:root {
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --card: #ffffff;
    --primary: #2563eb;
    --primary-soft: rgba(37, 99, 235, 0.12);
    --text: #0f172a;
    --text-muted: #1e293b;
    --border: #e2e8f0;
    --success: #15803d;
    --table-row: #f1f5f9;
    --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font);
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 22%, #ffffff 100%);
    color: var(--text);
    line-height: 1.6;
}

.title-accent {
    position: relative;
    display: inline-flex;
    flex-direction: column;
    gap: 0;
}

.title-accent::after {
    content: '';
    display: block;
    height: 4px;
    width: 72px;
    border-radius: 999px;
    margin-top: 12px;
    background: linear-gradient(90deg, #a855f7 0%, #ec4899 50%, #f97316 100%);
}

.title-left {
    align-items: flex-start;
    text-align: left;
}

.title-center {
    align-items: center;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.title-center::after {
    margin-left: auto;
    margin-right: auto;
}

.container {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid rgba(226, 232, 240, 0.9);
    backdrop-filter: blur(12px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
}

.logo {
    font-weight: 700;
    font-size: 22px;
    letter-spacing: 0.04em;
}

nav a {
    color: var(--text-muted);
    margin-left: 24px;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.hero {
    padding: 120px 0 80px;
}

.hero-content {
    display: grid;
    gap: 48px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    align-items: start;
}

.hero-text h1 {
    font-size: clamp(2.4rem, 5vw, 3.4rem);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-text p {
    color: var(--text-muted);
    max-width: 520px;
    margin-bottom: 32px;
}

.cta-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
    background: var(--primary);
    color: #ffffff;
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.25);
}

.btn.primary:hover {
    transform: translateY(-2px);
}

.btn.secondary {
    border: 1px solid rgba(148, 163, 184, 0.45);
    color: var(--text);
}

.project-intro {
    padding: 80px 0 60px;
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.project-intro h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    display: inline-flex;
}

.project-content {
    max-width: 860px;
    margin: 0 auto;
    display: grid;
    gap: 18px;
    color: var(--text-muted);
}

.project-content p {
    margin: 0;
    text-align: justify;
    text-align-last: left;
    line-height: 1.75;
}

.section-heading {
    text-align: center;
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.section-heading h2 {
    font-size: 2.2rem;
    margin-bottom: 0;
}

.section-heading p {
    color: var(--text-muted);
    max-width: 760px;
}

.leaderboard {
    padding: 80px 0;
}

.table-wrapper {
    overflow-x: auto;
    background: var(--card);
    border-radius: 20px;
    border: 1px solid var(--border);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 840px;
}

th,
td {
    padding: 14px 18px;
    text-align: center;
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    font-size: 0.92rem;
}

th {
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    position: relative;
}

th:hover {
    color: var(--primary);
}

th.sort-asc::after,
th.sort-desc::after {
    content: '';
    position: absolute;
    right: 14px;
    border: 5px solid transparent;
}

th.sort-asc::after {
    top: 46%;
    border-bottom-color: var(--primary);
}

th.sort-desc::after {
    top: 46%;
    border-top-color: var(--primary);
}

tr:nth-child(even) {
    background: var(--bg-alt);
}

tr:nth-child(odd) {
    background: var(--table-row);
}

.method-cell {
    text-align: left;
    font-weight: 600;
}

.rank-pill {
    display: inline-block;
    min-width: 32px;
    padding: 3px 8px;
    border-radius: 999px;
    background: rgba(148, 163, 184, 0.25);
    font-size: 0.78rem;
}

.best {
    color: #0d5528;
    font-weight: 700;
}

.best .rank-pill {
    background: rgba(21, 128, 61, 0.3);
    color: #14532d;
}

.workflow {
    padding: 80px 0 70px;
    background: #ffffff;
}

.workflow-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    margin-bottom: 48px;
}

.workflow-grid article {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 24px 22px;
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
    text-align: left;
}

.workflow-grid h3 {
    font-size: 1.12rem;
    margin-bottom: 12px;
    color: var(--text);
}

.workflow-grid p {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.workflow-grid .metric {
    font-weight: 600;
    color: var(--primary);
    margin-top: 10px;
}

.workflow-summary {
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px 30px;
    background: var(--bg-alt);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.06);
    text-align: center;
}

.workflow-summary h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.workflow-summary p {
    color: var(--text-muted);
    max-width: 720px;
    margin: 0 auto;
}

.team {
    padding: 80px 0 100px;
}

.team-grid {
    display: grid;
    gap: 22px;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.member {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 28px 24px;
    text-align: center;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

.avatar {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    margin: 0 auto 16px;
    display: block;
    object-fit: cover;
    border: 2px solid rgba(37, 99, 235, 0.2);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12);
    background: var(--primary-soft);
}

.member h3 {
    margin-bottom: 10px;
    font-size: 1.08rem;
}

.member p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 24px 0 40px;
    text-align: center;
    color: var(--text-muted);
    background: #ffffff;
}

@media (max-width: 720px) {
    nav a {
        margin-left: 16px;
        font-size: 0.9rem;
    }

    th,
    td {
        padding: 12px;
        font-size: 0.88rem;
    }
}