/* ═══════════════════════════════════════════════════════════════════════════
   Quick Search Mode — v2.0.0
   Progressive skeleton loader, progress bar, and staged reveal animations.
   Mirrors ISSE V3 loading paradigm tuned for sub-3-second instant pipeline.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Loading Skeleton Container ─────────────────────────────────────────── */

.qs-loading-skeleton {
    width: 100%;
    padding: 12px 0;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.qs-loading-skeleton.visible {
    opacity: 1;
    transform: translateY(0);
}

.qs-loading-skeleton.fade-out {
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity 0.35s ease, transform 0.35s ease;
    pointer-events: none;
}

/* ─── Progress Bar ───────────────────────────────────────────────────────── */

.qs-progress-container {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 22px;
    padding: 0 4px;
}

.qs-progress-bar {
    flex: 1;
    height: 3px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.06);
    overflow: hidden;
    position: relative;
}

.qs-progress-fill {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, #a78bfa, #818cf8, #38bdf8);
    transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.qs-progress-fill::after {
    content: '';
    position: absolute;
    right: 0;
    top: -2px;
    width: 8px;
    height: 7px;
    border-radius: 50%;
    background: #a78bfa;
    box-shadow: 0 0 10px #a78bfa;
    opacity: 0.9;
}

.qs-progress-label {
    font-family: var(--font-body, 'Poppins', sans-serif);
    font-size: 11.5px;
    color: rgba(255, 255, 255, 0.45);
    white-space: nowrap;
    letter-spacing: 0.3px;
    min-width: 110px;
    text-align: right;
}

/* ─── Skeleton Shimmer Placeholders ──────────────────────────────────────── */

.qs-skeleton-body {
    transition: opacity 0.25s ease;
}

.qs-skeleton-canvas {
    margin-bottom: 20px;
}

.qs-skel-line {
    height: 14px;
    border-radius: 8px;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.04) 0%,
        rgba(255, 255, 255, 0.08) 40%,
        rgba(255, 255, 255, 0.04) 80%
    );
    background-size: 200% 100%;
    animation: qsShimmer 1.8s ease infinite;
    margin-bottom: 10px;
}

.qs-skel-title {
    width: 55%;
    height: 20px;
    margin-bottom: 12px;
}

.qs-skel-subtitle {
    width: 35%;
    height: 13px;
    margin-bottom: 16px;
}

.qs-skel-desc {
    width: 88%;
}

.qs-skel-desc.short {
    width: 62%;
}

/* ─── Skeleton Result Placeholders ───────────────────────────────────────── */

.qs-skeleton-results {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.qs-skel-result {
    height: 76px;
    border-radius: 14px;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.025) 0%,
        rgba(255, 255, 255, 0.05) 40%,
        rgba(255, 255, 255, 0.025) 80%
    );
    background-size: 200% 100%;
    animation: qsShimmer 1.8s ease infinite;
}

.qs-skel-result:nth-child(2) { animation-delay: 0.15s; }
.qs-skel-result:nth-child(3) { animation-delay: 0.3s; }
.qs-skel-result:nth-child(4) { animation-delay: 0.45s; }

/* ─── Shimmer Keyframes ──────────────────────────────────────────────────── */

@keyframes qsShimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ─── Staged Reveal Animation ────────────────────────────────────────────── */

.qs-stage-reveal {
    opacity: 0;
    transform: translateY(10px);
    animation: qsFadeSlideIn 0.35s ease forwards;
}

.qs-stage-reveal.delay-1 { animation-delay: 0.05s; }
.qs-stage-reveal.delay-2 { animation-delay: 0.12s; }

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

/* ─── Responsive ─────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
    .qs-progress-label { display: none; }
}