:root {
    --bg-dark: #090d18;
    --card-bg: #111728;
    --card-bg-alt: #161f36;
    --input-bg: #1c2744;
    --input-border: #28395f;
    --accent-blue: #00e5ff;
    --accent-gold: #ffb703;
    --accent-green: #00f090;
    --accent-red: #ff4d6d;
    --accent-purple: #a78bfa;
    --accent-orange: #fb8500;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #23314f;
    --code-bg: #0b1120;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: linear-gradient(135deg, #0d152c 0%, #172346 100%);
    padding: 1rem 1.8rem;
    border-bottom: 2px solid var(--accent-blue);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.5);
}

.header-title {
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-title h1 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: #ffffff;
}

.header-title p {
    font-size: 0.82rem;
    color: var(--accent-gold);
    margin-top: 2px;
}

.version-badge {
    background: linear-gradient(90deg, #ff8c00, #ff0055);
    color: white;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    margin-left: 8px;
    vertical-align: middle;
    letter-spacing: 0.5px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-header {
    background: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--input-border);
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.25s ease;
}

.btn-header:hover {
    background: var(--accent-blue);
    color: #050a15;
    border-color: var(--accent-blue);
    transform: translateY(-1px);
}

/* Main Layout */
.main-container {
    display: grid;
    grid-template-columns: 460px 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    max-width: 1750px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}

@media (max-width: 1200px) {
    .main-container {
        grid-template-columns: 1fr;
    }
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 1.4rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    margin-bottom: 1.4rem;
}

.card:last-child {
    margin-bottom: 0;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.1rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title-group {
    display: flex;
    align-items: center;
    gap: 9px;
}

.card-title-group h2 {
    font-size: 1.1rem;
    color: var(--accent-gold);
    font-weight: 600;
}

/* Hierarchy Step Banners */
.step-banner {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 229, 255, 0.08);
    border-left: 3px solid var(--accent-blue);
    padding: 8px 12px;
    border-radius: 0 6px 6px 0;
    margin-bottom: 1rem;
    font-size: 0.82rem;
    color: var(--accent-blue);
    font-weight: 600;
}

.step-banner.secondary {
    background: rgba(255, 183, 3, 0.08);
    border-left-color: var(--accent-gold);
    color: var(--accent-gold);
}

/* Input Styles */
.input-group {
    margin-bottom: 0.95rem;
}

.input-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.86rem;
    color: var(--text-main);
    margin-bottom: 5px;
    font-weight: 500;
}

.unit-badge {
    color: var(--accent-blue);
    font-size: 0.78rem;
    font-weight: 600;
}

.input-control {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    color: #fff;
    padding: 9px 12px;
    border-radius: 8px;
    font-size: 0.92rem;
    font-weight: 600;
    outline: none;
    transition: all 0.25s ease;
}

.input-control:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.3);
    background: #202d4f;
}

/* Button Tabs / Segmented Controls */
.tab-segmented {
    display: flex;
    gap: 4px;
    background: var(--input-bg);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    margin-bottom: 1rem;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.tab-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    background: var(--accent-blue);
    color: #060b17;
    box-shadow: 0 2px 8px rgba(0, 229, 255, 0.4);
}

.tab-btn.gold.active {
    background: var(--accent-gold);
    color: #060b17;
    box-shadow: 0 2px 8px rgba(255, 183, 3, 0.4);
}

/* Radio button row */
.radio-pill-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 1rem;
}

.radio-pill {
    position: relative;
}

.radio-pill input {
    display: none;
}

.radio-pill label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 9px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.25s ease;
}

.radio-pill input:checked + label {
    background: rgba(0, 229, 255, 0.15);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
}

/* Multi-Step Table */
.step-table-container {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    padding: 10px;
    margin-bottom: 1rem;
}

.step-row {
    display: grid;
    grid-template-columns: 28px 1fr 1fr 34px;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.step-row-header {
    font-size: 0.76rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 6px;
}

.btn-icon-del {
    background: rgba(255, 77, 109, 0.2);
    color: var(--accent-red);
    border: 1px solid rgba(255, 77, 109, 0.4);
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-icon-del:hover {
    background: var(--accent-red);
    color: #fff;
}

.add-step-btn {
    width: 100%;
    background: rgba(0, 229, 255, 0.08);
    border: 1px dashed var(--accent-blue);
    color: var(--accent-blue);
    padding: 9px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.86rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all 0.25s ease;
    margin-top: 6px;
}

.add-step-btn:hover {
    background: var(--accent-blue);
    color: #060b17;
}

/* G71 Header Interactive Card */
.g71-interactive-box {
    background: #0d1324;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 1rem;
}

.g71-code-row {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 4px;
    margin-bottom: 8px;
    font-family: 'Fira Code', monospace;
    font-size: 0.83rem;
    overflow-x: auto;
}

.g71-code-row:last-child {
    margin-bottom: 0;
}

.gcode-tag {
    color: #38bdf8;
    font-weight: 600;
    white-space: nowrap;
}

.gcode-tag.gold {
    color: var(--accent-gold);
}

.gcode-tag.green {
    color: var(--accent-green);
}

.g71-input {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    color: #fff;
    padding: 3px 4px;
    border-radius: 4px;
    font-family: 'Fira Code', monospace;
    font-size: 0.83rem;
    font-weight: 600;
    width: 56px;
    text-align: center;
    outline: none;
    flex-shrink: 0;
}

.g71-input:focus {
    border-color: var(--accent-gold);
    box-shadow: 0 0 6px rgba(255, 183, 3, 0.4);
}

/* Checkbox */
.checkbox-card {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 9px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.86rem;
    color: var(--accent-gold);
    margin-bottom: 1rem;
}

.checkbox-card input {
    accent-color: var(--accent-gold);
    width: 17px;
    height: 17px;
}

/* Action Button */
.calc-btn {
    width: 100%;
    background: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);
    color: #ffffff;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(0, 114, 255, 0.4);
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 198, 255, 0.6);
}

/* Right Content Area */
.content-area {
    display: flex;
    flex-direction: column;
    gap: 1.4rem;
}

/* Canvas Card */
.canvas-card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 1.2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.canvas-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.canvas-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
}

.canvas-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-ctrl {
    background: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--input-border);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.2s ease;
}

.btn-ctrl:hover {
    background: var(--border-color);
    color: var(--accent-blue);
}

.btn-ctrl.primary {
    background: var(--accent-blue);
    color: #060b17;
    border-color: var(--accent-blue);
}

.btn-ctrl.primary:hover {
    background: #4df0ff;
}

#canvasContainer {
    width: 100%;
    height: 380px;
    background: #060a14;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

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

/* Legend */
.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
    font-size: 0.78rem;
    color: var(--text-muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-color {
    width: 14px;
    height: 4px;
    border-radius: 2px;
}

.bg-raw { background: #475569; }
.bg-drill { background: #38bdf8; }
.bg-face { background: #eab308; }
.bg-finished { background: #00e5ff; height: 3px; }
.bg-cut { background: #00f090; }
.bg-rapid { background: #ff4d6d; }

/* Metrics Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.metric-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.1rem;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-blue);
}

.metric-card.gold::before {
    background: var(--accent-gold);
}

.metric-card.green::before {
    background: var(--accent-green);
}

.metric-card.purple::before {
    background: var(--accent-purple);
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 6px;
}

.metric-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #ffffff;
    font-family: 'Fira Code', monospace;
}

.metric-subtext {
    font-size: 0.76rem;
    color: var(--accent-blue);
    margin-top: 4px;
    font-weight: 500;
}

.metric-card.gold .metric-subtext {
    color: var(--accent-gold);
}

/* G-Code Output Section */
.gcode-output-card {
    background: var(--card-bg);
    border-radius: 14px;
    padding: 1.2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.gcode-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}

.gcode-toolbar-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--accent-green);
}

.gcode-btn-group {
    display: flex;
    gap: 8px;
}

.gcode-editor-box {
    background: var(--code-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.gcode-textarea {
    width: 100%;
    min-height: 220px;
    background: transparent;
    color: #38bdf8;
    border: none;
    padding: 12px;
    font-family: 'Fira Code', monospace;
    font-size: 0.86rem;
    line-height: 1.5;
    outline: none;
    resize: vertical;
    white-space: pre;
}

/* Notification Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--accent-green);
    color: #060b17;
    padding: 10px 18px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(0, 240, 144, 0.4);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 9999;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}