/* ==========================================================================
   AeroBalance (rc-plane-cg-mac) - Bespoke Aeronautical Blueprint CSS
   ========================================================================== */

:root {
    --bg-primary: #071326;
    --bg-surface: #0e1d38;
    --bg-surface-elevated: #13274a;
    --bg-hover: #19325c;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #38bdf8;
    --accent-cyan: #06b6d4;
    --accent-light: #7dd3fc;
    --accent-glow: rgba(56, 189, 248, 0.2);
    --border: #1e3a5f;
    --border-hover: #38bdf8;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.25);
}

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

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

.app-header {
    text-align: center;
    padding: 2.5rem 1rem 1.5rem;
    background: linear-gradient(180deg, rgba(14, 29, 56, 0.8) 0%, rgba(7, 19, 38, 0) 100%);
    border-bottom: 1px solid var(--border);
}

.app-header h1 {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    margin: 0;
    background: linear-gradient(135deg, #f8fafc 0%, #38bdf8 60%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.app-header p {
    color: var(--accent);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.15rem;
    margin: 0.3rem 0 0;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   Ad Placeholders
   -------------------------------------------------------------------------- */
.ad-placeholder {
    background: rgba(14, 29, 56, 0.5);
    border: 1px dashed var(--border);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-align: center;
    margin: 1.5rem auto;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-desktop {
    width: 728px;
    height: 90px;
    max-width: 100%;
}

.ad-mobile {
    width: 320px;
    height: 50px;
    max-width: 100%;
    display: none;
}

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

/* --------------------------------------------------------------------------
   Blueprint Hero Banner
   -------------------------------------------------------------------------- */
.blueprint-banner {
    background: radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.12) 0%, transparent 60%), var(--bg-surface);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.banner-badge {
    display: inline-block;
    background: rgba(56, 189, 248, 0.15);
    color: var(--accent-light);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    border: 1px solid rgba(56, 189, 248, 0.3);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.blueprint-banner h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin: 0 0 0.5rem;
    color: var(--text-primary);
}

.blueprint-banner p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
    max-width: 900px;
}

/* --------------------------------------------------------------------------
   Cards & Layout Grid
   -------------------------------------------------------------------------- */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-md);
}

.section-title-bar h3, .form-header h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

@media (min-width: 992px) {
    .calculator-grid {
        grid-template-columns: 420px 1fr;
    }
}

/* --------------------------------------------------------------------------
   Presets Grid
   -------------------------------------------------------------------------- */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

.preset-btn {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.85rem 1rem;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
}

.preset-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.preset-btn.active {
    background: rgba(56, 189, 248, 0.15);
    border-color: var(--accent);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.preset-icon {
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.preset-label {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.preset-sub {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.1rem;
}

/* --------------------------------------------------------------------------
   Form Inputs & Controls
   -------------------------------------------------------------------------- */
.form-group {
    margin-bottom: 1.1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.unit-label {
    color: var(--accent-light);
    font-family: var(--font-mono);
    font-weight: normal;
    font-size: 0.85rem;
}

.form-control {
    width: 100%;
    box-sizing: border-box;
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    padding: 0.6rem 0.8rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

.form-text {
    display: block;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Segmented Control Toggle */
.segmented-control {
    display: flex;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 3px;
}

.segment-btn {
    flex: 1;
    background: transparent;
    border: none;
    border-radius: 4px;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0.45rem 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.segment-btn.active {
    background: var(--accent);
    color: #071326;
    font-weight: 700;
}

/* Mini Label Toggle */
.label-with-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.35rem;
}

.mini-toggle {
    display: flex;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px;
}

.toggle-btn {
    background: transparent;
    border: none;
    border-radius: 3px;
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.toggle-btn.active {
    background: rgba(56, 189, 248, 0.25);
    color: var(--accent-light);
}

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

.input-suffix {
    position: absolute;
    right: 0.8rem;
    color: var(--accent-light);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    pointer-events: none;
}

/* Slider & Preset Pills */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.35rem;
}

.slider-val {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--accent);
    font-size: 1rem;
}

.range-slider {
    width: 100%;
    accent-color: var(--accent);
    background: var(--bg-primary);
    height: 6px;
    border-radius: 3px;
    cursor: pointer;
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
}

.preset-pills {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}

.pill-btn {
    flex: 1;
    min-width: 100px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.76rem;
    font-weight: 600;
    padding: 0.35rem 0.6rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.pill-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.pill-btn.active {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent);
    color: var(--accent-light);
}

.stability-note {
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.25);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    margin-top: 1rem;
    display: flex;
    gap: 0.6rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.stability-note p {
    margin: 0;
}

/* --------------------------------------------------------------------------
   Blueprint Canvas Card & Visualizer
   -------------------------------------------------------------------------- */
.blueprint-card {
    padding: 1rem;
}

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

.canvas-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent);
    box-shadow: 0 0 8px var(--accent);
}

.canvas-controls {
    display: flex;
    gap: 0.4rem;
}

.canvas-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.3rem 0.6rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.canvas-btn:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.canvas-btn.active {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--accent);
    color: var(--accent-light);
}

.canvas-wrapper {
    position: relative;
    background-color: #040a14;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

canvas#wingCanvas {
    display: block;
    width: 100%;
    height: auto;
    background-color: #040a14;
    cursor: crosshair;
}

.canvas-hover-info {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(7, 19, 38, 0.85);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-light);
    pointer-events: none;
}

.canvas-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 0.75rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.legend-box {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.root-line { background: #38bdf8; }
.mac-line { background: #f59e0b; border: 1px dashed #f59e0b; }
.cg-marker { background: #ef4444; border-radius: 50%; }
.np-marker { background: #22c55e; border-radius: 50%; }

/* --------------------------------------------------------------------------
   Stability Banner & Badges
   -------------------------------------------------------------------------- */
.stability-banner {
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    transition: all 0.3s ease;
}

.stability-banner.optimal {
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.35);
}

.stability-banner.optimal h4 { color: #4ade80; }

.stability-banner.warning {
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.stability-banner.warning h4 { color: #fbbf24; }

.stability-banner.danger {
    background: rgba(239, 68, 68, 0.18);
    border: 1px solid rgba(239, 68, 68, 0.5);
    animation: pulseDanger 2s infinite ease-in-out;
}

.stability-banner.danger h4 { color: #f87171; }

@keyframes pulseDanger {
    0%, 100% { box-shadow: 0 0 0 rgba(239, 68, 68, 0); }
    50% { box-shadow: 0 0 15px rgba(239, 68, 68, 0.3); }
}

.banner-icon {
    font-size: 1.8rem;
    line-height: 1;
}

.banner-content h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin: 0 0 0.2rem;
    letter-spacing: 0.02em;
}

.banner-content p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Results Cards Grid
   -------------------------------------------------------------------------- */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.85rem;
}

.result-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
}

.result-card.primary-highlight {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(14, 29, 56, 0.9) 100%);
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.result-card.secondary-highlight {
    background: rgba(6, 182, 212, 0.08);
    border-color: var(--accent-cyan);
}

.result-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.result-value-group {
    display: flex;
    align-items: baseline;
    gap: 0.3rem;
    margin: 0.3rem 0;
}

.result-val {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.7rem;
    color: var(--text-primary);
}

.result-card.primary-highlight .result-val {
    color: var(--accent);
    font-size: 2.1rem;
}

.result-subtext {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: auto;
}

/* --------------------------------------------------------------------------
   Educational Content Section
   -------------------------------------------------------------------------- */
.educational-section {
    margin-top: 2.5rem;
}

.educational-section h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-top: 0;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.75rem;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.25rem;
}

.content-block h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--accent-light);
    margin: 0 0 0.5rem;
}

.content-block p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0 0 0.75rem;
}

.formula-box {
    background: #040a14;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-light);
}

.formula-box p {
    color: var(--text-secondary);
    margin: 0.4rem 0 0.2rem;
    font-size: 0.8rem;
}

.formula-box code {
    display: block;
    background: rgba(56, 189, 248, 0.1);
    padding: 0.3rem 0.5rem;
    border-radius: 4px;
    color: #f8fafc;
    margin-bottom: 0.5rem;
}

.bullet-list, .ordered-list {
    padding-left: 1.2rem;
    margin: 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.bullet-list li, .ordered-list li {
    margin-bottom: 0.4rem;
}