:root {
    color-scheme: light;
    --exp-ink: #17202a;
    --exp-muted: #64717f;
    --exp-line: rgba(28, 42, 54, 0.13);
    --exp-soft: #f5f7f8;
    --exp-panel: #ffffff;
    --exp-accent: #2f6f73;
    --exp-accent-dark: #255b5f;
    --exp-blue: #2b6cb0;
    --exp-orange: #d95f32;
    --exp-yellow: #e0a72f;
    --exp-red: #c8483b;
    --exp-green: #2f7d57;
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: #f3f5f6;
}

body.experiment-library-page {
    min-height: 100vh;
    margin: 0;
    font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    color: var(--exp-ink);
    background:
        linear-gradient(180deg, #f8fafb 0, #eef2f3 360px, #f5f6f7 100%);
}

button,
input,
select {
    font: inherit;
}

.experiment-page-loading,
.experiment-page-error {
    max-width: 920px;
    margin: 120px auto;
    padding: 24px;
    border: 1px solid var(--exp-line);
    border-radius: 8px;
    background: #fff;
    color: var(--exp-muted);
    text-align: center;
}

.experiment-page {
    min-height: 100vh;
}

.experiment-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    min-height: 62px;
    padding: 0 28px;
    border-bottom: 1px solid var(--exp-line);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.experiment-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--exp-ink);
    text-decoration: none;
    font-size: 18px;
    font-weight: 850;
}

.experiment-brand img {
    flex: 0 0 auto;
    object-fit: contain;
}

.experiment-topnav {
    display: flex;
    gap: 10px;
    align-items: center;
}

.experiment-topnav a {
    min-height: 34px;
    padding: 7px 12px;
    border: 1px solid var(--exp-line);
    border-radius: 7px;
    color: #2d3a45;
    background: #fff;
    text-decoration: none;
    font-size: 13px;
    font-weight: 750;
}

.experiment-topnav a:hover {
    border-color: rgba(47, 111, 115, 0.45);
    color: var(--exp-accent-dark);
}

.experiment-main {
    width: min(1220px, calc(100vw - 48px));
    margin: 0 auto;
    padding: 30px 0 44px;
}

.experiment-hero {
    min-height: 180px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: end;
    gap: 28px;
    padding: 22px 0 18px;
}

.experiment-eyebrow {
    margin: 0 0 8px;
    color: var(--exp-accent);
    font-size: 12px;
    font-weight: 850;
    letter-spacing: 0;
}

.experiment-hero h1 {
    max-width: 760px;
    margin: 0;
    font-size: 50px;
    line-height: 1.04;
    letter-spacing: 0;
}

.experiment-hero-copy {
    max-width: 740px;
    margin: 12px 0 0;
    color: var(--exp-muted);
    font-size: 16px;
    line-height: 1.72;
}

.experiment-hero-stats {
    padding: 18px;
    border: 1px solid var(--exp-line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.82);
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 12px;
}

.experiment-hero-stats strong {
    color: var(--exp-accent);
    font-size: 32px;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.experiment-hero-stats span {
    color: var(--exp-muted);
    font-size: 13px;
    font-weight: 700;
}

.experiment-controls {
    padding: 14px;
    border: 1px solid var(--exp-line);
    border-radius: 8px;
    background: #fff;
    display: grid;
    grid-template-columns: minmax(220px, 1fr) 170px 190px;
    gap: 10px;
}

.experiment-search {
    position: relative;
}

.experiment-search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--exp-muted);
    font-size: 18px;
}

.experiment-search-input,
.experiment-select {
    width: 100%;
    min-height: 42px;
    border: 1px solid rgba(28, 42, 54, 0.16);
    border-radius: 7px;
    background: #fff;
    color: var(--exp-ink);
    outline: none;
    font-size: 14px;
}

.experiment-search-input {
    padding: 9px 12px 9px 38px;
}

.experiment-select {
    padding: 8px 10px;
}

.experiment-search-input:focus,
.experiment-select:focus {
    border-color: rgba(47, 111, 115, 0.65);
    box-shadow: 0 0 0 3px rgba(47, 111, 115, 0.12);
}

.experiment-category-tabs {
    margin-top: 14px;
    width: 100%;
    min-width: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.experiment-category-tabs button {
    flex: 0 0 auto;
    min-height: 34px;
    padding: 7px 13px;
    border: 1px solid var(--exp-line);
    border-radius: 999px;
    background: #fff;
    color: #354350;
    cursor: pointer;
    font-size: 13px;
    font-weight: 800;
    white-space: nowrap;
}

.experiment-category-tabs button.active {
    border-color: rgba(47, 111, 115, 0.72);
    background: #eaf3f1;
    color: var(--exp-accent-dark);
}

.experiment-content {
    margin-top: 18px;
    display: block;
}

.experiment-list-pane {
    min-width: 0;
}

.experiment-list-head {
    margin-bottom: 10px;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
}

.experiment-list-head h2 {
    margin: 0;
    font-size: 18px;
}

.experiment-result-count {
    color: var(--exp-muted);
    font-size: 13px;
    font-weight: 750;
}

.experiment-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.experiment-card {
    min-width: 0;
    border: 1px solid var(--exp-line);
    border-radius: 8px;
    background: #fff;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.experiment-card:hover,
.experiment-card.selected {
    border-color: rgba(47, 111, 115, 0.45);
    box-shadow: 0 10px 24px rgba(20, 32, 44, 0.08);
}

.experiment-card:hover {
    transform: translateY(-1px);
}

.experiment-card-body {
    min-width: 0;
    padding: 14px 18px 14px;
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
}

.experiment-card-meta,
.experiment-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.experiment-card-meta span,
.experiment-detail-meta span {
    min-height: 22px;
    padding: 3px 7px;
    border-radius: 6px;
    background: #eef2f4;
    color: #46525e;
    font-size: 12px;
    font-weight: 750;
}

.experiment-card h2 {
    margin: 10px 0 6px;
    color: var(--exp-ink);
    font-size: 20px;
    line-height: 1.28;
}

.experiment-card p {
    margin: 0;
    color: var(--exp-muted);
    font-size: 14px;
    line-height: 1.62;
}

.experiment-tags {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.experiment-tags span {
    padding: 4px 7px;
    border: 1px solid rgba(28, 42, 54, 0.11);
    border-radius: 6px;
    background: #fbfcfd;
    color: #52606d;
    font-size: 12px;
    line-height: 1.2;
}

.experiment-card-actions {
    margin-top: auto;
    padding-top: 14px;
    display: flex;
    gap: 8px;
    align-items: center;
}

.experiment-btn {
    min-height: 34px;
    padding: 7px 11px;
    border: 1px solid rgba(28, 42, 54, 0.15);
    border-radius: 7px;
    background: #fff;
    color: #26313d;
    cursor: pointer;
    font-size: 13px;
    font-weight: 800;
}

.experiment-btn.primary {
    border-color: rgba(47, 111, 115, 0.84);
    background: var(--exp-accent);
    color: #fff;
}

.experiment-btn.primary:hover {
    background: var(--exp-accent-dark);
}

.experiment-btn.ghost:hover {
    border-color: rgba(47, 111, 115, 0.45);
    color: var(--exp-accent-dark);
}

.experiment-btn.wide {
    width: 100%;
}

.settings-input {
    width: 100%;
    min-height: 38px;
    padding: 8px 10px;
    border: 1px solid rgba(28, 42, 54, 0.16);
    border-radius: 7px;
    background: #fff;
    color: var(--exp-ink);
    outline: none;
    font: inherit;
    font-size: 14px;
}

.settings-input:focus {
    border-color: rgba(47, 111, 115, 0.65);
    box-shadow: 0 0 0 3px rgba(47, 111, 115, 0.12);
}

.settings-btn {
    min-height: 36px;
    padding: 8px 12px;
    border: 1px solid rgba(28, 42, 54, 0.15);
    border-radius: 7px;
    background: #fff;
    color: #26313d;
    cursor: pointer;
    font: inherit;
    font-size: 13px;
    font-weight: 800;
}

.settings-btn:hover {
    background: #f3f6f7;
}

.settings-btn.primary {
    border-color: rgba(47, 111, 115, 0.84);
    background: var(--exp-accent);
    color: #fff;
}

.settings-btn.primary:hover {
    background: var(--exp-accent-dark);
}

.settings-btn.danger {
    border-color: rgba(199, 53, 67, 0.24);
    background: rgba(199, 53, 67, 0.10);
    color: #c73543;
}

.settings-btn.danger:hover {
    background: rgba(199, 53, 67, 0.16);
}

.experiment-toast {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 6000;
    width: min(360px, calc(100vw - 36px));
    padding: 12px 14px;
    border: 1px solid rgba(28, 42, 54, 0.13);
    border-left: 4px solid var(--exp-accent);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    color: #354350;
    box-shadow: 0 14px 38px rgba(19, 31, 44, 0.16);
    font-size: 13px;
    line-height: 1.5;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.18s ease, transform 0.18s ease;
}

.experiment-toast.visible {
    opacity: 1;
    transform: translateY(0);
}

.experiment-toast.success {
    border-left-color: var(--exp-green);
}

.experiment-toast.error {
    border-left-color: var(--exp-red);
}

.experiment-toast.warning {
    border-left-color: #b7791f;
}

.experiment-confirm-overlay {
    position: fixed;
    inset: 0;
    z-index: 7000;
    display: grid;
    place-items: center;
    padding: 18px;
    background: rgba(19, 31, 44, 0.22);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.16s ease;
}

.experiment-confirm-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.experiment-confirm-dialog {
    width: min(420px, 100%);
    padding: 16px;
    border: 1px solid rgba(32, 42, 54, 0.12);
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 18px 48px rgba(19, 31, 44, 0.20);
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    transform: translateY(8px) scale(0.98);
    transition: transform 0.16s ease;
}

.experiment-confirm-dialog.prompt {
    width: min(460px, 100%);
}

.experiment-confirm-overlay.visible .experiment-confirm-dialog {
    transform: translateY(0) scale(1);
}

.experiment-confirm-mark {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: #eaf3f1;
    color: #285f63;
    display: grid;
    place-items: center;
    font-size: 18px;
    font-weight: 900;
}

.experiment-confirm-dialog.danger .experiment-confirm-mark {
    background: rgba(199, 53, 67, 0.10);
    color: #c73543;
}

.experiment-confirm-copy {
    min-width: 0;
}

.experiment-confirm-copy strong {
    display: block;
    color: var(--exp-ink);
    font-size: 15px;
    line-height: 1.35;
}

.experiment-confirm-copy p {
    margin: 5px 0 0;
    color: var(--exp-muted);
    font-size: 13px;
    line-height: 1.55;
}

.experiment-dialog-input {
    width: 100%;
    margin-top: 10px;
}

.experiment-confirm-actions {
    grid-column: 1 / -1;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.experiment-detail-wrap {
    position: sticky;
    top: 82px;
    min-width: 0;
}

.experiment-detail {
    border: 1px solid var(--exp-line);
    border-radius: 8px;
    background: #fff;
    overflow: hidden;
}

.experiment-detail > .experiment-cover {
    height: 170px;
}

.experiment-detail > h2,
.experiment-detail > p,
.experiment-detail > .experiment-tags,
.experiment-detail > .experiment-detail-meta,
.experiment-detail-section,
.experiment-detail-actions {
    margin-left: 16px;
    margin-right: 16px;
}

.experiment-detail > .experiment-detail-meta {
    margin-top: 14px;
}

.experiment-detail > h2 {
    margin-top: 12px;
    margin-bottom: 8px;
    font-size: 22px;
    line-height: 1.25;
}

.experiment-detail > p {
    margin-top: 0;
    color: var(--exp-muted);
    font-size: 14px;
    line-height: 1.65;
}

.experiment-detail-section {
    padding-top: 14px;
    border-top: 1px solid rgba(28, 42, 54, 0.09);
}

.experiment-detail-section h3 {
    margin: 0 0 8px;
    font-size: 14px;
}

.experiment-detail-section ul {
    margin: 0;
    padding-left: 18px;
    color: #4f5b67;
    font-size: 13px;
    line-height: 1.65;
}

.experiment-detail-actions {
    padding: 16px 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.experiment-detail-empty,
.experiment-empty {
    padding: 28px;
    border: 1px dashed rgba(28, 42, 54, 0.18);
    border-radius: 8px;
    background: #fff;
    color: var(--exp-muted);
    text-align: center;
}

.experiment-cover {
    position: relative;
    min-height: 220px;
    aspect-ratio: 16 / 9;
    background: #eef3f4;
    overflow: hidden;
    isolation: isolate;
}

.experiment-cover-image {
    position: absolute;
    inset: 0;
    z-index: 2;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    background: #f7fafb;
}

.experiment-cover-image.scene-rendered {
    background: #f7fafb;
}

.experiment-cover.has-image::before {
    display: none;
}

.experiment-cover.has-image .experiment-cover-fallback {
    display: none;
}

.experiment-cover.image-failed .experiment-cover-image {
    display: none;
}

.experiment-cover.image-failed.scene-rendered .experiment-cover-image {
    display: block;
}

.experiment-cover.image-failed .experiment-cover-fallback {
    display: block;
}

.experiment-cover.scene-rendered .experiment-cover-fallback {
    display: none;
}

.experiment-cover::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.46) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.46) 1px, transparent 1px);
    background-size: 22px 22px;
}

.experiment-cover-fallback {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.cover-line,
.cover-dot {
    position: absolute;
    display: block;
    z-index: 1;
}

.cover-line {
    height: 5px;
    border-radius: 999px;
    background: #596774;
    transform-origin: left center;
}

.cover-dot {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--exp-orange);
    box-shadow: 0 4px 12px rgba(20, 32, 44, 0.18);
}

.experiment-cover-fall .cover-line-a {
    left: 70%;
    top: 12%;
    width: 5px;
    height: 68%;
    background: repeating-linear-gradient(to bottom, #7b8794 0 8px, transparent 8px 16px);
}

.experiment-cover-fall .cover-dot-a {
    left: 34%;
    top: 19%;
}

.experiment-cover-fall .cover-dot-b {
    left: 34%;
    top: 57%;
    opacity: 0.28;
}

.experiment-cover-incline .cover-line-a {
    left: 13%;
    top: 70%;
    width: 88%;
    transform: rotate(-24deg);
}

.experiment-cover-incline .cover-dot-a {
    left: 36%;
    top: 38%;
    border-radius: 7px;
    transform: rotate(-24deg);
    background: var(--exp-blue);
}

.experiment-cover-collision .cover-line-a {
    left: 10%;
    top: 70%;
    width: 80%;
}

.experiment-cover-collision .cover-dot-a {
    left: 24%;
    top: 48%;
    background: var(--exp-blue);
}

.experiment-cover-collision .cover-dot-b {
    left: 58%;
    top: 48%;
}

.experiment-cover-cart .cover-line-a,
.experiment-cover-pulley .cover-line-a,
.experiment-cover-spring .cover-line-a {
    left: 10%;
    top: 70%;
    width: 80%;
}

.experiment-cover-cart .cover-dot-a {
    left: 28%;
    top: 48%;
    width: 82px;
    height: 42px;
    border-radius: 6px;
    background: var(--exp-blue);
}

.experiment-cover-cart .cover-dot-b {
    left: 68%;
    top: 28%;
    width: 42px;
    height: 42px;
    background: #67717d;
}

.experiment-cover-pulley .cover-dot-a {
    left: 45%;
    top: 18%;
    width: 74px;
    height: 74px;
    background: #dbe4e8;
    border: 10px solid var(--exp-blue);
}

.experiment-cover-pulley .cover-line-b {
    left: 58%;
    top: 45%;
    width: 5px;
    height: 40%;
    background: #67717d;
}

.experiment-cover-pulley .cover-dot-b {
    left: 50%;
    top: 70%;
    width: 46px;
    height: 46px;
    border-radius: 6px;
    background: #67717d;
}

.experiment-cover-spring .cover-line-b {
    left: 15%;
    top: 50%;
    width: 58%;
    height: 10px;
    background: repeating-linear-gradient(90deg, var(--exp-blue) 0 8px, transparent 8px 16px);
}

.experiment-cover-spring .cover-dot-a {
    left: 68%;
    top: 42%;
    width: 68px;
    height: 48px;
    border-radius: 6px;
    background: var(--exp-orange);
}

.experiment-cover-lens .cover-line-a,
.experiment-cover-mirror .cover-line-a {
    left: 10%;
    top: 52%;
    width: 80%;
    background: #e0a72f;
}

.experiment-cover-lens .cover-line-b {
    left: 55%;
    top: 13%;
    width: 5px;
    height: 74%;
    background: var(--exp-blue);
}

.experiment-cover-lens .cover-dot-a {
    left: 20%;
    top: 38%;
    border-radius: 4px;
    background: #222;
}

.experiment-cover-mirror .cover-line-b {
    left: 58%;
    top: 14%;
    width: 5px;
    height: 72%;
    background: var(--exp-blue);
    transform: rotate(20deg);
}

.experiment-cover-selector .cover-line-a,
.experiment-cover-solenoid .cover-line-a,
.experiment-cover-wave .cover-line-a,
.experiment-cover-ripple .cover-line-a {
    left: 12%;
    top: 50%;
    width: 76%;
}

.experiment-cover-selector .cover-dot-a {
    left: 24%;
    top: 43%;
    background: var(--exp-orange);
}

.experiment-cover-selector .cover-line-b {
    left: 48%;
    top: 14%;
    width: 5px;
    height: 72%;
    background: repeating-linear-gradient(to bottom, var(--exp-blue) 0 9px, transparent 9px 18px);
}

.experiment-cover-solenoid .cover-line-a {
    height: 46px;
    background: repeating-linear-gradient(90deg, var(--exp-blue) 0 7px, transparent 7px 16px);
}

.experiment-cover-solenoid .cover-dot-a,
.experiment-cover-solenoid .cover-dot-b {
    top: 43%;
    width: 30px;
    height: 30px;
    background: var(--exp-red);
}

.experiment-cover-solenoid .cover-dot-a {
    left: 12%;
}

.experiment-cover-solenoid .cover-dot-b {
    left: 80%;
    background: var(--exp-green);
}

.experiment-cover-wave .cover-line-a,
.experiment-cover-ripple .cover-line-a {
    height: 54px;
    background:
        radial-gradient(circle at 15px 27px, transparent 0 17px, var(--exp-blue) 18px 20px, transparent 21px) 0 0 / 54px 54px repeat-x;
}

.experiment-cover-ripple .cover-dot-a {
    left: 24%;
    top: 44%;
    width: 12px;
    height: 12px;
    background: var(--exp-blue);
}

.experiment-cover-ripple .cover-dot-b {
    left: 58%;
    top: 26%;
    width: 90px;
    height: 90px;
    background: transparent;
    border: 3px solid rgba(43, 108, 176, 0.55);
}

@media (max-width: 1120px) {
    .experiment-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 820px) {
    .experiment-topbar {
        padding: 0 16px;
    }

    .experiment-main {
        width: min(100vw - 28px, 720px);
        padding-top: 18px;
    }

    .experiment-hero {
        grid-template-columns: 1fr;
        min-height: 0;
        gap: 16px;
    }

    .experiment-hero h1 {
        font-size: 38px;
    }

    .experiment-hero-stats {
        width: 100%;
    }

    .experiment-controls {
        grid-template-columns: 1fr;
    }

    .experiment-grid {
        grid-template-columns: 1fr;
    }

    .experiment-cover {
        min-height: 220px;
    }
}

@media (max-width: 520px) {
    .experiment-topbar {
        align-items: flex-start;
        flex-direction: column;
        gap: 8px;
        padding: 12px 14px;
    }

    .experiment-topnav {
        width: 100%;
    }

    .experiment-topnav a {
        flex: 1;
        text-align: center;
    }

    .experiment-hero h1 {
        font-size: 29px;
        line-height: 1.12;
    }

    .experiment-hero-copy {
        font-size: 14px;
    }

    .experiment-card .experiment-cover {
        min-height: 190px;
    }

    .experiment-card-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .experiment-btn {
        width: 100%;
    }
}