/* ==========================================================================
   Principia Robotica — Ultra-Modern Web Visualizer Stylesheet
   Design System: Dark Glassmorphic, Neon Accents, Premium Engineering Aesthetics
   Author: Abdullah Bin Zafar
   ========================================================================== */

:root {
    --bg-dark: #090d16;
    --bg-panel: rgba(15, 23, 42, 0.75);
    --bg-card: rgba(30, 41, 59, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-glow: rgba(56, 189, 248, 0.3);

    --primary-cyan: #38bdf8;
    --primary-glow: #0284c7;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    --purple-glow: #8b5cf6;

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;

    --font-heading: 'Outfit', -apple-system, sans-serif;
    --font-code: 'Fira Code', monospace;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;

    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.12) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.12) 0px, transparent 50%);
    color: var(--text-main);
    font-family: var(--font-heading);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.app-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
    min-height: 100vh;
}

/* ── Top Header ──────────────────────────────────────────────────────────── */
.header {
    background: var(--bg-panel);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-glass);
}

.brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    font-size: 32px;
    background: linear-gradient(135deg, var(--primary-cyan), var(--purple-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.5));
}

.brand-text h1 {
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 1px;
    background: linear-gradient(90deg, #ffffff, var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-text .subtitle {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 300;
}

.header-badges {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.badge {
    font-size: 11px;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid transparent;
}

.badge-primary { background: rgba(56, 189, 248, 0.15); color: var(--primary-cyan); border-color: rgba(56, 189, 248, 0.3); }
.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); border-color: rgba(16, 185, 129, 0.3); }
.badge-info    { background: rgba(139, 92, 246, 0.15); color: #a78bfa; border-color: rgba(139, 92, 246, 0.3); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); border-color: rgba(245, 158, 11, 0.3); }
.badge-author  { background: rgba(255, 255, 255, 0.08); color: var(--text-main); border-color: rgba(255, 255, 255, 0.2); }

/* ── Main Layout Grid ────────────────────────────────────────────────────── */
.main-grid {
    display: grid;
    grid-template-columns: 1fr 440px;
    gap: 20px;
    flex: 1;
}

@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-panel);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-glass);
}

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

.panel-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ── Buttons & Controls ─────────────────────────────────────────────────── */
.btn {
    font-family: var(--font-heading);
    font-size: 12px;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #0284c7, #2563eb);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border-color: rgba(255, 255, 255, 0.15);
}
.btn-secondary:hover { background: rgba(255, 255, 255, 0.15); }

.btn-danger {
    background: rgba(244, 63, 94, 0.15);
    color: var(--accent-rose);
    border-color: rgba(244, 63, 94, 0.3);
}
.btn-danger:hover { background: rgba(244, 63, 94, 0.25); }

.canvas-actions {
    display: flex;
    gap: 8px;
}

/* ── Canvas Section ──────────────────────────────────────────────────────── */
.canvas-wrapper {
    position: relative;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid rgba(56, 189, 248, 0.2);
    background: #040711;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
}

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

.hud-overlay {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    font-family: var(--font-code);
    font-size: 11px;
    background: rgba(9, 13, 22, 0.7);
    backdrop-filter: blur(8px);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.hud-item { display: flex; gap: 6px; align-items: center; }
.hud-label { color: var(--text-muted); }
.hud-value { font-weight: 600; color: var(--primary-cyan); }
.status-safe { color: var(--accent-emerald) !important; }
.status-modified { color: var(--accent-amber) !important; }
.status-danger { color: var(--accent-rose) !important; }

.mode-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    background: rgba(255, 255, 255, 0.03);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.mode-title { font-size: 12px; font-weight: 600; color: var(--text-muted); }

.btn-mode {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    font-size: 11px;
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-mode.active, .btn-mode:hover {
    background: rgba(56, 189, 248, 0.15);
    color: var(--primary-cyan);
    border-color: rgba(56, 189, 248, 0.4);
}

/* ── Telemetry Sidebar Cards ────────────────────────────────────────────── */
.telemetry-panel {
    gap: 16px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.card h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.gauge-bar-outer {
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

.gauge-bar-inner {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-emerald), var(--primary-cyan));
    transition: width 0.15s ease-out, background 0.3s;
    border-radius: 6px;
}

.gauge-val-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-top: 4px;
}

.metric-big {
    font-family: var(--font-code);
    font-size: 22px;
    font-weight: 700;
    color: var(--accent-emerald);
}

.metric-sub { font-size: 11px; color: var(--text-dim); }

/* Command comparison */
.cmd-comparison {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cmd-box {
    padding: 10px;
    border-radius: 6px;
    border: 1px solid transparent;
}

.cmd-ai { background: rgba(139, 92, 246, 0.1); border-color: rgba(139, 92, 246, 0.2); }
.cmd-safe { background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.3); }

.cmd-box-title { font-size: 11px; font-weight: 600; margin-bottom: 6px; color: var(--text-muted); }

.cmd-row {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
}

.val-code { font-family: var(--font-code); font-weight: 600; color: var(--primary-cyan); }
.arrow-divider { text-align: center; font-size: 11px; font-weight: 700; color: var(--text-dim); }

.perturbation-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    padding-top: 8px;
    border-top: 1px dashed var(--border-color);
}

.highlight-val { font-family: var(--font-code); font-size: 14px; color: var(--accent-amber); }

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

.control-group label {
    font-size: 12px;
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
}

input[type=range] {
    accent-color: var(--primary-cyan);
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    cursor: pointer;
}

/* Lyapunov */
.lyapunov-row {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.footer {
    background: var(--bg-panel);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-dim);
}

.separator { margin: 0 8px; opacity: 0.4; }
.link-gh { color: var(--primary-cyan); text-decoration: none; font-weight: 600; }
.link-gh:hover { text-decoration: underline; }