:root {
    /* 极简黑白风：白底黑字 + 红色品牌点缀 */
    --bg: #ffffff;
    --bg-soft: #fafafa;
    --bg-muted: #f5f5f5;
    --border: #e5e5e5;
    --border-light: #f0f0f0;
    --text: #111111;
    --text-secondary: #555555;
    --text-tertiary: #999999;
    --primary: #000000;
    --primary-dark: #000000;
    --primary-light: #f5f5f5;
    --accent: #000000;
    --brand-red: #e50914;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.65;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 15px;
}

.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ===== Header ===== */
header {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 50;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s var(--ease);
}

header.scrolled {
    border-bottom-color: var(--border-light);
}

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

.logo-text {
    font-size: 20px;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.3px;
}

.logo-text span {
    color: var(--brand-red);
}

.logo-text .tm-symbol {
    font-size: 0.5em;
    vertical-align: super;
    font-weight: 600;
    color: var(--text);
    margin-left: 2px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: all 0.25s var(--ease);
}

/* ===== Nav ===== */
.nav-list {
    display: flex;
    list-style: none;
    gap: 28px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s var(--ease);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link i {
    font-size: 13px;
}

.nav-link:hover {
    color: var(--primary);
}

/* ===== Hero ===== */
.hero {
    padding: 80px 0 60px;
    position: relative;
}

.hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    background: var(--bg-muted);
    padding: 6px 14px;
    border-radius: 100px;
    margin-bottom: 24px;
}

.hero-label i {
    font-size: 11px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--text);
    letter-spacing: -1px;
    line-height: 1.15;
    margin-bottom: 20px;
    max-width: 680px;
}

.hero h1 em {
    font-style: normal;
    color: var(--text);
    position: relative;
    text-decoration: underline;
    text-decoration-color: var(--brand-red);
    text-decoration-thickness: 3px;
    text-underline-offset: 4px;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 520px;
    margin-bottom: 40px;
}

.hero-desc br {
    display: none;
}

.highlight {
    color: var(--primary);
    font-weight: 600;
}

/* Hero stats */
.hero-stats {
    display: flex;
    gap: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
}

.hero-stat {
    text-align: left;
}

.hero-stat-num {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.hero-stat-label {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

/* ===== Section Common ===== */
.section {
    padding: 72px 0;
}

.section-header {
    margin-bottom: 48px;
}

.section-eyebrow {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
    line-height: 1.3;
}

.section-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin-top: 12px;
    max-width: 560px;
    line-height: 1.7;
}

/* ===== Progress ===== */
.progress-section {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 40px;
    margin: 0 0 72px;
    display: flex;
    align-items: center;
    gap: 32px;
}

.progress-info {
    flex-shrink: 0;
    width: 180px;
}

.progress-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.progress-subtitle {
    font-size: 13px;
    color: var(--text-tertiary);
}

.progress-bar-wrap {
    flex: 1;
}

.progress-container {
    background: var(--bg-muted);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-bar {
    height: 100%;
    width: 90%;
    background: linear-gradient(90deg, #ff4d4f, #e50914);
    border-radius: 4px;
    position: relative;
}

.progress-text {
    font-size: 13px;
    color: var(--text-secondary);
}

.progress-text strong {
    color: var(--brand-red);
    font-weight: 700;
    font-size: 15px;
}

/* ===== Features ===== */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.feature-card {
    padding: 36px 28px;
    border-right: 1px solid var(--border-light);
    transition: background 0.2s var(--ease);
    position: relative;
}

.feature-card:last-child {
    border-right: none;
}

.feature-card:hover {
    background: var(--bg-soft);
}

.feature-num {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
    margin-bottom: 20px;
    display: block;
}

.feature-icon {
    font-size: 28px;
    color: var(--primary);
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 10px;
    letter-spacing: -0.2px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

/* ===== About ===== */
.about-section {
    padding: 72px 0;
    border-top: 1px solid var(--border-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-bottom: 56px;
}

.about-text p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.highlight-text {
    color: var(--text);
    font-weight: 600;
}

.brand-text {
    color: var(--primary);
    font-weight: 600;
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 24px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: #f5f5f5;
    border-radius: 1px;
}

.timeline-item {
    position: relative;
    padding-bottom: 28px;
    padding-left: 20px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 8px;
    width: 14px;
    height: 14px;
    background: var(--bg);
    border: 2px solid var(--brand-red);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item:last-child::before {
    background: var(--brand-red);
}

.timeline-year {
    font-size: 15px;
    font-weight: 700;
    color: var(--brand-red);
    margin-bottom: 2px;
}

.timeline-item > div:nth-child(2) {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 4px;
}

.timeline-item .brand-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    display: block;
    margin-bottom: 4px;
}

.timeline-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Founder ===== */
.founder-section {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    display: flex;
    align-items: flex-start;
    gap: 32px;
}

.founder-image {
    width: 100px;
    height: 100px;
    border-radius: 12px;
    background: var(--bg-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 800;
    color: var(--text);
    flex-shrink: 0;
    letter-spacing: -0.5px;
}

.founder-image .gig-red {
    color: var(--brand-red);
}

.founder-image .tm-symbol {
    font-size: 0.5em;
    vertical-align: super;
    font-weight: 600;
    margin-left: 1px;
}

.founder-info {
    flex: 1;
}

.founder-info h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.founder-info p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 10px;
}

.founder-info p:last-child {
    margin-bottom: 0;
}

/* ===== Particles ===== */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.15;
}

.particle {
    position: absolute;
    background: #000000;
    border-radius: 50%;
    opacity: 0.3;
    will-change: transform;
}

.grid-overlay {
    display: none;
}

/* ===== Footer ===== */
footer {
    padding: 48px 0 32px;
    margin-top: 48px;
    border-top: 1px solid var(--border-light);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
}

.footer-brand .company {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.footer-brand p {
    font-size: 13px;
    color: var(--text-tertiary);
}

.copyright {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 16px;
}

.license-text {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 8px;
}

.icp-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
}

.icp-link,
.gongan-link {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 12px;
    display: inline-flex;
    align-items: center;
    padding: 4px 0;
    transition: color 0.2s var(--ease);
}

.icp-link:hover,
.gongan-link:hover {
    color: var(--primary);
}

.icp-png-icon {
    height: 1em;
    width: auto;
    vertical-align: middle;
    margin-right: 5px;
}

.gongan-info {
    display: flex;
    align-items: center;
    gap: 5px;
}

.gongan-icon {
    height: 1.05em;
    width: auto;
    vertical-align: middle;
}

.gongan-icon-1 {
    margin-right: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
    font-size: 12px;
    color: var(--text-tertiary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    header {
        padding: 16px 0;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-list {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 260px;
        background: var(--bg);
        flex-direction: column;
        padding: 72px 28px 24px;
        gap: 8px;
        box-shadow: -8px 0 30px rgba(0,0,0,0.08);
        transform: translateX(100%);
        transition: transform 0.3s var(--ease);
        z-index: 99;
        border-left: 1px solid var(--border-light);
    }

    .nav-list.active {
        transform: translateX(0);
    }

    .nav-link {
        padding: 10px 0;
        font-size: 15px;
    }

    .hero {
        padding: 48px 0 40px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-desc {
        font-size: 15px;
        margin-bottom: 28px;
    }

    .hero-stats {
        gap: 28px;
        padding-top: 24px;
    }

    .hero-stat-num {
        font-size: 22px;
    }

    .progress-section {
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        margin-bottom: 48px;
    }

    .progress-info {
        width: 100%;
    }

    .features {
        grid-template-columns: 1fr;
        border-radius: 12px;
    }

    .feature-card {
        border-right: none;
        border-bottom: 1px solid var(--border-light);
        padding: 28px 24px;
    }

    .feature-card:last-child {
        border-bottom: none;
    }

    .section {
        padding: 48px 0;
    }

    .section-header {
        margin-bottom: 32px;
    }

    .about-section {
        padding: 48px 0;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-bottom: 40px;
    }

    .founder-section {
        flex-direction: column;
        padding: 28px 24px;
        gap: 20px;
    }

    .founder-image {
        width: 80px;
        height: 80px;
        font-size: 16px;
        border-radius: 10px;
    }

    .footer-top {
        flex-direction: column;
        gap: 24px;
    }

    .icp-info {
        align-items: flex-start;
    }

    footer {
        padding: 36px 0 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-stats {
        gap: 20px;
    }

    .hero-stat-num {
        font-size: 20px;
    }

    .section-title {
        font-size: 1.3rem;
    }
}