frontend/src/App.css

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700;800&display=swap');

:root {
  --bg-gradient: linear-gradient(135deg, #09090b 0%, #1e1b4b 100%);
  --glass-bg: rgba(15, 23, 42, 0.4);
  --glass-border: rgba(255, 255, 255, 0.08);
  --neon-blue: #38bdf8;
  --neon-blue-glow: rgba(56, 189, 248, 0.6);
  --neon-pink: #f472b6;
  --neon-pink-glow: rgba(244, 114, 182, 0.6);
  --neon-purple: #c084fc;
  --neon-purple-glow: rgba(192, 132, 252, 0.6);
  --neon-green: #34d399;
  --neon-green-glow: rgba(52, 211, 153, 0.6);
  --asphalt: #18181b;
  --line-color: rgba(255,255,255,0.15);
  --stop-line: #cbd5e1;
}

body {
  margin: 0; padding: 0;
  font-family: 'Outfit', sans-serif;
  background: var(--bg-gradient);
  color: white;
  min-height: 100vh;
  overflow-x: hidden;
}

* { box-sizing: border-box; }

/* Moving background blobs */
.bg-blob { position: fixed; border-radius: 50%; filter: blur(100px); z-index: -1; opacity: 0.4; animation: float 10s infinite alternate; }
.blob-1 { width: 400px; height: 400px; background: rgba(56, 189, 248, 0.2); top: 10%; left: 10%; }
.blob-2 { width: 500px; height: 500px; background: rgba(192, 132, 252, 0.15); bottom: 10%; right: 10%; }
.blob-3 { width: 300px; height: 300px; background: rgba(52, 211, 153, 0.15); bottom: 50%; left: 40%; animation-delay: -5s; }

@keyframes float { 100% { transform: translateY(50px) translateX(50px); } }

/* Layout */
.app-container { max-width: 1400px; margin: 0 auto; padding: 2rem; }

.premium-header {
  display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem;
  padding: 1.5rem 2rem; background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: 16px; backdrop-filter: blur(20px);
}
.header-brand { display: flex; align-items: center; gap: 1rem; }
.icon-wrapper { background: rgba(56,189,248,0.1); color: var(--neon-blue); padding: 12px; border-radius: 12px; border: 1px solid rgba(56,189,248,0.2); }
.header-brand h1 { margin: 0; font-size: 1.5rem; font-weight: 800; letter-spacing: 1px; }
.header-brand p { margin: 0; color: #94a3b8; font-size: 0.875rem; font-weight: 300; }

.header-status { display: flex; align-items: center; gap: 0.75rem; background: rgba(0,0,0,0.3); padding: 0.5rem 1.25rem; border-radius: 999px; border: 1px solid var(--glass-border); font-size: 0.875rem; font-weight: 600; letter-spacing: 1px; }
.pulse-dot { width: 8px; height: 8px; background: var(--neon-green); border-radius: 50%; box-shadow: 0 0 10px var(--neon-green); animation: pulse 2s infinite; }
@keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.3; } 100% { opacity: 1; } }

.main-layout { display: grid; grid-template-columns: 1fr 380px; gap: 2rem; }

/* INTERSECTION CENTERPIECE */
.intersection-wrapper {
  position: relative; border-radius: 24px; padding: 2rem; display: flex; flex-direction: column; align-items: center;
  background: rgba(0,0,0,0.2); border: 1px solid var(--glass-border); box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
  overflow: hidden;
}

.intersection-container {
  position: relative; width: 600px; height: 600px; background: #000; border-radius: 20px;
  box-shadow: inset 0 0 50px rgba(0,0,0,0.8); overflow: hidden; margin-bottom: 2rem;
}

.road { position: absolute; background: var(--asphalt); }
.road-vertical { width: 160px; height: 100%; left: 50%; transform: translateX(-50%); border-left: 2px solid var(--line-color); border-right: 2px solid var(--line-color); }
.road-horizontal { width: 100%; height: 160px; top: 50%; transform: translateY(-50%); border-top: 2px solid var(--line-color); border-bottom: 2px solid var(--line-color); }

.lane-divider { position: absolute; }
.vertical-left, .vertical-right { width: 2px; height: 100%; background: var(--line-color); background-image: linear-gradient(to bottom, var(--line-color) 50%, transparent 50%); background-size: 100% 30px; }
.vertical-left { left: 53px; }
.vertical-right { left: 106px; }

.horizontal-top, .horizontal-bottom { width: 100%; height: 2px; background: var(--line-color); background-image: linear-gradient(to right, var(--line-color) 50%, transparent 50%); background-size: 30px 100%; }
.horizontal-top { top: 53px; }
.horizontal-bottom { top: 106px; }

.stop-line { position: absolute; background: var(--stop-line); }
.sl-top { width: 160px; height: 4px; top: 220px; }
.sl-bottom { width: 160px; height: 4px; bottom: 220px; }
.sl-left { height: 160px; width: 4px; left: 220px; }
.sl-right { height: 160px; width: 4px; right: 220px; }

.intersection-center {
  position: absolute; width: 160px; height: 160px; background: var(--asphalt);
  left: 50%; top: 50%; transform: translate(-50%, -50%); z-index: 2;
  display: flex; align-items: center; justify-content: center;
}
.center-logo {
  width: 80px; height: 80px; border-radius: 50%; border: 2px dashed rgba(255,255,255,0.05); display: flex; align-items: center; justify-content: center;
}

/* Premium Traffic Lights */
.traffic-fixture {
  position: absolute; display: flex; background: #27272a; padding: 8px; border-radius: 12px;
  gap: 8px; z-index: 10; border: 2px solid #3f3f46; box-shadow: 0 10px 20px rgba(0,0,0,0.5), inset 0 2px 5px rgba(255,255,255,0.1);
}
.t-light { width: 16px; height: 16px; border-radius: 50%; background: #000; box-shadow: inset 0 2px 4px rgba(0,0,0,0.8); transition: all 0.3s; }
.t-light.red.active { background: #ef4444; box-shadow: 0 0 20px #ef4444, inset 0 0 5px #fff; }
.t-light.green.active { background: #10b981; box-shadow: 0 0 20px #10b981, inset 0 0 5px #fff; }

.tf-north { flex-direction: column; top: 120px; left: 140px; }
.tf-south { flex-direction: column; bottom: 120px; right: 140px; }
.tf-east { top: 140px; right: 120px; }
.tf-west { bottom: 140px; left: 120px; }

/* Vehicles */
.queue { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 5; pointer-events: none; }
.car { position: absolute; border-radius: 6px; display: flex; justify-content: center; align-items: center; }
.car-glow { width: 100%; height: 100%; border-radius: inherit; }

.car-n { width: 22px; height: 40px; }
.car-n .car-glow { background: linear-gradient(180deg, var(--neon-blue) 0%, #1e40af 100%); box-shadow: 0 0 15px var(--neon-blue-glow); }
.car-n.straight { bottom: calc(50% + 80px + (var(--idx) * 45px)); left: calc(50% - 66px); }
.car-n.left-turn { bottom: calc(50% + 80px + (var(--idx) * 45px)); left: calc(50% - 14px); }

.car-s { width: 22px; height: 40px; }
.car-s .car-glow { background: linear-gradient(0deg, var(--neon-pink) 0%, #9d174d 100%); box-shadow: 0 0 15px var(--neon-pink-glow); }
.car-s.straight { top: calc(50% + 80px + (var(--idx) * 45px)); left: calc(50% + 44px); }
.car-s.left-turn { top: calc(50% + 80px + (var(--idx) * 45px)); left: calc(50% - 8px); }

.car-e { width: 40px; height: 22px; }
.car-e .car-glow { background: linear-gradient(270deg, var(--neon-purple) 0%, #5b21b6 100%); box-shadow: 0 0 15px var(--neon-purple-glow); }
.car-e.straight { left: calc(50% + 80px + (var(--idx) * 45px)); top: calc(50% - 66px); }
.car-e.left-turn { left: calc(50% + 80px + (var(--idx) * 45px)); top: calc(50% - 14px); }

.car-w { width: 40px; height: 22px; }
.car-w .car-glow { background: linear-gradient(90deg, var(--neon-green) 0%, #065f46 100%); box-shadow: 0 0 15px var(--neon-green-glow); }
.car-w.straight { right: calc(50% + 80px + (var(--idx) * 45px)); top: calc(50% + 44px); }
.car-w.left-turn { right: calc(50% + 80px + (var(--idx) * 45px)); top: calc(50% - 8px); }

/* Animations */
@keyframes pSV { to { transform: translateY(300px); opacity: 0; } }
@keyframes pSVU { to { transform: translateY(-300px); opacity: 0; } }
@keyframes pSH { to { transform: translateX(-300px); opacity: 0; } }
@keyframes pSHR { to { transform: translateX(300px); opacity: 0; } }
@keyframes tLN { to { transform: translate(150px, 150px) rotate(-90deg); opacity: 0; } }
@keyframes tLS { to { transform: translate(-150px, -150px) rotate(-90deg); opacity: 0; } }
@keyframes tLE { to { transform: translate(-150px, 150px) rotate(-90deg); opacity: 0; } }
@keyframes tLW { to { transform: translate(150px, -150px) rotate(-90deg); opacity: 0; } }

.car-n.straight.animating { animation: pSV 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-n.left-turn.animating { animation: tLN 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-s.straight.animating { animation: pSVU 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-s.left-turn.animating { animation: tLS 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-e.straight.animating { animation: pSH 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-e.left-turn.animating { animation: tLE 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-w.straight.animating { animation: pSHR 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
.car-w.left-turn.animating { animation: tLW 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards; }

/* Control Bar */
.premium-controls {
  display: flex; gap: 1rem; background: rgba(0,0,0,0.4); padding: 1rem 2rem; border-radius: 999px;
  border: 1px solid var(--glass-border); box-shadow: 0 10px 30px rgba(0,0,0,0.5); backdrop-filter: blur(10px);
}
.p-btn {
  display: flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.5rem; border: none; border-radius: 999px;
  font-weight: 700; cursor: pointer; transition: all 0.2s; font-family: 'Outfit', sans-serif; letter-spacing: 1px;
}
.btn-play { background: var(--neon-blue); color: #000; box-shadow: 0 0 15px var(--neon-blue-glow); }
.btn-play:hover { transform: translateY(-2px); box-shadow: 0 0 25px var(--neon-blue-glow); }
.btn-pause { background: var(--neon-pink); color: #000; box-shadow: 0 0 15px var(--neon-pink-glow); }
.btn-ghost { background: transparent; color: white; border: 1px solid rgba(255,255,255,0.2); }
.btn-ghost:hover:not(:disabled) { background: rgba(255,255,255,0.1); }
.btn-ghost:disabled { opacity: 0.3; cursor: not-allowed; }
.control-divider { width: 1px; background: rgba(255,255,255,0.1); margin: 0 0.5rem; }
.p-select { background: transparent; color: white; border: none; outline: none; font-family: 'Outfit'; font-weight: 600; cursor: pointer; }
.p-select option { background: #18181b; }

/* Sidebar Metrics */
.metrics-sidebar { display: flex; flex-direction: column; gap: 1.5rem; }
.glass-card { background: var(--glass-bg); backdrop-filter: blur(20px); border: 1px solid var(--glass-border); border-radius: 20px; padding: 1.5rem; }
.glass-card h3 { margin: 0 0 1rem 0; font-size: 0.875rem; text-transform: uppercase; letter-spacing: 2px; color: #94a3b8; }

.primary-card { background: linear-gradient(135deg, rgba(56, 189, 248, 0.1) 0%, rgba(15, 23, 42, 0.4) 100%); border: 1px solid rgba(56,189,248,0.3); }
.big-metric { display: flex; flex-direction: column; margin-bottom: 1rem; }
.big-metric .value { font-size: 3.5rem; font-weight: 800; line-height: 1; color: var(--neon-blue); text-shadow: 0 0 20px var(--neon-blue-glow); }
.big-metric .label { font-size: 0.875rem; color: #cbd5e1; margin-top: 0.5rem; font-weight: 300; }

.mini-progress { width: 100%; height: 4px; background: rgba(0,0,0,0.3); border-radius: 2px; overflow: hidden; margin-bottom: 0.5rem; }
.mini-progress .fill { height: 100%; background: var(--neon-blue); box-shadow: 0 0 10px var(--neon-blue); transition: width 0.3s; }
.step-count { font-size: 0.75rem; color: #64748b; font-weight: 600; }

.reward-value { font-size: 2.5rem; font-weight: 800; }
.reward-value.positive { color: var(--neon-green); text-shadow: 0 0 15px var(--neon-green-glow); }
.reward-value.negative { color: var(--neon-pink); text-shadow: 0 0 15px var(--neon-pink-glow); }
.reward-desc { font-size: 0.875rem; color: #94a3b8; margin: 0.5rem 0 0 0; line-height: 1.4; }

.telemetry-grid { display: flex; flex-direction: column; gap: 0.75rem; }
.t-item { background: rgba(0,0,0,0.2); border: 1px solid rgba(255,255,255,0.05); padding: 1rem; border-radius: 12px; display: flex; justify-content: space-between; align-items: center; transition: all 0.3s; }
.t-item.active-lane { background: rgba(52, 211, 153, 0.1); border-color: rgba(52, 211, 153, 0.3); box-shadow: 0 0 20px rgba(52, 211, 153, 0.1); }
.t-head { font-weight: 700; letter-spacing: 1px; color: #cbd5e1; }
.t-item.active-lane .t-head { color: var(--neon-green); }
.t-data { font-family: monospace; font-size: 1.1rem; }
.t-data span { color: #475569; margin: 0 0.5rem; }