/* SIAM Student Chapter — Purdue University
   Purdue-inspired brand palette:
   - Boilermaker Gold:  #CFB991
   - Black:             #000000
   - Rush (deep gold):  #8E6F3E
   - Field (bright):    #DAAA00
   - Steel Gray:        #555960
   - Cool Gray:         #6F727B
*/

:root {
    --pu-gold: #CFB991;
    --pu-gold-dark: #8E6F3E;
    --pu-gold-bright: #DAAA00;
    --pu-black: #000000;
    --pu-steel: #555960;
    --pu-cool: #6F727B;
    --pu-light: #F4F2ED;
    --pu-bg: #ffffff;
    --pu-page: #fafaf7;
    --text: #1a1a1a;
    --text-muted: #4a4a4a;
    --border: #e5e3dd;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI",
                 "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--pu-page);
    -webkit-font-smoothing: antialiased;
}

.display-font {
    font-family: "Archivo Narrow", "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
}

a { color: var(--pu-black); }
a:hover { text-decoration: underline; }

/* ---------- Top Brand Bar (Purdue-style black bar) ---------- */
.brandbar {
    background: var(--pu-black);
    color: #fff;
    padding: 10px 0;
    font-size: 0.85em;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.brandbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.brandbar a {
    color: #fff;
    text-decoration: none;
    font-weight: 600;
}
.brandbar a:hover { color: #e6e6e6; text-decoration: none; }
.brandbar .pu-wordmark {
    display: flex;
    align-items: center;
    gap: 10px;
}
.brandbar .pu-wordmark img {
    height: 28px;
    width: auto;
}

/* ---------- Header: white with two logos, gold accent ---------- */
header.site-header {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 28px 20px 26px;
}
.header-inner {
    max-width: 1320px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}
.header-logos {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: nowrap;
    flex-shrink: 0;
}
.header-logos img {
    display: block;
    width: auto;
}
.header-logos .logo-purdue { height: 52px; }
.header-logos .logo-siam   { height: 36px; }
.header-logos .logo-divider {
    width: 1px;
    height: 38px;
    background: var(--border);
}
.header-titles {
    text-align: right;
    margin-left: auto;
}
.header-titles h1 {
    font-family: "Archivo Narrow", "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
    color: var(--pu-black);
    font-size: 1.95em;
    font-weight: 700;
    letter-spacing: 0.025em;
    text-transform: uppercase;
    line-height: 1.1;
    white-space: nowrap;
}
.header-titles h1 .at {
    color: var(--pu-gold-dark);
    font-weight: 500;
    margin: 0 0.05em;
}
.header-titles .sub {
    color: var(--pu-steel);
    font-size: 1.02em;
    margin-top: 6px;
    letter-spacing: 0.02em;
}

@media (max-width: 1200px) {
    .header-inner { gap: 24px; }
    .header-logos .logo-purdue { height: 46px; }
    .header-logos .logo-siam { height: 32px; }
    .header-logos .logo-divider { height: 34px; }
    .header-titles h1 { font-size: 1.75em; }
}

/* ---------- Primary Navigation ---------- */
nav.primary {
    background: var(--pu-black);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
nav.primary ul {
    max-width: 1200px;
    margin: 0 auto;
    list-style: none;
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;
    padding: 0 10px;
}
nav.primary ul li { position: relative; }
nav.primary ul li a {
    display: block;
    padding: 16px 22px;
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95em;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border-bottom: 3px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
nav.primary ul li a:hover,
nav.primary ul li a.active {
    color: var(--pu-gold);
    border-bottom-color: transparent;
    background: #111;
    text-decoration: none;
}
.dropdown-content {
    display: none;
    position: absolute;
    background: var(--pu-black);
    min-width: 220px;
    box-shadow: 0 8px 18px rgba(0,0,0,0.25);
    top: 100%;
    left: 0;
    z-index: 10;
    border-top: 1px solid rgba(255,255,255,0.2);
}
.dropdown-content a {
    padding: 12px 20px;
    display: block;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    text-transform: none;
    letter-spacing: 0;
}
.dropdown-content a:hover { background: #111; color: #fff; }
.dropdown:hover .dropdown-content { display: block; }
.dropdown > a::after { content: ' ▾'; font-size: 0.75em; }

/* ---------- Intro (clean, light homepage lede) ---------- */
.intro {
    background: #fff;
    padding: 56px 20px 48px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.intro-inner { max-width: 820px; margin: 0 auto; }
.intro-lede {
    font-size: 1.2em;
    line-height: 1.6;
    color: var(--text);
}
.intro-cta {
    margin-top: 28px;
    display: inline-flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
}
.btn-outline-dark {
    border-color: var(--pu-black);
    color: var(--pu-black);
}
.btn-outline-dark:hover { background: var(--pu-black); color: #fff; text-decoration: none; }
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 2px;
    font-weight: 700;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.88em;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
    border: 2px solid transparent;
}
.btn-gold { background: var(--pu-black); color: #fff; }
.btn-gold:hover { background: #1a1a1a; text-decoration: none; }
.btn-outline { border-color: var(--pu-black); color: var(--pu-black); }
.btn-outline:hover { background: var(--pu-black); color: #fff; text-decoration: none; }

/* ---------- Content containers ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
}

.page-title {
    text-align: center;
    font-size: 2.3em;
    color: var(--pu-black);
    font-weight: 700;
    margin-bottom: 10px;
}
.page-title::after {
    content: none;
}
.page-subtitle {
    text-align: center;
    font-size: 1.1em;
    color: var(--pu-steel);
    margin-bottom: 50px;
}

.section-title {
    text-align: center;
    font-size: 1.9em;
    color: var(--pu-black);
    font-weight: 700;
    margin-bottom: 36px;
}
.section-title::after {
    content: none;
}

/* ---------- Cards (generic) ---------- */
.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 28px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.04);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 22px rgba(0,0,0,0.08);
}

/* ---------- About (homepage) ---------- */
.about-section {
    background: transparent;
    border: none;
    padding: 0 0 24px;
    margin: 0 auto 34px;
    max-width: 980px;
}
.about-section h2 {
    color: var(--pu-black);
    font-size: 2em;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: 0.01em;
}
.about-section h2::after {
    content: none;
}
.about-section p {
    font-size: 1.12em;
    color: var(--text-muted);
    line-height: 1.75;
    max-width: 70ch;
}

/* ---------- Intro split (homepage hero) ---------- */
.intro-split {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 56px;
    align-items: start;
    padding: 10px 0 56px;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border);
}
.eyebrow {
    display: inline-block;
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--pu-gold-dark);
    margin-bottom: 14px;
}
.intro-who h2 {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 2.4em;
    line-height: 1.15;
    font-weight: 700;
    color: var(--pu-black);
    margin-bottom: 18px;
    letter-spacing: -0.005em;
}
.intro-who h2::after { content: none; }
.intro-who p {
    font-size: 1.08em;
    color: var(--text-muted);
    line-height: 1.75;
    margin-bottom: 14px;
}
.intro-who .intro-meta {
    font-size: 0.95em;
    color: var(--pu-cool);
    padding-top: 14px;
    border-top: 1px solid var(--border);
    margin-top: 4px;
}
.activities-head { margin-bottom: 18px; }
.activities-head h3 {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 1.5em;
    font-weight: 700;
    color: var(--pu-black);
    letter-spacing: 0.01em;
}
.activity-list {
    list-style: none;
    display: flex;
    flex-direction: column;
}
.activity-list li {
    border-top: 1px solid var(--border);
}
.activity-list li:last-child {
    border-bottom: 1px solid var(--border);
}
.activity {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 20px 4px 20px 0;
    text-decoration: none;
    color: var(--text);
    transition: padding 0.25s ease, color 0.2s ease;
}
.activity:hover {
    padding-left: 10px;
    text-decoration: none;
}
.activity-index {
    flex-shrink: 0;
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 0.9em;
    font-weight: 700;
    color: var(--pu-gold-dark);
    letter-spacing: 0.1em;
    min-width: 28px;
}
.activity-body { flex: 1; }
.activity-body h4 {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 1.35em;
    font-weight: 700;
    color: var(--pu-black);
    margin-bottom: 4px;
    line-height: 1.2;
}
.activity-body p {
    font-size: 0.98em;
    color: var(--pu-steel);
    line-height: 1.55;
    margin: 0;
}
.activity-arrow {
    flex-shrink: 0;
    font-size: 1.2em;
    font-weight: 700;
    color: var(--pu-cool);
    transition: transform 0.25s ease, color 0.2s ease;
}
.activity:hover .activity-body h4 { color: var(--pu-gold-dark); }
.activity:hover .activity-arrow {
    color: var(--pu-gold-dark);
    transform: translateX(6px);
}

@media (max-width: 900px) {
    .intro-split {
        grid-template-columns: 1fr;
        gap: 36px;
        padding-bottom: 36px;
    }
    .intro-who h2 { font-size: 2em; }
}

/* ---------- Conference page (editorial layout) ---------- */
.conf-hero {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 64px;
    align-items: start;
    padding: 16px 0 56px;
    margin-bottom: 48px;
    border-bottom: 1px solid var(--border);
}
.conf-hero-left .eyebrow { margin-bottom: 18px; }
.conf-title {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 3.1em;
    line-height: 1.08;
    font-weight: 700;
    color: var(--pu-black);
    letter-spacing: -0.01em;
    margin-bottom: 22px;
}
.conf-lede {
    font-size: 1.18em;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 620px;
}
.conf-status {
    display: inline-block;
    font-size: 0.95em;
    color: var(--pu-steel);
    padding: 10px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin-bottom: 22px;
}
.conf-hero-cta .link-arrow {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 1.05em;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--pu-black);
    text-decoration: none;
    border-bottom: 2px solid var(--pu-gold);
    padding-bottom: 4px;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.conf-hero-cta .link-arrow:hover {
    color: var(--pu-gold-dark);
    border-bottom-color: var(--pu-gold-dark);
    text-decoration: none;
}
.conf-hero-cta .link-arrow span {
    display: inline-block;
    margin-left: 6px;
    transition: transform 0.2s ease;
}
.conf-hero-cta .link-arrow:hover span { transform: translateX(4px); }

.conf-hero-right {
    border-top: 2px solid var(--pu-black);
    padding-top: 8px;
}
.conf-meta-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    align-items: baseline;
}
.conf-meta-label {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--pu-cool);
}
.conf-meta-value {
    font-size: 1.05em;
    color: var(--pu-black);
    line-height: 1.45;
    font-weight: 600;
}

.conf-section {
    padding: 36px 0;
    border-bottom: 1px solid var(--border);
}
.conf-section-head { margin-bottom: 22px; }
.conf-section-head .eyebrow { margin-bottom: 10px; }
.conf-section-head h2 {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 2em;
    font-weight: 700;
    color: var(--pu-black);
    line-height: 1.18;
    letter-spacing: -0.005em;
}
.conf-section-head h2::after { content: none; }
.conf-prose p {
    font-size: 1.08em;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 14px;
    max-width: 760px;
}

.conf-format {
    display: flex;
    flex-direction: column;
}
.conf-format > div {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 32px;
    padding: 22px 0;
    border-top: 1px solid var(--border);
    align-items: baseline;
}
.conf-format > div:last-child { border-bottom: 1px solid var(--border); }
.conf-format dt {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 1.35em;
    font-weight: 700;
    color: var(--pu-black);
    letter-spacing: 0.005em;
}
.conf-format dd {
    font-size: 1.02em;
    color: var(--pu-steel);
    line-height: 1.65;
    margin: 0;
}

.conf-contact {
    padding: 40px 0 60px;
}
.conf-contact .eyebrow { margin-bottom: 10px; }
.conf-contact p {
    font-size: 1.08em;
    color: var(--text-muted);
}

@media (max-width: 900px) {
    .conf-hero {
        grid-template-columns: 1fr;
        gap: 32px;
        padding-bottom: 36px;
    }
    .conf-title { font-size: 2.3em; }
    .conf-format > div { grid-template-columns: 1fr; gap: 8px; }
    .conf-meta-row { grid-template-columns: 110px 1fr; }
}

/* ---------- Past Conferences list ---------- */
.past-conferences {
    list-style: none;
    padding: 0;
    margin: 0;
}
.past-conferences li {
    border-top: 1px solid var(--border);
}
.past-conferences li:last-child {
    border-bottom: 1px solid var(--border);
}
.past-conferences a {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 16px 4px;
    text-decoration: none;
    color: var(--text);
    transition: padding 0.2s ease, color 0.2s ease;
}
.past-conferences a:hover {
    padding-left: 10px;
    text-decoration: none;
}
.past-conferences .pc-year {
    font-family: "Archivo Narrow", "Arial Narrow", Arial, sans-serif;
    font-size: 1.5em;
    font-weight: 700;
    color: var(--pu-black);
    min-width: 72px;
}
.past-conferences .pc-label {
    flex: 1;
    color: var(--pu-steel);
    font-size: 1em;
}
.past-conferences .pc-arrow {
    color: var(--pu-gold-dark);
    font-weight: 700;
    font-size: 1.15em;
    transition: transform 0.2s ease;
}
.past-conferences a:hover .pc-year { color: var(--pu-gold-dark); }
.past-conferences a:hover .pc-arrow { transform: translateX(5px); }

/* ---------- Quick-links grid (homepage) ---------- */
.quicklinks {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 34px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    margin-bottom: 60px;
}
.quicklink {
    background: transparent;
    border: none;
    padding: 0;
    text-decoration: none;
    color: var(--text);
    transition: color 0.2s ease;
}
.quicklink:hover {
    text-decoration: none;
}
.quicklink + .quicklink {
    border-left: 1px solid var(--border);
    padding-left: 34px;
}
.quicklink h3 {
    color: var(--pu-black);
    font-size: 1.55em;
    font-family: "Archivo Narrow", "Franklin Gothic Medium", "Arial Narrow", Arial, sans-serif;
    font-weight: 700;
    line-height: 1.12;
    margin-bottom: 10px;
}
.quicklink p {
    color: var(--pu-steel);
    font-size: 1.04em;
    line-height: 1.65;
    margin-bottom: 10px;
}
.quicklink .arrow {
    color: var(--pu-black);
    font-weight: 700;
    margin-top: 12px;
    display: inline-block;
    letter-spacing: 0.08em;
    font-size: 0.8em;
    text-transform: uppercase;
}
.quicklink:hover .arrow { color: var(--pu-gold-dark); }

@media (max-width: 980px) {
    .quicklinks {
        grid-template-columns: 1fr;
        gap: 18px;
        padding-top: 18px;
    }
    .quicklink + .quicklink {
        border-left: none;
        border-top: 1px solid var(--border);
        padding-left: 0;
        padding-top: 18px;
    }
}

/* ---------- Officers grid ---------- */
.officers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 26px;
}
.officer-card {
    background: #fff;
    border: 1px solid var(--border);
    padding: 26px 20px;
    text-align: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.officer-card:hover {
    transform: translateY(-5px);
    border-color: var(--border);
    box-shadow: 0 10px 22px rgba(0,0,0,0.08);
}
.officer-photo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    margin: 0 auto 18px;
    overflow: hidden;
    border: 2px solid var(--border);
    background: var(--pu-light);
}
.officer-photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.officer-name {
    font-size: 1.15em;
    font-weight: 700;
    color: var(--pu-black);
    margin-bottom: 4px;
}
.officer-position {
    color: var(--pu-steel);
    font-weight: 600;
    font-size: 0.92em;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* ---------- Event cards ---------- */
.event-card {
    background: #fff;
    border: 1px solid var(--border);
    padding: 28px 30px;
    margin-bottom: 24px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.04);
}
.event-card h3 {
    font-size: 1.45em;
    color: var(--pu-black);
    margin-bottom: 14px;
    font-weight: 700;
}
.event-details {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 16px;
}
.event-detail-item { color: var(--text-muted); font-size: 0.98em; }
.event-detail-item strong { color: var(--pu-black); }
.event-description { color: var(--text-muted); line-height: 1.8; }
.event-description a { color: var(--pu-black); font-weight: 600; }

.label {
    display: inline-block;
    background: var(--pu-black);
    color: #fff;
    padding: 4px 14px;
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 14px;
}
.label.upcoming { background: #1f1f1f; color: #fff; }
.label.past    { background: var(--pu-cool); color: #fff; }

/* ---------- Info sections (conference pages) ---------- */
.info-section {
    background: #fff;
    border: 1px solid var(--border);
    padding: 34px 36px;
    margin-bottom: 24px;
}
.info-section h3 {
    font-size: 1.45em;
    color: var(--pu-black);
    margin-bottom: 18px;
    padding-bottom: 0;
    border-bottom: none;
    font-weight: 700;
}
.info-section p {
    color: var(--text-muted);
    margin-bottom: 12px;
    font-size: 1.03em;
}
.info-section ul { margin-left: 22px; color: var(--text-muted); }
.info-section ul li { margin-bottom: 8px; }

.highlight-box {
    background: var(--pu-light);
    border-left: 3px solid var(--pu-cool);
    padding: 16px 20px;
    margin: 18px 0;
}
.highlight-box strong { color: var(--pu-black); }

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
    margin-top: 20px;
}
.column-card {
    background: var(--pu-light);
    padding: 26px;
    border: 1px solid var(--border);
}
.column-card h4 {
    font-size: 1.2em;
    color: var(--pu-black);
    margin-bottom: 10px;
    font-weight: 700;
}
.column-card p { color: var(--text-muted); }

/* ---------- Conference hero ---------- */
.conference-hero {
    background: linear-gradient(135deg, #000 0%, #2b2b2b 100%);
    color: #fff;
    padding: 54px 40px;
    text-align: center;
    margin-bottom: 40px;
    border-bottom: none;
}
.conference-hero h2 {
    font-size: 2em;
    margin-bottom: 18px;
    color: #fff;
    font-weight: 700;
}
.conference-hero h2 .accent { color: #fff; }
.conference-hero p {
    font-size: 1.15em;
    margin-bottom: 6px;
    color: #e8e8e8;
}

/* ---------- Schedule items ---------- */
.schedule-section {
    background: #fff;
    border: 1px solid var(--border);
    padding: 32px 36px;
    margin-bottom: 24px;
}
.schedule-section > h2 {
    color: var(--pu-black);
    font-size: 1.7em;
    margin-bottom: 24px;
    padding-bottom: 0;
    border-bottom: none;
    font-weight: 700;
}
.schedule-item {
    border-left: 3px solid var(--pu-cool);
    background: var(--pu-light);
    padding: 18px 22px;
    margin-bottom: 14px;
}
.schedule-item .time {
    font-weight: 700;
    color: var(--pu-steel);
    margin-bottom: 6px;
    font-size: 0.95em;
    letter-spacing: 0.04em;
}
.schedule-item h3 {
    color: var(--pu-black);
    font-size: 1.12em;
    margin-bottom: 6px;
    font-weight: 700;
}
.schedule-item .speaker {
    color: var(--pu-steel);
    font-weight: 600;
    margin-bottom: 6px;
}
.schedule-item .topic {
    display: inline-block;
    background: var(--pu-black);
    color: #fff;
    padding: 2px 10px;
    font-size: 0.75em;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.schedule-item p { color: var(--text-muted); margin-top: 6px; }
.break-item {
    background: #fbf7ec;
    border-left-color: var(--border);
    text-align: center;
}
.break-item .time { color: var(--pu-steel); }

/* ---------- Speaker section ---------- */
.speaker-section {
    background: #fff;
    border: 1px solid var(--border);
    padding: 32px 36px;
    margin-bottom: 24px;
}
.speaker-section h2 {
    color: var(--pu-black);
    font-size: 1.7em;
    margin-bottom: 20px;
    font-weight: 700;
    border-bottom: none;
    padding-bottom: 0;
}
.speaker-info { padding-top: 8px; }
.speaker-info h3 {
    color: var(--pu-black);
    font-size: 1.35em;
    margin-bottom: 6px;
    font-weight: 700;
}
.speaker-info h4 {
    color: var(--pu-steel);
    font-size: 1em;
    font-weight: 600;
    margin-bottom: 14px;
}
.speaker-info p { color: var(--text-muted); line-height: 1.8; margin-bottom: 10px; }

.conference-photo {
    max-width: 1000px;
    margin: 0 auto 40px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 6px 16px rgba(0,0,0,0.08);
}
.conference-photo img { width: 100%; height: auto; display: block; }
.conference-photo figcaption {
    background: var(--pu-light);
    padding: 14px 18px;
    text-align: center;
    color: var(--pu-steel);
    font-style: italic;
}

/* ---------- Social page extras ---------- */
.upcoming-section {
    background: var(--pu-light);
    padding: 36px;
    margin-bottom: 50px;
    border: 1px solid var(--border);
}
.upcoming-section h2 {
    text-align: center;
    font-size: 1.7em;
    color: var(--pu-black);
    margin-bottom: 24px;
    font-weight: 700;
}
.upcoming-event {
    background: #fff;
    padding: 24px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
}
.upcoming-event h4 {
    font-size: 1.25em;
    color: var(--pu-black);
    margin-bottom: 10px;
    font-weight: 700;
}
.upcoming-event p { color: var(--text-muted); margin: 4px 0; }
.rsvp-button {
    display: inline-block;
    background: var(--pu-black);
    color: #fff;
    padding: 10px 24px;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.85em;
    margin-top: 14px;
    border: 2px solid var(--pu-black);
    transition: background 0.2s ease, color 0.2s ease;
}
.rsvp-button:hover { background: #1a1a1a; color: #fff; text-decoration: none; }

.past-event-highlight {
    max-width: 900px;
    margin: 0 auto;
    background: #fff;
    border: 1px solid var(--border);
    overflow: hidden;
}
.past-event-highlight img { width: 100%; display: block; }
.past-event-caption { padding: 20px; text-align: center; }
.past-event-caption h3 {
    color: var(--pu-black);
    margin-bottom: 6px;
    font-weight: 700;
}
.past-event-caption p { color: var(--pu-steel); }

.photo-gallery { margin-top: 40px; }
.photo-gallery h2 {
    font-size: 1.7em;
    color: var(--pu-black);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 700;
}

/* ---------- Footer ---------- */
footer.site-footer {
    background: var(--pu-black);
    color: #d8d8d8;
    padding: 16px 20px;
    border-top: none;
    margin-top: 60px;
}
.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
    padding-bottom: 24px;
    border-bottom: 1px solid #2a2a2a;
}
.footer-col h4 {
    color: #fff;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 14px;
    font-weight: 700;
}
.footer-col p, .footer-col a {
    color: #cfcfcf;
    font-size: 0.95em;
    text-decoration: none;
    display: block;
    margin: 4px 0;
}
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-logos {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.footer-logos img { height: 36px; width: auto; }
.footer-logos img.logo-siam { filter: brightness(0) invert(1); opacity: 0.9; }
.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: #bdbdbd;
    font-size: 0.88em;
}
.footer-bottom a { color: #fff; text-decoration: none; }
.footer-bottom a:hover { text-decoration: underline; }

/* ---------- Responsive ---------- */
@media (max-width: 780px) {
    .header-inner {
        flex-direction: column;
        justify-content: center;
        gap: 14px;
        text-align: center;
    }
    .header-titles { text-align: center; margin-left: 0; }
    .header-titles h1 { font-size: 1.45em; white-space: normal; }
    .header-titles .sub { font-size: 0.95em; }
    .header-logos { justify-content: center; }
    .header-logos .logo-purdue { height: 42px; }
    .header-logos .logo-siam { height: 28px; }
    .header-logos .logo-divider { height: 30px; }
    .hero h1 { font-size: 2.1em; }
    nav.primary ul { justify-content: center; }
    nav.primary ul li a { padding: 14px 14px; font-size: 0.88em; }
    .brandbar-inner { justify-content: center; text-align: center; flex-direction: column; }
    .about-section, .info-section, .schedule-section,
    .speaker-section, .upcoming-section, .event-card { padding: 24px 20px; }
}