/* ================= ROOT & BASE ================= */

:root {
  --accent-blue: #4382c1;
  --bg-dark: #020611;
  --text-muted: #9aa4c7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg-dark);
  color: white;
  overflow-x: hidden;
}

/* ================= NAVBAR ================= */

nav {
  position: fixed;
  top: 0;
  width: 100%;
  height: 72px;
  padding: 18px 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 2000;
  background: var(--bg-dark);
  border-bottom: 1px solid #1a1f2e;
}

.logo {
  font-size: 1.2rem;
  letter-spacing: 3px;
  font-weight: 600;
}

.logo strong {
  color: var(--accent-blue);
}

.nav-links a {
  color: white;
  text-decoration: none;
  margin: 0 20px;
  font-size: 0.85rem;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  transform: translateX(-50%);
  transition: 0.3s;
  opacity: 0;
}

.nav-links a:hover::after {
  width: 120%;
  opacity: 1;
}

/* ================= CONTAINER ================= */

.container {
  margin-top: 72px;
}

/* ================= SECTIONS ================= */

.section {
  background: var(--bg-dark);
  position: relative;
}

/* ================= MAP SECTION ================= */

.section-map {
  position: relative;
  z-index: 5;
}

#map {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

/* Map controls */

.map-controls {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 1500;
  background: white;
  padding: 8px;
  border-radius: 8px;
  width: 240px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.25);
}

.map-controls input {
  width: 100%;
  margin-bottom: 8px;
  padding: 6px;
}

.btn-map-primary,
.btn-map-secondary {
  width: 100%;
  padding: 8px;
  border: none;
  color: white;
  cursor: pointer;
  margin-bottom: 6px;
}

.btn-map-primary { background: #2c7be5; }
.btn-map-secondary { background: #1b5e20; }

/* ================= INPUT + ESTIMATION ================= */

.section-input {
  padding: 30px;
}

.section-input input {
  width: 100%;
  padding: 8px;
  margin: 6px 0 12px;
}

.btn-form {
  width: 100%;
  padding: 10px;
  background: #2c7be5;
  border: none;
  color: white;
  cursor: pointer;
}

/* ================= ENERGY + ENVIRONMENT ================= */

.section-energy {
  padding: 30px 60px;
}

.section-energy h3 {
  color: #2c7be5;
}

.section-energy p {
  font-size: 18px;
  margin: 6px 0;
}

.note {
  font-size: 14px;
  color: #777;
}

/* ================= TOGGLE ================= */

.toggle-box {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.switch {
  position: relative;
  width: 46px;
  height: 24px;
}

.switch input {
  display: none;
}

.slider {
  position: absolute;
  inset: 0;
  background: #2b2f42;
  border-radius: 30px;
}

.slider::before {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  background: white;
  border-radius: 50%;
  top: 3px;
  left: 3px;
  transition: transform 0.3s ease;
}

.switch input:checked + .slider {
  background: var(--accent-blue);
}

.switch input:checked + .slider::before {
  transform: translateX(22px);
}

/* ================= DESKTOP LAYOUT ================= */

@media (min-width: 769px) {

  .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .section-map {
    grid-column: 1;
    height: calc(100vh - 72px);
  }

  .section-input {
    grid-column: 2;
    min-height: calc(100vh - 72px);
  }

  .section-energy {
    grid-column: 1 / span 2;
  }

  /* Desktop scroll hint (end of section 2) */
  .section-input::after {
    content: "↓ Scroll to see Energy Generation & Environmental Impact";
    display: block;
    margin-top: 30px;
    padding-top: 18px;
    text-align: center;
    font-size: 14px;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    border-top: 1px dashed rgba(255,255,255,0.2);
    animation: desktopHintFade 2.2s ease-in-out infinite;
  }
}

/* ================= MOBILE LAYOUT ================= */

@media (max-width: 768px) {

  .container {
    display: flex;
    flex-direction: column;
  }

  /* Map = 2/3 screen */
  .section-map {
    height: 66.666vh;
  }

  #map {
    height: 100%;
    width: 100vw;
  }

  .section-input,
  .section-energy {
    padding: 24px 20px;
  }

  /* Mobile scroll hint on map */
  #map::after {
    content: "Scroll ↓ for Estimation";
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 14px;
    font-size: 14px;
    letter-spacing: 0.5px;
    color: white;
    background: rgba(0,0,0,0.55);
    backdrop-filter: blur(6px);
    border-radius: 20px;
    z-index: 9999;
    pointer-events: none;
    animation: floatHint 1.6s ease-in-out infinite;
  }
}

/* ================= ANIMATIONS ================= */

@keyframes floatHint {
  0%   { transform: translate(-50%, 0); opacity: 0.6; }
  50%  { transform: translate(-50%, 6px); opacity: 1; }
  100% { transform: translate(-50%, 0); opacity: 0.6; }
}

@keyframes desktopHintFade {
  0%   { opacity: 0.4; }
  50%  { opacity: 1; }
  100% { opacity: 0.4; }
}