:root {
  --bg-day: linear-gradient(135deg, #a1c4fd 0%, #c2e9fb 100%);
  --bg-night: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
  --card-bg: rgba(255, 255, 255, 0.25);
  --card-bg-dark: rgba(0, 0, 0, 0.35);
  --accent: #2563eb;
  --glass-blur: 16px;
  --radius: 18px;
  --text: #0b1220;
  --text-light: #e6eef6;
  --shine: linear-gradient(120deg, rgba(255,255,255,0.15), rgba(255,255,255,0));
  --transition-fast: 0.3s ease;
  --transition-slow: 1s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

html, body {
  height: 100%;
  overflow-x: hidden;
}

body {
  line-height: 1.3;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* === APP === */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 30px 16px;
  background-size: 200% 200%;
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* day / night dengan transisi halus */
.app.day {
  background: var(--bg-day);
  color: var(--text);
}
.app.night {
  background: var(--bg-night);
  color: var(--text-light);
}

/* === HEADER === */
.header {
  width: 100%;
  max-width: 900px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  animation: slideDown 0.8s ease;
}

.title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

/* Search bar */
.search {
  display: flex;
  gap: 8px;
  align-items: center;
}

.search input {
  padding: 10px 14px;
  border-radius: 12px;
  border: none;
  outline: none;
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(4px);
  transition: all var(--transition-fast);
}

.search input:focus {
  background: rgba(255, 255, 255, 0.9);
  transform: scale(1.03);
}

.app.night .search input {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-light);
}

.search button {
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: white;
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 10px rgba(37,99,235,0.4);
}

.search button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(37,99,235,0.5);
}

#geoBtn {
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.1);
  color: inherit;
  font-size: 1.2rem;
  padding: 8px 10px;
  border-radius: 10px;
  transition: all var(--transition-fast);
}

#geoBtn:hover {
  background: rgba(255,255,255,0.15);
  transform: scale(1.1);
}

.app.night #geoBtn {
  border-color: rgba(255,255,255,0.2);
}

/* === CARD === */
.card {
  width: 100%;
  max-width: 900px;
  border-radius: var(--radius);
  padding: 22px;
  backdrop-filter: blur(var(--glass-blur));
  background: var(--card-bg);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  animation: fadeIn 1s ease;
  position: relative;
  overflow: hidden;
  transition: background var(--transition-slow), color var(--transition-slow);
}

.app.day .card {
  background: var(--card-bg);
  color: var(--text);
}
.app.night .card {
  background: var(--card-bg-dark);
  color: var(--text-light);
}

/* efek glass shimmer */
.card::before {
  content: "";
  position: absolute;
  top: 0; left: -50%;
  width: 200%; height: 100%;
  background: var(--shine);
  transform: skewX(-20deg);
  animation: shine 6s infinite linear;
  pointer-events: none;
}

@keyframes shine {
  0% { left: -50%; }
  100% { left: 150%; }
}

/* === WEATHER SECTION === */
.weather {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  opacity: 0;
  animation: slideUp 1s ease forwards 0.2s;
}

.left {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 50%;
}

.right {
  width: 50%;
}

#icon {
  width: 120px;
  height: 120px;
  animation: floatIcon 3s ease-in-out infinite;
}

@keyframes floatIcon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.temp {
  font-size: 3rem;
  font-weight: 700;
  margin-top: 6px;
  letter-spacing: 1px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.desc {
  font-size: 1.05rem;
  text-transform: capitalize;
  margin-top: 6px;
  opacity: 0.9;
}

.location {
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.details {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.details li {
  font-size: 0.95rem;
  opacity: 0.9;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.details li:hover {
  transform: scale(1.05);
  opacity: 1;
}

/* === ANIMASI KEYFRAMES === */
@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}
@keyframes slideUp {
  from {opacity: 0; transform: translateY(30px);}
  to {opacity: 1; transform: translateY(0);}
}
@keyframes slideDown {
  from {opacity: 0; transform: translateY(-20px);}
  to {opacity: 1; transform: translateY(0);}
}

/* === ERROR & FOOTER === */
.error {
  color: #ef4444;
  text-align: center;
  padding: 12px;
  margin-top: 10px;
  font-weight: 600;
  animation: fadeIn 0.6s ease;
}

.footer {
  margin-top: 30px;
  padding: 16px 24px;
  border-radius: var(--radius);
  backdrop-filter: blur(var(--glass-blur));
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-light);
  font-size: 0.9rem;
  text-align: center;
  box-shadow: 0 8px 25px rgba(0,0,0,0.2);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.footer::before {
  content: "";
  position: absolute;
  top: 0; left: -50%;
  width: 200%; height: 100%;
  background: var(--shine);
  transform: skewX(-20deg);
  animation: shine 6s infinite linear;
  pointer-events: none;
}

.footer:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 35px rgba(0,0,0,0.25);
  background: rgba(255, 255, 255, 0.25);
}

.footer a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: #1e40af; 
  text-decoration: underline;
}

/* responsive */
@media (max-width: 700px) {
  .footer {
    font-size: 0.85rem;
    padding: 12px 16px;
  }
}

/* === RESPONSIVE === */
@media (max-width: 700px) {
  .weather {
    flex-direction: column;
    align-items: center;
  }
  .left, .right {
    width: 100%;
    text-align: center;
  }
  .details {
    grid-template-columns: 1fr;
  }
}