/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0a0a0f;
    --surface: #141420;
    --surface-2: #1c1c2e;
    --border: #2a2a40;
    --text: #e8e8f0;
    --text-muted: #9999b0;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --green: #00b894;
    --red: #e17055;
    --orange: #fdcb6e;
    --radius: 12px;
    --max-width: 600px;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100dvh;
}

h1, h2, .score-value, .timer-display {
    font-family: 'Unbounded', 'Inter', sans-serif;
}

a {
    color: var(--accent-light);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* === Screens === */
.screen {
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screen.hidden {
    display: none;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px 16px;
}

/* === Loading Screen === */
.loading-content {
    text-align: center;
}

.loading-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-content p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.progress-bar {
    width: 280px;
    height: 6px;
    background: var(--surface-2);
    border-radius: 3px;
    margin: 0 auto 8px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* === Input Screen === */
#input-screen .container {
    padding-top: 40px;
    padding-bottom: 40px;
}

header {
    text-align: center;
    margin-bottom: 32px;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.rules {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.rules span {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--surface-2);
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid var(--border);
}

/* === Timer === */
.timer-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
}

.timer-btn {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.timer-btn:hover {
    background: var(--surface);
    color: var(--text);
    border-color: var(--accent);
}

.timer-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.timer-display {
    font-size: 1.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--text);
    min-width: 60px;
}

.timer-display.hidden {
    display: none;
}

.timer-display.warning {
    color: var(--orange);
}

.timer-display.danger {
    color: var(--red);
}

/* === Word Inputs === */
.words-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.word-input-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0 14px;
    transition: border-color 0.2s;
}

.word-input-wrapper:focus-within {
    border-color: var(--accent);
}

.word-input-wrapper.valid {
    border-color: var(--green);
}

.word-input-wrapper.invalid {
    border-color: var(--red);
}

.word-input-wrapper.duplicate {
    border-color: var(--orange);
}

.word-number {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    min-width: 20px;
    text-align: center;
}

.word-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 1rem;
    padding: 14px 0;
    outline: none;
}

.word-input::placeholder {
    color: var(--border);
}

.word-input:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.word-input-wrapper:has(.word-input:disabled) {
    opacity: 0.5;
    pointer-events: none;
}

.validation-icon {
    font-size: 1.1rem;
    min-width: 20px;
    text-align: center;
}

.validation-msg {
    font-size: 0.75rem;
    color: var(--red);
    white-space: nowrap;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* === Form Footer === */
.form-footer {
    text-align: center;
}

.valid-count {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.valid-count span {
    font-weight: 700;
    color: var(--accent-light);
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #fff;
    border: none;
    padding: 14px 40px;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.2s;
    width: 100%;
    max-width: 320px;
}

.btn-primary:hover:not(:disabled) {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-secondary {
    display: inline-block;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 12px 32px;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    max-width: 320px;
}

.btn-secondary:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--accent);
}

/* === Result Screen === */
#result-screen .container {
    padding-top: 40px;
    padding-bottom: 60px;
}

.score-section {
    text-align: center;
    margin-bottom: 40px;
}

.score-display {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 4px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    background: var(--surface);
}

.score-value {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-label {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 320px;
    margin: 0 auto;
}

/* === Score Scale === */
.score-scale {
    max-width: 400px;
    margin: 24px auto 0;
}

.scale-bar {
    height: 8px;
    background: linear-gradient(90deg, var(--red), var(--orange), var(--green), var(--accent-light));
    border-radius: 4px;
    position: relative;
    margin-bottom: 8px;
}

.scale-marker {
    position: absolute;
    top: -6px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid var(--accent);
    transform: translateX(-50%);
    transition: left 0.5s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.scale-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* === Comparison === */
.comparison-section {
    margin-bottom: 32px;
}

.comparison-section h2 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    text-align: center;
}

.comparison-items {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.comparison-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
    padding: 12px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.comp-label {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.comp-score {
    font-weight: 700;
    font-size: 1.05rem;
}

/* === Heatmap === */
.heatmap-section {
    margin-bottom: 32px;
}

.heatmap-section h2 {
    font-size: 1.1rem;
    margin-bottom: 4px;
    text-align: center;
}

.heatmap-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.heatmap-table {
    border-collapse: collapse;
    margin: 0 auto;
}

.heatmap-table th {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: 6px 4px;
    max-width: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.heatmap-table th.row-header {
    text-align: right;
    padding-right: 8px;
}

.heatmap-table td {
    width: 40px;
    height: 40px;
    text-align: center;
    font-size: 0.65rem;
    font-weight: 500;
    border-radius: 4px;
    padding: 2px;
}

/* === Actions === */
.actions-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
}

/* === Info Section (inline, after actions) === */
.info-section {
    border-top: 1px solid var(--border);
    padding-top: 32px;
    margin-bottom: 32px;
}

.info-section h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    text-align: center;
}

.info-item {
    margin-bottom: 20px;
}

.info-item:last-child {
    margin-bottom: 0;
}

.info-item h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 4px;
}

.info-item p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.info-item p a {
    color: var(--accent-light);
}

/* Examples table */
.examples-table {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
}

.example-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
}

.example-pair {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.example-dist {
    font-weight: 700;
    font-size: 0.9rem;
    font-variant-numeric: tabular-nums;
}

.example-row.close .example-dist {
    color: #6c3d91;
}

.example-row.medium .example-dist {
    color: #2d8a6e;
}

.example-row.far .example-dist {
    color: var(--green);
}

/* === Disclaimer === */
.disclaimer {
    text-align: center;
    margin-top: 32px;
}

.disclaimer p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

/* === Toast === */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-2);
    color: var(--text);
    padding: 12px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 0.9rem;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
}

/* === Responsive === */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.4rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .score-display {
        width: 130px;
        height: 130px;
    }

    .score-value {
        font-size: 2.5rem;
    }

    .score-label {
        font-size: 1.05rem;
    }

    .heatmap-table td {
        width: 36px;
        height: 36px;
        font-size: 0.65rem;
    }

    .heatmap-table th {
        font-size: 0.65rem;
    }

    .info-item h3 {
        font-size: 0.95rem;
    }

    .info-item p {
        font-size: 0.9rem;
    }

    .validation-msg {
        display: none;
    }
}