/* ── 启动动效遮罩层 ── */
.intro-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    pointer-events: none;
}

.intro-draw-stage {
    position: relative;
}

/* 描边文字 —— 初始只显示轮廓线 */
.intro-draw-text {
    display: inline-block;
    transform-origin: center center;
    font-family: "RuiNexus Display", "RuiNexus Sans", sans-serif;
    font-size: clamp(58px, 12vw, 130px);
    color: transparent;
    -webkit-text-stroke: 1.5px var(--color-ink);
    white-space: nowrap;
    letter-spacing: -0.06em;
    line-height: 1;
}

/* 扫光遮罩 —— 从左向右移动，露出描边文字 */
.intro-draw-mask {
    position: absolute;
    inset: -12px -4px -12px 0;
    background: #ffffff;
    pointer-events: none;
}

/* 主内容初始隐藏 */
#main-content {
    opacity: 0;
}

#main-content.visible {
    opacity: 1;
    transition: opacity 0.6s ease;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .intro-draw-text {
        font-size: clamp(42px, 14vw, 72px);
        -webkit-text-stroke: 1px var(--color-ink);
    }
}

.site-header {
    position: fixed;
    top: 18px;
    left: 0;
    right: 0;
    z-index: 30;
    pointer-events: none;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    width: var(--container);
    margin: 0 auto;
    padding: 12px 14px 12px 18px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.78);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.07);
    backdrop-filter: blur(18px);
    pointer-events: auto;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--color-ink);
    font-family: "RuiNexus Display", "RuiNexus Sans", sans-serif;
    font-size: 22px;
    letter-spacing: -0.04em;
}

.brand-symbol {
    display: grid;
    width: 28px;
    height: 28px;
    place-items: center;
    border: 1px solid var(--color-ink);
    border-radius: 50%;
    font-size: 13px;
    line-height: 1;
}

.brand-text {
    opacity: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    border-radius: 999px;
    padding: 9px 13px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 700;
    transition: color 200ms ease, background-color 200ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
    background: var(--color-soft);
    color: var(--color-ink);
}

.hero {
    min-height: 100vh;
    display: grid;
    align-items: center;
    padding: 138px 0 76px;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    max-width: 820px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 26px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.hero-eyebrow::before {
    content: "";
    width: 36px;
    height: 1px;
    background: var(--color-ink);
}

.hero-title {
    margin: 0;
    color: var(--color-ink);
    font-family: "RuiNexus Display", "RuiNexus Sans", sans-serif;
    font-size: clamp(72px, 13vw, 180px);
    font-weight: 400;
    line-height: 0.9;
    letter-spacing: -0.07em;
}

.hero-subtitle {
    margin: 16px 0 0;
    color: var(--color-ink);
    font-family: "RuiNexus Display", "RuiNexus Sans", sans-serif;
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.04em;
}

.hero-subtitle span {
    display: inline;
    color: transparent;
    -webkit-text-stroke: 1.2px var(--color-ink);
}

.hero-copy {
    max-width: 680px;
    margin: 28px 0 0;
    color: var(--color-text);
    font-size: clamp(17px, 2vw, 20px);
    line-height: 1.7;
    text-wrap: pretty;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.hero-panel {
    position: relative;
    padding: 28px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-xl);
    background: rgba(255, 255, 255, 0.72);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
}

.hero-panel::before {
    content: "";
    position: absolute;
    inset: 18px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 24px;
    pointer-events: none;
}

.logo-lockup {
    display: grid;
    min-height: 260px;
    place-items: center;
    padding: 36px;
}

.logo-lockup img {
    width: min(320px, 100%);
    filter: grayscale(1) contrast(1.1);
}

.panel-caption {
    display: grid;
    gap: 12px;
    margin-top: 12px;
}

.caption-line {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    border-top: 1px solid var(--color-line);
    padding-top: 14px;
    color: var(--color-muted);
    font-size: 13px;
}

.caption-line strong {
    color: var(--color-ink);
}

.stat-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    margin-top: 56px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    background: var(--color-line);
    overflow: hidden;
}

.stat-card {
    min-height: 144px;
    padding: 32px 28px;
    background: rgba(255, 255, 255, 0.88);
}

.stat-card strong {
    display: block;
    color: var(--color-ink);
    font-family: "RuiNexus Display", "RuiNexus Sans", sans-serif;
    font-size: clamp(42px, 5.5vw, 68px);
    font-weight: 400;
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.stat-card span {
    display: block;
    margin-top: 10px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 500;
}

.split-section {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 72px;
    align-items: start;
}

.sticky-copy {
    position: sticky;
    top: 130px;
}

.feature-grid {
    display: grid;
    gap: 16px;
}

.feature-card,
.repo-card,
.process-card {
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.78);
    transition: border-color 260ms ease, box-shadow 260ms ease, transform 260ms ease;
}

.feature-card:hover,
.repo-card:hover,
.process-card:hover {
    transform: translateY(-6px);
    border-color: rgba(0, 0, 0, 0.18);
    box-shadow: 0 22px 72px rgba(0, 0, 0, 0.09), 0 4px 16px rgba(0, 0, 0, 0.03);
}

.feature-card {
    padding: 28px;
}

.feature-card h3,
.repo-card h3,
.process-card h3 {
    margin: 0;
    color: var(--color-ink);
    font-size: 22px;
    line-height: 1.2;
}

.feature-card p,
.repo-card p,
.process-card p {
    margin: 14px 0 0;
    color: var(--color-muted);
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.tag {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    border: 1px solid var(--color-line);
    border-radius: 999px;
    padding: 0 11px;
    color: var(--color-muted);
    font-size: 12px;
    font-weight: 700;
}

.repo-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 42px;
}

.repo-card {
    display: flex;
    min-height: 230px;
    flex-direction: column;
    justify-content: space-between;
    padding: 26px;
}

.repo-meta {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 26px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 700;
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 42px;
}

.process-card {
    padding: 24px;
}

.process-index {
    display: inline-grid;
    width: 38px;
    height: 38px;
    place-items: center;
    margin-bottom: 32px;
    border: 1px solid var(--color-ink);
    border-radius: 50%;
    color: var(--color-ink);
    font-size: 13px;
    font-weight: 800;
}

.cta-panel {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 36px;
    align-items: end;
    padding: clamp(40px, 7vw, 80px);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-xl);
    background: var(--color-ink);
    color: var(--color-paper);
    box-shadow: var(--shadow-soft);
}

.cta-panel .section-kicker,
.cta-panel .section-lead {
    color: rgba(255, 255, 255, 0.68);
}

.cta-panel .section-title {
    color: var(--color-paper);
}

.cta-panel .btn-secondary {
    border-color: rgba(255, 255, 255, 0.82);
    background: transparent;
    color: var(--color-paper);
}

.cta-panel .btn-secondary:hover,
.cta-panel .btn-secondary:focus-visible {
    background: var(--color-paper);
    color: var(--color-ink);
}

.site-footer {
    padding: 48px 0 56px;
    color: var(--color-muted);
    font-size: 13px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    border-top: 1px solid var(--color-line);
    padding-top: 24px;
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-links a:hover,
.footer-links a:focus-visible {
    color: var(--color-ink);
}

@media (max-width: 980px) {
    .nav-links {
        display: none;
    }

    .hero-grid,
    .split-section,
    .cta-panel {
        grid-template-columns: 1fr;
    }

    .sticky-copy {
        position: static;
    }

    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 760px) {
    .site-header {
        top: 10px;
    }

    .navbar {
        padding: 10px 12px;
    }

    .hero {
        padding-top: 118px;
    }

    .hero-grid {
        gap: 42px;
    }

    .hero-actions {
        display: grid;
    }

    .logo-lockup {
        min-height: 190px;
        padding: 26px;
    }

    .stat-strip,
    .repo-grid,
    .process-grid {
        grid-template-columns: 1fr;
    }

    .caption-line,
    .footer-inner {
        flex-direction: column;
    }
}