/* === CSS Variables & Themes === */
:root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-panel: #181818;
    --bg-input: #252525;
    --border-color: #333;
    --border-accent: #444;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-dim: #707070;
    --accent-cyan: #00bcd4;
    --accent-orange: #ff9800;
    --accent-amber: #ffc107;
    --accent-green: #4caf50;
    --accent-red: #f44336;
    --accent-yellow: #ffeb3b;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --ring-border: #3a3a3a;
    --toggle-bg: #2a2a2a;
    --toggle-active: #00bcd4;
    --font-mono: 'Courier New', 'Roboto Mono', monospace;
    --font-sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: 0.25s ease;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-panel: #f0f2f5;
    --bg-input: #e8eaed;
    --border-color: #d0d5dd;
    --border-accent: #b0b5bd;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5e;
    --text-dim: #8a8a9e;
    --accent-cyan: #00838f;
    --accent-orange: #e65100;
    --accent-amber: #f57f17;
    --accent-green: #2e7d32;
    --accent-red: #c62828;
    --accent-yellow: #f9a825;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --ring-border: #c0c5ce;
    --toggle-bg: #dde1e6;
    --toggle-active: #00838f;
}

/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

/* === App Container === */
.app-container {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
    gap: 2rem;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
    min-height: 100vh;
}

/* === Disc Container === */
.disc-container {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    top: 1.5rem;
    align-self: flex-start;
}

.disc-wrapper {
    position: relative;
    width: min(70vw, 70vh, 600px);
    height: min(70vw, 70vh, 600px);
    border-radius: 50%;
    box-shadow: var(--shadow);
}

#raobf-canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
    border-radius: 50%;
}

#raobf-canvas:active {
    cursor: grabbing;
}

#raobf-canvas.dragging {
    cursor: grabbing;
}

/* === Side Panel === */
.panel {
    flex: 1 1 340px;
    max-width: 420px;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.panel-header {
    text-align: center;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h1 {
    font-family: var(--font-sans);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent-cyan);
}

.panel-header .subtitle {
    font-size: 0.75rem;
    color: var(--text-dim);
    font-family: var(--font-mono);
    letter-spacing: 0.08em;
    margin-top: 0.25rem;
}

/* === Toggle Controls Row === */
.controls-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.toggle-group {
    flex: 1;
    min-width: 110px;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.toggle-group .label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    font-weight: 600;
}

.toggle-buttons {
    display: flex;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-accent);
}

.toggle-btn {
    flex: 1;
    padding: 0.45rem 0.6rem;
    font-size: 0.8rem;
    font-family: var(--font-mono);
    font-weight: 600;
    background: var(--toggle-bg);
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    text-align: center;
    white-space: nowrap;
}

.toggle-btn:hover {
    background: var(--bg-input);
}

.toggle-btn.active {
    background: var(--toggle-active);
    color: #fff;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.15);
}

/* === Calculator Sections === */
.calc-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1rem 1.15rem;
    border: 1px solid var(--border-color);
    transition: background var(--transition), border-color var(--transition);
}

.calc-section h3 {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.calc-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
    align-items: center;
}

.calc-row:last-child {
    margin-bottom: 0;
}

.calc-input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.calc-input-group label {
    font-size: 0.62rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    font-weight: 600;
}

.calc-input-group input {
    width: 100%;
    padding: 0.5rem 0.6rem;
    font-size: 0.85rem;
    font-family: var(--font-mono);
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition), background var(--transition), color var(--transition);
    outline: none;
}

.calc-input-group input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 2px rgba(0, 188, 212, 0.15);
}

.calc-input-group input.small {
    font-size: 0.78rem;
    padding: 0.4rem 0.5rem;
}

.calc-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.75rem;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
    border: 1px solid var(--border-accent);
}

.calc-result .result-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    font-weight: 600;
}

.calc-result .result-value {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-amber);
}

.calc-result .result-unit {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-left: 0.25rem;
}

/* === AoB Visual Indicator === */
.aob-orientation {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.72rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    margin-top: 0.35rem;
}

.aob-orientation .port {
    color: #e04040;
}

.aob-orientation .starboard {
    color: #40c040;
}

/* === Reset Button === */
.btn-reset {
    display: block;
    width: 100%;
    padding: 0.7rem;
    font-size: 0.8rem;
    font-family: var(--font-sans);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-reset:hover {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-cyan);
}

/* === Footer === */
.panel-footer {
    text-align: center;
    font-size: 0.6rem;
    color: var(--text-dim);
    margin-top: auto;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    font-family: var(--font-mono);
    letter-spacing: 0.06em;
}

/* === Responsive Design === */
@media (max-width: 850px) {
    .app-container {
        flex-direction: column;
        align-items: center;
        padding: 1rem;
        gap: 1.5rem;
    }

    .disc-container {
        position: static;
        width: 100%;
    }

    .disc-wrapper {
        width: min(85vw, 85vh, 480px);
        height: min(85vw, 85vh, 480px);
    }

    .panel {
        max-width: 100%;
        width: 100%;
    }

    .controls-row {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 0.75rem;
        gap: 1rem;
    }

    .disc-wrapper {
        width: min(92vw, 92vh, 380px);
        height: min(92vw, 92vh, 380px);
    }

    .panel {
        padding: 1rem;
        gap: 0.85rem;
    }

    .calc-section {
        padding: 0.75rem 0.85rem;
    }

    .toggle-buttons .toggle-btn {
        font-size: 0.7rem;
        padding: 0.4rem 0.5rem;
    }
}