/* ══════════════════════════════════════════════════════════════════
   ThreadGauge Pro — 3-Wire Thread Pitch Calculator Stylesheet
   Machining & Metalworking Domain Design System
   ══════════════════════════════════════════════════════════════════ */

:root {
    --bg-primary: #0b0f19;
    --bg-surface: #131a2a;
    --bg-hover: #1c263d;
    --bg-card-header: #172136;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-cyan: #00f2fe;
    --accent-cyan-glow: rgba(0, 242, 254, 0.15);
    --accent-brass: #f59e0b;
    --accent-brass-glow: rgba(245, 158, 11, 0.15);
    
    --border-color: #253452;
    --border-hover: #3b82f6;
    
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.12);

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-cyan: 0 0 25px rgba(0, 242, 254, 0.2);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --bg-hover: #f1f5f9;
    --bg-card-header: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --accent-cyan: #0284c7;
    --accent-cyan-glow: rgba(2, 132, 199, 0.12);
    --accent-brass: #d97706;
    --accent-brass-glow: rgba(217, 119, 6, 0.12);
    
    --border-color: #cbd5e1;
    --border-hover: #0284c7;
}

/* Base Body Styles */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.app-header {
    text-align: center;
    padding: 2.5rem 1rem 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.header-badge {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent-cyan);
    background: var(--accent-cyan-glow);
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    border: 1px solid rgba(0, 242, 254, 0.3);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.app-header h1 {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    margin: 0 0 0.5rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
}

.app-main {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

/* Mode Selection Bar */
.mode-bar {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.75rem;
    flex-wrap: wrap;
}

.mode-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1.4rem;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.mode-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.mode-btn.active {
    background: var(--accent-cyan-glow);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 15px var(--accent-cyan-glow);
}

/* Main Grid Layout */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
    margin-bottom: 3rem;
}

@media (min-width: 960px) {
    .calculator-grid {
        grid-template-columns: 1.05fr 0.95fr;
    }
}

/* Card Styling */
.controls-card, .results-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1.25rem;
}

.card-header h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0;
}

.card-tag {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-brass);
    background: var(--accent-brass-glow);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
}

.form-section-title {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 1.5rem 0 0.85rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border-color);
}

/* Form Controls */
.form-group {
    margin-bottom: 1rem;
}

.form-row.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 580px) {
    .form-row.grid-2 {
        grid-template-columns: 1fr 1fr;
    }
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.form-input, .form-select {
    width: 100%;
    box-sizing: border-box;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input {
    font-family: var(--font-mono);
}

.form-input:focus, .form-select:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan-glow);
}

.input-with-unit {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-unit input {
    padding-right: 3.2rem;
}

.unit-badge {
    position: absolute;
    right: 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-surface);
    padding: 0.2rem 0.45rem;
    border-radius: 4px;
    pointer-events: none;
}

/* Status Banner */
.status-banner {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
    border: 1px solid var(--success);
    background: var(--success-bg);
    transition: all 0.3s ease;
}

.status-banner.pass {
    border-color: var(--success);
    background: var(--success-bg);
}

.status-banner.warn {
    border-color: var(--warning);
    background: var(--warning-bg);
}

.status-banner.fail {
    border-color: var(--error);
    background: var(--error-bg);
}

.status-icon {
    font-size: 1.6rem;
    font-weight: 800;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
}

.status-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.status-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Metrics Split-Screen Grid */
.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.metric-box {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    text-align: center;
}

.metric-box.primary {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px var(--accent-cyan-glow);
}

.metric-box.accent {
    border-color: var(--accent-brass);
}

.metric-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    letter-spacing: 0.04em;
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.metric-box.accent .metric-value {
    color: var(--accent-brass);
}

.metric-value .unit {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.metric-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* Wire Audit Card */
.wire-audit-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.25rem;
}

.wire-audit-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.wire-audit-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.wire-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.wire-badge.ideal {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success);
}

.wire-badge.warn {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid var(--warning);
}

.wire-badge.error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error);
}

.wire-audit-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 1rem;
    font-size: 0.8rem;
}

.audit-label {
    color: var(--text-muted);
}

.audit-val {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
    float: right;
}

/* Interactive SVG Schematic */
.schematic-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.25rem;
}

.schematic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.schematic-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-cyan);
}

.svg-wrapper {
    width: 100%;
    overflow: hidden;
}

.svg-wrapper svg {
    width: 100%;
    height: auto;
    display: block;
}

.schematic-legend {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border-color);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.color-wire { background: var(--accent-brass); }
.color-pd { background: var(--accent-cyan); }
.color-mow { background: #ec4899; }
.color-anvil { background: #94a3b8; }

/* Technical Summary Table */
.tech-details h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.75rem;
    color: var(--text-secondary);
}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.tech-table td {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.tech-table td:first-child {
    color: var(--text-muted);
}

.tech-table td:last-child {
    text-align: right;
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
}

/* Educational Guide Section */
.educational-guide {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-top: 2rem;
}

.educational-guide h2 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    margin-top: 0;
    color: var(--text-primary);
}

.guide-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

@media (min-width: 768px) {
    .guide-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.guide-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.guide-card.full-width {
    margin-top: 1.5rem;
}

.guide-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    margin-top: 0;
    color: var(--accent-cyan);
}

.formula-box {
    background: var(--bg-surface);
    border-left: 3px solid var(--accent-cyan);
    padding: 0.75rem;
    border-radius: 4px;
    font-size: 0.85rem;
    margin: 0.75rem 0;
}

.formula-box code {
    font-family: var(--font-mono);
    color: var(--accent-brass);
}

.guide-card ul, .guide-card ol {
    padding-left: 1.25rem;
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.guide-card li {
    margin-bottom: 0.5rem;
}