:root {
    --bg: #faf7f2;
    --bg-canvas: #fffcf7;
    --bg-bar: #ffffff;
    --bg-btn: #ffffff;
    --bg-btn-h: #fef3c7;
    --bg-icon-btn: #ffffff;
    --dot: rgba(0, 0, 0, 0.04);
    --border: #d6d3d1;
    --border-btn: #a8a29e;
    --shadow: rgba(0, 0, 0, 0.15);
    --text: #1c1917;
    --text-sub: #78716c;
    --text-btn: #44403c;
    --text-btn-h: #92400e;
    --pill-bg: #ffffff;
    --sel-bg: rgba(255, 255, 255, 0.9);
    --toast-bg: rgba(20, 20, 20, 0.85);
    --toast-color: #ffffff;
    --kbd-bg: #ffffff;
    --kbd-border: #d6d3d1;
    --highlight: #1c1917;
}

[data-theme="dark"] {
    --bg: #1c1917;
    --bg-canvas: #292524;
    --bg-bar: #292524;
    --bg-btn: #44403c;
    --bg-btn-h: #78350f;
    --bg-icon-btn: #44403c;
    --dot: rgba(255, 255, 255, 0.05);
    --border: #57534e;
    --border-btn: #78716c;
    --shadow: rgba(0, 0, 0, 0.5);
    --text: #f5f5f4;
    --text-sub: #a8a29e;
    --text-btn: #f5f5f4;
    --text-btn-h: #fde68a;
    --pill-bg: #44403c;
    --sel-bg: rgba(41, 37, 36, 0.95);
    --toast-bg: rgba(245, 245, 244, 0.95);
    --toast-color: #1c1917;
    --kbd-bg: #44403c;
    --kbd-border: #78716c;
    --highlight: #ffffff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

html,
body {
    width: 100%;
    min-height: 100%;
}

body {
    font-family: 'Nunito', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 0;
    height: 100%;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    flex-shrink: 0;
    gap: 12px;
}

.logo-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: #ff6b6b;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

h1 {
    font-size: 26px;
    font-weight: 900;
    letter-spacing: 0.5px;
    line-height: 1;
}

.subtitle {
    font-size: 11px;
    font-weight: 800;
    color: var(--text-sub);
    letter-spacing: 1.5px;
    margin-top: 4px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.hint-pill {
    background: var(--pill-bg);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 800;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px var(--shadow);
    border: 1px solid var(--border);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.hint-pill:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
    color: #0ea5e9;
    border-color: #0ea5e9;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-btn);
    background: var(--bg-icon-btn);
    color: var(--text-btn);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 6px var(--shadow);
}

.icon-btn:hover {
    background: var(--bg-btn-h);
    color: var(--text-btn-h);
    border-color: var(--text-btn-h);
    transform: scale(1.05);
}

#canvas-wrap {
    flex: 1 1 auto;
    min-height: 220px;
    position: relative;
    margin: 0 20px;
    background-color: var(--bg-canvas);
    background-image: radial-gradient(var(--dot) 2px, transparent 2px);
    background-size: 30px 30px;
    border-radius: 24px;
    box-shadow: inset 0 0 0 1px var(--border), 0 10px 30px var(--shadow);
    overflow: hidden;
    touch-action: none;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    outline: none;
}

#sel-label {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--sel-bg);
    backdrop-filter: blur(8px);
    padding: 8px 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 800;
    color: var(--text);
    box-shadow: 0 4px 12px var(--shadow);
    display: none;
    align-items: center;
    gap: 8px;
    pointer-events: none;
    border: 1px solid var(--border);
}

#sel-color-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

#kbd-hints {
    position: absolute;
    bottom: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
    opacity: 0.8;
}

.kbd-row {
    font-size: 13px;
    font-weight: 800;
    color: var(--text-sub);
    display: flex;
    align-items: center;
    gap: 6px;
}

kbd {
    background: var(--kbd-bg);
    border: 1px solid var(--kbd-border);
    border-radius: 6px;
    padding: 2px 8px;
    font-family: 'Nunito', sans-serif;
    color: var(--text);
    box-shadow: 0 2px 0 var(--kbd-border);
}

#snap-toast {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    background: var(--toast-bg);
    color: var(--toast-color);
    padding: 14px 28px;
    border-radius: 30px;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

#snap-toast.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

#toolbar {
    display: flex;
    gap: 12px;
    padding: 16px 20px calc(24px + env(safe-area-inset-bottom, 0px)) 20px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    flex-shrink: 0;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 14px;
    border: 2px solid var(--border-btn);
    background: var(--bg-btn);
    color: var(--text-btn);
    font-family: 'Nunito', sans-serif;
    font-size: 15px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 6px var(--shadow);
    white-space: nowrap;
}

.tool-btn i {
    font-size: 18px;
}

.tool-btn:hover {
    background: var(--bg-btn-h);
    color: var(--text-btn-h);
    border-color: var(--text-btn-h);
    transform: translateY(-2px);
    box-shadow: 0 6px 14px var(--shadow);
}

.divider {
    width: 2px;
    height: 36px;
    background: var(--border);
    margin: 0 4px;
    border-radius: 2px;
}

.save-btn {
    background: #eff6ff;
    color: #1e40af;
    border-color: #bfdbfe;
}

.save-btn:hover {
    background: #dbeafe !important;
    color: #1e3a8a !important;
    border-color: #3b82f6 !important;
}

[data-theme="dark"] .save-btn {
    background: #1e3a8a;
    color: #dbeafe;
    border-color: #1e40af;
}

[data-theme="dark"] .save-btn:hover {
    background: #1d4ed8 !important;
    border-color: #60a5fa !important;
}

.reset-btn {
    background: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

.reset-btn:hover {
    background: #fee2e2 !important;
    color: #7f1d1d !important;
    border-color: #ef4444 !important;
}

[data-theme="dark"] .reset-btn {
    background: #7f1d1d;
    color: #fecaca;
    border-color: #991b1b;
}

[data-theme="dark"] .reset-btn:hover {
    background: #991b1b !important;
    border-color: #f87171 !important;
}

@media (max-width: 1024px) {
    body {
        overflow-y: auto;
    }

    #app {
        min-height: 100vh;
        min-height: 100dvh;
    }

    #canvas-wrap {
        margin: 0 12px;
    }

    #toolbar {
        position: sticky;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--bg);`r`n        background: color-mix(in oklab, var(--bg) 88%, transparent);
        backdrop-filter: blur(8px);
        z-index: 5;
    }
}

@media (max-width: 760px) {
    header {
        padding: 10px 12px;
    }

    .hint-pill,
    #kbd-hints {
        display: none;
    }

    h1 {
        font-size: 22px;
    }

    .subtitle {
        letter-spacing: 1px;
    }

    #toolbar {
        padding: 10px 12px calc(12px + env(safe-area-inset-bottom, 0px)) 12px;
        gap: 8px;
    }

    .tool-btn span {
        display: none;
    }

    .tool-btn {
        padding: 12px;
        border-radius: 12px;
    }

    .tool-btn i {
        font-size: 20px;
        margin: 0;
    }

    .divider {
        display: none;
    }
}

@media (max-height: 700px) {
    #canvas-wrap {
        min-height: 180px;
    }

    #toolbar {
        padding-top: 10px;
    }

    .tool-btn {
        padding: 8px 12px;
    }
}