:root {
    --bg-color: #1e1e1e;
    --panel-bg: #2d2d2d;
    --text-color: #eeeeee;
    --text-dim: #aaaaaa;
    --border-color: #3f3f3f;
    --active-color: #333333;
    --hover-color: #444444;
    --accent-color: #4a90e2;
    --header-height: 34px;
    --footer-height: 26px;
    --toolbar-width: 46px;
    --panels-width: 280px;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 13px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ── Menu Bar ─────────────────────────────────────── */
#menu-bar {
    height: var(--header-height);
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    position: relative;
    z-index: 100;
}

#menu-bar-list {
    list-style: none;
    margin: 0;
    padding: 0 4px;
    display: flex;
    height: 100%;
    align-items: center;
    gap: 0;
}

.menu-item {
    padding: 4px 12px;
    cursor: pointer;
    font-size: 12px;
    border-radius: 4px;
    position: relative;
    transition: background 0.1s;
}

.menu-item:hover {
    background-color: var(--hover-color);
}

.menu-dropdown {
    display: none;
    position: fixed;
    background: #333333;
    list-style: none;
    padding: 4px 0;
    border: 1px solid #444;
    min-width: 220px;
    z-index: 10000;
    box-shadow: 0 8px 24px rgba(0,0,0,0.6);
    border-radius: 6px;
}

.menu-dropdown li {
    padding: 6px 16px;
    cursor: pointer;
    font-size: 12px;
    white-space: nowrap;
    color: #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.menu-dropdown li:hover {
    background-color: var(--accent-color);
    color: #fff;
}

.menu-dropdown li.menu-sep {
    padding: 0;
    margin: 4px 8px;
    border-top: 1px solid #555;
    cursor: default;
    pointer-events: none;
}

.menu-dropdown li.menu-sub {
    position: relative;
}

.menu-submenu {
    position: absolute;
    left: 100%;
    top: 0;
}

/* ── Tool Options Bar ────────────────────────────── */
#tool-options {
    height: 28px;
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 12px;
    font-size: 12px;
    color: var(--text-dim);
    gap: 8px;
}

#tool-options input[type="range"] {
    accent-color: var(--accent-color);
    height: 4px;
}

#tool-options input[type="color"] {
    width: 24px;
    height: 20px;
    border: 1px solid var(--border-color);
    background: none;
    padding: 0;
    cursor: pointer;
}

/* ── Main Area ───────────────────────────────────── */
main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ── Toolbar ─────────────────────────────────────── */
#toolbar {
    width: var(--toolbar-width);
    background-color: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 6px;
    gap: 2px;
}

#toolbar button {
    width: 34px;
    height: 34px;
    background: none;
    border: 1px solid transparent;
    color: var(--text-color);
    cursor: pointer;
    border-radius: 6px;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.1s, border 0.1s;
    margin-bottom: 2px;
}

#toolbar button:hover {
    background-color: var(--hover-color);
}

#toolbar button.active {
    background-color: var(--active-color);
    border-color: var(--accent-color);
}

#toolbar button:active {
    background-color: var(--accent-color);
}

#toolbar button svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* ── Canvas ──────────────────────────────────────── */
#canvas-container {
    flex: 1;
    position: relative;
    background-color: #1a1a1a;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-image:
        linear-gradient(45deg, #222 25%, transparent 25%),
        linear-gradient(-45deg, #222 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #222 75%),
        linear-gradient(-45deg, transparent 75%, #222 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

#main-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ── Panels ──────────────────────────────────────── */
#panels {
    width: var(--panels-width);
    background-color: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    min-width: 200px;
    overflow-y: auto;
    overflow-x: hidden;
}

.panel {
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
    flex-shrink: 0;
}

.panel:last-child {
    border-bottom: none;
}

.panel-header {
    margin: 0;
    padding: 8px 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    background-color: #252525;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    transition: color 0.1s;
}

.panel-header:hover {
    background-color: var(--hover-color);
    color: var(--text-color);
}

.panel-content {
    overflow-y: hidden;
    overflow-x: hidden;
}

.panel-content button {
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    cursor: pointer;
}

.panel-content button:hover {
    background: var(--hover-color);
}

/* ── Layer items ─────────────────────────────────── */
.layer-item.selected {
    background: var(--accent-color) !important;
}

/* ── Status Bar ──────────────────────────────────── */
#status-bar {
    height: var(--footer-height);
    background-color: var(--panel-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 12px;
    font-size: 11px;
    color: var(--text-dim);
    justify-content: space-between;
}

/* ── Scrollbar ───────────────────────────────────── */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--panel-bg);
}

::-webkit-scrollbar-thumb {
    background: #555;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #777;
}

/* ── Layer controls ──────────────────────────────── */
#blend-mode-select {
    font-size: 10px;
    padding: 2px 4px;
    border-radius: 3px;
}

/* ── Toolbar swatches ────────────────────────────── */
.swatches {
    margin-top: auto !important;
    padding-bottom: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}