/* ==========================================================
   Project 9 — Foam Model Aircraft
   ========================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0d0d0d;
    --surface: #161616;
    --surface-soft: #1e1e1e;
    --text: #f6f6f6;
    --muted: #c9c9c9;
    --primary: #ff4d00;
    --accent: #ff8c00;
    --radius-lg: 0;
    --radius-md: 0;
    --font: 'Inter', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    color: var(--text);
    font-family: var(--font);
    line-height: 1.65;
    overflow-x: hidden;
    cursor: none;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

/* Hero Actions */
.hero-actions {
    margin-top: 24px;
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Interactive Badge */
.interactive-badge {
    display: inline-block;
    margin-left: 12px;
    padding: 3px 10px;
    background: rgba(255, 77, 0, 0.15);
    border: 1px solid rgba(255, 77, 0, 0.4);
    border-radius: 999px;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--primary);
    vertical-align: middle;
    font-family: 'Space Mono', monospace;
    animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

.section-intro {
    color: var(--muted);
    font-size: 0.95rem;
    max-width: 700px;
    margin-bottom: 28px;
    line-height: 1.7;
}

/* ==========================================================
   Canvas Panel — Fuselage Profile
   ========================================================== */
.canvas-panel {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 24px;
    align-items: start;
}

.canvas-wrapper {
    position: relative;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 77, 0, 0.25);
    border-radius: var(--radius-md);
    overflow: hidden;
}

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

.canvas-hud {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 8px 16px;
    background: rgba(0, 0, 0, 0.7);
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    color: var(--primary);
    letter-spacing: 0.05em;
}

.canvas-controls {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 77, 0, 0.2);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-label {
    font-family: 'Space Mono', monospace;
    font-size: 0.72rem;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.control-value {
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    color: var(--text);
}

.control-btn {
    padding: 8px 16px;
    background: rgba(255, 77, 0, 0.1);
    border: 1px solid rgba(255, 77, 0, 0.3);
    color: var(--primary);
    font-family: 'Space Mono', monospace;
    font-size: 0.78rem;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-btn:hover,
.control-btn.active {
    background: rgba(255, 77, 0, 0.2);
    border-color: var(--primary);
}

.equation-display {
    font-family: 'Space Mono', monospace;
    font-size: 0.78rem;
    color: var(--text);
    line-height: 1.6;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 77, 0, 0.15);
}

.equation-display .dim {
    color: var(--muted);
}

/* Styled range slider */
.styled-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0;
    outline: none;
}

.styled-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(255, 77, 0, 0.4);
}

.styled-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* ==========================================================
   Design Iteration Viewer
   ========================================================== */
.iteration-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 0;
}

.iter-tab {
    flex: 1;
    padding: 16px 20px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-bottom: none;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    font-family: 'Space Mono', monospace;
}

.iter-tab:first-child {
    border-radius: var(--radius-md) 0 0 0;
}

.iter-tab:last-child {
    border-radius: 0 var(--radius-md) 0 0;
}

.iter-tab.active {
    background: rgba(255, 77, 0, 0.1);
    border-color: rgba(255, 77, 0, 0.3);
    color: var(--primary);
}

.iter-tab:hover:not(.active) {
    background: rgba(255, 255, 255, 0.05);
}

.iter-version {
    font-size: 1.1rem;
    font-weight: 700;
}

.iter-name {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.iteration-display {
    display: grid;
    grid-template-columns: 1fr 320px;
    border: 1px solid rgba(255, 77, 0, 0.2);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.4);
}

.iter-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    border-right: 1px solid rgba(255, 77, 0, 0.15);
}

.iter-visual canvas {
    width: 100%;
    height: auto;
}

.iter-specs {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    font-family: 'Space Mono', monospace;
    font-size: 0.82rem;
}

.iter-spec-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.iter-spec-label {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.72rem;
}

.iter-spec-value {
    color: var(--text);
    font-weight: 600;
}

.iter-change {
    font-family: 'Space Mono', monospace;
    font-size: 0.82rem;
    letter-spacing: 0.1em;
    color: var(--primary);
}

.iter-change.improved {
    background: rgba(81, 207, 102, 0.15);
    color: #51cf66;
}

.iter-change.new {
    background: rgba(255, 77, 0, 0.15);
    color: var(--primary);
}

.iter-desc {
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.6;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 77, 0, 0.15);
    font-family: 'Inter', sans-serif;
}

/* ==========================================================
   Aerodynamic Calculator
   ========================================================== */
.calc-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid rgba(255, 77, 0, 0.2);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: rgba(0, 0, 0, 0.4);
}

.calc-inputs,
.calc-outputs {
    padding: 28px;
}

.calc-inputs {
    border-right: 1px solid rgba(255, 77, 0, 0.15);
}

.calc-inputs h3,
.calc-outputs h3 {
    color: var(--primary);
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    margin-bottom: 20px;
    letter-spacing: 0.08em;
}

.calc-field {
    margin-bottom: 16px;
}

.calc-field label {
    display: block;
    font-family: 'Space Mono', monospace;
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.calc-field input {
    width: 100%;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 77, 0, 0.2);
    border-radius: 6px;
    color: var(--text);
    font-family: 'Space Mono', monospace;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
    border-radius: 0;
}

.calc-field input:focus {
    border-color: var(--primary);
}

.calc-result {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.result-label {
    font-family: 'Space Mono', monospace;
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.result-value {
    font-family: 'Space Mono', monospace;
    font-size: 1rem;
    color: var(--text);
    font-weight: 700;
}

.calc-verdict {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 24px;
    padding: 16px 20px;
    border-radius: 0;
    transition: all 0.3s;
}

.calc-verdict.good {
    background: rgba(81, 207, 102, 0.1);
    border: 1px solid rgba(81, 207, 102, 0.3);
}

.calc-verdict.bad {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
}

.verdict-icon {
    font-size: 1.4rem;
}

.calc-verdict.good .verdict-icon {
    color: #51cf66;
}

.calc-verdict.bad .verdict-icon {
    color: #ff6b6b;
}

.verdict-text {
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.calc-verdict.good .verdict-text {
    color: #51cf66;
}

.calc-verdict.bad .verdict-text {
    color: #ff6b6b;
}

/* ==========================================================
   Existing styles (two-col, stats, equations, weight table)
   ========================================================== */
.two-col {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

.stats-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    border-radius: 0;
}

.stat-item dt {
    color: var(--accent-color);
    font-family: var(--font-tech);
    font-size: 0.8rem;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-item dd {
    color: var(--text-main);
    font-size: 1rem;
    margin: 0;
    font-weight: 600;
}

.equation-block {
    background: rgba(0, 0, 0, 0.55);
    border: 1px solid rgba(255, 77, 0, 0.3);
    border-radius: 0;
    padding: 16px 20px;
    margin-top: 10px;
    overflow-x: auto;
    font-family: 'SFMono-Regular', Consolas, monospace;
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--text);
}

.equation-block code {
    background: none;
    padding: 0;
    font-size: inherit;
    color: inherit;
}

.weight-table {
    margin-top: 10px;
    overflow-x: auto;
}

.weight-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.weight-table th,
.weight-table td {
    padding: 10px 16px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.weight-table th {
    color: var(--accent, #ff8c00);
    font-family: 'Space Mono', monospace;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom-color: rgba(255, 77, 0, 0.3);
}

.weight-table .total-row td {
    border-top: 2px solid rgba(255, 77, 0, 0.5);
    border-bottom: none;
    color: var(--primary);
    font-size: 1.05rem;
}

.narrative-section p,
.project-writeup p,
.technical-specs p {
    color: var(--text);
    line-height: 1.7;
}

.narrative-section h3,
.project-writeup h3,
.technical-specs h3,
.key-features h3 {
    color: var(--accent-color);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.narrative-section ul,
.technical-specs ul,
.key-features ul {
    list-style: none;
    padding: 0;
}

.narrative-section li,
.technical-specs li,
.key-features li {
    color: var(--text);
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.narrative-section li::before,
.technical-specs li::before,
.key-features li::before {
    content: '>';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.technical-specs h4 {
    color: var(--accent, #ff8c00);
    font-size: 0.95rem;
    margin-top: 18px;
    margin-bottom: 6px;
    font-family: 'Space Mono', monospace;
    letter-spacing: 0.04em;
}

.project-writeup code,
.technical-specs code {
    background: rgba(255, 77, 0, 0.1);
    border: 1px solid rgba(255, 77, 0, 0.2);
    border-radius: 0;
    padding: 2px 6px;
    font-family: 'SFMono-Regular', Consolas, monospace;
    font-size: 0.88em;
    color: var(--primary);
}

/* back-to-top: inherits from shared-styles.css */

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 1080px) {

    .two-col,
    .canvas-panel,
    .iteration-display,
    .calc-panel {
        grid-template-columns: 1fr;
    }

    .iter-visual {
        border-right: none;
        border-bottom: 1px solid rgba(255, 77, 0, 0.15);
    }

    .calc-inputs {
        border-right: none;
        border-bottom: 1px solid rgba(255, 77, 0, 0.15);
    }
}

@media (max-width: 720px) {
    .project-hero {
        padding-top: 96px;
        padding-bottom: 72px;
    }

    .stats-list {
        grid-template-columns: 1fr;
    }

    .iteration-tabs {
        flex-direction: column;
    }

    .iter-tab:first-child {
        border-radius: var(--radius-md) var(--radius-md) 0 0;
    }

    .iter-tab:last-child {
        border-radius: 0;
    }
}