6;
}

.quiz-option.correct {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
    opacity: 1;
}

.quiz-option.incorrect {
    background: var(--seal);
    color: var(--bg);
    border-color: var(--seal);
    opacity: 1;
}

.quiz-feedback {
    font-weight: 800;
    font-size: 1.2rem;
    min-height: 1.8rem;
    margin-bottom: 2rem;
}

.quiz-feedback.correct { color: var(--accent); }
.quiz-feedback.incorrect { color: var(--seal); }

.quiz-next {
    background: var(--text);
    color: var(--bg);
    font-size: 1.1rem;
    font-weight: 800;
    padding: 1rem 2.5rem;
    border-radius: 100px;
    display: none;
    margin: 0 auto;
    transition: transform 0.2s, box-shadow 0.2s;
}

.quiz-next:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.quiz-next.visible {
    display: inline-block;
    animation: fadeIn 0.3s;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid var(--border-hair);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-soft);
}

.stat-card-wide {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
    gap: 3rem;
}

@media (max-width: 768px) {
    .stat-card-wide {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
}

.stat-label {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.stat-value.small {
    font-size: 2.2rem;
}

.stat-value.kr {
    font-family: 'Gowun Batang', serif;
}

.stat-sub {
    font-size: 1rem;
    color: var(--text-soft);
    margin-top: 0.75rem;
    font-weight: 600;
}

.donut-wrap {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.donut-legend {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.donut-legend-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.05rem;
    font-weight: 600;
}

.donut-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
}

.bar-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bar-row {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.bar-row-label {
    font-family: 'Gowun Batang', serif;
    font-size: 1.4rem;
    font-weight: 700;
    width: 40px;
}

.profile-stats b {
    color: var(--accent);
}

.level-badge {
    display: inline-block;
    background: var(--accent-tint);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 800;
    margin-left: 6px;
    border: 1px solid var(--border-hair-strong);
    vertical-align: middle;
}

.bar-track {
    flex-grow: 1;
    height: 10px;
    background: var(--bg-card-deep);
    border-radius: 5px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 5px;
    transition: width 0.5s ease-out;
}

.bar-row-count {
    font-size: 1.1rem;
    font-weight: 800;
    width: 40px;
    text-align: right;
    color: var(--text-soft);
}