:root {
    --bg: #121213;
    --panel: #1c1c1e;
    --border: #3a3a3c;
    --text: #f7f7f8;
    --muted: #9a9a9c;
    --accent: #538d4e;
    --gray: #3a3a3c;
    --yellow: #b59f3b;
    --green: #538d4e;
    --key-bg: #818384;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: 1.25rem 1rem 0.5rem;
    border-bottom: 1px solid var(--border);
}

header h1 {
    margin: 0;
    font-size: 1.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.tagline {
    margin: 0.25rem 0 0.5rem;
    color: var(--muted);
    font-size: 0.95rem;
}

#mode-selector {
    display: flex;
    justify-content: center;
    gap: 0;
    margin: 0.75rem 0 0.5rem;
    background: var(--border);
    border-radius: 8px;
    padding: 4px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.mode-btn {
    padding: 0.5rem 1.2rem;
    font-size: 0.9rem;
    background: transparent;
    color: var(--muted);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 120ms ease, color 120ms ease;
}

.mode-btn:hover {
    color: var(--text);
}

.mode-btn.active {
    background: var(--accent);
    color: var(--text);
}

#target-input-container {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}

#target-input {
    padding: 0.5rem;
    font-size: 1rem;
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 4px;
    text-transform: lowercase;
}

#target-input::placeholder {
    color: var(--muted);
}

#target-set-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

main {
    flex: 1;
    display: grid;
    grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr);
    gap: 1.5rem;
    padding: 1.5rem;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
}

@media (max-width: 760px) {
    main { grid-template-columns: 1fr; }
}

#board-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

#board {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.row {
    display: grid;
    grid-template-columns: repeat(5, 58px);
    gap: 6px;
}

.cell {
    width: 58px;
    height: 58px;
    border: 2px solid var(--border);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    text-transform: uppercase;
    user-select: none;
    transition: background-color 120ms ease, border-color 120ms ease;
}

.row.active .cell {
    cursor: text;
}

.row.active .cell.filled {
    border-color: var(--muted);
    cursor: pointer;
}

.cell.state-b { background: var(--gray); border-color: var(--gray); }
.cell.state-y { background: var(--yellow); border-color: var(--yellow); }
.cell.state-g { background: var(--green); border-color: var(--green); }

#controls {
    display: flex;
    gap: 0.5rem;
}

button {
    font: inherit;
    font-weight: 600;
    background: var(--accent);
    color: var(--text);
    border: none;
    padding: 0.6rem 1.1rem;
    border-radius: 6px;
    cursor: pointer;
}

button:disabled {
    background: var(--gray);
    color: var(--muted);
    cursor: not-allowed;
}

button.secondary {
    background: var(--key-bg);
}

#status {
    color: var(--muted);
    min-height: 1.25em;
    margin: 0;
    text-align: center;
}

#status.error { color: #e06c75; }

#suggestions-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
}

.panel h2 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 0.5rem;
}

.panel h2 span {
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 400;
}

.panel ol,
.panel ul {
    margin: 0;
    padding-left: 1.25rem;
}

.panel li {
    padding: 2px 0;
    font-variant-numeric: tabular-nums;
}

.panel li .score {
    color: var(--muted);
    margin-left: 0.5rem;
    font-size: 0.9em;
}

.panel-hint {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 0.75rem;
    font-style: italic;
}

#remaining-preview {
    list-style: none;
    padding-left: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    max-height: 9rem;
    overflow-y: auto;
}

#remaining-preview li {
    background: #2a2a2c;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

footer {
    padding: 1rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

.chip {
    display: inline-block;
    padding: 2px 8px;
    margin: 0 4px;
    border-radius: 4px;
    color: #fff;
    font-size: 0.8rem;
}

.chip.state-b { background: var(--gray); }
.chip.state-y { background: var(--yellow); }
.chip.state-g { background: var(--green); }

.info-btn {
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 1rem;
    cursor: pointer;
    padding: 0;
    margin-left: auto;
    transition: color 120ms ease;
}

.info-btn:hover {
    color: var(--text);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-content h3 {
    margin: 0 0 1rem;
    font-size: 1.3rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.modal-content p {
    margin: 0.75rem 0;
    line-height: 1.5;
    color: var(--text);
}

.modal-content p:last-child {
    margin-bottom: 0;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 120ms ease;
}

.modal-close:hover {
    color: var(--text);
}