/* ============================================================
   StarTrail Zero — NPF Rule Shutter Speed Calculator
   Bespoke Astronomy & Night-Vision Dark Theme
   ============================================================ */

:root {
    /* Standard Deep-Space Astronomy Theme */
    --bg-primary: #070a14;
    --bg-surface: #0e1526;
    --bg-card: #151f38;
    --bg-hover: #1c2a4c;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --accent: #ff3b5c;
    --accent-secondary: #38bdf8;
    --accent-glow: rgba(255, 59, 92, 0.25);
    --border: #243254;
    --border-highlight: #3b82f6;

    --success: #22c55e;
    --warning: #eab308;
    --error: #ef4444;

    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    
    --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --shadow-accent: 0 0 25px rgba(255, 59, 92, 0.2);
}

/* ═══════════════════════════════════════════
   Night-Vision Pure Red Mode
   ═══════════════════════════════════════════ */
body.night-vision {
    --bg-primary: #000000;
    --bg-surface: #0a0000;
    --bg-card: #140000;
    --bg-hover: #220000;

    --text-primary: #ff3b3b;
    --text-secondary: #d42a2a;
    --text-muted: #881515;

    --accent: #ff0000;
    --accent-secondary: #ff3333;
    --accent-glow: rgba(255, 0, 0, 0.5);
    --border: #440000;
    --border-highlight: #ff0000;

    --success: #ff3b3b;
    --warning: #ff6666;
    --error: #ff0000;

    --shadow-card: 0 10px 30px rgba(255, 0, 0, 0.15);
    --shadow-accent: 0 0 25px rgba(255, 0, 0, 0.35);
}

body.night-vision * {
    text-shadow: 0 0 2px rgba(255, 0, 0, 0.4);
}

body.night-vision img,
body.night-vision canvas {
    filter: sepia(100%) hue-rotate(-50deg) saturate(600%) contrast(120%);
}

/* ═══════════════════════════════════════════
   Base & Layout
   ═══════════════════════════════════════════ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.app-header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 1rem;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.header-titles h1 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.header-titles h1 .highlight {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

body.night-vision .header-titles h1 .highlight {
    background: none;
    -webkit-text-fill-color: var(--accent);
    color: var(--accent);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 400;
}

.night-vision-btn {
    background: var(--bg-card);
    border: 1.5px solid var(--accent);
    color: var(--accent);
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-accent);
}

.night-vision-btn:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-1px);
}

body.night-vision .night-vision-btn {
    background: #ff0000;
    color: #000;
    border-color: #ff0000;
    font-weight: 700;
}

/* Main Container */
.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

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

@media (min-width: 900px) {
    .calculator-grid {
        grid-template-columns: 460px 1fr;
    }
}

/* Calc Panels */
.calc-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
}

.panel-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

/* Form Controls */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.label-with-val {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
}

.field-value-pill {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-secondary);
    background: rgba(56, 189, 248, 0.1);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    border: 1px solid rgba(56, 189, 248, 0.2);
}

body.night-vision .field-value-pill {
    color: #ff3b3b;
    background: rgba(255, 0, 0, 0.15);
    border-color: #aa0000;
}

.form-control {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    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-control:focus {
    outline: none;
    border-color: var(--border-highlight);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

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

.range-slider {
    width: 100%;
    accent-color: var(--accent);
    cursor: pointer;
}

/* Focal Presets */
.focal-presets {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.35rem;
    margin-top: 0.5rem;
}

.preset-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.4rem 0.2rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

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

.preset-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    font-weight: 700;
}

body.night-vision .preset-btn.active {
    background: #ff0000;
    color: #000;
}

/* Declination Guide */
.declination-guide {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* Pixel Pitch Badge */
.pixel-pitch-badge {
    background: rgba(15, 23, 42, 0.8);
    border: 1px dashed var(--border-highlight);
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

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

.badge-value {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--accent-secondary);

}

.badge-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
}

.panel-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 1.25rem 0;
}

/* ═══════════════════════════════════════════
   Results Column
   ═══════════════════════════════════════════ */

/* Hero Result Card */
.main-result-card {
    background: linear-gradient(145deg, rgba(255, 59, 92, 0.08), rgba(14, 21, 38, 0.95));
    border: 2px solid var(--accent);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    text-align: center;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-accent);
    position: relative;
    overflow: hidden;
}

body.night-vision .main-result-card {
    background: rgba(30, 0, 0, 0.8);
    border-color: #ff0000;
}

.result-badge-top {
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.hero-shutter-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
    margin: 0.25rem 0;
}

.big-number {
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
    color: #ffffff;
}

body.night-vision .big-number {
    color: #ff0000;
}

.hero-shutter-value .unit {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.shutter-setting-suggestion {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-top: 0.4rem;
}

.shutter-setting-suggestion strong {
    font-family: var(--font-mono);
    color: var(--accent-secondary);
    font-size: 1.1rem;
}

/* Verdict Banner */
.verdict-banner {
    margin-top: 1rem;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.verdict-banner.pinpoint {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.4);
    color: var(--success);
}

/* Canvas Simulation Card */
.canvas-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

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

.canvas-header h3 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
}

.canvas-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.canvas-container {
    width: 100%;
    background: #04060b;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
}

#star-sim-canvas {
    width: 100%;
    height: auto;
    display: block;
}

.canvas-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

.sim-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.sim-mode-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: var(--font-mono);
    cursor: pointer;
    transition: all 0.15s ease;
}

.sim-mode-btn.active {
    background: var(--border-highlight);
    border-color: var(--border-highlight);
    color: #fff;
}

/* Comparison Grid */
.comparison-header {
    margin-bottom: 0.75rem;
}

.comparison-header h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
}

.comparison-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.comp-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    text-align: center;
    transition: all 0.2s ease;
}

.comp-card.active {
    border-color: var(--accent);
    box-shadow: 0 0 15px rgba(255, 59, 92, 0.15);
}

.comp-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.comp-time {
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 800;
    margin: 0.25rem 0;
}

.comp-status {
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    padding: 0.15rem 0.4rem;
    display: inline-block;
    margin-bottom: 0.25rem;
}

.status-pinpoint {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

.status-oval {
    background: rgba(234, 179, 8, 0.15);
    color: var(--warning);
}

.status-blurred {
    background: rgba(239, 68, 68, 0.15);
    color: var(--error);
}

.comp-drift {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Breakdown Table */
.breakdown-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.breakdown-card h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.breakdown-table th,
.breakdown-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.breakdown-table th {
    color: var(--text-secondary);
    font-weight: 500;
    width: 55%;
}

.breakdown-table td {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-weight: 600;
}

.highlight-val {
    color: var(--accent-secondary) !important;
}

/* Educational Content Section */
.educational-section {
    margin-top: 3rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-card);
}

.educational-section h2 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

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

.guide-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.guide-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-secondary);
    margin-bottom: 0.75rem;
}

body.night-vision .guide-card h3 {
    color: #ff3b3b;
}

.guide-card p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.guide-list {
    margin: 0.75rem 0 0.75rem 1.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.guide-list li {
    margin-bottom: 0.4rem;
}

.formula-box {
    background: rgba(14, 21, 38, 0.8);
    border: 1px solid var(--border-highlight);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    margin-top: 1rem;
}

.checklist {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.check-item {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.check-item .chk {
    color: var(--success);
    font-weight: 800;
}

/* Ad Placeholders */
.ad-placeholder {
    background: var(--bg-card);
    border: 1px dashed var(--border);
    color: var(--text-muted);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    margin: 1rem auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-desktop {
    width: 728px;
    height: 90px;
    display: none;
}

.ad-mobile {
    width: 320px;
    height: 50px;
    display: flex;
}

@media (min-width: 768px) {
    .ad-desktop {
        display: flex;
    }
    .ad-mobile {
        display: none;
    }
}