:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --dark-bg: #0f172a;
    --card-bg: #1e293b;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, #1e1b4b 100%);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.hidden {
    display: none !important;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 30px 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    margin-bottom: 30px;
}

.header-content h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.header-content p {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Sections */
.section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.section h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.section-desc {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Status banner — warming up must not read as broken */
.status-banner {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    font-size: 0.95rem;
    border: 1px solid;
}

.status-banner.warming {
    background: rgba(245, 158, 11, 0.12);
    border-color: var(--warning-color);
    color: #fcd34d;
}

.status-banner.error {
    background: rgba(236, 72, 153, 0.12);
    border-color: var(--accent-color);
    color: #f9a8d4;
}

.status-banner i {
    margin-top: 3px;
    flex-shrink: 0;
}

/* Language bar */
.lang-bar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 16px;
    align-items: end;
    margin-bottom: 22px;
}

.lang-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
}

.lang-field label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.lang-field select {
    width: 100%;
    padding: 12px 14px;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    cursor: pointer;
}

.lang-field select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.detected-note {
    font-size: 0.8rem;
    color: var(--success-color);
    min-height: 1.1rem;
}

.swap-btn {
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    color: var(--text-muted);
    border-radius: 50%;
    width: 46px;
    height: 46px;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
    margin-bottom: 22px;
}

.swap-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: rotate(180deg);
}

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

/* Text panes */
.panes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.pane {
    display: flex;
    flex-direction: column;
}

.pane-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    min-height: 32px;
}

.pane-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.char-count {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.char-count.near {
    color: var(--warning-color);
}

.char-count.over {
    color: var(--accent-color);
    font-weight: 600;
}

#source-text {
    width: 100%;
    padding: 16px;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-color);
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    min-height: 210px;
}

#source-text:focus {
    outline: none;
    border-color: var(--primary-color);
}

.output {
    flex: 1;
    padding: 16px;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    min-height: 210px;
    font-size: 1rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-y: auto;
}

.output.filled {
    border-color: rgba(99, 102, 241, 0.5);
}

.output-placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.output-error {
    color: #f9a8d4;
}

/* Working state — set expectations rather than hide the wait */
.working {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
}

.working .elapsed {
    font-variant-numeric: tabular-nums;
    color: var(--primary-color);
    font-weight: 600;
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

.copy-btn.copied {
    border-color: var(--success-color);
    color: var(--success-color);
}

/* Actions */
.action-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 22px;
    flex-wrap: wrap;
}

.primary-btn {
    padding: 13px 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.primary-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.action-note {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Metrics */
.metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.metric {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 6px 15px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.metric strong {
    color: var(--text-color);
    font-variant-numeric: tabular-nums;
}

.metric i {
    color: var(--primary-color);
    margin-right: 6px;
}

/* Examples */
.example-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.example-chip {
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 22px;
    padding: 9px 18px;
    color: var(--text-color);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.example-chip:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.example-chip .chip-langs {
    color: var(--text-muted);
    font-size: 0.78rem;
    margin-left: 8px;
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.about-card {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
}

.about-card h3 {
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.about-card h3 i {
    color: var(--primary-color);
    margin-right: 8px;
}

.about-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.licence-note {
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.licence-note i {
    color: var(--primary-color);
    margin-right: 8px;
}

.licence-note a {
    color: #a5b4fc;
}

.loading {
    color: var(--text-muted);
    padding: 10px 0;
}

/* Responsive */
@media (max-width: 900px) {
    .panes {
        grid-template-columns: 1fr;
    }

    .lang-bar {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .swap-btn {
        margin: 0 auto;
        transform: rotate(90deg);
    }

    .swap-btn:hover:not(:disabled) {
        transform: rotate(270deg);
    }
}

@media (max-width: 640px) {
    .header-content h1 {
        font-size: 1.8rem;
    }

    .section {
        padding: 20px;
    }

    .primary-btn {
        width: 100%;
    }
}