:root {
    --bg: #0f1a14;
    --bg-gradient: linear-gradient(145deg, #0f1a14 0%, #1a2e24 50%, #0d1520 100%);
    --panel: rgba(28, 42, 36, 0.92);
    --panel-border: rgba(120, 180, 140, 0.15);
    --text: #e8f0ea;
    --text-muted: #8fa898;
    --accent: #6ecf8a;
    --accent-dim: #4a9e62;
    --accent-glow: rgba(110, 207, 138, 0.25);
    --mulch: #c9a227;
    --mulch-glow: rgba(201, 162, 39, 0.2);
    --danger: #e85d5d;
    --canvas-border: rgba(110, 207, 138, 0.35);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --font: "DM Sans", system-ui, -apple-system, sans-serif;
    --mono: "JetBrains Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg-gradient);
    background-attachment: fixed;
}

.header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--panel-border);
    background: rgba(15, 26, 20, 0.85);
    backdrop-filter: blur(8px);
}

.title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.version {
    font-size: 0.75em;
    font-weight: 600;
    color: var(--accent);
    vertical-align: middle;
}

.stats-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.stat-value {
    font-family: var(--mono);
    font-size: 1rem;
    font-weight: 600;
}

.stat-value.accent {
    color: var(--mulch);
}

.super-ticks {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--accent);
    padding: 0.35rem 0.75rem;
    background: var(--accent-glow);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(110, 207, 138, 0.3);
}

.super-ticks:empty {
    display: none;
}

.game-layout {
    display: grid;
    grid-template-columns: 280px minmax(220px, 280px) 1fr minmax(220px, 280px);
    gap: 1.25rem;
    padding: 1.25rem 1.5rem;
    max-width: 1680px;
    margin: 0 auto;
    align-items: start;
}

.panel-stages {
    width: 280px;
    min-height: 548px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.stage-menu {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    flex: 1;
    overflow: hidden;
}

.stage-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    width: 100%;
    min-width: 0;
    flex-shrink: 0;
    padding: 0.55rem 0.85rem;
    font-family: var(--font);
    font-size: 0.88rem;
    text-align: left;
    color: var(--text);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    overflow: hidden;
    transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

.stage-item:hover:not(:disabled) {
    background: rgba(110, 207, 138, 0.1);
    border-color: rgba(110, 207, 138, 0.25);
    transform: translateY(-1px);
}

.stage-item:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.stage-item.is-active {
    background: rgba(110, 207, 138, 0.18);
    border-color: rgba(110, 207, 138, 0.45);
    box-shadow: 0 0 12px var(--accent-glow);
}

.stage-item.is-locked .stage-item-name {
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.stage-item-name {
    font-weight: 600;
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.stage-item-meta {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.stage-item.is-locked .stage-item-meta {
    color: var(--accent);
}

.stage-item.is-active .stage-item-meta {
    color: var(--accent);
}

.panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.panel-title {
    margin: 0 0 0.25rem;
    font-size: 1rem;
    font-weight: 600;
}

.panel-subtitle {
    margin: 0 0 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.upgrade-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.upgrade-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.upgrade-detail {
    font-size: 0.78rem;
    color: var(--text-muted);
    padding-left: 0.25rem;
}

.canvas-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.canvas-wrap {
    padding: 4px;
    background: linear-gradient(135deg, var(--canvas-border), rgba(110, 207, 138, 0.08));
    border-radius: calc(var(--radius) + 4px);
    box-shadow: var(--shadow), 0 0 40px var(--accent-glow);
}

#lawn {
    display: block;
    border-radius: var(--radius);
    background: #1a3d1a;
}

.total-mowed {
    margin: 0;
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    width: 100%;
    max-width: 500px;
}

.flavor-text {
    margin: 0;
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
    width: 100%;
    max-width: 500px;
    line-height: 1.4;
}

.footer {
    display: flex;
    justify-content: center;
    padding: 1rem 1.5rem 1.5rem;
    max-width: 1680px;
    margin: 0 auto;
}

.btn {
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-sm);
    transition: background 0.15s, transform 0.1s, box-shadow 0.15s, opacity 0.15s;
}

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

.btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-upgrade {
    padding: 0.55rem 0.85rem;
    text-align: left;
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--panel-border);
}

.btn-upgrade:hover:not(:disabled) {
    background: rgba(110, 207, 138, 0.12);
    border-color: rgba(110, 207, 138, 0.3);
}

.btn-mulch {
    padding: 0.55rem 0.85rem;
    text-align: left;
    color: var(--text);
    background: rgba(201, 162, 39, 0.1);
    border: 1px solid rgba(201, 162, 39, 0.25);
}

.btn-mulch:hover:not(:disabled) {
    background: rgba(201, 162, 39, 0.2);
    box-shadow: 0 0 12px var(--mulch-glow);
}

.btn-nav {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.1rem;
    color: var(--text);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--panel-border);
}

.btn-nav:hover:not(:disabled) {
    background: rgba(110, 207, 138, 0.15);
}

.btn-unlock {
    flex: 1;
    min-width: 200px;
    max-width: 420px;
    padding: 0.65rem 1rem;
    color: var(--text);
    background: rgba(110, 207, 138, 0.15);
    border: 1px solid rgba(110, 207, 138, 0.35);
}

.btn-unlock:hover:not(:disabled) {
    background: rgba(110, 207, 138, 0.25);
    box-shadow: 0 0 16px var(--accent-glow);
}

.btn-prestige {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: #0f1a14;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-prestige:hover:not(:disabled) {
    box-shadow: 0 6px 28px var(--accent-glow);
}

.btn-prestige:disabled {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    box-shadow: none;
}

@media (max-width: 1200px) {
    .game-layout {
        grid-template-columns: 1fr 1fr;
    }

    .panel-stages {
        order: 1;
        grid-column: 1 / -1;
        width: 100%;
        min-height: 0;
    }

    .stage-menu {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.5rem;
        overflow: hidden;
    }

    .canvas-section {
        order: 2;
        grid-column: 1 / -1;
    }

    .panel-upgrades {
        order: 3;
    }

    .panel-mulch {
        order: 4;
    }
}

@media (max-width: 768px) {
    .stage-menu {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 1024px) {
    .game-layout {
        grid-template-columns: 1fr;
    }

    .panel-stages {
        grid-column: auto;
    }

    .canvas-section {
        grid-column: auto;
    }
}

@media (max-width: 520px) {
    .header {
        padding: 0.75rem 1rem;
    }

    .game-layout {
        padding: 1rem;
    }

    #lawn {
        max-width: 100%;
        height: auto;
    }
}