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

body {
    font-family: 'Arial', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.container {
    padding: 20px;
    position: relative;
    z-index: 2;
}

/* Pure HTML/CSS ski-themed background */
.bg {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

/* dark overlay to improve contrast for white text */
.bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 40%, rgba(0,0,0,0.5), rgba(0,0,0,0.18) 55%, rgba(0,0,0,0) 80%);
    pointer-events: none;
    z-index: 1;
}

/* mountains using CSS triangles */
.mountain {
    width: 0;
    height: 0;
    position: absolute;
    bottom: -20px;
    border-left: 300px solid transparent;
    border-right: 300px solid transparent;
    border-bottom: 320px solid #2f3854;
    opacity: 0.55;
    transform-origin: bottom center;
}

/* single centered mountain */
.mountain.m-front {
    left: 50%;
    transform: translateX(-50%);
    --mw: 420px;
    --mh: 460px;

    border-left: var(--mw) solid transparent;
    border-right: var(--mw) solid transparent;
    border-bottom: var(--mh) solid #3f4b6b;
    opacity: 0.95;
    bottom: calc(-1 * var(--mh) / 2);
}

/* trees made from stacked triangles */
.tree {
    width: 0;
    height: 0;
    position: absolute;
    bottom: env(safe-area-inset-bottom, 0px);
}

.tree.t1 { left: 8%; }
.tree.t2 { left: 18%; }
.tree.t3 { right: 8%; }

.tree::before, .tree::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
}

.tree::before {
    bottom: 0px;
    border-bottom: 40px solid #0b3a20;
}

.tree::after {
    bottom: 18px;
    border-left: 14px solid transparent;
    border-right: 14px solid transparent;
    border-bottom: 30px solid #0b6b31;
}
.snowflakes .flake {
    position: absolute;
    top: -10px;
    width: 6px;
    height: 6px;
    background: #fff;
    border-radius: 50%;
    opacity: 0.9;
    animation-name: fall;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

.snowflakes .f1 { left: 10%; animation-duration: 7s; animation-delay: 0s; }
.snowflakes .f2 { left: 28%; animation-duration: 10s; animation-delay: 1s; }
.snowflakes .f3 { left: 46%; animation-duration: 8s; animation-delay: 0.5s; }
.snowflakes .f4 { left: 64%; animation-duration: 9s; animation-delay: 2s; }
.snowflakes .f5 { left: 82%; animation-duration: 6s; animation-delay: 0.7s; }

@keyframes fall {
    0% { transform: translateY(-20px) translateX(0); opacity: 0.95; }
    100% { transform: translateY(110vh) translateX(20px); opacity: 0; }
}

h1 {
    font-size: 3rem;
    margin-bottom: 2rem;
    font-weight: 300;
}

.answer {
    font-size: 15rem;
    font-weight: bold;
    margin: 2rem 0;
    text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    opacity: 0.9;
}

.date-picker {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    bottom: 45px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.share-btn {
    appearance: none;
    -webkit-appearance: none;
    background: rgba(255,255,255,0.95);
    color: #222;
    border: none;
    padding: 0.55rem 0.9rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 6px 18px rgba(0,0,0,0.15);
    transition: transform .12s ease, opacity .12s ease;
}
.share-btn:active { transform: translateY(1px); }
.share-btn[disabled] { opacity: 0.6; cursor: default; }

.share-msg {
    margin-top: 6px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    font-size: 0.9rem;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}
.share-msg.hidden { display: none; }

/* Floating share button (top-right) */
.share-floating {
    position: fixed;
    top: calc(12px + env(safe-area-inset-top, 0px));
    right: calc(12px + env(safe-area-inset-right, 0px));
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.share-floating svg { display: block; }

/* position the share message near the button */
#shareMessage {
    position: fixed;
    top: calc(64px + env(safe-area-inset-top, 0px));
    right: calc(12px + env(safe-area-inset-right, 0px));
    z-index: 20;
}

@media (max-width: 480px) {
    .share-floating { width: 40px; height: 40px; }
    #shareMessage { top: calc(56px + env(safe-area-inset-top, 0px)); right: calc(8px + env(safe-area-inset-right, 0px)); }
}

/* GitHub repo link at bottom center */
.repo-link {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    z-index: 11;
    display: inline-flex;
    gap: 0.5rem;
    align-items: center;
    padding: 0.35rem 0.6rem;
    background: rgba(255,255,255,0.95);
    color: #111;
    border-radius: 8px;
    font-size: 0.85rem;
    text-decoration: none;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}
.repo-link svg { display:block; }

@media (max-width: 480px) {
    .repo-link { font-size: 0.8rem; padding: 0.3rem 0.5rem; }
}

input[type="datetime-local"] {
    padding: 0.75rem 1.5rem;
    font-size: 1.2rem;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    color: #333;
    cursor: pointer;
    font-family: 'Arial', sans-serif;
}

input[type="datetime-local"]:focus {
    outline: 3px solid rgba(255, 255, 255, 0.7);
    outline-offset: 2px;
}

.countdown {
    font-size: 2rem;
    font-weight: 300;
    margin-top: 1rem;
    opacity: 0.95;
}

.countdown-label {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-bottom: 0.5rem;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .answer {
        font-size: 10rem;
    }

    .countdown {
        font-size: 1.5rem;
    }

    .countdown-label {
        font-size: 1rem;
    }

    input[type="datetime-local"] {
        font-size: 1rem;
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    .answer {
        font-size: 7rem;
    }

    .countdown {
        font-size: 1.2rem;
    }

    .countdown-label {
        font-size: 0.9rem;
    }

    input[type="datetime-local"] {
        font-size: 0.9rem;
        padding: 0.5rem 1rem;
    }
    /* scale background down on very small screens */
    .mountain { border-left-width: 140px; border-right-width: 140px; border-bottom-width: 160px; }
    .mountain.m-front {
        --mw: 200px;
        --mh: 240px;

        border-left: var(--mw) solid transparent;
        border-right: var(--mw) solid transparent;
        border-bottom: var(--mh) solid #3f4b6b;
        transform: translateX(-50%) scale(0.95);
        bottom: calc(-1 * var(--mh) / 2);
    }
    .snowflakes .flake { width: 5px; height: 5px; }
    /* smaller trees and flush bottom on very small screens */
    .tree { bottom: env(safe-area-inset-bottom, 0px); }
    .tree::before {
        bottom: 0px;
        border-left: 16px solid transparent;
        border-right: 16px solid transparent;
        border-bottom: 30px solid #0b3a20;
    }
    .tree::after {
        bottom: 12px;
        border-left: 12px solid transparent;
        border-right: 12px solid transparent;
        border-bottom: 22px solid #0b6b31;
    }
}