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

:root {
    --green: #7ecb35;
    --dark-bg: #0f1923;
    --panel-bg: rgba(0, 0, 0, 0.55);
    --border: rgba(126, 203, 53, 0.3);
}

body {
    background: var(--dark-bg);
    font-family: 'Segoe UI', Tahoma, sans-serif;
    color: #fff;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    user-select: none;
}

/* ── HEADER ───────────────────────────────────── */
header {
    background: var(--panel-bg);
    border-bottom: 2px solid var(--border);
    padding: 8px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
    backdrop-filter: blur(8px);
}

h1 {
    font-size: 1.4rem;
    color: var(--green);
    letter-spacing: 1px;
    text-shadow: 0 0 12px rgba(126, 203, 53, 0.6);
}

.inventory {
    display: flex;
    gap: 12px;
    margin-left: auto;
}

.inv-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.inv-icon { font-size: 1.1rem; }
.inv-item strong { color: var(--green); }

/* ── LAYOUT ───────────────────────────────────── */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ── TOOLBAR ──────────────────────────────────── */
.toolbar {
    width: 110px;
    background: var(--panel-bg);
    border-right: 2px solid var(--border);
    padding: 14px 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
    backdrop-filter: blur(8px);
}

.toolbar-label {
    font-size: 0.6rem;
    text-transform: uppercase;
    color: #666;
    text-align: center;
    letter-spacing: 2px;
    margin-bottom: 4px;
}

.tool-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 2px solid #333;
    border-radius: 10px;
    padding: 10px 6px 8px;
    cursor: pointer;
    text-align: center;
    color: #ccc;
    font-size: 0.72rem;
    transition: all 0.15s;
    line-height: 1.3;
}

.tool-btn:hover {
    background: rgba(126, 203, 53, 0.1);
    border-color: var(--green);
    color: #fff;
    transform: translateY(-1px);
}

.tool-btn.active {
    background: rgba(126, 203, 53, 0.18);
    border-color: var(--green);
    color: #fff;
    box-shadow: 0 0 12px rgba(126, 203, 53, 0.25);
}

.tool-icon {
    font-size: 1.9rem;
    display: block;
    margin-bottom: 4px;
}

.guide {
    margin-top: auto;
    border-top: 1px solid #333;
    padding-top: 10px;
    font-size: 0.65rem;
    color: #666;
    text-align: center;
    line-height: 1.8;
}

.grow-info {
    font-size: 0.62rem;
    color: #4fc3f7;
    margin-top: 6px;
    background: rgba(79, 195, 247, 0.08);
    border: 1px solid rgba(79, 195, 247, 0.2);
    border-radius: 6px;
    padding: 4px;
}

/* ── SHOP PANEL ───────────────────────────────── */
.shop-panel {
    margin-top: 10px;
    border-top: 1px solid #333;
    padding-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.shop-title {
    font-size: 0.6rem;
    text-transform: uppercase;
    color: #888;
    text-align: center;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.shop-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 2px solid #444;
    border-radius: 8px;
    padding: 6px 4px;
    cursor: pointer;
    text-align: center;
    color: #ccc;
    font-size: 0.68rem;
    line-height: 1.4;
    transition: all 0.15s;
    width: 100%;
}

.shop-btn small {
    color: #f0c040;
    font-size: 0.62rem;
}

.sell-btn:hover {
    background: rgba(46, 204, 113, 0.15);
    border-color: #2ecc71;
    color: #fff;
}

.buy-btn:hover {
    background: rgba(241, 196, 15, 0.15);
    border-color: #f1c40f;
    color: #fff;
}

/* ── CANVAS AREA ──────────────────────────────── */
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#gameCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

#gameCanvas canvas {
    display: block;
    cursor: crosshair;
}

/* ── TOAST MESSAGE ────────────────────────────── */
#message {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 22px;
    border-radius: 22px;
    font-size: 0.88rem;
    font-weight: 500;
    display: none;
    z-index: 1000;
    pointer-events: none;
    animation: fadeIn 0.2s ease;
    white-space: nowrap;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(-50%) translateY(6px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

#message.error {
    background: rgba(192, 57, 43, 0.92);
    border: 1px solid #e74c3c;
    box-shadow: 0 4px 20px rgba(192, 57, 43, 0.4);
}

#message.success {
    background: rgba(39, 174, 96, 0.92);
    border: 1px solid #2ecc71;
    box-shadow: 0 4px 20px rgba(39, 174, 96, 0.4);
}

#message.info {
    background: rgba(41, 128, 185, 0.92);
    border: 1px solid #3498db;
    box-shadow: 0 4px 20px rgba(41, 128, 185, 0.4);
}