/* Blue-and-white porcelain (青花瓷) theme
   Base: Pantone 11-4201 Cloud Dancer (2026 Color of the Year) — white ground
   Pattern/text: cobalt blue linework, echoing hand-painted porcelain borders */

@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap');

:root {
    --white: #ffffff;
    --porcelain-white: #ffffff;
    --porcelain-pale: #dbe9f2;
    --cobalt: #1d4f7f;
    --cobalt-mid: #4a7fab;
    --cobalt-mid-hover: #35618a;
    --border-light: #d7e4ec;
    --ink: #1c2b38;
    --ink-muted: #4a5d6b;
    --ink-faint: #6b7d89;
    --seal-red: #b5482f;

    --font: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

/* Base Styles */
body {
    font-family: var(--font);
    margin: 0;
    padding: 0;
    background-color: var(--white);
    color: var(--ink);
    line-height: 1.65;
    scroll-behavior: smooth;
}

h1, h2, h3 {
    font-family: var(--font);
    font-weight: 400;
    color: var(--cobalt);
}

/* Navigation Bar */
.navbar {
    background-color: var(--porcelain-white);
    color: var(--cobalt);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-light);
}

.lab-logo {
    font-family: var(--font);
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--cobalt);
}

.lab-logo a {
    color: inherit;
    text-decoration: none;
}

/* Top-Level Menu */
.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.nav-item {
    position: relative;
}

.nav-item a {
    display: block;
    font-family: var(--font);
    font-weight: 300;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--cobalt);
    text-decoration: none;
    padding: 1.2rem 1.5rem;
    transition: background 0.3s ease, color 0.3s ease;
}

.nav-item a:hover {
    background-color: var(--porcelain-pale);
    color: var(--cobalt-mid-hover);
}

/* Dropdown Submenu */
.dropdown {
    display: none;
    position: absolute;
    background-color: var(--porcelain-white);
    min-width: 220px;
    box-shadow: 0px 8px 16px 0px rgba(22,50,79,0.15);
    z-index: 1;
    list-style: none;
    padding: 0;
    margin: 0;
    top: 100%;
    left: 0;
    border-radius: 0 0 4px 4px;
    overflow: hidden;
}

.dropdown li a {
    font-family: var(--font);
    font-weight: 300;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--ink);
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-light);
}

.dropdown li a:hover {
    background-color: var(--porcelain-pale);
    color: var(--cobalt);
}

.dropdown li:last-child a {
    border-bottom: none;
}

/* Show dropdown on hover */
.nav-item:hover .dropdown {
    display: block;
}

/* Main Content */
.hero {
    background-color: var(--porcelain-white);
    padding: 4rem 2rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.6rem;
    margin-bottom: 1rem;
    color: var(--cobalt);
    letter-spacing: 0.3px;
}

.hero p {
    font-style: italic;
    color: var(--ink-muted);
    font-size: 1.1rem;
}

.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 2rem;
}

section {
    margin-bottom: 3rem;
    padding-top: 2rem;
}

/* Team Roster Styles */
.team-category {
    font-family: var(--font);
    margin-top: 2rem;
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 0.5rem;
    color: var(--cobalt);
}

.team-member {
    background: var(--porcelain-white);
    padding: 1.5rem;
    margin-top: 1rem;
    border-left: 3px solid var(--cobalt-mid);
    box-shadow: inset 0 0 0 1px var(--border-light), 0 2px 6px rgba(22,50,79,0.08);
    border-radius: 0 4px 4px 0;
}

.team-member strong {
    font-family: var(--font);
    font-size: 1.2rem;
    color: var(--cobalt);
}

.team-member p {
    margin: 0.5rem 0 0 0;
    color: var(--ink-muted);
}

/* Publications List Styles (populated by scripts/generate_publications.py) */
.pub-list {
    list-style-type: none;
    padding: 0;
    margin-top: 1.5rem;
}

.pub-list li {
    background: var(--porcelain-white);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 3px solid var(--cobalt);
    box-shadow: inset 0 0 0 1px var(--border-light), 0 2px 6px rgba(22,50,79,0.08);
    border-radius: 0 4px 4px 0;
}

.pub-list > li > strong {
    font-family: var(--font);
    color: var(--cobalt);
    font-size: 1.15rem;
    display: block;
    margin-bottom: 0.25rem;
}

.pub-list a {
    color: var(--cobalt-mid);
    text-decoration: none;
    font-weight: bold;
}

.pub-list a:hover {
    color: var(--cobalt-mid-hover);
    text-decoration: underline;
}

.pub-authors {
    color: var(--ink-muted);
    margin-bottom: 0.25rem;
}

.pub-venue {
    font-family: var(--font);
    font-style: italic;
    color: var(--cobalt);
}

.pub-status {
    color: var(--seal-red);
    font-weight: bold;
}

.pub-details {
    color: var(--ink-faint);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* Research Topics Styles */
.research-topic {
    background: var(--porcelain-white);
    padding: 1.5rem;
    margin-top: 1rem;
    border-left: 3px solid var(--cobalt-mid);
    box-shadow: inset 0 0 0 1px var(--border-light), 0 2px 6px rgba(22,50,79,0.08);
    border-radius: 0 4px 4px 0;
}

.research-topic h3 {
    margin-top: 0;
    color: var(--cobalt);
}

/* Placeholder Styles (Open-Source Software / Events) */
.effort-placeholder {
    background: var(--porcelain-white);
    padding: 1.5rem;
    border: 1px dashed var(--porcelain-pale);
    border-radius: 4px;
    color: var(--ink-faint);
}

.effort-placeholder ul {
    margin: 0.75rem 0 0 1.25rem;
    padding: 0;
}

/* Join Us Block Styles */
.join-block {
    background: var(--porcelain-white);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-light);
    border-radius: 4px;
}

.join-block h3 {
    margin-top: 0;
    color: var(--cobalt);
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--porcelain-white);
    color: var(--ink-muted);
    font-family: var(--font);
    font-style: italic;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    border-top: 1px solid var(--border-light);
}