/* ══════════════════════════════════════════════════
   DXF 图纸查看器 · 冷峻工业风
   ══════════════════════════════════════════════════ */

/* ── Design Tokens ──────────────────────── */
:root {
    --bg-deepest: #0d0d0d;
    --bg-panel: #1a1a1a;
    --bg-card: #242424;
    --bg-hover: #2d2d2d;
    --accent: #00b4d8;
    --accent-dim: rgba(0, 180, 216, 0.12);
    --accent-border: rgba(0, 180, 216, 0.3);
    --accent-glow: rgba(0, 180, 216, 0.08);
    --danger: #ff6b35;
    --success: #38b000;
    --warning: #ffd60a;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --text-disabled: #707070;
    --border-default: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.15);
    --font-mono: "DM Mono", "Cascadia Code", "JetBrains Mono", monospace;
    --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    --radius-sm: 2px;
    --radius-md: 4px;
    --ease-industrial: cubic-bezier(0.25, 0.1, 0.25, 1);
    --duration-micro: 120ms;
    --duration-transition: 200ms;
    --duration-enter: 300ms;
}

/* ── Reset ──────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-sans);
    background: var(--bg-deepest);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ── App Shell ──────────────────────────── */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ── Toolbar ────────────────────────────── */
#toolbar {
    background: var(--bg-panel);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-strong);
    flex-shrink: 0;
    font-size: 13px;
    user-select: none;
}

#toolbar h1 {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    white-space: nowrap;
    letter-spacing: 0.5px;
}

#toolbar h1::before { content: "▸ "; }

.toolbar-sep {
    width: 1px;
    height: 20px;
    background: var(--border-default);
    flex-shrink: 0;
}

/* ── Buttons ────────────────────────────── */
button {
    font-family: var(--font-sans);
    font-size: 13px;
    cursor: pointer;
    transition: background var(--duration-micro) var(--ease-industrial),
                border-color var(--duration-micro) var(--ease-industrial),
                opacity var(--duration-micro) var(--ease-industrial);
}

button:active { transform: scale(0.97); }

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-strong);
    padding: 5px 14px;
    border-radius: var(--radius-sm);
}
.btn-secondary:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--text-disabled); }
.btn-secondary:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

.btn-icon {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--border-default);
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    line-height: 1;
}
.btn-icon:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--accent); }
.btn-icon:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

/* ── File Nav ───────────────────────────── */
#file-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
}

#file-counter {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-secondary);
    min-width: 50px;
    text-align: center;
}

#file-name {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-secondary);
    padding: 4px 8px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#file-selector {
    padding: 5px 10px;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-family: var(--font-mono);
    min-width: 180px;
    outline: none;
}
#file-selector:focus { border-color: var(--accent-border); }

/* ── Viewer Area ────────────────────────── */
#viewer {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--bg-deepest);
}

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

#viewer-help {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    pointer-events: none;
    background: rgba(0, 0, 0, 0.55);
    padding: 5px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--accent-border);
    letter-spacing: 0.5px;
    white-space: nowrap;
    opacity: 0.7;
}

/* ── Layer Panel ────────────────────────── */
#layer-dropdown { position: relative; }

#layer-toggle {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
    padding: 5px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: border-color var(--duration-micro) var(--ease-industrial);
}
#layer-toggle:hover { border-color: var(--accent); }
#layer-toggle .arrow {
    display: inline-block;
    transition: transform var(--duration-transition) var(--ease-industrial);
    font-size: 10px;
    margin-left: 4px;
}
#layer-toggle.open .arrow { transform: rotate(180deg); }

#layer-panel {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: var(--bg-panel);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    display: none;
    z-index: 100;
    min-width: 200px;
    animation: dropdownIn var(--duration-enter) var(--ease-industrial);
}
#layer-panel.visible { display: block; }
#layer-list { display: flex; flex-wrap: wrap; gap: 4px; }
#layer-list label {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 11px;
    color: var(--text-secondary);
    border: 1px solid transparent;
    transition: border-color var(--duration-micro) var(--ease-industrial);
}
#layer-list label:hover { border-color: var(--border-strong); }
#layer-list input[type="checkbox"] { margin: 0; accent-color: var(--accent); }
.layer-color-chip { display: inline-block; width: 8px; height: 8px; border-radius: 1px; }

/* ── Toast Notifications ────────────────── */
#toast-container {
    position: fixed;
    top: 50px;
    right: 16px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-size: 13px;
    font-family: var(--font-sans);
    pointer-events: auto;
    transform: translateX(120%);
    transition: transform var(--duration-enter) var(--ease-industrial),
                opacity var(--duration-enter) var(--ease-industrial);
    opacity: 0;
    min-width: 280px;
    max-width: 420px;
}

.toast-enter { transform: translateX(0); opacity: 1; }
.toast-exit { transform: translateX(120%); opacity: 0; }

.toast-success { background: #0d1a0d; border-left: 3px solid var(--success); }
.toast-error { background: #1a0d0d; border-left: 3px solid var(--danger); }
.toast-warning { background: #1a1a0d; border-left: 3px solid var(--warning); }
.toast-info { background: #0d111a; border-left: 3px solid var(--accent); }

.toast-icon { font-size: 14px; flex-shrink: 0; }
.toast-success .toast-icon { color: var(--success); }
.toast-error .toast-icon { color: var(--danger); }
.toast-warning .toast-icon { color: var(--warning); }
.toast-info .toast-icon { color: var(--accent); }

.toast-msg { flex: 1; color: var(--text-secondary); font-size: 12px; }

.toast-action {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
    padding: 2px 12px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    cursor: pointer;
    flex-shrink: 0;
}
.toast-action:hover { background: rgba(255, 107, 53, 0.1); }

/* ── Loading State ──────────────────────── */
#loading-overlay {
    position: absolute;
    inset: 0;
    background: var(--bg-deepest);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 50;
}
#loading-overlay.active { display: flex; }

.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.loading-text {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent);
    letter-spacing: 2px;
    animation: loadingPulse 1.8s var(--ease-industrial) infinite;
}

.loading-bar-track {
    width: 120px;
    height: 2px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 1px;
    overflow: hidden;
}

.loading-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 1px;
    animation: loadingBar 1.6s var(--ease-industrial) infinite;
}

/* ── Animations ─────────────────────────── */
@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes loadingPulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

@keyframes loadingBar {
    0% { width: 0; margin-left: 0; }
    30% { width: 40%; margin-left: 0; }
    60% { width: 30%; margin-left: 60%; }
    100% { width: 0; margin-left: 100%; }
}

/* ── Scrollbar ──────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-disabled); }

/* ── Selection ──────────────────────────── */
::selection { background: rgba(0, 180, 216, 0.3); color: var(--text-primary); }