/* ===========================================================
   Reverse Image Search — visual design system
   Palette: cool paper white surface, deep ink text,
   electric indigo -> cyan "scan" gradient as the signature accent.
   =========================================================== */

.ri-tool {
    --ri-bg: #F6F7FB;
    --ri-surface: #FFFFFF;
    --ri-ink: #161A2E;
    --ri-muted: #6B7280;
    --ri-border: #E4E6F1;
    --ri-accent: #5B5BF0;
    --ri-accent-2: #00C2D1;
    --ri-accent-soft: #EEF0FE;
    --ri-warning-bg: #FFF8EA;
    --ri-warning-border: #F0B429;
    --ri-warning-ink: #7A4B00;
    --ri-error-bg: #FDF0F1;
    --ri-error-border: #E5484D;
    --ri-error-ink: #7A1315;
    --ri-radius: 16px;
    --ri-font-display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
    --ri-font-body: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;

    max-width: 760px;
    margin: 0 auto;
    padding: 40px 32px;
    background: var(--ri-surface);
    border: 1px solid var(--ri-border);
    border-radius: var(--ri-radius);
    box-shadow: 0 1px 2px rgba(22, 26, 46, 0.04), 0 12px 32px -16px rgba(22, 26, 46, 0.12);
    font-family: var(--ri-font-body);
    color: var(--ri-ink);
    box-sizing: border-box;
}

.ri-tool *,
.ri-tool *::before,
.ri-tool *::after {
    box-sizing: border-box;
}

/* ---------- Intro ---------- */
.ri-tool__intro {
    text-align: center;
    margin-bottom: 28px;
}

.ri-eyebrow {
    display: inline-block;
    font-family: var(--ri-font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ri-accent);
    background: var(--ri-accent-soft);
    padding: 5px 12px;
    border-radius: 999px;
    margin-bottom: 14px;
}

.ri-tool__title {
    font-family: var(--ri-font-display);
    font-size: 26px;
    font-weight: 700;
    line-height: 1.25;
    margin: 0 0 8px;
    letter-spacing: -0.01em;
}

.ri-tool__subtitle {
    font-size: 15px;
    color: var(--ri-muted);
    margin: 0;
    line-height: 1.5;
}

/* ---------- Dropzone ---------- */
.ri-dropzone {
    position: relative;
    border: 1.5px dashed var(--ri-border);
    border-radius: 14px;
    background: var(--ri-bg);
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
    outline: none;
}

.ri-dropzone:hover,
.ri-dropzone:focus-visible {
    border-color: var(--ri-accent);
    background: var(--ri-accent-soft);
}

.ri-dropzone:focus-visible {
    box-shadow: 0 0 0 3px rgba(91, 91, 240, 0.25);
}

.ri-dropzone.is-dragover {
    border-color: var(--ri-accent);
    background: var(--ri-accent-soft);
    transform: scale(1.01);
}

.ri-dropzone__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 14px;
    color: var(--ri-accent);
}

.ri-dropzone__icon svg {
    width: 100%;
    height: 100%;
}

.ri-dropzone__text {
    font-size: 15px;
    margin: 0 0 6px;
    color: var(--ri-ink);
}

.ri-dropzone__text strong {
    color: var(--ri-accent);
    font-weight: 600;
}

.ri-dropzone__meta {
    font-size: 12.5px;
    color: var(--ri-muted);
    margin: 0;
}

.ri-visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---------- Loader: signature "scan" spinner ---------- */
.ri-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 26px 0 6px;
}

.ri-loader__ring {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--ri-accent), var(--ri-accent-2), var(--ri-accent));
    -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
    mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 3px));
    animation: ri-spin 0.9s linear infinite;
    flex-shrink: 0;
}

.ri-loader__label {
    font-size: 14px;
    font-weight: 500;
    color: var(--ri-ink);
}

.ri-loader__dots span {
    animation: ri-dot-fade 1.4s infinite;
    opacity: 0;
}

.ri-loader__dots span:nth-child(2) { animation-delay: 0.2s; }
.ri-loader__dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes ri-spin {
    to { transform: rotate(360deg); }
}

@keyframes ri-dot-fade {
    0%, 80%, 100% { opacity: 0; }
    40% { opacity: 1; }
}

/* Scanning sweep across the dropzone while processing */
.ri-tool.is-scanning .ri-dropzone {
    overflow: hidden;
    border-color: var(--ri-accent);
}

.ri-tool.is-scanning .ri-dropzone::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--ri-accent-2), var(--ri-accent), transparent);
    animation: ri-sweep 1.6s ease-in-out infinite;
}

@keyframes ri-sweep {
    0% { transform: translateY(0); opacity: 0; }
    10% { opacity: 1; }
    50% { transform: translateY(100%); }
    90% { opacity: 1; }
    100% { transform: translateY(0); opacity: 0; }
}

/* ---------- Notice (errors / limits / empty state) ---------- */
.ri-notice {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin-top: 20px;
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
    border: 1px solid var(--ri-border);
    background: var(--ri-bg);
    color: var(--ri-ink);
}

.ri-notice__icon {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-top: 1px;
}

.ri-notice--warning {
    background: var(--ri-warning-bg);
    border-color: var(--ri-warning-border);
    color: var(--ri-warning-ink);
}

.ri-notice--error {
    background: var(--ri-error-bg);
    border-color: var(--ri-error-border);
    color: var(--ri-error-ink);
}

/* ---------- Results ---------- */
.ri-results {
    margin-top: 32px;
    border-top: 1px solid var(--ri-border);
    padding-top: 24px;
}

.ri-results__header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 16px;
    gap: 8px;
    flex-wrap: wrap;
}

.ri-results__count {
    font-family: var(--ri-font-display);
    font-size: 18px;
    font-weight: 700;
    margin: 0;
}

.ri-results__count span {
    color: var(--ri-accent);
}

.ri-results__note {
    font-size: 13px;
    color: var(--ri-muted);
    margin: 0;
}

.ri-results__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 14px;
}

.ri-card {
    position: relative;
    display: block;
    background: var(--ri-surface);
    border: 1px solid var(--ri-border);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    color: var(--ri-ink);
    transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.ri-card:hover,
.ri-card:focus-visible {
    box-shadow: 0 10px 24px -12px rgba(22, 26, 46, 0.28);
    transform: translateY(-3px);
    border-color: var(--ri-accent);
    outline: none;
}

.ri-card__media {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--ri-bg);
    overflow: hidden;
}

.ri-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.35s ease;
}

.ri-card:hover .ri-card__media img {
    transform: scale(1.06);
}

.ri-card__external {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(22, 26, 46, 0.75);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.ri-card:hover .ri-card__external {
    opacity: 1;
    transform: translateY(0);
}

.ri-card__external svg {
    width: 13px;
    height: 13px;
}

.ri-card__body {
    padding: 10px 11px 12px;
}

.ri-card__title {
    font-size: 12.5px;
    font-weight: 600;
    margin: 0 0 4px;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.ri-card__source {
    font-size: 11px;
    color: var(--ri-muted);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ---------- Empty state ---------- */
.ri-empty {
    text-align: center;
    padding: 36px 20px;
}

.ri-empty__icon {
    width: 42px;
    height: 42px;
    margin: 0 auto 12px;
    color: var(--ri-muted);
}

.ri-empty__title {
    font-family: var(--ri-font-display);
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 4px;
}

.ri-empty__text {
    font-size: 13.5px;
    color: var(--ri-muted);
    margin: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 560px) {
    .ri-tool {
        padding: 28px 18px;
        border-radius: 12px;
    }
    .ri-tool__title {
        font-size: 21px;
    }
    .ri-dropzone {
        padding: 30px 16px;
    }
    .ri-results__grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: 10px;
    }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    .ri-loader__ring,
    .ri-tool.is-scanning .ri-dropzone::after,
    .ri-loader__dots span,
    .ri-card__media img,
    .ri-card {
        animation: none !important;
        transition: none !important;
    }
}