:root {
    --primary-color: #1e40af;
    --primary-hover: #1d4ed8;
    --primary-dark: #1e3a8a;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --secondary-light: #94a3b8;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --light-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --dark-bg: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 100%);
    --card-bg: rgba(255, 255, 255, 0.98);
    --card-bg-dark: rgba(30, 41, 59, 0.98);
    --light-text: #1e293b;
    --dark-text: #f1f5f9;
    --border-color: rgba(226, 232, 240, 0.9);
    --border-color-dark: rgba(71, 85, 105, 0.9);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.06);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 16px;
    --border-radius-lg: 20px;
    --border-radius-sm: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient(to bottom, #87CEFA, #f8fafc);
    min-height: 100vh;
    transition: background 0.5s ease;
    font-size: 16px;
    line-height: 1.6;
    color: var(--light-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}


.weather-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}


.star {
    position: absolute;
    background: white;
    border-radius: 50%;
    animation: twinkle 2s infinite alternate;
}

.star.small { width: 2px; height: 2px; }
.star.medium { width: 3px; height: 3px; }
.star.large { width: 4px; height: 4px; }

@keyframes twinkle {
    0% { opacity: 0.3; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.2); }
}


.shooting-star {
    position: absolute;
    width: 2px;
    height: 80px;
    background: linear-gradient(to bottom, transparent, white, transparent);
    animation: shoot 3s linear infinite;
    transform: rotate(45deg);
}

@keyframes shoot {
    0% {
        top: -100px;
        left: 100%;
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        top: 100%;
        left: -100px;
        opacity: 0;
    }
}


.cloud {
    position: absolute;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50px;
    animation: float 20s infinite linear;
}

.cloud:before {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50px;
}

.cloud.small {
    width: 60px;
    height: 20px;
}

.cloud.small:before {
    width: 40px;
    height: 40px;
    top: -20px;
    left: 10px;
}

.cloud.medium {
    width: 80px;
    height: 30px;
}

.cloud.medium:before {
    width: 50px;
    height: 50px;
    top: -25px;
    left: 15px;
}

.cloud.large {
    width: 100px;
    height: 40px;
}

.cloud.large:before {
    width: 60px;
    height: 60px;
    top: -30px;
    left: 20px;
}

@keyframes float {
    0% { transform: translateX(-30px); }
    50% { transform: translateX(30px); }
    100% { transform: translateX(-30px); }
}


.raindrop {
    position: absolute;
    width: 2px;
    height: 20px;
    background: linear-gradient(to bottom, transparent, #4FC3F7, transparent);
    animation: fall 1s linear infinite;
}

@keyframes fall {
    0% {
        top: -20px;
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        top: 100vh;
        opacity: 0;
    }
}


.snowflake {
    position: absolute;
    color: white;
    user-select: none;
    pointer-events: none;
    animation: snowfall 10s linear infinite;
}

@keyframes snowfall {
    0% {
        transform: translateY(-100px) rotate(0deg);
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0;
    }
}


.lightning {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    opacity: 0;
    animation: flash 0.2s ease-in-out;
}

@keyframes flash {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
}


.sun-ray {
    position: absolute;
    top: 10%;
    right: 10%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 223, 0, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}


.mist-particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    animation: drift 15s ease-in-out infinite;
}

@keyframes drift {
    0%, 100% {
        transform: translateX(0) translateY(0) scale(1);
        opacity: 0.4;
    }
    50% {
        transform: translateX(50px) translateY(-30px) scale(1.2);
        opacity: 0.7;
    }
}


.dust-particle {
    position: absolute;
    background: rgba(210, 180, 140, 0.6);
    border-radius: 50%;
    animation: swirl 8s ease-in-out infinite;
}

@keyframes swirl {
    0% {
        transform: translateX(0) translateY(0) rotate(0deg);
        opacity: 0.3;
    }
    25% {
        transform: translateX(30px) translateY(-20px) rotate(90deg);
        opacity: 0.7;
    }
    50% {
        transform: translateX(0) translateY(-40px) rotate(180deg);
        opacity: 0.5;
    }
    75% {
        transform: translateX(-30px) translateY(-20px) rotate(270deg);
        opacity: 0.7;
    }
    100% {
        transform: translateX(0) translateY(0) rotate(360deg);
        opacity: 0.3;
    }
}


.hail {
    position: absolute;
    background: radial-gradient(circle, #ffffff 30%, #e8e8e8 70%, #d0d0d0 100%);
    border-radius: 50%;
    animation: hailfall 0.8s linear infinite;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hail.small { width: 4px; height: 4px; }
.hail.medium { width: 6px; height: 6px; }
.hail.large { width: 8px; height: 8px; }

@keyframes hailfall {
    0% {
        top: -10px;
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        top: 100vh;
        opacity: 0;
    }
}


.smoke-particle {
    position: absolute;
    background: radial-gradient(circle, rgba(128, 128, 128, 0.4) 0%, transparent 70%);
    border-radius: 50%;
    animation: smoke-drift 12s ease-in-out infinite;
}

@keyframes smoke-drift {
    0% {
        transform: translateX(0) translateY(20px) scale(0.5);
        opacity: 0.6;
    }
    50% {
        transform: translateX(40px) translateY(-30px) scale(1.2);
        opacity: 0.3;
    }
    100% {
        transform: translateX(-20px) translateY(-60px) scale(0.8);
        opacity: 0;
    }
}


.tornado {
    position: absolute;
    width: 0;
    height: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-bottom: 200px solid rgba(100, 100, 100, 0.7);
    animation: tornado-spin 2s linear infinite;
    left: 50%;
    top: 60%;
    transform-origin: bottom center;
}

@keyframes tornado-spin {
    0% { transform: translateX(-50%) rotate(0deg); }
    100% { transform: translateX(-50%) rotate(360deg); }
}


.ash-particle {
    position: absolute;
    background: rgba(64, 64, 64, 0.8);
    border-radius: 50%;
    animation: ash-fall 6s ease-in-out infinite;
}

@keyframes ash-fall {
    0% {
        transform: translateY(-50px) translateX(0);
        opacity: 0;
    }
    20% { opacity: 0.8; }
    80% { opacity: 0.6; }
    100% {
        transform: translateY(100vh) translateX(50px);
        opacity: 0;
    }
}


.aurora {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(
        45deg,
        transparent 40%,
        rgba(0, 255, 150, 0.3) 50%,
        rgba(0, 150, 255, 0.3) 60%,
        transparent 70%
    );
    animation: aurora-wave 8s ease-in-out infinite;
}

@keyframes aurora-wave {
    0%, 100% {
        opacity: 0.3;
        transform: skewY(0deg);
    }
    50% {
        opacity: 0.7;
        transform: skewY(2deg);
    }
}


.fog-bank {
    position: absolute;
    bottom: 0;
    width: 200%;
    height: 40%;
    background: linear-gradient(to top, rgba(200, 200, 200, 0.8) 0%, transparent 100%);
    animation: fog-roll 20s linear infinite;
}

@keyframes fog-roll {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(0%); }
}


.wind-particle {
    position: absolute;
    width: 30px;
    height: 2px;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.6), transparent);
    animation: wind-blow 1.5s linear infinite;
}

@keyframes wind-blow {
    0% {
        left: -50px;
        opacity: 0;
    }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% {
        left: calc(100% + 50px);
        opacity: 0;
    }
}


.sleet {
    position: absolute;
    animation: sleet-fall 1.2s linear infinite;
}

.sleet.rain {
    width: 2px;
    height: 15px;
    background: linear-gradient(to bottom, transparent, #4FC3F7, transparent);
}

.sleet.ice {
    width: 3px;
    height: 3px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 0 2px rgba(0,0,0,0.3);
}

@keyframes sleet-fall {
    0% {
        top: -20px;
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        top: 100vh;
        opacity: 0;
    }
}

body.dark-mode {
    background: var(--dark-bg);
    color: var(--dark-text);
}