:root {
    --paper: #f2f5f3;
    --paper-deep: #e6ebe8;
    --ink: #17272f;
    --muted: #63737a;
    --blueprint: #12334b;
    --signal: #d64120;
    --cyan: #2c8c99;
    --line: rgba(18, 51, 75, 0.16);
    --line-strong: rgba(18, 51, 75, 0.3);
    --surface: rgba(255, 255, 255, 0.82);
    --surface-strong: #ffffff;
    --shadow: 0 24px 70px rgba(18, 51, 75, 0.12);
}

html {
    scroll-behavior: smooth;
}

body {
    color: var(--ink);
    font-family: Aptos, "Microsoft YaHei", "PingFang SC", sans-serif;
    background-color: var(--paper);
    background-image:
        linear-gradient(rgba(18, 51, 75, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(18, 51, 75, 0.045) 1px, transparent 1px),
        linear-gradient(rgba(18, 51, 75, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(18, 51, 75, 0.018) 1px, transparent 1px);
    background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
    background-attachment: fixed;
}

body::before {
    content: "";
    position: fixed;
    inset: 0 0 auto;
    height: 5px;
    z-index: 50;
    background: linear-gradient(90deg, var(--signal) 0 11%, var(--cyan) 11% 18%, var(--blueprint) 18% 100%);
}

.page {
    width: min(1240px, calc(100% - 40px));
    padding: 32px 0 64px;
}

.topbar {
    margin-bottom: 22px;
}

.brand {
    gap: 12px;
    color: var(--blueprint);
}

.brand::after {
    content: "TOOL WORKBENCH";
    font: 700 0.72rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.15em;
}

.brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 11px;
    box-shadow: 6px 6px 0 rgba(44, 140, 153, 0.18);
}

.home-link {
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--line-strong);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.66);
    color: var(--blueprint);
    font: 700 0.82rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.04em;
    box-shadow: 3px 3px 0 rgba(18, 51, 75, 0.08);
}

.home-link::before {
    content: "←";
    color: var(--signal);
}

.hero {
    position: relative;
    grid-template-columns: minmax(0, 1fr) minmax(210px, 280px);
    min-height: 278px;
    align-items: stretch;
    gap: 0;
    margin-bottom: 18px;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--line-strong);
    border-radius: 7px;
    background: var(--surface);
    box-shadow: var(--shadow), 8px 8px 0 rgba(18, 51, 75, 0.06);
    backdrop-filter: blur(10px);
}

.hero-copy {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: clamp(30px, 5vw, 58px);
}

.hero-copy::before {
    content: "INDEX / ALL TOOLS";
    position: absolute;
    top: 24px;
    left: clamp(30px, 5vw, 58px);
    color: var(--cyan);
    font: 700 0.8rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.16em;
}

h1 {
    max-width: 760px;
    margin-bottom: 14px;
    color: var(--blueprint);
    font-family: "Bahnschrift SemiCondensed", "Arial Narrow", "Microsoft YaHei", sans-serif;
    font-size: clamp(2.8rem, 5vw, 5.2rem);
    font-stretch: condensed;
    font-weight: 700;
    line-height: 0.82;
    letter-spacing: -0.055em;
}

.hero p {
    max-width: 610px;
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.75;
}

.total-pill {
    position: relative;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-start;
    padding: 28px;
    border-left: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 0;
    background: var(--blueprint);
    color: var(--paper);
    text-align: left;
}

.total-pill::before {
    content: "◉  ONLINE";
    color: #7fd0d5;
    font: 700 0.78rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.13em;
}

.total-pill::after {
    content: "";
    position: absolute;
    right: 20px;
    bottom: 20px;
    width: 40px;
    height: 40px;
    border-right: 1px solid rgba(255, 255, 255, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.total-pill strong {
    font-family: "Bahnschrift SemiCondensed", "Arial Narrow", sans-serif;
    font-size: clamp(2.9rem, 4.5vw, 4.8rem);
    font-weight: 600;
    letter-spacing: -0.08em;
}

.total-pill span {
    margin: 0;
    color: rgba(242, 245, 243, 0.7);
    font: 700 0.84rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.16em;
}

.search-panel {
    top: 10px;
    grid-template-columns: 1fr auto;
    gap: 0;
    margin-bottom: 14px;
    padding: 7px;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: rgba(242, 245, 243, 0.9);
    box-shadow: 0 12px 32px rgba(18, 51, 75, 0.11);
    backdrop-filter: blur(16px);
}

.search-box input {
    height: 54px;
    padding: 0 92px 0 50px;
    border: 0;
    border-radius: 2px;
    background: #fff;
    color: var(--blueprint);
    font-size: 1rem;
    box-shadow: inset 0 0 0 1px var(--line);
}

.search-box::before {
    content: "⌕";
    position: absolute;
    top: 50%;
    left: 17px;
    z-index: 1;
    color: var(--signal);
    font: 700 1.45rem/1 "Cascadia Code", Consolas, monospace;
    transform: translateY(-52%);
}

.search-box input:focus {
    border-color: transparent;
    box-shadow: inset 0 0 0 2px var(--cyan), 0 0 0 3px rgba(44, 140, 153, 0.13);
}

.search-icon {
    right: 14px;
    min-width: 32px;
    padding: 5px 7px;
    border: 1px solid var(--line);
    border-bottom-width: 2px;
    border-radius: 4px;
    color: var(--muted);
    font: 700 0/1 "Cascadia Code", Consolas, monospace;
}

.search-icon::after {
    content: "/";
    font-size: 0.8rem;
}

.clear-btn {
    min-width: 86px;
    margin-left: 7px;
    border: 0;
    border-radius: 3px;
    background: var(--blueprint);
    color: #fff;
    font: 700 0.88rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.08em;
}

.clear-btn:hover {
    background: var(--signal);
}

.category-strip {
    gap: 7px;
    margin-bottom: 12px;
    padding: 6px 0;
}

.filter-chip {
    min-height: 36px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.68);
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 700;
    backdrop-filter: none;
}

.filter-chip:hover,
.filter-chip.active {
    border-color: var(--blueprint);
    background: var(--blueprint);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 3px 3px 0 rgba(214, 65, 32, 0.28);
}

.status-line {
    margin: 0 2px 12px;
    color: var(--muted);
    font: 600 0.84rem/1.45 "Cascadia Code", Consolas, monospace;
}

.status-line::before {
    content: "// ";
    color: var(--cyan);
}

.categories {
    gap: 9px;
}

.category {
    position: relative;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.68);
    box-shadow: 4px 4px 0 rgba(18, 51, 75, 0.05);
    backdrop-filter: blur(8px);
}

.category::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    z-index: 2;
    background: var(--category-accent, var(--cyan));
}

.category-header {
    min-height: 72px;
    grid-template-columns: 46px 1fr auto 30px;
    gap: 14px;
    padding: 12px 18px 12px 20px;
}

.category-header:hover {
    background: rgba(18, 51, 75, 0.035);
}

.category-header:focus-visible,
.tool-card:focus-visible,
.filter-chip:focus-visible,
.home-link:focus-visible,
.clear-btn:focus-visible {
    outline: 3px solid var(--signal);
    outline-offset: 3px;
}

.category-icon {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line-strong);
    border-radius: 4px;
    background: transparent;
    color: var(--category-accent, var(--cyan));
    box-shadow: none;
}

.category-icon::before,
.tool-icon::before {
    content: "";
    position: absolute;
    inset: 5px;
    border-top: 1px solid currentColor;
    border-left: 1px solid currentColor;
    opacity: 0.24;
}

.category-icon::after {
    right: -3px;
    bottom: -3px;
    width: 7px;
    height: 7px;
    border: 2px solid var(--surface-strong);
    border-radius: 0;
}

.category-icon svg,
.tool-icon svg {
    stroke-width: 1.65;
}

.category-name {
    color: var(--blueprint);
    font-family: "Bahnschrift SemiCondensed", "Arial Narrow", "Microsoft YaHei", sans-serif;
    font-size: 1.16rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.category-hint {
    margin-top: 3px;
    color: var(--muted);
    font-size: 0.9rem;
}

.category-count {
    padding: 5px 8px;
    border: 1px solid var(--line);
    border-radius: 3px;
    background: transparent;
    color: var(--muted);
    font: 700 0.78rem/1 "Cascadia Code", Consolas, monospace;
}

.category-toggle {
    width: 25px;
    height: 25px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    color: var(--blueprint);
}

.category-content {
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 8px;
    padding: 0 12px 0 20px;
}

.category.expanded .category-content {
    padding: 2px 12px 14px 20px;
}

.tool-card {
    min-height: 132px;
    padding: 15px;
    border: 1px solid var(--line);
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.88);
    box-shadow: none;
}

.tool-card::after {
    content: "OPEN";
    position: absolute;
    right: 12px;
    top: 14px;
    color: transparent;
    font: 700 0.58rem/1 "Cascadia Code", Consolas, monospace;
    letter-spacing: 0.12em;
    transition: color 0.18s ease;
}

.tool-card:hover {
    z-index: 1;
    border-color: var(--category-accent, var(--cyan));
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0 color-mix(in srgb, var(--category-accent, var(--cyan)) 22%, transparent);
}

.tool-card:hover::after {
    color: var(--signal);
}

.tool-icon {
    width: 36px;
    height: 36px;
    border: 1px solid var(--line-strong);
    border-radius: 4px;
    background: transparent;
    color: var(--category-accent, var(--cyan));
    box-shadow: none;
}

.tool-icon::after {
    right: -2px;
    bottom: -2px;
    width: 5px;
    height: 5px;
    border: 1px solid white;
    border-radius: 0;
    background: var(--signal);
    opacity: 1;
}

.tool-arrow {
    visibility: hidden;
}

.tool-name {
    margin-top: 15px;
    color: var(--blueprint);
    font-size: 1.02rem;
    font-weight: 800;
}

.tool-desc {
    margin-top: 5px;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.55;
}

.empty {
    border: 1px dashed var(--line-strong);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.7);
}

@media (max-width: 720px) {
    .page {
        width: min(100% - 24px, 1240px);
        padding-top: 22px;
    }

    .topbar {
        flex-direction: row;
        align-items: center;
    }

    .brand::after {
        display: none;
    }

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

    .hero-copy {
        min-height: 230px;
        padding: 62px 22px 26px;
    }

    .hero-copy::before {
        top: 24px;
        left: 22px;
    }

    h1 {
        font-size: clamp(2.6rem, 13vw, 4.3rem);
    }

    .total-pill {
        width: 100%;
        min-height: 112px;
        flex-direction: row;
        align-items: end;
        padding: 20px 22px;
        border-top: 1px solid rgba(255, 255, 255, 0.18);
        border-left: 0;
    }

    .total-pill::before {
        position: absolute;
        top: 20px;
    }

    .total-pill strong {
        font-size: 3.2rem;
    }

    .search-panel {
        grid-template-columns: 1fr auto;
    }

    .clear-btn {
        height: auto;
        min-width: 66px;
    }

    .category-strip {
        flex-wrap: nowrap;
        overflow-x: auto;
        scrollbar-width: thin;
    }

    .filter-chip {
        flex: 0 0 auto;
    }

    .category-header {
        grid-template-columns: 40px 1fr auto;
        padding-left: 16px;
    }

    .category-content,
    .category.expanded .category-content {
        padding-inline: 16px 10px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}