/* ============================================================
   Text Compression Lab — stylesheet
   Theme: dark "data console" look, echoing the debug-console
   tool (terminal.js) so tools across the site feel related.
   ============================================================ */

:root {
    --bg: #0b1220;
    --panel: #0f172a;
    --panel-header: #1e293b;
    --border: #263449;
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --accent: #fbbf24;      /* amber — actions, symbols */
    --accent-2: #38bdf8;    /* cyan — success / lossless */
    --danger: #fb7185;      /* rose — mismatch / errors */
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 24px 20px 40px;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
}

header {
    max-width: 1100px;
    margin: 0 auto 24px;
    text-align: center;
}

h1 {
    margin: 0 0 6px;
    font-size: 1.8rem;
    letter-spacing: 0.02em;
}

header p {
    margin: 0;
    color: var(--text-dim);
    font-size: 0.95rem;
}

main {
    max-width: 1100px;
    margin: 0 auto;
}

/* ---------------- controls ---------------- */

.controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 18px;
}

.secondary-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: flex-end;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1 1 220px;
}

.field.full-width {
    flex-basis: 100%;
}

label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

input[type="text"],
select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 10px;
    font-family: var(--mono);
    font-size: 0.9rem;
}

input[type="text"]:focus,
select:focus,
textarea:focus,
button:focus-visible {
    outline: 2px solid var(--accent-2);
    outline-offset: 1px;
}

.sequence-lines {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
    margin-bottom: 8px;
}

.sequence-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.sequence-row .sequence-input {
    flex: 1 1 auto;
}

.remove-line-btn {
    flex: 0 0 auto;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    border-radius: 6px;
    width: 34px;
    height: 34px;
    padding: 0;
    font-size: 1rem;
    line-height: 1;
}

.remove-line-btn:hover {
    background: var(--danger);
    color: #2a0a10;
    border-color: var(--danger);
}

.button-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    background: var(--accent);
    color: #1a1305;
    border: none;
    border-radius: 6px;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

button:hover {
    background: #f7b100;
}

button.secondary {
    background: var(--panel-header);
    color: var(--text);
    border: 1px solid var(--border);
}

button.secondary:hover {
    background: #27334a;
}

button.small {
    padding: 6px 12px;
    font-size: 0.8rem;
    align-self: flex-start;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button:disabled:hover {
    background: var(--panel-header);
}

/* ---------------- status strip ---------------- */

.status {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 18px;
}

.status-card {
    flex: 1 1 200px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 16px;
}

.status-card .label {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

.status-card .value {
    font-size: 1.4rem;
    font-weight: 700;
    font-family: var(--mono);
}

.value.neutral { color: var(--text-dim); }
.value.good { color: var(--accent-2); }
.value.bad { color: var(--danger); }

/* ---------------- panels ---------------- */

.panels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

@media (max-width: 900px) {
    .panels {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    background: var(--panel-header);
    padding: 8px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
}

.panel textarea {
    flex: 1 1 auto;
    min-height: 340px;
    resize: vertical;
    background: transparent;
    color: var(--text);
    border: none;
    padding: 12px;
    font-family: var(--mono);
    font-size: 0.82rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
}

.panel textarea:disabled {
    color: var(--text-dim);
}

footer {
    max-width: 1100px;
    margin: 22px auto 0;
    color: var(--text-dim);
    font-size: 0.8rem;
    line-height: 1.6;
}

footer code {
    font-family: var(--mono);
    background: var(--panel);
    padding: 1px 5px;
    border-radius: 4px;
}

/* ============================================================
   Score Keeper
   ============================================================ */

.scoreboard {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 18px;
}

.scoreboard-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 10px;
}

.scoreboard-header h2 {
    margin: 0;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

.final-score {
    font-family: var(--mono);
    font-weight: 700;
    color: var(--accent);
    font-size: 0.95rem;
}

.leaderboard {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

@media (max-width: 700px) {
    .leaderboard {
        grid-template-columns: 1fr;
    }
}

.leaderboard li {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 0.85rem;
}

.leaderboard li.empty-slot {
    color: var(--text-dim);
    justify-content: center;
    align-items: center;
    font-style: italic;
}

.leaderboard-top-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.leaderboard .medal {
    font-size: 1.2rem;
}

.leaderboard .leaderboard-song {
    font-weight: 600;
}

.leaderboard .leaderboard-score {
    color: var(--text-dim);
    font-family: var(--mono);
    font-size: 0.8rem;
}

.scoreboard-note {
    margin: 10px 0 0;
    color: var(--text-dim);
    font-size: 0.82rem;
}

/* ============================================================
   Song switcher
   ============================================================ */

.song-switcher {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}

.song-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--panel);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
}

.song-tab:hover {
    border-color: var(--accent-2);
}

.song-tab.active {
    background: var(--panel-header);
    border-color: var(--accent);
}

.song-tab-badge {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 999px;
}

.badge-neutral {
    background: var(--bg);
    color: var(--text-dim);
    border: 1px solid var(--border);
}

.badge-low {
    background: rgba(251, 113, 133, 0.15);
    color: var(--danger);
}

.badge-good {
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent-2);
}

.badge-elite {
    background: rgba(251, 191, 36, 0.18);
    color: var(--accent);
}