:root {
    --font-family: 'Poppins', sans-serif;
    --transition-speed: 0.3s;
    --backdrop-blur: 20px;

    /* Light Theme Palette */
    --bg-light: #f3f4f6;
    --card-bg-light: rgba(255, 255, 255, 0.6);
    --text-primary-light: #111827;
    --text-secondary-light: #4b5563;
    --shadow-color-light: rgba(40, 50, 70, 0.1);
    --border-color-light: rgba(0, 0, 0, 0.1);
    --accent-color-light: #3b82f6;

    /* Dark Theme Palette */
    --bg-dark: #0f172a;
    --card-bg-dark: rgba(30, 41, 59, 0.5);
    --text-primary-dark: #f1f5f9;
    --text-secondary-dark: #94a3b8;
    --shadow-color-dark: rgba(0, 0, 0, 0.2);
    --border-color-dark: rgba(255, 255, 255, 0.15);
    --accent-color-dark: #60a5fa;
}

html {
    --bg: var(--bg-light);
    --card-bg: var(--card-bg-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --shadow-color: var(--shadow-color-light);
    --border-color: var(--border-color-light);
    --accent-color: var(--accent-color-light);
}

html.dark-theme {
    --bg: var(--bg-dark);
    --card-bg: var(--card-bg-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --shadow-color: var(--shadow-color-dark);
    --border-color: var(--border-color-dark);
    --accent-color: var(--accent-color-dark);
}

body {
    font-family: var(--font-family);
    background-color: var(--bg);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 1rem;
    box-sizing: border-box;
    transition: background-color var(--transition-speed) ease;
}

.weather-app-container {
    width: 100%;
    max-width: 1300px;
    position: relative;
    z-index: 1;
}

.weather-app {
    display: grid;
    grid-template-columns: 1fr;
    background: var(--card-bg);
    border-radius: 2rem;
    box-shadow: 0 25px 50px -12px var(--shadow-color);
    border: 1.5px solid var(--border-color);
    /* PERFORMANCE: backdrop-filter is very slow on mobile. Replaced with simple transparency. */
    /* backdrop-filter: blur(var(--backdrop-blur)); */
    /* -webkit-backdrop-filter: blur(var(--backdrop-blur)); */
    overflow: hidden;
    opacity: 0;
    transform: scale(0.98);
    animation: fadeIn 0.6s 0.2s forwards ease-out;
    transition: background var(--transition-speed) ease, border var(--transition-speed) ease;
}

@keyframes fadeIn {
    to { opacity: 1; transform: scale(1); }
}

/* --- Main Content Panel (Mobile-First) --- */
.main-panel {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2.25rem; /* Increased this value for more space */
    flex-shrink: 0;
}

.search-container {
    position: relative;
    flex-grow: 1;
    max-width: 230px; /* This limits the width */
}

.search-container > .fa-search {
    position: absolute;
    top: 50%;
    left: 1.1rem;
    transform: translateY(-50%);
    color: var(--text-secondary);
    z-index: 1;
}

#search-input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 3rem;
    font-size: 1rem;
    border: 1px solid transparent;
    border-radius: 2rem;
    background-color: rgba(128, 128, 128, 0.1);
    color: var(--text-primary);
    outline: none;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

#search-input::placeholder { color: var(--text-secondary); }
#search-input:focus {
    box-shadow: 0 4px 12px var(--shadow-color);
    border-color: var(--border-color);
    background-color: var(--card-bg);
}

#search-results {
    position: absolute; width: 100%; top: 115%; left: 0;
    background-color: var(--card-bg); border: 1px solid var(--border-color);
    border-radius: 1.25rem; overflow: hidden; z-index: 10;
    box-shadow: 0 8px 24px var(--shadow-color);
    /* backdrop-filter: blur(var(--backdrop-blur)); */
}
#search-results div { padding: 0.9rem 1.25rem; cursor: pointer; transition: background-color 0.2s ease; }
#search-results div:hover { background-color: rgba(128, 128, 128, 0.1); }

.header-controls { display: flex; align-items: center; gap: 0.5rem; }
.icon-button {
    display: flex; align-items: center; justify-content: center;
    width: 44px; height: 44px;
    background-color: rgba(128, 128, 128, 0.1);
    border: 1px solid transparent; border-radius: 50%; cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: all var(--transition-speed) ease;
    flex-shrink: 0; font-size: 1rem; color: var(--text-primary);
}
.icon-button:hover {
    transform: scale(1.1) rotate(10deg);
    box-shadow: 0 6px 16px var(--shadow-color);
    background-color: var(--card-bg);
}

.theme-toggle .fa-sun { display: none; } .theme-toggle .fa-moon { display: block; }
html.dark-theme .theme-toggle .fa-sun { display: block; } html.dark-theme .theme-toggle .fa-moon { display: none; }

.current-weather-display {
    text-align: center;
    flex-grow: 1; display: flex; flex-direction: column;
    justify-content: center; padding: 2rem 0;
}
.current-weather-display h1 { font-size: 1.8rem; font-weight: 600; margin: 0; }
.current-weather-display p { color: var(--text-secondary); margin: 0.25rem 0; font-size: 0.9rem; }
.current-weather-main { display: flex; align-items: center; justify-content: center; margin: 1rem 0; gap: 1rem; }
.current-weather-display #weather-icon { font-size: 5.5rem; line-height: 1; text-shadow: 0 8px 25px var(--shadow-color); }
.current-weather-display #temperature { font-size: 5.5rem; font-weight: 700; line-height: 1; color: var(--text-primary); margin: 0; }
.current-weather-display #weather-description { font-size: 1.1rem; text-transform: capitalize; margin-top: 0.5rem; font-weight: 500; }

/* --- Side Panel (Mobile-First) --- */
.side-panel {
    background-color: rgba(0, 0, 0, 0.03);
    padding: 1.25rem; display: flex;
    flex-direction: column; gap: 1.5rem;
}
html.dark-theme .side-panel { background-color: rgba(0, 0, 0, 0.15); }

.mobile-nav { display: flex; gap: 0.5rem; margin-bottom: 0.5rem; }
.nav-button {
    flex-grow: 1; padding: 0.75rem; border: 1px solid transparent; border-radius: 2rem;
    background: transparent; color: var(--text-secondary);
    font-family: var(--font-family); font-size: 0.9rem; font-weight: 600;
    cursor: pointer; transition: all var(--transition-speed) ease;
}
.nav-button:hover { background-color: var(--card-bg); color: var(--text-primary); }
.nav-button.active { background: var(--card-bg); color: var(--text-primary); box-shadow: 0 4px 10px var(--shadow-color); border-color: var(--border-color); }

.side-panel > .card { display: none; }
.side-panel > .card.active { display: block; animation: cardFadeIn 0.5s ease; }
@keyframes cardFadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.card-header { font-size: 1.1rem; font-weight: 600; margin-bottom: 1.25rem; color: var(--text-primary); }
.details-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

.detail-item {
    background-color: transparent; padding: 1rem; border-radius: 1rem;
    border: 1px solid transparent; display: flex;
    align-items: center; gap: 0.75rem;
    transition: all var(--transition-speed) ease;
}
.detail-item:hover { transform: translateY(-4px); box-shadow: 0 8px 20px var(--shadow-color); border-color: var(--border-color); background-color: rgba(128, 128, 128, 0.05); }
.detail-item i { font-size: 1.5rem; color: var(--accent-color); width: 32px; text-align: center; }
.detail-item p { margin: 0; }
.detail-item p:first-of-type { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 0.2rem; }
.detail-item p:last-of-type { font-weight: 600; font-size: 1.05rem; }

#aqi-value { display: flex; align-items: center; gap: 0.5rem; }
.aqi-indicator { width: 10px; height: 10px; border-radius: 50%; }
.aqi-good { background-color: #28a745; } .aqi-moderate { background-color: #ffc107; }
.aqi-unhealthy-sensitive { background-color: #fd7e14; } .aqi-unhealthy { background-color: #dc3545; }
.aqi-very-unhealthy { background-color: #8f3d97; } .aqi-hazardous { background-color: #79252c; }

.hourly-forecast-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.hourly-item {
    display: grid;
    grid-template-columns: 1.5fr auto 1fr 1fr;
    align-items: center;
    gap: 1rem;
    padding: 0.9rem 1rem;
    border-radius: 1rem;
    transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
}

.hourly-item:hover {
    background-color: rgba(128, 128, 128, 0.05);
    transform: translateX(5px);
}

.hourly-item .time { font-size: 0.9rem; font-weight: 600; }
.hourly-item .icon { font-size: 1.8rem; }
.hourly-item .temp { font-weight: 600; font-size: 1rem; text-align: right; }
.hourly-item .precip { font-size: 0.75rem; color: var(--accent-color); display: flex; align-items: center; gap: 3px; justify-content: flex-end; }

.daily-forecast-container { display: flex; flex-direction: column; gap: 0.75rem; }
.daily-item {
    display: grid; grid-template-columns: 1.2fr auto 1fr; align-items: center;
    gap: 1rem; padding: 0.9rem 1rem;
    border-radius: 1rem;
    transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease;
}
.daily-item:hover { background-color: rgba(128, 128, 128, 0.05); transform: translateX(5px); }
.daily-item .day { font-weight: 600; font-size: 0.95rem; } .daily-item .icon { font-size: 1.8rem; }
.daily-item .temp-range { text-align: right; font-weight: 500; font-size: 0.95rem; }
.daily-item .temp-range .low { color: var(--text-secondary); }

/* --- Utility and Loader Styles --- */
#loader { display: flex; justify-content: center; align-items: center; min-height: 80vh; }
.spinner { display: flex; gap: 8px; }
.spinner div { width: 12px; height: 12px; background: var(--text-primary); border-radius: 50%; animation: pulse 1.2s cubic-bezier(0, 0.5, 0.5, 1) infinite; }
.spinner div:nth-child(1) { animation-delay: -0.24s; }
.spinner div:nth-child(2) { animation-delay: -0.12s; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(0.9); } }
.hidden { display: none !important; }

/* --- Responsive Design for Desktop --- */
@media (min-width: 1024px) {
    body { align-items: center; padding: 1.5rem; }
    .weather-app { grid-template-columns: minmax(420px, 1fr) 1.5fr; height: 85vh; max-height: 850px; border-radius: 2.5rem;}
    .main-panel { padding: 3rem; }
    #search-input { padding: 0.9rem 1.25rem 0.9rem 3.5rem; }
    .icon-button { width: 48px; height: 48px; font-size: 1.1rem; }
    .current-weather-display #weather-icon { font-size: 8rem; }
    .current-weather-display #temperature { font-size: 8rem; }
    .current-weather-display h1 { font-size: 2.5rem; }
    .current-weather-display #weather-description { font-size: 1.5rem; margin-top: 0.75rem; }
    
    .side-panel {
        border-left: 1.5px solid var(--border-color); padding: 3rem;
        overflow-y: auto; background: transparent;
        -ms-overflow-style: none; scrollbar-width: none;
    }
    .side-panel::-webkit-scrollbar { display: none; }
    .mobile-nav { display: none; }
    .side-panel > .card { display: block; animation: none; }
    
    .card-header { font-size: 1.25rem; }
    .details-grid { gap: 1rem; }
    .detail-item { padding: 1.25rem; gap: 1rem; border-radius: 1.25rem;}
    .detail-item i { font-size: 1.75rem; width: 40px; }
    .detail-item p:first-of-type { font-size: 0.85rem; }
    .detail-item p:last-of-type { font-size: 1.15rem; }

    .hourly-forecast-container {
        display: flex;
        flex-direction: row;
        overflow-x: auto;
        gap: 0.75rem;
        padding: 0.25rem 0 1rem 0.25rem;
    }
    .hourly-forecast-container::-webkit-scrollbar { height: 6px; }
    .hourly-forecast-container::-webkit-scrollbar-thumb { background-color: var(--border-color); border-radius: 3px; }
    
    .hourly-item {
        display: flex;
        flex-direction: column;
        flex: 0 0 75px;
        gap: 0.5rem;
        padding: 0.9rem 0.5rem;
        border-radius: 1.25rem;
        border: 1px solid transparent;
        text-align: center;
        transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
        grid-template-columns: unset;
    }

    .hourly-item:hover {
        background-color: rgba(128, 128, 128, 0.05);
        border-color: var(--border-color);
        transform: translateY(-4px);
    }

    .daily-item { padding: 1rem 1.5rem; border-radius: 1.25rem; gap: 1.5rem; }
    .daily-item .day, .daily-item .temp-range { font-size: 1rem; }
    .daily-item .icon { font-size: 2rem; }
}


@keyframes animateGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes lightning-flash {
    0%, 95%, 100% { opacity: 0; }
    96% { opacity: 0.7; }
    97% { opacity: 0.3; }
    98% { opacity: 0.8; }
    99% { opacity: 0.1; }
}

.weather-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    transition: background 1.5s ease-out;
    background-size: 400% 400%;
   
}

.weather-background::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: white;
    opacity: 0;
}

/* --- Default Background --- */
.weather-background {
    background: linear-gradient(-45deg, #0f172a, #2c3e50, #34495e, #2c3e50);
}
html:not(.dark-theme) .weather-background {
    background: linear-gradient(-45deg, #e0eafc, #cfdef3, #f2f2f2, #cfdef3);
}

/* --- ☀️ CLEAR DAY (SUNNY) --- */
.weather-background.weather-clear-day {
    background: linear-gradient(-45deg, #fceabb, #f8b500, #56ccf2, #2f80ed);
}
html:not(.dark-theme) .weather-background.weather-clear-day {
    background: linear-gradient(-45deg, #fdd835, #f57c00, #81d4fa, #039be5);
}

/* --- 🌙 CLEAR NIGHT --- */
.weather-background.weather-clear-night {
    background: linear-gradient(-45deg, #0f2027, #203a43, #2c5364, #122a3a);
}
html:not(.dark-theme) .weather-background.weather-clear-night {
    background: linear-gradient(-45deg, #232a4d, #3c4a80, #5f6fad, #232a4d);
}

/* --- ☁️ CLOUDY --- */
.weather-background.weather-cloudy {
    background: linear-gradient(-45deg, #606c88, #3f4c6b, #9e9e9e, #757575);
}
html:not(.dark-theme) .weather-background.weather-cloudy {
    background: linear-gradient(-45deg, #bdc3c7, #2c3e50, #d7dde8, #757f9a);
}

/* --- 🌧️ RAIN --- */
.weather-background.weather-rain {
    background: linear-gradient(-45deg, #2c3e50, #4ca1af, #375d72, #2c3e50);
}
html:not(.dark-theme) .weather-background.weather-rain {
    background: linear-gradient(-45deg, #a7b2b9, #6c7a89, #98a6b3, #a7b2b9);
}

/* --- ⛈️ THUNDERSTORM --- */
.weather-background.weather-thunderstorm {
    background: linear-gradient(-45deg, #141e30, #243b55, #000, #16222a);
}
.weather-background.weather-thunderstorm::after {
    animation: lightning-flash 8s linear infinite;
}
html:not(.dark-theme) .weather-background.weather-thunderstorm {
    background: linear-gradient(-45deg, #373b44, #4286f4, #1c1d22, #373b44);
}

/* --- 🌨️ SNOW --- */
.weather-background.weather-snow {
    background: linear-gradient(-45deg, #e6dada, #a8c0ff, #d3e1f2, #e6dada);
}
html:not(.dark-theme) .weather-background.weather-snow {
    background: linear-gradient(-45deg, #e0eafc, #cfdef3, #fff, #cfdef3);
}

/* --- 🌫️ FOG --- */
.weather-background.weather-fog {
    background: linear-gradient(-45deg, #757f9a, #d7dde8, #b2bcc9, #757f9a);
}
html:not(.dark-theme) .weather-background.weather-fog {
    background: linear-gradient(-45deg, #cfd9df, #e2ebf0, #adb5bd, #cfd9df);
}