* {
    box-sizing: border-box;
}

:root {
    --text: #0f172a;
    --muted: #64748b;
    --page-bg: #f3f6fb;
    --border: #dbe3ee;

    --organizer-main: #dc2626;
    --organizer-dark: #991b1b;
    --organizer-soft: #fee2e2;
    --organizer-soft-2: #fff1f2;
    --organizer-border: #fca5a5;

    --exhibitor-main: #2563eb;
    --exhibitor-dark: #1d4ed8;
    --exhibitor-soft: #dbeafe;
    --exhibitor-soft-2: #eff6ff;
    --exhibitor-border: #93c5fd;
}

body {
    margin: 0;
    background: var(--page-bg);
    color: var(--text);
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
}

.public-header {
    padding: 22px 20px;
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    text-align: center;
}

.public-logo {
    display: inline-block;
    width: 100%;
    max-width: 620px;
    height: auto;
}

.public-main {
    min-height: calc(100vh - 180px);
}

.public-seminar-container {
    width: 100%;
    max-width: 1320px;
    margin: 0 auto;
    padding: 40px 28px 60px;
}

.public-seminar-page-head {
    position: relative;
    margin-bottom: 30px;
    padding: 48px 40px 46px;
    background:
        radial-gradient(
            circle at top center,
            rgba(220, 38, 38, .08),
            transparent 46%
        ),
        radial-gradient(
            circle at bottom center,
            rgba(37, 99, 235, .07),
            transparent 52%
        ),
        linear-gradient(180deg, #ffffff, #fafafa);
    border: 1px solid #e5e7eb;
    border-radius: 28px;
    box-shadow:
        0 22px 55px rgba(15, 23, 42, .09),
        0 8px 20px rgba(15, 23, 42, .04);
    text-align: center;
    overflow: hidden;
}

.public-seminar-page-head::after {
    content: "";
    position: absolute;
    right: -55px;
    bottom: -55px;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: rgba(37, 99, 235, .06);
    pointer-events: none;
}

.public-seminar-page-label {
    position: relative;
    z-index: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 30px;
    padding: 0 15px;
    margin-bottom: 16px;
    border: 1px solid #cbd5e1;
    border-radius: 999px;
    background: rgba(248, 250, 252, .95);
    color: #334155;
    font-size: 11px;
    font-weight: 900;
    letter-spacing: .16em;
}

.public-seminar-page-head h1 {
    position: relative;
    z-index: 1;
    margin: 0;
    color: #0f172a;
    font-size: clamp(30px, 4vw, 44px);
    font-weight: 900;
    line-height: 1.3;
    letter-spacing: .04em;
}

.public-seminar-page-head p {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin: 18px auto 0;
    color: #64748b;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.9;
}

.public-seminar-date-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    padding: 8px;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 18px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, .06);
}

.public-seminar-date-tab {
    flex: 1;
    min-height: 58px;
    padding: 10px 18px;
    border: 0;
    border-radius: 13px;
    background: #f1f5f9;
    color: #475569;
    font-size: 15px;
    font-weight: 900;
    cursor: pointer;
    transition:
        background .2s ease,
        color .2s ease,
        transform .2s ease,
        box-shadow .2s ease;
}

.public-seminar-date-tab:hover {
    background: #e2e8f0;
    color: #0f172a;
}

.public-seminar-date-tab.active {
    background: linear-gradient(135deg, #334155, #0f172a);
    color: #ffffff;
    box-shadow: 0 10px 22px rgba(15, 23, 42, .22);
}

.public-seminar-tab-date {
    font-size: 18px;
}

.public-seminar-panel {
    display: none;
}

.public-seminar-panel.active {
    display: block;
}

.public-seminar-date-title {
    margin: 0 0 24px;
    color: #0f172a;
    text-align: center;
    font-size: 28px;
    font-weight: 900;
}

.public-seminar-columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 22px;
}

.public-seminar-column {
    min-width: 0;
    overflow: hidden;
    border-radius: 22px;
    box-shadow: 0 18px 40px rgba(15, 23, 42, .07);
}

/* 主催者セミナー：赤系 */
.public-seminar-column-organizer {
    background: var(--organizer-soft-2);
    border: 2px solid var(--organizer-border);
}

/* 出展者セミナー：青系 */
.public-seminar-column-exhibitor {
    background: var(--exhibitor-soft-2);
    border: 2px solid var(--exhibitor-border);
}

.public-seminar-column-head {
    padding: 22px 24px;
}

.public-seminar-column-head.organizer {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    border-bottom: 2px solid var(--organizer-main);
}

.public-seminar-column-head.exhibitor {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    border-bottom: 2px solid var(--exhibitor-main);
}

.public-seminar-column-head span {
    display: block;
    margin-bottom: 5px;
    font-size: 10px;
    font-weight: 900;
    letter-spacing: .12em;
}

.public-seminar-column-head.organizer span,
.public-seminar-column-head.organizer h3 {
    color: var(--organizer-dark);
}

.public-seminar-column-head.exhibitor span,
.public-seminar-column-head.exhibitor h3 {
    color: var(--exhibitor-dark);
}

.public-seminar-column-head h3 {
    margin: 0;
    font-size: 21px;
    font-weight: 900;
}

.public-seminar-list {
    display: grid;
    gap: 16px;
    padding: 18px;
}

.public-seminar-column-organizer .public-seminar-list {
    background:
        linear-gradient(
            180deg,
            rgba(255, 241, 242, .88),
            rgba(255, 255, 255, .9)
        );
}

.public-seminar-column-exhibitor .public-seminar-list {
    background:
        linear-gradient(
            180deg,
            rgba(239, 246, 255, .9),
            rgba(255, 255, 255, .92)
        );
}

.public-seminar-card {
    overflow: hidden;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 17px;
    box-shadow: 0 8px 20px rgba(15, 23, 42, .04);
    transition:
        transform .2s ease,
        box-shadow .2s ease;
}

.public-seminar-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(15, 23, 42, .08);
}

.public-seminar-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    background: #f8fafc;
    border-bottom: 1px solid #e2e8f0;
}

.public-seminar-column-organizer .public-seminar-card-top {
    background: #fff7f7;
    border-bottom-color: #fecaca;
}

.public-seminar-column-exhibitor .public-seminar-card-top {
    background: #f5f9ff;
    border-bottom-color: #bfdbfe;
}

.public-seminar-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 54px;
    min-height: 32px;
    padding: 0 11px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 900;
}

.public-seminar-column-organizer .public-seminar-number {
    background: var(--organizer-soft);
    border: 1px solid var(--organizer-border);
    color: var(--organizer-dark);
}

.public-seminar-column-exhibitor .public-seminar-number {
    background: var(--exhibitor-soft);
    border: 1px solid var(--exhibitor-border);
    color: var(--exhibitor-dark);
}

.public-seminar-time {
    font-size: 15px;
    font-weight: 900;
    white-space: nowrap;
}

.public-seminar-column-organizer .public-seminar-time {
    color: #b91c1c;
}

.public-seminar-column-exhibitor .public-seminar-time {
    color: var(--exhibitor-dark);
}

.public-seminar-time span {
    margin: 0 4px;
    color: #94a3b8;
}

.public-seminar-card-body {
    padding: 18px 17px;
}

.public-seminar-card-body h4 {
    margin: 0;
    color: #0f172a;
    font-size: 17px;
    font-weight: 900;
    line-height: 1.65;
}

.public-seminar-speakers {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.public-seminar-speaker {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 11px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
}

.public-seminar-column-organizer .public-seminar-speaker {
    background: #fffafa;
    border-color: #fecaca;
}

.public-seminar-column-exhibitor .public-seminar-speaker {
    background: #f8fbff;
    border-color: #bfdbfe;
}

.public-seminar-speaker-photo {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    overflow: hidden;
    border-radius: 50%;
    background: #e2e8f0;
}

.public-seminar-speaker-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.public-seminar-speaker-name {
    color: #0f172a;
    font-size: 14px;
    font-weight: 900;
    line-height: 1.5;
}

.public-seminar-speaker-position {
    margin-top: 3px;
    color: #64748b;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.6;
}

.public-seminar-undecided {
    margin-top: 13px;
    color: #94a3b8;
    font-size: 13px;
    font-weight: 700;
}

.public-seminar-details {
    margin-top: 16px;
    overflow: hidden;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.public-seminar-column-organizer .public-seminar-details {
    background: #fffafa;
    border-color: #fecaca;
}

.public-seminar-column-exhibitor .public-seminar-details {
    background: #f8fbff;
    border-color: #bfdbfe;
}

.public-seminar-details summary {
    position: relative;
    padding: 13px 42px 13px 15px;
    font-size: 13px;
    font-weight: 900;
    cursor: pointer;
    list-style: none;
}

.public-seminar-column-organizer .public-seminar-details summary {
    color: #b91c1c;
}

.public-seminar-column-exhibitor .public-seminar-details summary {
    color: var(--exhibitor-dark);
}

.public-seminar-details summary::-webkit-details-marker {
    display: none;
}

.public-seminar-details summary::after {
    content: "＋";
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    font-size: 20px;
    font-weight: 900;
}

.public-seminar-column-organizer .public-seminar-details summary::after {
    color: var(--organizer-main);
}

.public-seminar-column-exhibitor .public-seminar-details summary::after {
    color: var(--exhibitor-main);
}

.public-seminar-details[open] summary::after {
    content: "−";
}

.public-seminar-description {
    padding: 15px;
    background: #ffffff;
    border-top: 1px solid var(--border);
    color: #475569;
    font-size: 13px;
    font-weight: 600;
    line-height: 1.9;
}

.public-seminar-column-organizer .public-seminar-description {
    border-top-color: #fecaca;
}

.public-seminar-column-exhibitor .public-seminar-description {
    border-top-color: #bfdbfe;
}

.public-seminar-column-empty,
.public-seminar-empty {
    padding: 40px 24px;
    color: #64748b;
    text-align: center;
    font-size: 14px;
    font-weight: 800;
}

.public-footer {
    padding: 30px 20px 36px;
    color: #64748b;
    text-align: center;
}

@media (max-width: 900px) {
    .public-seminar-columns {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .public-seminar-container {
        padding: 24px 16px 40px;
    }

    .public-seminar-page-head {
        padding: 38px 22px 36px;
        border-radius: 22px;
    }

    .public-seminar-page-head h1 {
        font-size: 28px;
    }

    .public-seminar-page-head p {
        font-size: 13px;
    }

    .public-seminar-date-tabs {
        overflow-x: auto;
    }

    .public-seminar-date-tab {
        flex: 0 0 auto;
        min-width: 150px;
    }

    .public-seminar-date-title {
        font-size: 23px;
    }

    .public-seminar-column-head {
        padding: 19px 18px;
    }

    .public-seminar-list {
        padding: 13px;
    }

    .public-seminar-card-top {
        align-items: flex-start;
        flex-direction: column;
    }

    .public-seminar-time {
        align-self: flex-end;
    }
}

/* =========================
   Floating Action Buttons
========================= */

.public-fixed-action {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    z-index: 9999;

    display: flex;
    gap: 20px;

    padding: 16px 18px;

    background: rgba(255,255,255,.96);
    backdrop-filter: blur(14px);

    border-radius: 26px;
    box-shadow: 0 20px 50px rgba(15,23,42,.28);
}


.public-fixed-btn {
    display: flex;
    align-items: center;
    justify-content: center;

    min-width: 300px;
    height: 72px;

    border-radius: 20px;

    color: #fff;
    text-decoration: none;

    font-size: 21px;
    font-weight: 900;
    letter-spacing: .03em;

    transition: .2s;
}

.public-fixed-btn:hover {
    transform: translateY(-4px) scale(1.03);
}

.public-fixed-btn-register {
    background: linear-gradient(135deg,#f59e0b,#ea580c);
    box-shadow: 0 16px 32px rgba(234,88,12,.35);
}

.public-fixed-btn-register:hover {
    box-shadow: 0 10px 24px rgba(220,38,38,.35);
}

.public-fixed-btn-seminar {
    background: linear-gradient(135deg,#8b5cf6,#6d28d9);
    box-shadow: 0 16px 32px rgba(109,40,217,.35);
}

.public-fixed-btn-seminar:hover {
    box-shadow: 0 10px 24px rgba(37,99,235,.35);
}

/* ボタンに隠れないように */
.public-seminar-container {
    padding-bottom: 120px;
}

@media (max-width: 768px) {

    .public-fixed-action {
        left: 12px;
        right: 12px;
        bottom: 12px;
        transform: none;

        flex-direction: column;
        gap: 10px;

        border-radius: 20px;
    }

    .public-fixed-btn {
        width: 100%;
        min-width: 0;
        height: 52px;
        font-size: 15px;
    }

    .public-seminar-container {
        padding-bottom: 160px;
    }
}