:root {
    --primary-bg: #0f172a;
    --accent-blue: #38bdf8;
    --accent-purple: #818cf8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --error-red: #f87171;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 30%, rgba(56, 189, 248, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(129, 140, 248, 0.15) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

.app-container {
    width: 100%;
    max-width: 480px;
    padding: 2rem;
    animation: fadeIn 0.8s ease-out;
}

.glass-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 0.5rem;
}

.search-section {
    margin-bottom: 2rem;
}

.search-box {
    display: flex;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 0.5rem;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.search-box:focus-within {
    border-color: var(--accent-blue);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.2);
}

input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 0.8rem 1rem;
    font-size: 1rem;
    outline: none;
}

button {
    background: var(--accent-blue);
    border: none;
    border-radius: 12px;
    width: 44px;
    height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary-bg);
    cursor: pointer;
    transition: transform 0.2s ease;
}

button:hover {
    transform: scale(1.05);
}

button svg {
    width: 20px;
    height: 20px;
}

.unit-toggle {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 1.5rem;
    gap: 1rem;
}

.unit-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 20px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--glass-border);
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--accent-purple);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.slider.round {
  border-radius: 20px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Weather Card */
.weather-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.location h2 {
    font-size: 2rem;
    margin-bottom: 0.2rem;
}

#country-code {
    background: var(--accent-purple);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
}

.temp-container {
    margin: 1.5rem 0;
    font-size: 5rem;
    font-weight: 700;
}

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

.weather-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-transform: capitalize;
}

.weather-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    text-align: left;
}

.metric-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
}

.metric-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-value {
    font-size: 1.1rem;
    font-weight: 600;
}

/* Utils */
.hidden {
    display: none !important;
    opacity: 0;
}

.loader {
    width: 40px;
    height: 40px;
    border: 3px solid var(--glass-border);
    border-radius: 50%;
    border-top-color: var(--accent-blue);
    margin: 2rem auto;
    animation: spin 1s linear infinite;
}

.error-msg {
    color: var(--error-red);
    text-align: center;
    margin: 1rem 0;
    font-size: 0.9rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.footer {
    text-align: center;
    margin-top: 3rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}