/* =========================================================
   loaders — startup screen, cold-start banner, skeletons
   btn-loading + spin keyframe live in tokens.css.
   ========================================================= */

/* ----- cold start banner (free-tier wake-up) ----- */

.cold-start-banner {
    position: fixed;
    top: calc(env(safe-area-inset-top, 0) + 0.5rem);
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    max-width: calc(100% - 1rem);
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, var(--butter-100), var(--butter-200));
    color: var(--slate-700);
    border: 1.5px solid var(--butter-300);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md), var(--inset-highlight);
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    line-height: 1.3;
    animation: cold-start-in 0.35s var(--spring);
}

.cold-start-banner[hidden] {
    display: none !important;
}

.cold-start-banner i {
    color: var(--butter-500);
    flex-shrink: 0;
    font-size: 1rem;
}

.cold-start-dismiss {
    background: rgba(255, 255, 255, 0.6);
    border: none;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1;
    padding: 0.15rem 0.5rem;
    cursor: pointer;
    margin-left: 0.25rem;
    border-radius: var(--radius-full);
    opacity: 0.8;
    transition:
        opacity var(--transition-fast) var(--smooth),
        background var(--transition-fast) var(--smooth),
        transform var(--transition-fast) var(--spring);
}

.cold-start-dismiss:hover {
    opacity: 1;
    background: #fff;
    transform: rotate(90deg);
}

@keyframes cold-start-in {
    from { opacity: 0; transform: translateX(-50%) translateY(-12px) scale(0.9); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0)    scale(1);   }
}

/* ----- skeleton shimmer (cream-tinted) ----- */

@keyframes skeleton-shimmer {
    0%   { background-position: -468px 0; }
    100% { background-position:  468px 0; }
}

.skeleton {
    background: var(--cream-100);
    background-image: linear-gradient(
        to right,
        var(--cream-100) 0%,
        var(--cream-200) 20%,
        var(--cream-100) 40%,
        var(--cream-100) 100%
    );
    background-repeat: no-repeat;
    background-size: 800px 104px;
    display: inline-block;
    position: relative;
    animation: skeleton-shimmer 1.4s infinite linear;
    border-radius: var(--radius-sm);
}

.leaderboard-skeleton-row {
    height: 42px;
    width: 100%;
    margin-bottom: 8px;
    border-radius: var(--radius-md);
}

/* ----- startup loader ----- */

.startup-loader {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-primary);
    background-image:
        radial-gradient(60% 50% at  0%   0%, rgba(255, 180, 162, 0.45), transparent 60%),
        radial-gradient(55% 55% at 100%  0%, rgba(199, 206, 233, 0.40), transparent 60%),
        radial-gradient(70% 60% at 50% 100%, rgba(181, 234, 215, 0.36), transparent 60%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s var(--smooth), visibility 0.5s var(--smooth);
}

.startup-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

/* bouncing dots loader — kawaii alternative to a spinner.
   3 pastel dots stagger their bounce for a cheerful idle. */
.loader-spinner {
    width: auto;
    height: 24px;
    border: none;
    border-radius: 0;
    animation: none;
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.loader-spinner::before,
.loader-spinner::after,
.loader-spinner > span {
    content: '';
    display: block;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    animation: dot-bounce 0.9s var(--smooth) infinite;
}

.loader-spinner::before {
    background: var(--peach-500);
    animation-delay: 0s;
}
.loader-spinner > span {
    background: var(--mint-500);
    animation-delay: 0.18s;
}
.loader-spinner::after {
    background: var(--lavender-500);
    animation-delay: 0.36s;
}

@keyframes dot-bounce {
    0%, 80%, 100% { transform: translateY(0)    scale(0.9); opacity: 0.7; }
    40%           { transform: translateY(-14px) scale(1.1); opacity: 1;   }
}

.loader-text {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.01em;
}