* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
} 

:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-2: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --danger: #ef4444;
    --border: #334155;
    --shadow: rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    color: var(--text);
    transition: background 0.8s ease;
}

/* Dynamic backgrounds */
body[data-weather="clear"]       { background: linear-gradient(135deg, #0369a1 0%, #38bdf8 50%, #7dd3fc 100%); }
body[data-weather="clouds"]      { background: linear-gradient(135deg, #334155 0%, #64748b 50%, #94a3b8 100%); }
body[data-weather="rain"],
body[data-weather="drizzle"]     { background: linear-gradient(135deg, #1e293b 0%, #475569 50%, #64748b 100%); }
body[data-weather="thunderstorm"]{ background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%); }
body[data-weather="snow"]        { background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 50%, #94a3b8 100%); }
body[data-weather="mist"],
body[data-weather="fog"],
body[data-weather="haze"]        { background: linear-gradient(135deg, #475569 0%, #94a3b8 50%, #cbd5e1 100%); }

.app {
    width: 100%;
    max-width: 440px;
}

.app-header {
    text-align: center;
    margin-bottom: 20px;
}
.app-header h1 {
    font-size: 2rem;
    color: white;
}
.accent { color: var(--accent); }

/* Search bar */
.search-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}
#cityInput {
    flex: 1;
    padding: 14px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}
#cityInput:focus { border-color: var(--accent); }
#cityInput::placeholder { color: var(--text-muted); } 

.btn-search {
    padding: 0 18px;
    background: var(--accent);
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}
.btn-search:hover  { background: var(--accent-hover); }
.btn-search:active { transform: scale(0.95); }

/* Loader */
.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 40px;
    color: var(--text-muted);
}
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--surface-2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error */
.error-box {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid var(--danger);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    margin-bottom: 16px;
    animation: fadeIn 0.3s ease;
}
.error-icon { font-size: 2rem; display: block; margin-bottom: 8px; }
.error-box p { color: var(--danger); }

/* Weather card */
.weather-card {
    background: rgba(30, 41, 59, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px 24px;
    text-align: center;
    animation: fadeIn 0.4s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.datetime {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.city-name h2 {
    font-size: 1.5rem;
    display: inline;
}
.city-name #country {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-left: 6px;
}

.weather-icon-wrapper {
    margin: 10px 0;
}
.weather-icon-wrapper img {
    width: 100px;
    height: 100px;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3));
    animation: float 2.5s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-8px); }
}

.temperature {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 4px;
}
.unit {
    font-size: 1.6rem;
    font-weight: 400;
    color: var(--text-muted);
}

.condition {
    text-transform: capitalize;
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 20px;
}

.details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.detail-card {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(51, 65, 85, 0.6);
    border-radius: 12px;
    padding: 12px;
}
.detail-icon { font-size: 1.5rem; }
.detail-value {
    font-weight: 700;
    font-size: 1rem;
}
.detail-label {
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Hint */
.hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 16px;
}

/* Utility */
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 460px) {
    .weather-card { padding: 20px 16px; }
    .temperature { font-size: 2.8rem; }
    .details-grid { gap: 8px; }
    .detail-card { padding: 10px 8px; gap: 8px; }
}