:root {
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e1b4b;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --error-color: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    transition: background 1.5s ease;
}

.app-container {
    width: 100%;
    max-width: 900px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    text-align: center;
}

header h1 {
    font-weight: 700;
    font-size: 2.5rem;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#search-form {
    display: flex;
    width: 100%;
    max-width: 500px;
    gap: 0.5rem;
}

#search-input {
    flex: 1;
    padding: 0.8rem 1.2rem;
    border-radius: 9999px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

#search-input::placeholder {
    color: var(--text-secondary);
}

#search-input:focus {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.3);
}

button {
    padding: 0.8rem 1.5rem;
    border-radius: 9999px;
    border: none;
    background: var(--accent-color);
    color: #0f172a;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, background 0.3s;
}

button:hover {
    background: #7dd3fc;
    transform: translateY(-2px);
}

.hidden {
    display: none !important;
}

#loading, #error {
    text-align: center;
    font-size: 1.2rem;
    padding: 2rem;
}

#error {
    color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

#weather-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    animation: fadeIn 0.5s ease;
}

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

.main-card {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.main-card::before {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(56,189,248,0.1) 0%, transparent 50%);
    z-index: -1;
}

#location-name {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.temperature-display {
    font-size: 6rem;
    font-weight: 700;
    line-height: 1;
    margin: 1rem 0;
}

.condition {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-color);
}

.tomorrow-summary {
    margin-top: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
}

.tomorrow-summary h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
}

.detail-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border-radius: 16px;
    transition: transform 0.3s ease;
}

.detail-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
}

.detail-value {
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
}

.timeline-container {
    padding: 1.5rem;
}

.timeline-container h3 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.timeline {
    display: flex;
    overflow-x: auto;
    gap: 1rem;
    padding-bottom: 1rem;
    scrollbar-width: thin;
    scrollbar-color: var(--glass-border) transparent;
    scroll-behavior: smooth;
}

.timeline::-webkit-scrollbar {
    height: 6px;
}

.timeline::-webkit-scrollbar-thumb {
    background-color: var(--glass-border);
    border-radius: 9999px;
}

.hourly-item {
    min-width: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 0.5rem;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.hourly-item:hover {
    background: rgba(0, 0, 0, 0.4);
}

.hourly-item.now {
    border-color: var(--accent-color);
    background: rgba(56, 189, 248, 0.1);
    transform: scale(1.05);
}

.hourly-time {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hourly-temp {
    font-size: 1.1rem;
    font-weight: 600;
}

.hourly-icon {
    font-size: 1.5rem;
}

@media (max-width: 600px) {
    .app-container { padding: 1rem; }
    .temperature-display { font-size: 4rem; }
    .details-grid { grid-template-columns: repeat(2, 1fr); }
    .glass-panel { padding: 1.5rem; }
}

/* ============================================
   DYNAMIC BACKGROUND THEMES
   ============================================ */
body.theme-clear-day {
    background: linear-gradient(160deg, #1a6faf 0%, #2196f3 40%, #87ceeb 100%);
}
body.theme-clear-night {
    background: linear-gradient(160deg, #000010 0%, #0d1b4b 50%, #1a1a6e 100%);
}
body.theme-partly-cloudy-day {
    background: linear-gradient(160deg, #1a6faf 0%, #5a9fd4 50%, #b0c8e8 100%);
}
body.theme-partly-cloudy-night {
    background: linear-gradient(160deg, #0d1b4b 0%, #1f2e5a 50%, #2a3b6e 100%);
}
body.theme-cloudy {
    background: linear-gradient(160deg, #2d3a4a 0%, #4a5568 50%, #718096 100%);
}
body.theme-rain {
    background: linear-gradient(160deg, #0f1f35 0%, #1a3353 40%, #2c4a6b 100%);
}
body.theme-snow {
    background: linear-gradient(160deg, #cdd9e5 0%, #9bb5cc 50%, #6a93b0 100%);
}
body.theme-fog {
    background: linear-gradient(160deg, #4a4e5a 0%, #6b7280 50%, #9ca3af 100%);
}
body.theme-wind {
    background: linear-gradient(160deg, #1a3a5c 0%, #2d5a7a 50%, #4a7a9b 100%);
}

/* FIX #1: Text contrast on cloudy backgrounds (Issue #3) */
body.theme-cloudy,
body.theme-partly-cloudy-day,
body.theme-partly-cloudy-night,
body.theme-fog {
    --text-secondary: #f8fafc;
}

/* ============================================
   WEATHER ANIMATION CONTAINER
   ============================================ */
#weather-animation-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}
.app-container {
    position: relative;
    z-index: 1;
}

/* FIX #3: RAIN - more visible rain drops */
.rain-drop {
    position: absolute;
    top: -60px;
    width: 2px;
    background: linear-gradient(to bottom, transparent, rgba(180, 225, 255, 0.85));
    border-radius: 9999px;
    animation: fall-rain linear infinite;
    transform-origin: top center;
}
@keyframes fall-rain {
    0%   { transform: translateY(0) rotate(20deg); opacity: 0; }
    8%   { opacity: 1; }
    92%  { opacity: 0.9; }
    100% { transform: translateY(110vh) rotate(20deg); opacity: 0; }
}

/* --- SNOW --- */
.snow-flake {
    position: absolute;
    top: -20px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.85);
    animation: fall-snow linear infinite;
}
@keyframes fall-snow {
    0%   { transform: translateY(0) translateX(0); opacity: 0; }
    10%  { opacity: 1; }
    50%  { transform: translateY(50vh) translateX(30px); }
    90%  { opacity: 0.8; }
    100% { transform: translateY(110vh) translateX(-20px); opacity: 0; }
}

/* FIX #2: CLOUDS - visible shaped clouds that drift across screen */
.cloud-particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.18);
    border-radius: 50%;
    animation: drift-cloud linear infinite;
    filter: blur(8px);
    box-shadow:
        40px 15px 0 10px rgba(255,255,255,0.15),
        -40px 15px 0 5px rgba(255,255,255,0.12),
        80px 5px 0 -5px rgba(255,255,255,0.10);
}
@keyframes drift-cloud {
    0%   { transform: translateX(-30vw); opacity: 0; }
    8%   { opacity: 1; }
    92%  { opacity: 0.85; }
    100% { transform: translateX(115vw); opacity: 0; }
}

/* --- FOG --- */
.fog-strip {
    position: absolute;
    left: -20%;
    width: 140%;
    background: rgba(200, 210, 220, 0.06);
    filter: blur(30px);
    animation: drift-fog ease-in-out infinite alternate;
    border-radius: 50%;
}
@keyframes drift-fog {
    0%   { transform: translateX(0); }
    100% { transform: translateX(10%); }
}

/* --- STARS (clear night) --- */
.star-particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: white;
    border-radius: 50%;
    animation: twinkle ease-in-out infinite alternate;
}
@keyframes twinkle {
    0%   { opacity: 0.1; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.5); }
}

/* FIX #4: SUN - moving sun disc with glow and orbit rings */
.sun-disc {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, #fff9c4 0%, #ffd54f 40%, rgba(255, 193, 7, 0) 75%);
    animation: move-sun ease-in-out infinite alternate;
    box-shadow: 0 0 60px 20px rgba(255, 220, 50, 0.4), 0 0 120px 60px rgba(255, 200, 0, 0.2);
}
@keyframes move-sun {
    0%   { transform: translate(0px, 0px) scale(1); }
    50%  { transform: translate(-25px, 15px) scale(1.05); }
    100% { transform: translate(10px, -20px) scale(0.95); }
}

.sun-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(255, 220, 50, 0.15);
    animation: expand-ring ease-out infinite;
}
@keyframes expand-ring {
    0%   { transform: scale(1); opacity: 0.6; }
    100% { transform: scale(2.5); opacity: 0; }
}