body {
    color: #25313b;
}

a {
    color: #096b73;
}

a:hover,
a:focus {
    color: #0f8f7f;
}

.intro-header {
    min-height: 68vh;
    height: auto;
    padding: 86px 0 72px;
    display: flex;
    align-items: center;
    background: linear-gradient(90deg, rgba(10, 15, 18, 0.78), rgba(10, 15, 18, 0.36)),
        url(../img/hero-trustworthy-agents.jpg) no-repeat center center;
    background-size: cover;
    text-align: left;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.conference-label {
    margin: 0 0 18px;
    color: #f2c14e;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0;
    text-transform: uppercase;
}

.h1_home {
    max-width: 980px;
    margin: 0;
    font-size: 54px;
    line-height: 1.08;
    letter-spacing: 0;
    font-family: Arvo, Georgia, serif;
    font-weight: 700;
    color: #ffffff;
    text-shadow: 0 3px 18px rgba(0, 0, 0, 0.52);
}

.hero-subtitle {
    max-width: 760px;
    margin: 22px 0 0;
    color: #eef7f4;
    font-size: 22px;
    line-height: 1.45;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.55);
}

.hero-tagline {
    max-width: 860px;
    margin: 18px 0 0;
    color: #ffffff;
    font-size: 21px;
    line-height: 1.45;
    font-weight: 400;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.55);
}

.hero-links {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-links a {
    display: inline-flex;
    align-items: center;
    min-height: 42px;
    padding: 9px 18px;
    border: 1px solid rgba(255, 255, 255, 0.74);
    color: #ffffff;
    background: rgba(13, 99, 93, 0.42);
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s ease;
}

.hero-links a:hover,
.hero-links a:focus {
    background: rgba(242, 193, 78, 0.9);
    border-color: rgba(242, 193, 78, 0.95);
    color: #172126;
    text-decoration: none;
}

.navbar-default {
    background: #25313b;
    border: 0;
}

.navbar-default .navbar-toggle {
    border-color: rgba(255, 255, 255, 0.35);
}

.navbar-default .navbar-toggle .icon-bar {
    background-color: #ffffff;
}

.navbar-default .navbar-toggle:hover,
.navbar-default .navbar-toggle:focus {
    background-color: #31424f;
}

.navbar-default .navbar-nav > li > a {
    color: #f7fbfb;
    font-weight: 700;
}

.navbar-default .navbar-nav > li > a:hover,
.navbar-default .navbar-nav > li > a:focus {
    color: #f2c14e;
}

.content-section-a,
.content-section-b {
    padding: 76px 0;
}

.content-section-a {
    background-color: #f7f9f8;
}

.content-section-b {
    background-color: #ffffff;
}

.section-heading {
    margin-top: 0;
    margin-bottom: 24px;
    color: #25313b;
    font-family: Arvo, Georgia, serif;
    letter-spacing: 0;
}

.lead {
    font-size: 17px;
    line-height: 1.75;
}

.pillar-grid {
    margin-top: 46px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.pillar-card {
    min-height: 220px;
    padding: 26px;
    background: #ffffff;
    border-top: 4px solid #f2c14e;
    box-shadow: 0 10px 26px rgba(37, 49, 59, 0.08);
}

.pillar-number {
    color: #0f8f7f;
    font-size: 14px;
    font-weight: 900;
}

.pillar-card h3 {
    margin-top: 12px;
    margin-bottom: 12px;
    color: #25313b;
    font-weight: 700;
}

.pillar-card p {
    margin: 0;
    line-height: 1.6;
}

.schedule-note {
    max-width: 760px;
}

.program-table {
    background: #ffffff;
    box-shadow: 0 10px 26px rgba(37, 49, 59, 0.08);
}

.program-table th {
    font-size: 15px;
    text-transform: uppercase;
}

.program-table td,
.program-table th {
    vertical-align: middle !important;
    padding: 14px 16px !important;
}

.program-table .info th {
    background-color: #d9efea;
    border-color: #c4ddd7;
    color: #25313b;
}

.program-table .success td {
    background-color: #eef7f3;
}

.organizer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}

.organizer-card {
    display: grid;
    grid-template-columns: 132px 1fr;
    gap: 22px;
    min-height: 260px;
    padding: 26px;
    background: #f7f9f8;
    box-shadow: 0 10px 26px rgba(37, 49, 59, 0.08);
}

.organizer-photo {
    width: 132px;
    height: 132px;
    object-fit: cover;
    object-position: center top;
    border-radius: 50%;
    border: 4px solid #ffffff;
    box-shadow: 0 8px 18px rgba(37, 49, 59, 0.16);
}

.organizer-copy h3 {
    margin-top: 0;
    margin-bottom: 6px;
    font-size: 21px;
}

.organizer-copy h3 a {
    color: #25313b;
}

.organizer-copy h3 a:hover,
.organizer-copy h3 a:focus {
    color: #096b73;
}

.affiliation {
    margin-bottom: 12px;
    color: #0f8f7f;
    font-weight: 700;
}

.organizer-copy p {
    line-height: 1.62;
}

.materials-list {
    margin: 0;
    padding: 0;
    list-style: none;
    background: #ffffff;
    box-shadow: 0 10px 26px rgba(37, 49, 59, 0.08);
}

.materials-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 18px 22px;
    border-bottom: 1px solid #e3ece9;
}

.materials-list li:last-child {
    border-bottom: 0;
}

.materials-list span {
    font-weight: 700;
}

.materials-list strong {
    color: #75828a;
}

.content-section-c {
    padding: 76px 0;
    background: #25313b;
    border: 0;
}

.contact-heading,
.contact-line {
    color: #ffffff;
}

.contact-line a {
    color: #f2c14e;
}

.contact-line a:hover,
.contact-line a:focus {
    color: #ffffff;
}

footer {
    padding: 24px 0;
    background: #172126;
    color: #dce6e3;
    text-align: center;
}

footer p {
    margin: 0;
}

@media (max-width: 991px) {
    .intro-header {
        min-height: 62vh;
        padding: 72px 0 60px;
    }

    .h1_home {
        font-size: 42px;
    }

    .hero-subtitle {
        font-size: 19px;
    }

    .hero-tagline {
        font-size: 18px;
    }

    .pillar-grid,
    .organizer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 767px) {
    .intro-header {
        min-height: 58vh;
        padding: 56px 0 46px;
    }

    .h1_home {
        font-size: 32px;
        line-height: 1.14;
    }

    .hero-subtitle {
        font-size: 17px;
    }

    .hero-tagline {
        font-size: 16px;
    }

    .content-section-a,
    .content-section-b,
    .content-section-c {
        padding: 52px 0;
    }

    .pillar-grid,
    .organizer-grid {
        grid-template-columns: 1fr;
    }

    .pillar-card {
        min-height: 0;
    }

    .organizer-card {
        grid-template-columns: 1fr;
        min-height: 0;
    }

    .organizer-photo {
        width: 118px;
        height: 118px;
    }

    .materials-list li {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }

    .contact-line {
        word-break: break-word;
    }
}

@media (max-width: 420px) {
    .h1_home {
        font-size: 28px;
    }

    .hero-links a {
        width: 100%;
        justify-content: center;
    }
}

/* ===== Final visual polish for KDD tutorial website ===== */

/* Hero: more polished depth without changing layout */
.intro-header {
    position: relative;
    overflow: hidden;
}

.intro-header::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 18% 24%, rgba(242, 193, 78, 0.22), transparent 28%),
        radial-gradient(circle at 78% 42%, rgba(15, 143, 127, 0.24), transparent 34%),
        linear-gradient(90deg, rgba(10, 15, 18, 0.30), rgba(10, 15, 18, 0.06));
    pointer-events: none;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

/* Hero buttons: more premium / conference-landing-page style */
.hero-links a {
    border-radius: 999px;
    padding: 11px 21px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.66);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
}

.hero-links a:hover,
.hero-links a:focus {
    transform: translateY(-2px);
    background: #f2c14e;
    border-color: #f2c14e;
    color: #172126;
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.24);
}

/* Cards and tables: softer, modern, more polished */
.pillar-card,
.organizer-card,
.materials-list,
.program-table {
    border-radius: 18px;
}

.pillar-card,
.organizer-card {
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.pillar-card:hover,
.organizer-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 18px 38px rgba(37, 49, 59, 0.15);
}

.pillar-card {
    border-top: 4px solid #f2c14e;
    background:
        linear-gradient(180deg, rgba(242, 193, 78, 0.07), rgba(255, 255, 255, 0) 38%),
        #ffffff;
}

/* Make the most important selling section stand out */
#why-attend {
    background:
        radial-gradient(circle at 18% 20%, rgba(242, 193, 78, 0.16), transparent 30%),
        radial-gradient(circle at 86% 50%, rgba(15, 143, 127, 0.20), transparent 34%),
        linear-gradient(135deg, #172126 0%, #25313b 62%, #0b4f4a 100%);
}

#why-attend .section-heading {
    color: #ffffff;
}

#why-attend .pillar-card {
    background: rgba(255, 255, 255, 0.095);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-top: 4px solid #f2c14e;
    box-shadow: 0 16px 34px rgba(0, 0, 0, 0.18);
}

#why-attend .pillar-card h3 {
    color: #ffffff;
}

#why-attend .pillar-card p {
    color: #dce6e3;
}

#why-attend .pillar-card:hover {
    background: rgba(255, 255, 255, 0.14);
    box-shadow: 0 20px 42px rgba(0, 0, 0, 0.24);
}

/* Program table: more polished and readable */
.program-table {
    overflow: hidden;
    border-collapse: separate;
    border-spacing: 0;
}

.program-table .info th {
    background: linear-gradient(90deg, #d9efea, #eef7f3);
}

.program-table tbody tr {
    transition: background-color 0.16s ease;
}

.program-table tbody tr:hover td {
    background-color: #f6fbf9;
}

.program-table tbody tr.active:hover td {
    background-color: #f1f3f4;
}

/* Small mobile protection */
@media (max-width: 767px) {
    .hero-links a:hover,
    .hero-links a:focus,
    .pillar-card:hover,
    .organizer-card:hover {
        transform: none;
    }

    #why-attend {
        background: linear-gradient(135deg, #172126 0%, #25313b 100%);
    }
}


/* ===== Visible fancy layer: hero agent constellation + card icons ===== */

.card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    margin-right: 10px;
    border-radius: 50%;
    background: rgba(15, 143, 127, 0.10);
    color: #0f8f7f;
    font-size: 16px;
    vertical-align: middle;
}

#why-attend .card-icon {
    background: rgba(242, 193, 78, 0.16);
    color: #f2c14e;
}

.hero-tech-visual {
    display: none;
}

/* Only show the floating visual on wide screens.
   This avoids breaking the hero layout on laptops/tablets/phones. */
@media (min-width: 1200px) {
    .hero-content {
        position: relative;
        min-height: 340px;
        padding-right: 390px;
    }

    .hero-tech-visual {
        display: block;
        position: absolute;
        right: 12px;
        top: 50%;
        width: 340px;
        height: 340px;
        transform: translateY(-50%);
        pointer-events: none;
        animation: techFloat 6s ease-in-out infinite;
    }

    .tech-ring {
        position: absolute;
        border-radius: 50%;
        border: 1px dashed rgba(255, 255, 255, 0.26);
        box-shadow: 0 0 38px rgba(15, 143, 127, 0.20);
    }

    .tech-ring-one {
        inset: 0;
        animation: techSpin 28s linear infinite;
    }

    .tech-ring-two {
        inset: 60px;
        border-style: solid;
        border-color: rgba(242, 193, 78, 0.30);
        animation: techSpinReverse 22s linear infinite;
    }

    .tech-core {
        position: absolute;
        left: 50%;
        top: 50%;
        width: 108px;
        height: 108px;
        transform: translate(-50%, -50%);
        border-radius: 50%;
        background:
            radial-gradient(circle at 35% 25%, rgba(255, 255, 255, 0.24), transparent 34%),
            linear-gradient(135deg, rgba(15, 143, 127, 0.94), rgba(23, 33, 38, 0.96));
        border: 1px solid rgba(255, 255, 255, 0.28);
        color: #ffffff;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        box-shadow:
            0 0 0 8px rgba(255, 255, 255, 0.05),
            0 18px 42px rgba(0, 0, 0, 0.34),
            0 0 42px rgba(15, 143, 127, 0.40);
    }

    .tech-core .fa {
        font-size: 34px;
        margin-bottom: 7px;
        color: #f2c14e;
    }

    .tech-core span {
        font-size: 13px;
        font-weight: 800;
        letter-spacing: 0.4px;
        text-transform: uppercase;
    }

    .tech-node {
        position: absolute;
        display: inline-flex;
        align-items: center;
        gap: 7px;
        min-width: 94px;
        height: 36px;
        padding: 0 12px;
        border-radius: 999px;
        background: rgba(23, 33, 38, 0.80);
        border: 1px solid rgba(242, 193, 78, 0.52);
        color: #ffffff;
        font-size: 13px;
        font-weight: 800;
        box-shadow:
            0 10px 26px rgba(0, 0, 0, 0.28),
            0 0 22px rgba(242, 193, 78, 0.14);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
    }

    .tech-node .fa {
        color: #f2c14e;
        font-size: 14px;
    }

    .node-data {
        left: 50%;
        top: -8px;
        transform: translateX(-50%);
    }

    .node-tools {
        right: -22px;
        top: 82px;
    }

    .node-memory {
        right: 8px;
        bottom: 56px;
    }

    .node-agents {
        left: 8px;
        bottom: 56px;
    }

    .node-trust {
        left: -22px;
        top: 82px;
    }

    .node-eval {
        left: 50%;
        bottom: -8px;
        transform: translateX(-50%);
    }
}

@keyframes techFloat {
    0% {
        transform: translateY(-50%) translate3d(0, 0, 0);
    }
    50% {
        transform: translateY(-50%) translate3d(0, -12px, 0);
    }
    100% {
        transform: translateY(-50%) translate3d(0, 0, 0);
    }
}

@keyframes techSpin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes techSpinReverse {
    from {
        transform: rotate(360deg);
    }
    to {
        transform: rotate(0deg);
    }
}

.program-table tbody td {
    color: #25313b !important;
}

.program-table tbody tr:hover td {
    color: #25313b !important;
    background-color: #f6fbf9 !important;
}

.program-table tbody tr.active td {
    color: #25313b !important;
    background-color: #f1f3f4 !important;
}