body {
    min-height: 100%;
    padding-top: 0;
    padding-left: 20px;
    padding-right: 20px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.6;
}

/* Logo banner at the top */
.logo-banner {
    padding: 15px 0 10px 0;
}

/* Navigation */
.navbar {
    padding-top: 0;
    padding-bottom: 0;
    margin-bottom: 8px;
    border-bottom: 1px solid #e0e0e0;
}

.navbar-brand {
    color: #3a879c;
    font-size: 22px;
}

a {
    color: #4b8e9d;
    font-weight: bold;
    text-decoration: none;
}

a:hover,
a:focus {
    color: #615ddb;
    text-decoration: none;
}

/* Section headings */
.row > h2 {
    font-size: large;
    font-weight: bold;
}

/* Title area */
h1.citc-title {
    color: #3a879c;
    font-size: 28px;
    margin-bottom: 2px;
}

h1.citc-title::after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background-color: #3a879c;
    margin-top: 8px;
    border-radius: 2px;
}

h2.citc-subtitle {
    color: #555;
    font-size: 20px;
    font-weight: normal;
    margin-top: 12px;
    margin-bottom: 20px;
}

/* Hero section with tinted background */
.hero-section {
    background-color: #f7f6f3;
    margin-left: -20px;
    margin-right: -20px;
    padding: 25px 20px 15px 20px;
    margin-bottom: 10px;
}

/* Hero image */
.hero-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 10px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

/* Content sections - more breathing room */
.content-section {
    padding-top: 20px;
    padding-bottom: 10px;
}

/* Schedule table */
.schedule-table {
    width: 100%;
    max-width: 600px;
}

.schedule-table th {
    background-color: #3a879c;
    color: white;
    padding: 8px 12px;
}

.schedule-table td {
    padding: 8px 12px;
    border-bottom: 1px solid #ddd;
}

.schedule-table tr:nth-child(even) td {
    background-color: #f8f9fa;
}

/* Talk sections */
.talk-block {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed #bbbbbb;
}

.talk-block:last-child {
    border-bottom: none;
}

.talk-title {
    font-weight: bold;
    font-size: 17px;
    color: #3a879c;
}

.speaker-name {
    font-weight: bold;
}

.speaker-affiliation {
    font-style: italic;
    color: #666;
}

.speaker-bio {
    margin-top: 8px;
    font-size: 15px;
    color: #555;
}

/* Participant list */
.participant-list {
    list-style: none;
    padding-left: 0;
    columns: 2;
    -webkit-columns: 2;
    -moz-columns: 2;
}

.participant-list li {
    padding: 3px 0;
    break-inside: avoid;
}

.participant-list .affiliation {
    font-style: italic;
    color: #666;
    font-size: 14px;
}

/* Navbar active style */
.navbar-default .navbar-nav > .active > a,
.navbar-default .navbar-nav > .active > a:focus,
.navbar-default .navbar-nav > .active > a:hover {
    background-color: white;
    color: #126162;
    padding: 15px 15px 3px 15px;
    box-shadow: 0px 2px 0px;
    -webkit-transition: 200ms ease;
    transition: 200ms ease;
}

/* Dark mode toggle - small and subtle at bottom */
#dark-mode-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 4px 8px;
    line-height: 1;
    border-radius: 50%;
    transition: background-color 0.2s ease;
    opacity: 0.5;
}
#dark-mode-toggle:hover {
    background-color: rgba(0, 0, 0, 0.08);
    opacity: 1;
}

.footer-bar {
    margin-top: 40px;
    padding: 15px 0;
    border-top: 1px solid #e0e0e0;
    text-align: right;
}

/* Dark mode styles */
body.dark-mode {
    background-color: #1a1a2e;
    color: #d4d4d4;
}
body.dark-mode .navbar {
    border-bottom-color: #333;
}
body.dark-mode .navbar-brand {
    color: #6dd4e4;
}
body.dark-mode a {
    color: #6dd4e4;
}
body.dark-mode a:hover,
body.dark-mode a:focus {
    color: #a09cf0;
}
body.dark-mode .nav-link {
    color: #d4d4d4;
}
body.dark-mode .nav-link:hover {
    color: #6dd4e4;
}
body.dark-mode h1.citc-title {
    color: #6dd4e4;
}
body.dark-mode h1.citc-title::after {
    background-color: #6dd4e4;
}
body.dark-mode h2.citc-subtitle {
    color: #aaa;
}
body.dark-mode .hero-section {
    background-color: #151530;
}
body.dark-mode .hero-image {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}
body.dark-mode .speaker-affiliation,
body.dark-mode .speaker-bio {
    color: #aaa;
}
body.dark-mode .participant-list .affiliation {
    color: #999;
}
body.dark-mode .talk-title {
    color: #6dd4e4;
}
body.dark-mode .schedule-table th {
    background-color: #2a6a7a;
}
body.dark-mode .schedule-table td {
    border-bottom-color: #444;
}
body.dark-mode .schedule-table tr:nth-child(even) td {
    background-color: #1f1f3a;
}
body.dark-mode .talk-block {
    border-bottom-color: #444;
}
body.dark-mode .footer-bar {
    border-top-color: #333;
}
body.dark-mode #dark-mode-toggle {
    color: #d4d4d4;
}
body.dark-mode #dark-mode-toggle:hover {
    background-color: rgba(255, 255, 255, 0.12);
}