:root {
    --project-text: #0F172A;
    --project-body: #475569;
    --project-muted: #64748B;
    --project-accent: #0EA5E9;
    --project-accent-dark: #0369A1;
    --project-indigo: #4338CA;
    --project-purple: #A78BFA;
    --project-line: rgba(148, 163, 184, 0.16);
    --project-card: rgba(255, 255, 255, 0.52);
    --project-shadow: 0 18px 45px rgba(15, 23, 42, 0.05);
    --project-shadow-hover: 0 26px 70px rgba(15, 23, 42, 0.09);
    --project-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --project-max-width: 1180px;
}

body.project-page {
    position: relative;
    color: var(--project-text);
    font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: linear-gradient(180deg, #F8FBFF 0%, #EFF7FA 45%, #F8FBFF 100%);
}

body.project-page::before,
body.project-page::after {
    content: "";
    position: fixed;
    pointer-events: none;
    z-index: 0;
}

body.project-page::before {
    inset: 0;
    background-image:
        linear-gradient(rgba(15, 23, 42, 0.026) 1px, transparent 1px),
        linear-gradient(90deg, rgba(15, 23, 42, 0.022) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.58), rgba(0, 0, 0, 0.08));
    -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.58), rgba(0, 0, 0, 0.08));
}

body.project-page::after {
    top: -20px;
    left: -20px;
    right: -20px;
    height: 70vh;
    background:
        radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.10), transparent 32%),
        radial-gradient(circle at 80% 10%, rgba(99, 102, 241, 0.08), transparent 30%);
    animation: projectGlowFloat 18s ease-in-out infinite alternate;
    will-change: transform;
}

.project-page #header,
.project-page #main,
.project-page #footer,
.project-page .back-to-top {
    position: relative;
    z-index: 1;
}

.project-page #header {
    position: sticky;
    top: 0;
    left: auto;
    right: auto;
    height: 72px;
    overflow: visible;
    background: rgba(255, 255, 255, 0.75);
    border-bottom: 1px solid rgba(148, 163, 184, 0);
    box-shadow: 0 0 0 rgba(15, 23, 42, 0);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: background-color 250ms ease, border-color 250ms ease, box-shadow 250ms ease;
}

.project-page #header::before {
    display: none;
}

.project-page #header.header-scrolled,
.project-page #header.header-inner {
    height: 72px;
    background: rgba(255, 255, 255, 0.84);
    border-bottom-color: rgba(148, 163, 184, 0.18);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.055);
}

.project-page #header .container-xxl {
    width: min(100%, var(--project-max-width));
    padding-right: 24px;
    padding-left: 24px;
}

.project-page #header #logo {
    z-index: 901;
}

.project-page #header #logo img {
    max-height: 34px;
}

.project-page .navbar>ul>li {
    padding: 10px 0 10px 24px;
}

.project-page .navbar a,
.project-page .navbar a:focus {
    color: var(--project-body);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0;
    padding: 8px 2px;
    transition: color 250ms ease;
}

.project-page .navbar>ul>li>a::before {
    width: 100%;
    height: 1px;
    bottom: -4px;
    visibility: visible;
    background-color: rgba(14, 165, 233, 0.72);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 250ms ease;
}

.project-page .navbar a:hover,
.project-page .navbar .active,
.project-page .navbar .active:focus,
.project-page .navbar li:hover>a {
    color: var(--project-text);
}

.project-page .navbar a:hover::before,
.project-page .navbar li:hover>a::before,
.project-page .navbar .active::before {
    transform: scaleX(1);
}

.project-page .mobile-nav-toggle {
    color: var(--project-text);
    z-index: 1001;
}

.project-page #main,
.project-page #project.project-page-section {
    background: transparent;
}

.project-page #project.project-page-section {
    position: relative;
    z-index: 1;
    padding: 96px 24px 120px;
    overflow: hidden;
}

.project-page .project-shell {
    width: min(100%, var(--project-max-width));
    max-width: var(--project-max-width);
    padding-right: 0;
    padding-left: 0;
}

.project-page #project-title.project-hero {
    position: relative;
    max-width: 820px;
    margin: 0 auto 88px;
    padding-bottom: 26px;
    text-align: center;
}

.project-page #project-title::before {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 72px;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(90deg, transparent, #38BDF8, #6366F1, transparent);
    transform: translateX(-50%);
}

.project-page .project-eyebrow,
.project-page #project-title p {
    margin: 0 0 10px;
    color: var(--project-muted);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0;
}

.project-page #project-title h2 {
    width: auto;
    margin: 0;
    color: var(--project-text);
    font-size: clamp(48px, 5vw, 56px);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -0.04em;
    text-align: center;
    text-align-last: auto;
}

.project-page #project-container {
    margin: 0;
}

.project-page .project-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-rows: 1fr;
    align-items: stretch;
    gap: 32px;
    width: 100%;
    max-width: var(--project-max-width);
    margin: 0 auto;
}

.project-page .project-card {
    position: relative;
    height: 300px;
    min-height: 300px;
    overflow: hidden;
    background: var(--project-card);
    border: 1px solid var(--project-line);
    border-radius: 28px;
    box-shadow: var(--project-shadow);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    transition: transform 280ms var(--project-ease), border-color 280ms var(--project-ease), box-shadow 280ms var(--project-ease), background-color 280ms var(--project-ease);
}

.project-page .project-card:hover {
    background: rgba(255, 255, 255, 0.62);
    border-color: rgba(56, 189, 248, 0.30);
    box-shadow: var(--project-shadow-hover);
    transform: translateY(-6px);
}

.project-page .project-link {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 32px 36px;
    color: inherit;
}

.project-page .project-link:hover,
.project-page .project-link:focus {
    color: inherit;
}

.project-page .project-card__top {
    display: flex;
    align-items: center;
    gap: 18px;
    min-width: 0;
}

.project-page .project-github-icon {
    display: grid;
    flex: 0 0 auto;
    place-items: center;
    width: 42px;
    height: 42px;
    color: #FFFFFF;
    background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 55%, #0369A1 100%);
    border-radius: 999px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
}

.project-page .project-github-icon i {
    font-size: 20px;
    line-height: 1;
}

.project-page .project-name {
    min-width: 0;
    margin: 0;
    color: var(--project-text);
    font-size: clamp(24px, 2.3vw, 28px);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.03em;
}

.project-page .project-description {
    display: -webkit-box;
    flex: 0 0 auto;
    min-height: calc(16px * 1.8 * 3);
    margin: 18px 0 0;
    overflow: hidden;
    color: var(--project-body);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.8;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
}

.project-page .project-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    margin-top: auto;
    padding-top: 24px;
}

.project-page .project-badges {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.project-page .project-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 32px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
}

.project-page .project-badge--stars {
    color: var(--project-accent-dark);
    background: rgba(14, 165, 233, 0.08);
    border: 1px solid rgba(14, 165, 233, 0.18);
}

.project-page .project-badge--forks {
    color: var(--project-indigo);
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.18);
}

.project-page .project-cta {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    color: var(--project-accent-dark);
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
}

.project-page .project-cta i {
    margin-left: 3px;
    font-size: 18px;
}

.project-page.project-page--enhanced .project-eyebrow,
.project-page.project-page--enhanced #project-title h2,
.project-page.project-page--enhanced #project-title::before,
.project-page.project-page--enhanced .project-card {
    opacity: 0;
}

.project-page.project-page--enhanced .project-eyebrow,
.project-page.project-page--enhanced #project-title h2,
.project-page.project-page--enhanced .project-card {
    transform: translateY(22px);
}

.project-page.project-page--enhanced #project-title.is-visible .project-eyebrow {
    animation: projectFadeUp 0.6s ease-out forwards;
}

.project-page.project-page--enhanced #project-title.is-visible h2 {
    animation: projectFadeUp 0.6s ease-out 0.08s forwards;
}

.project-page.project-page--enhanced #project-title.is-visible::before {
    animation: projectLineIn 0.62s ease-out 0.18s forwards;
}

.project-page.project-page--enhanced .project-card.is-visible {
    animation: projectCardIn 0.6s ease-out forwards;
    animation-delay: var(--project-delay, 0ms);
}

@keyframes projectFadeUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes projectLineIn {
    from {
        opacity: 0;
        transform: translateX(-50%) scaleX(0);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) scaleX(1);
    }
}

@keyframes projectCardIn {
    from {
        opacity: 0;
        transform: translateY(22px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes projectGlowFloat {
    from {
        transform: translate3d(-8px, 6px, 0);
    }

    to {
        transform: translate3d(8px, -8px, 0);
    }
}

@media (max-width: 991px) {
    .project-page #header,
    .project-page #header.header-scrolled,
    .project-page #header.header-inner {
        height: 68px;
    }

    .project-page #header #logo img {
        max-height: 30px;
    }

    .project-page #navbar.navbar-mobile {
        position: fixed;
        inset: 0;
        overflow: hidden;
        background: rgba(15, 23, 42, 0.18);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        transition: 0.3s;
        z-index: 999;
    }

    .project-page #navbar.navbar-mobile .mobile-nav-toggle {
        position: absolute;
        top: 20px;
        right: 24px;
        color: var(--project-text);
    }

    .project-page #navbar.navbar-mobile ul {
        display: block;
        position: absolute;
        top: 76px;
        right: 18px;
        bottom: auto;
        left: 18px;
        padding: 10px;
        overflow-y: auto;
        background: rgba(255, 255, 255, 0.96);
        border: 1px solid rgba(148, 163, 184, 0.18);
        border-radius: 20px;
        box-shadow: 0 18px 44px rgba(15, 23, 42, 0.12);
    }

    .project-page #navbar.navbar-mobile>ul>li {
        padding: 0;
    }

    .project-page #navbar.navbar-mobile a,
    .project-page #navbar.navbar-mobile a:focus {
        padding: 12px 14px;
        color: #334155;
        border-radius: 10px;
    }

    .project-page #navbar.navbar-mobile a:hover,
    .project-page #navbar.navbar-mobile .active,
    .project-page #navbar.navbar-mobile li:hover>a {
        color: var(--project-text);
        background: #F8FAFC;
    }

    .project-page #navbar.navbar-mobile a::before {
        display: none;
    }

    .project-page #project.project-page-section {
        padding: 80px 20px 104px;
    }

    .project-page #project-title.project-hero {
        margin-bottom: 72px;
    }

    .project-page .project-grid {
        gap: 24px;
    }

    .project-page .project-link {
        padding: 28px 28px;
    }
}

@media (max-width: 760px) {
    .project-page .project-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 575px) {
    .project-page #project.project-page-section {
        padding: 68px 16px 88px;
    }

    .project-page #project-title h2 {
        font-size: 36px;
    }

    .project-page #project-title.project-hero {
        margin-bottom: 56px;
    }

    .project-page .project-card {
        height: 330px;
        min-height: 330px;
        border-radius: 24px;
    }

    .project-page .project-link {
        padding: 24px 22px;
    }

    .project-page .project-github-icon {
        width: 38px;
        height: 38px;
    }

    .project-page .project-meta {
        align-items: flex-start;
        flex-direction: column;
        gap: 14px;
    }
}

@media (prefers-reduced-motion: reduce) {
    body.project-page::after,
    .project-page #project-title::before,
    .project-page .project-eyebrow,
    .project-page #project-title h2,
    .project-page .project-card,
    .project-page .project-github-icon,
    .project-page .project-badge,
    .project-page .project-cta i {
        animation: none !important;
        transition: none !important;
    }

    .project-page.project-page--enhanced .project-eyebrow,
    .project-page.project-page--enhanced #project-title h2,
    .project-page.project-page--enhanced #project-title::before,
    .project-page.project-page--enhanced .project-card,
    .project-page .project-card:hover {
        opacity: 1 !important;
        transform: none !important;
    }
}

/* ===== 项目分类 Tab / 标签（任务2：内容分类与标签化） ===== */
.project-page .project-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 6px auto 34px;
}

.project-page .project-tab {
    padding: 9px 22px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    color: var(--project-muted);
    background: var(--project-card);
    border: 1px solid var(--project-line);
    cursor: pointer;
    transition: color 0.3s var(--project-ease), background 0.3s var(--project-ease), transform 0.3s var(--project-ease), box-shadow 0.3s var(--project-ease);
}

.project-page .project-tab:hover {
    transform: translateY(-2px);
    color: var(--project-accent-dark);
}

.project-page .project-tab.active {
    color: #fff;
    background: linear-gradient(135deg, var(--project-accent) 0%, var(--project-accent-dark) 100%);
    border-color: transparent;
    box-shadow: var(--project-shadow);
}

.project-page .project-card.is-hidden {
    display: none !important;
}

.project-page .project-tag {
    flex: 0 0 auto;
    margin-left: auto;
    padding: 5px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    color: var(--project-accent-dark);
    background: rgba(14, 165, 233, 0.12);
    border: 1px solid rgba(14, 165, 233, 0.22);
}