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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #050816;
  font-family: "DM Sans", sans-serif;
  color: #e2e8f0;
  -webkit-font-smoothing: antialiased;
}

/* ── Canvas ──────────────────────────────────────────────── */
#terrain-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Hero Overlay ────────────────────────────────────────── */
.hero-overlay {
  position: fixed;
  top: clamp(1.2rem, 4vw, 2.4rem);
  left: clamp(1.2rem, 4vw, 2.4rem);
  pointer-events: none;
  z-index: 10;
  max-width: 28rem;
}

.eyebrow {
  font-family: "DM Sans", sans-serif;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(210, 180, 131, 0.7);
  margin-bottom: 0.5rem;
}

.hero-overlay h1 {
  font-family: "Syne", sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.05;
  color: #f1f5f9;
  text-shadow: 0 2px 30px rgba(10, 22, 40, 0.6);
}

.subtitle {
  font-size: 0.92rem;
  font-weight: 300;
  color: rgba(226, 232, 240, 0.45);
  margin-top: 0.6rem;
  font-style: italic;
}

/* ── Control Panel ───────────────────────────────────────── */
.control-panel {
  position: fixed;
  top: clamp(1.2rem, 4vw, 2.4rem);
  right: clamp(1.2rem, 4vw, 2.4rem);
  width: min(100% - 2.4rem, 18rem);
  padding: 1.4rem 1.5rem 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1.4rem;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)),
    rgba(7, 14, 31, 0.72);
  backdrop-filter: blur(28px) saturate(150%);
  -webkit-backdrop-filter: blur(28px) saturate(150%);
  box-shadow:
    0 1.4rem 3.6rem rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  z-index: 20;
}

.panel-title {
  font-family: "Syne", sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.5);
  margin-bottom: 1.1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

/* ── Control Group ───────────────────────────────────────── */
.control-group {
  margin-bottom: 0.85rem;
}

.control-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.label-text {
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(226, 232, 240, 0.6);
}

.control-label output {
  font-size: 0.74rem;
  font-weight: 500;
  color: rgba(212, 180, 131, 0.85);
  font-variant-numeric: tabular-nums;
  min-width: 3rem;
  text-align: right;
}

/* ── Seed Input ──────────────────────────────────────────── */
.seed-input {
  width: 100%;
  padding: 0.45rem 0.7rem;
  margin-top: 0.15rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0.6rem;
  background: rgba(255, 255, 255, 0.04);
  color: #e2e8f0;
  font-family: "DM Sans", sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.seed-input:focus {
  border-color: rgba(212, 180, 131, 0.4);
  box-shadow: 0 0 0 3px rgba(212, 180, 131, 0.08);
}

/* ── Range Slider ────────────────────────────────────────── */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #f0dcc0, #d4b483);
  border: 2px solid rgba(7, 14, 31, 0.6);
  box-shadow:
    0 0 8px rgba(212, 180, 131, 0.35),
    0 2px 6px rgba(0, 0, 0, 0.3);
  cursor: grab;
  transition: box-shadow 0.2s, transform 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow:
    0 0 14px rgba(212, 180, 131, 0.5),
    0 2px 8px rgba(0, 0, 0, 0.35);
  transform: scale(1.15);
}

input[type="range"]::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.05);
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #f0dcc0, #d4b483);
  border: 2px solid rgba(7, 14, 31, 0.6);
  box-shadow:
    0 0 8px rgba(212, 180, 131, 0.35),
    0 2px 6px rgba(0, 0, 0, 0.3);
  cursor: grab;
}

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.08);
}

/* ── Panel Buttons ───────────────────────────────────────── */
.panel-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 0.8rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.btn-regenerate {
  flex: 1;
  padding: 0.55rem 0;
  border: none;
  border-radius: 0.7rem;
  background: linear-gradient(135deg, #d4b483, #a88b5e);
  color: #0a1628;
  font-family: "DM Sans", sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
}

.btn-regenerate:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(212, 180, 131, 0.3);
}

.btn-regenerate:active {
  transform: translateY(0);
}

.btn-camera {
  padding: 0.55rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.7rem;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(226, 232, 240, 0.7);
  font-family: "DM Sans", sans-serif;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  white-space: nowrap;
}

.btn-camera:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
  color: #e2e8f0;
}

/* ── Loading Overlay ─────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #050816;
  transition: opacity 0.8s ease, visibility 0.8s;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-text {
  font-family: "Syne", sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(212, 180, 131, 0.6);
  animation: pulse-load 1.6s ease-in-out infinite;
}

@keyframes pulse-load {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-overlay {
    max-width: 20rem;
  }

  .control-panel {
    width: min(100% - 1.6rem, 16rem);
  }
}

@media (max-width: 640px) {
  .hero-overlay {
    top: auto;
    bottom: auto;
    left: 1rem;
    top: 1rem;
    max-width: 60%;
  }

  .hero-overlay h1 {
    font-size: 1.5rem;
  }

  .subtitle {
    display: none;
  }

  .control-panel {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: 55vh;
    overflow-y: auto;
    border-radius: 1.4rem 1.4rem 0 0;
    padding: 0.8rem 1.2rem 1.2rem;
    transform: translateY(calc(100% - 3.2rem));
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .control-panel.expanded {
    transform: translateY(0);
  }

  .control-panel::before {
    content: "";
    display: block;
    width: 2.4rem;
    height: 0.22rem;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.2);
    margin: 0 auto 0.6rem;
    cursor: grab;
  }
}