:root {
    --paper: #f6f0e8;
    --ink: #1d2430;
    --muted: #5b6676;
    --sky: #a8c6ea;
    --sky-deep: #6f8fb3;
    --sun: #f2a65a;
    --card: rgba(255, 250, 243, 0.9);
    --line: rgba(29, 36, 48, 0.12);
    --success: #2f7d57;
    --warning: #a25222;
    --shadow: 0 24px 60px rgba(43, 57, 77, 0.18);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    font-family: "Avenir Next", "Trebuchet MS", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.75), transparent 28%),
        radial-gradient(circle at bottom right, rgba(242, 166, 90, 0.18), transparent 30%),
        linear-gradient(160deg, #cfe0f5 0%, #b9d0eb 42%, #f0dec7 100%);
}

.page-shell {
    width: min(1180px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 28px 0 40px;
}

.hero {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    align-items: end;
    padding: 20px 24px 28px;
}

.eyebrow {
    margin: 0 0 10px;
    color: var(--sky-deep);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

h1,
h2,
.output-value,
.stat-value {
    font-family: Georgia, "Times New Roman", serif;
}

h1 {
    margin: 0;
    font-size: clamp(2.6rem, 4vw, 4.6rem);
    line-height: 0.96;
}

.hero-copy {
    max-width: 58ch;
    margin: 14px 0 0;
    color: var(--muted);
    font-size: 1.02rem;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.game-layout {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 18px;
}

.game-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 28px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.score-card {
    grid-column: 1;
}

.board-card {
    grid-column: 2;
}

.notes-card {
    grid-column: 1 / -1;
}

.score-card {
    padding: 26px;
    animation: rise-in 0.55s ease-out both;
}

.board-card {
    padding: 24px;
    animation: rise-in 0.65s ease-out both;
}

.notes-card {
    padding: 24px;
    animation: rise-in 0.75s ease-out both;
}

.score-row,
.hint-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: end;
}

.mode-panel {
    display: grid;
    gap: 14px;
    margin-bottom: 22px;
    padding: 18px;
    border-radius: 22px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(226, 236, 248, 0.52));
    border: 1px solid rgba(29, 36, 48, 0.08);
}

.mode-toggle {
    display: inline-flex;
    padding: 6px;
    gap: 6px;
    border-radius: 999px;
    background: rgba(29, 36, 48, 0.06);
    flex-wrap: wrap;
}

.mode-button {
    padding: 10px 18px;
    border-radius: 999px;
    background: transparent;
    color: var(--muted);
    font-weight: 700;
}

.mode-button.is-active {
    background: linear-gradient(180deg, #243347, #172130);
    color: #fffaf0;
    box-shadow: 0 10px 22px rgba(23, 33, 48, 0.2);
}

.mode-description {
    margin: 0;
    color: var(--muted);
    line-height: 1.55;
}

.align-right {
    text-align: right;
}

.label {
    margin: 0 0 6px;
    color: var(--muted);
    font-size: 1.06rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.stat-value {
    margin: 0;
    font-size: clamp(2.5rem, 3.8vw, 3.6rem);
}

.display-panel {
    margin: 24px 0 20px;
    padding: 28px 22px;
    border-radius: 24px;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.82), rgba(255, 248, 239, 0.88)),
        linear-gradient(180deg, rgba(168, 198, 234, 0.24), rgba(242, 166, 90, 0.1));
    border: 1px solid rgba(29, 36, 48, 0.08);
}

.dual-display-panel {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: end;
}

.dual-display-panel > div {
    flex: 1;
    min-width: 0;
}

.value-block {
    min-width: 0;
}

.output-value {
    margin: 0;
    font-size: clamp(3.8rem, 6vw, 6rem);
    line-height: 0.95;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.hint-count {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
}

.hint-row .label,
.hint-row .hint-count {
    white-space: nowrap;
}

.hint-controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 22px;
}

.compact-action-button {
    padding: 10px 10px;
    font-size: 0.82rem;
    border-radius: 14px;
    line-height: 1.15;
}

.board-header h2,
.notes-card h2 {
    margin: 0;
    font-size: 1.55rem;
}

.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.board-header p {
    margin: 8px 0 0;
    color: var(--muted);
}

.choices-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}

button {
    border: none;
    border-radius: 18px;
    cursor: pointer;
    transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease, background 180ms ease;
    font: inherit;
}

button:hover:not(:disabled) {
    transform: translateY(-2px);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.choice-button {
    min-height: 98px;
    padding: 20px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(224, 236, 248, 0.9));
    color: var(--ink);
    box-shadow: inset 0 -8px 18px rgba(111, 143, 179, 0.12);
    font-size: 1.85rem;
    font-weight: 700;
}

.accent-button,
.ghost-button {
    padding: 14px 18px;
    font-weight: 700;
}

.accent-button {
    background: linear-gradient(180deg, #243347, #172130);
    color: #fffaf0;
    box-shadow: 0 14px 28px rgba(23, 33, 48, 0.18);
}

.ghost-button {
    background: linear-gradient(180deg, #243347, #172130);
    color: #fffaf0;
    box-shadow: 0 14px 28px rgba(23, 33, 48, 0.18);
}

.puzzle-controls {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.message-banner {
    margin-top: 16px;
    padding: 16px 18px;
    border-radius: 18px;
    background: rgba(168, 198, 234, 0.24);
    color: var(--ink);
    font-weight: 600;
}

.inline-message-banner {
    flex: 1;
    min-width: 0;
    margin-top: 0;
    align-self: stretch;
    display: flex;
    align-items: center;
}

.hint-panel {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid rgba(29, 36, 48, 0.08);
}

.notes-card ul {
    padding-left: 20px;
    color: var(--muted);
    line-height: 1.65;
}

.tutorial-link {
    display: inline-flex;
    margin-top: 10px;
    text-decoration: none;
}

.tutorial-button {
    padding: 14px 34px;
    font-size: 1.24rem;
    border-radius: 20px;
    margin-top: 0;
}

.delay-modal {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 24px;
    background: rgba(23, 33, 48, 0.45);
    z-index: 50;
}

.delay-modal.hidden {
    display: none;
}

.delay-panel {
    width: min(460px, 100%);
    padding: 28px;
    border-radius: 28px;
    background: #fff8ef;
    box-shadow: var(--shadow);
}

.delay-panel h2 {
    margin: 0 0 8px;
}

.delay-panel p {
    color: var(--muted);
}

.progress-track {
    height: 16px;
    border-radius: 999px;
    overflow: hidden;
    background: rgba(29, 36, 48, 0.08);
}

.progress-bar {
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--sun), #ef7f58);
    transition: width 1s linear;
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(22px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 920px) {
    .hero,
    .score-row,
    .hint-row,
    .dual-display-panel {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions {
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .game-layout {
        grid-template-columns: 1fr;
    }

    .mode-toggle {
        width: 100%;
        justify-content: stretch;
    }

    .mode-button {
        flex: 1;
    }

    .score-card,
    .board-card,
    .notes-card {
        grid-column: auto;
    }
}

@media (max-width: 640px) {
    .game-card {
        box-shadow: 0 10px 24px rgba(43, 57, 77, 0.1);
        backdrop-filter: none;
    }

    .page-shell {
        width: min(100vw - 20px, 100%);
        padding: 10px 0 18px;
    }

    .hero {
        gap: 12px;
        padding: 10px 6px 14px;
    }

    .eyebrow {
        margin-bottom: 6px;
        font-size: 0.7rem;
    }

    h1 {
        font-size: clamp(1.7rem, 8vw, 2.3rem);
    }

    .hero-copy {
        margin-top: 8px;
        font-size: 0.88rem;
        line-height: 1.35;
    }

    .hero-actions {
        width: 100%;
        gap: 8px;
    }

    .hero-actions button {
        flex: 1;
    }

    .score-card,
    .board-card,
    .notes-card {
        border-radius: 20px;
    }

    .score-card,
    .board-card,
    .notes-card {
        padding: 14px;
    }

    .mode-panel {
        gap: 10px;
        margin-bottom: 14px;
        padding: 12px;
        border-radius: 16px;
    }

    .mode-button {
        padding: 8px 10px;
        font-size: 0.9rem;
    }

    .mode-description,
    .board-header p,
    .notes-card ul,
    .tutorial-link,
    .message-banner {
        font-size: 0.9rem;
        line-height: 1.35;
    }

    .label {
        margin-bottom: 4px;
        font-size: 0.82rem;
    }

    .score-row {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
        gap: 10px;
        align-items: stretch;
    }

    .stat-value {
        font-size: clamp(1.7rem, 7vw, 2.2rem);
    }

    .display-panel {
        margin: 14px 0 12px;
        padding: 12px 10px;
        border-radius: 18px;
    }

    .dual-display-panel {
        flex-direction: row;
        align-items: end;
        justify-content: space-between;
        gap: 8px;
    }

    .dual-display-panel > div,
    .value-block {
        flex: 1 1 0;
        min-width: 0;
    }

    .dual-display-panel .label {
        white-space: nowrap;
        font-size: 0.7rem;
        letter-spacing: 0.02em;
    }

    .output-value {
        font-size: clamp(1.45rem, 7.2vw, 2.05rem);
        line-height: 1.02;
    }

    .hint-count {
        font-size: 1.3rem;
    }

    .hint-row {
        flex-direction: row;
        align-items: end;
        justify-content: space-between;
        gap: 8px;
    }

    .hint-row > div {
        flex: 1 1 0;
        min-width: 0;
    }

    .hint-row .label {
        white-space: nowrap;
        font-size: 0.7rem;
        letter-spacing: 0.02em;
    }

    .hint-row .hint-count {
        font-size: clamp(1.45rem, 7.2vw, 2.05rem);
        line-height: 1.02;
    }

    .hint-controls,
    .puzzle-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }

    .hint-controls {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .compact-action-button {
        padding: 9px 8px;
        font-size: 0.72rem;
        border-radius: 12px;
    }

    .board-header h2,
    .notes-card h2 {
        font-size: 1.2rem;
    }

    .choices-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
        margin-top: 12px;
    }

    .choice-button {
        min-height: 62px;
        padding: 10px 8px;
        border-radius: 14px;
        font-size: 1.05rem;
    }

    .accent-button,
    .ghost-button {
        padding: 11px 12px;
        border-radius: 14px;
        font-size: 0.9rem;
    }

    .message-banner {
        margin-top: 12px;
        padding: 12px 14px;
        border-radius: 14px;
    }

    .inline-message-banner {
        margin-top: 0;
        padding: 10px 12px;
        white-space: normal;
        overflow-wrap: anywhere;
    }

    .notes-card ul {
        margin: 10px 0 0;
        padding-left: 18px;
    }

    .score-card,
    .board-card,
    .notes-card {
        animation: none;
    }
}

@media (max-width: 420px) {
    .hero-copy {
        font-size: 0.82rem;
    }

    .score-row {
        grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
        gap: 8px;
    }

    .dual-display-panel {
        gap: 6px;
    }

    .output-value {
        font-size: clamp(1.2rem, 6.8vw, 1.6rem);
    }

    .hint-row {
        gap: 6px;
    }

    .hint-row .hint-count {
        font-size: clamp(1.2rem, 6.8vw, 1.6rem);
    }

    .choice-button {
        min-height: 56px;
        font-size: 0.94rem;
    }

    .inline-message-banner {
        font-size: 0.82rem;
        padding: 9px 10px;
    }

    .hint-controls,
    .puzzle-controls {
        grid-template-columns: 1fr;
    }

    .hint-controls {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .compact-action-button {
        padding: 8px 6px;
        font-size: 0.65rem;
    }
}