/* ==========================================================================
   CordageArchitect - Paracord Weave Length Calculator
   Bespoke Theme: Tactical Forest Green & High-Visibility Survival Orange
   ========================================================================== */

:root {
    --bg-primary: #0b1712;
    --bg-surface: #13261e;
    --bg-surface-elevated: #1a3328;
    --bg-hover: #224235;
    
    --text-primary: #f0fdf4;
    --text-secondary: #a7f3d0;
    --text-muted: #64748b;
    
    --accent: #f97316;
    --accent-hover: #ea580c;
    --accent-glow: rgba(249, 115, 22, 0.25);
    
    --olive: #84cc16;
    --olive-dark: #365314;
    
    --border: rgba(249, 115, 22, 0.2);
    --border-subtle: rgba(167, 243, 208, 0.12);
    --border-hover: rgba(249, 115, 22, 0.5);
    
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(249, 115, 22, 0.15);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* App Header Styling */
.app-header {
    text-align: center;
    padding: 2.5rem 1rem 1.5rem;
    background: radial-gradient(circle at 50% 0%, rgba(249, 115, 22, 0.12) 0%, rgba(11, 23, 18, 0) 70%);
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.85rem;
    background: rgba(249, 115, 22, 0.15);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.03em;
    margin-bottom: 0.75rem;
}

.app-header h1 {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin: 0 0 0.5rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.app-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 400;
}

/* App Main Container */
.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

/* Main Calculator Grid Layout */
.calculator-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 1rem;
}

@media (min-width: 900px) {
    .calculator-container {
        grid-template-columns: 1fr 1fr;
    }
}

/* Calculator Panel Style */
.calc-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.panel-header h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    color: var(--text-primary);
}

.live-pill {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--success);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Unit Toggle Buttons */
.unit-toggle-group {
    display: flex;
    background: var(--bg-primary);
    padding: 3px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
}

.unit-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.unit-btn.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(249, 115, 22, 0.3);
}

/* Form Controls */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

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

label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.label-with-val {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.input-val-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    background: rgba(249, 115, 22, 0.12);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

input[type="number"], select {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
    box-sizing: border-box;
}

input[type="number"]:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-with-slider {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.input-with-slider input[type="number"] {
    width: 100px;
    flex-shrink: 0;
}

input[type="range"] {
    flex: 1;
    accent-color: var(--accent);
    cursor: pointer;
    height: 6px;
}

.field-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Preset Cards Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.65rem;
}

.preset-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.75rem 0.85rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.preset-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-surface-elevated);
}

.preset-card.active {
    border-color: var(--accent);
    background: var(--bg-surface-elevated);
    box-shadow: 0 0 12px var(--accent-glow);
}

.preset-title {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.preset-ratio {
    font-size: 0.72rem;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

/* Screen reader only utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Results Hero Cards */
.hero-results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.hero-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.hero-card.primary-hero {
    border-color: var(--accent);
    background: radial-gradient(circle at 90% 10%, rgba(249, 115, 22, 0.15) 0%, var(--bg-primary) 70%);
}

.hero-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.hero-value-group {
    display: flex;
    flex-direction: column;
}

.hero-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

.hero-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.hero-tag {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Dual Color Box */
.dual-color-breakdown {
    background: rgba(132, 204, 22, 0.08);
    border: 1px dashed rgba(132, 204, 22, 0.4);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.dual-color-breakdown.hidden {
    display: none;
}

.dual-color-breakdown h3 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--olive);
}

.dual-color-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.color-strand-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
}

.strand-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.strand-length {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--olive);
}

.strand-sub {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.fused-tip {
    margin: 0;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Segment Breakdown Bar */
.breakdown-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.breakdown-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.breakdown-bar {
    display: flex;
    height: 12px;
    border-radius: 6px;
    overflow: hidden;
    background: #000;
}

.segment-core {
    background: #38bdf8;
}

.segment-knot {
    background: var(--accent);
}

.segment-tail {
    background: var(--olive);
}

.breakdown-legend {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.dot-core { background: #38bdf8; }
.dot-knot { background: var(--accent); }
.dot-tail { background: var(--olive); }

/* Canvas Rendering Card */
.canvas-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.canvas-header h3 {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
}

.canvas-spec {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
}

.canvas-wrapper {
    width: 100%;
    background: #060e0a;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid rgba(167, 243, 208, 0.08);
}

canvas {
    display: block;
    width: 100%;
    height: auto;
}

/* Specs & Weight Advisor Grid */
.spec-advisor-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.spec-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 0.65rem 0.85rem;
    display: flex;
    flex-direction: column;
}

.spec-label {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.spec-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Deep Content Section */
.content-depth-section {
    margin-top: 3rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.content-depth-section h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.6rem;
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: 1rem;
}

.guide-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

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

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

.guide-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    color: var(--accent);
    margin-top: 0;
    margin-bottom: 0.75rem;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.75rem;
    font-size: 0.82rem;
}

.spec-table th, .spec-table td {
    padding: 0.5rem 0.65rem;
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

.spec-table th {
    color: var(--text-secondary);
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
}

.spec-table td {
    color: var(--text-muted);
}

/* FAQ Accordion */
.faq-section {
    margin-top: 2rem;
}

.faq-section h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.85rem 1.1rem;
    margin-bottom: 0.75rem;
}

.faq-item summary {
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
}

.faq-item summary:hover {
    color: var(--accent);
}

.faq-item p {
    margin: 0.75rem 0 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}