/* --- Reset --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --bg-0: #0a0a0c;
    --bg-1: #101014;
    --bg-2: #18181e;
    --bg-3: #222230;
    --border: #2a2a34;
    --border-hover: #3a3a48;
    --text-1: #e8e8f0;
    --text-2: #9898a8;
    --text-3: #606070;
    --accent: #ff6b4a;
    --accent-dim: #2a1810;
    --accent-hover: #ff8a6a;
    --danger: #ff4455;
    --success: #44cc88;
    --radius: 10px;
    --radius-sm: 7px;
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    --tr: 0.18s ease;
    --panel-w: 360px;
}

body, html {
    height: 100dvh;
    background: var(--bg-0);
    color: var(--text-1);
    font-family: var(--font-sans);
    font-size: 13px;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

#app { height: 100dvh; display: flex; flex-direction: column; overflow: hidden; }

#canvas-area {
    flex: 0 0 35dvh; min-height: 150px; max-height: 45dvh;
    background: var(--bg-0); display: flex; align-items: center; justify-content: center;
    position: relative; overflow: hidden;
}

#canvas-container { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; overflow: hidden; }
#canvas-container canvas { display: block; border-radius: 2px; }

#canvas-area.drag-over { outline: 2px dashed var(--accent); outline-offset: -4px; background: rgba(255,107,74,0.04); }

.export-info { font-family: var(--font-mono); font-size: 11px; color: var(--text-2); padding: 6px 0; }

#canvas-info {
    position: absolute; bottom: 8px; left: 50%; transform: translateX(-50%);
    font-family: var(--font-mono); font-size: 10px; color: var(--text-3);
    background: rgba(0,0,0,0.6); backdrop-filter: blur(6px);
    padding: 4px 12px; border-radius: 12px; pointer-events: none; white-space: nowrap;
}

#controls {
    flex: 1 1 0; min-height: 0; overflow: hidden; background: var(--bg-1);
    display: flex; flex-direction: column; border-top: 1px solid var(--border); z-index: 100;
}

.scroll-container {
    flex: 1 1 0; min-height: 0; overflow-y: auto; overflow-x: hidden;
    padding: 14px; display: flex; flex-direction: column; gap: 6px;
    scrollbar-width: thin; scrollbar-color: var(--bg-3) transparent;
    -webkit-overflow-scrolling: touch;
}
.scroll-container::-webkit-scrollbar { width: 4px; }
.scroll-container::-webkit-scrollbar-track { background: transparent; }
.scroll-container::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 2px; }

.quick-actions { display: flex; gap: 6px; flex-shrink: 0; }

.section-collapsible { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); flex-shrink: 0; }
.section-collapsible[open] { border-color: var(--border-hover); }

.section-toggle { display: flex; align-items: center; padding: 9px 12px; cursor: pointer; user-select: none; list-style: none; gap: 8px; }
.section-toggle::-webkit-details-marker { display: none; }
.section-toggle::marker { content: ''; }
.section-toggle h2 { font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: 1.5px; color: var(--text-2); flex: 1; }
.section-toggle::before { content: '\25B8'; font-size: 9px; color: var(--text-3); transition: transform var(--tr); flex-shrink: 0; }
.section-collapsible[open] > .section-toggle::before { transform: rotate(90deg); }

.section-body { padding: 0 12px 10px; display: flex; flex-direction: column; gap: 7px; }

.field { display: flex; flex-direction: column; gap: 4px; flex: 1; min-width: 0; }
.field label { font-family: var(--font-mono); font-size: 9px; color: var(--text-3); font-weight: 700; letter-spacing: 0.5px; display: flex; align-items: center; gap: 5px; }
.field label .val { color: var(--accent); font-weight: 400; }

.row-2 { display: flex; gap: 8px; align-items: flex-end; }
.row-3 { display: flex; gap: 8px; align-items: flex-end; }

input[type="text"], input[type="number"], textarea, select {
    background: var(--bg-0); border: 1px solid var(--border); color: var(--text-1);
    padding: 8px 10px; border-radius: var(--radius-sm); font-size: 12px;
    font-family: var(--font-sans); width: 100%; min-width: 0; outline: none;
    transition: border-color var(--tr);
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }

select {
    cursor: pointer; -webkit-appearance: none; appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2360607a' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 10px center; padding-right: 28px;
}
textarea { resize: vertical; min-height: 40px; line-height: 1.4; }

input[type="range"] { width: 100%; height: 24px; background: transparent; outline: none; -webkit-appearance: none; padding: 0; }
input[type="range"]::-webkit-slider-runnable-track { height: 3px; background: var(--bg-3); border-radius: 2px; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; background: var(--text-1); border-radius: 50%; cursor: pointer; margin-top: -5.5px; box-shadow: 0 1px 3px rgba(0,0,0,0.3); }
input[type="range"]::-moz-range-track { height: 3px; background: var(--bg-3); border-radius: 2px; border: none; }
input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; background: var(--text-1); border-radius: 50%; cursor: pointer; border: none; }

.toggle-group { display: flex; gap: 4px; }
.toggle-btn {
    flex: 1; padding: 7px 4px; font-family: var(--font-mono); font-size: 9px; font-weight: 700;
    letter-spacing: 0.3px; background: var(--bg-0); border: 1px solid var(--border);
    color: var(--text-3); border-radius: var(--radius-sm); cursor: pointer;
    transition: all var(--tr); text-align: center;
}
.toggle-btn:hover { border-color: var(--border-hover); color: var(--text-2); }
.toggle-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); box-shadow: 0 0 8px rgba(255,107,74,0.3); }

input[type="color"] { height: 32px; padding: 3px; background: var(--bg-0); border: 1px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; width: 100%; }
input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 3px; }

.btn-action {
    flex: 1; background: var(--bg-3); border: 1px solid var(--border); color: var(--text-1);
    padding: 10px 8px; text-align: center; border-radius: var(--radius-sm);
    font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: 0.3px;
    cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 5px;
    transition: all var(--tr);
}
.btn-action:hover { background: var(--border-hover); }
.btn-action:active { transform: scale(0.98); }
.btn-action.primary { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 800; font-size: 11px; }
.btn-action.primary:hover { background: var(--accent-hover); }

.btn-sm { flex: 0 0 50px; background: var(--bg-3); border: 1px solid var(--border); color: var(--text-1); padding: 8px 6px; text-align: center; border-radius: var(--radius-sm); font-family: var(--font-mono); font-size: 10px; font-weight: 700; cursor: pointer; transition: all var(--tr); }
.btn-sm:hover { border-color: var(--border-hover); }

.upload-btn { text-decoration: none; }
input[type="file"] { display: none; }

.tool-nav-link { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius); text-decoration: none; color: var(--text-1); transition: all var(--tr); flex-shrink: 0; }
.tool-nav-link:hover { border-color: var(--accent); background: var(--accent-dim); }
.tool-nav-icon { font-size: 18px; flex-shrink: 0; }
.tool-nav-text { flex: 1; font-family: var(--font-mono); font-size: 10px; color: var(--text-2); line-height: 1.4; }
.tool-nav-text strong { color: var(--text-1); font-weight: 700; }
.tool-nav-arrow { font-family: var(--font-mono); font-size: 14px; color: var(--text-3); flex-shrink: 0; }

.status-msg { font-family: var(--font-mono); font-size: 9px; color: var(--text-3); text-align: center; padding: 6px 0; letter-spacing: 0.3px; flex-shrink: 0; }
.status-msg.success { color: var(--success); }
.status-msg.error { color: var(--danger); }
.safe-bottom { height: env(safe-area-inset-bottom); min-height: 8px; flex-shrink: 0; }

@media (min-width: 768px) {
    #app { flex-direction: row; }
    #controls { order: -1; width: var(--panel-w); min-width: var(--panel-w); height: 100dvh; max-height: 100dvh; border-top: none; border-right: 1px solid var(--border); }
    #canvas-area { flex: 1; height: 100dvh; max-height: 100dvh; min-height: unset; background-image: radial-gradient(circle at 50% 50%, rgba(255,107,74,0.02) 0%, transparent 60%); }
    #canvas-container canvas { box-shadow: 0 4px 30px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.04); border-radius: 3px; }
    .scroll-container { padding: 16px; }
}

@media (max-width: 767px) {
    #canvas-area { flex: 0 0 30dvh; min-height: 120px; max-height: 35dvh; }
    #controls { flex: 1 1 0; min-height: 0; }
    .scroll-container { padding: 10px; gap: 4px; }
    .field label { font-size: 8px; }
    input[type="text"], input[type="number"], textarea, select { padding: 7px 8px; font-size: 16px; }
    textarea { min-height: 34px; }
    .toggle-btn { padding: 6px 3px; font-size: 8px; }
    .toggle-group { gap: 3px; }
    .btn-action { padding: 8px 6px; font-size: 9px; }
    .btn-action.primary { font-size: 10px; }
    .btn-sm { padding: 7px 5px; font-size: 9px; flex: 0 0 44px; }
    .row-2, .row-3 { gap: 6px; }
    input[type="range"] { height: 22px; }
    input[type="range"]::-webkit-slider-thumb { width: 12px; height: 12px; margin-top: -4.5px; }
    input[type="range"]::-moz-range-thumb { width: 12px; height: 12px; }
    input[type="color"] { height: 28px; }
    .status-msg { font-size: 8px; padding: 4px 0; }
    #canvas-info { font-size: 8px; padding: 3px 8px; bottom: 4px; }
}

:root.light, :root[data-theme="light"] {
    --bg-0: #f4f4f6; --bg-1: #eaeaee; --bg-2: #ffffff; --bg-3: #dddde4;
    --border: #ccccd4; --border-hover: #aaabb4; --text-1: #1a1a20; --text-2: #55555e;
    --text-3: #888890; --accent: #e04a2a; --accent-dim: #fce8e4; --accent-hover: #c83a1a;
    --danger: #dd3344; --success: #22aa66;
}
:root.light body, :root[data-theme="light"] body { background: var(--bg-0); }
:root.light #canvas-area, :root[data-theme="light"] #canvas-area { background: #e6e6ec; }
:root.light .toggle-btn.active, :root[data-theme="light"] .toggle-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
:root.light .btn-action.primary, :root[data-theme="light"] .btn-action.primary { background: var(--accent); color: #fff; }

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-0: #f4f4f6; --bg-1: #eaeaee; --bg-2: #ffffff; --bg-3: #dddde4;
        --border: #ccccd4; --border-hover: #aaabb4; --text-1: #1a1a20; --text-2: #55555e;
        --text-3: #888890; --accent: #e04a2a; --accent-dim: #fce8e4; --accent-hover: #c83a1a;
        --danger: #dd3344; --success: #22aa66;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}