/* ============================================================
   ERCC 2026 落地页样式 — v3 从零重设计
   品牌色: #274B92 / 辅助色: #FAC10C
   规范: 全站直角, 禁止 border-radius
   理念: 少即是多 / 信息分层 / 呼吸感
   ============================================================ */

/* ====== HERO ====== */
.lp-hero {
    position: relative;
    min-height: 92vh;
    padding-top: var(--nav-height, 96px);
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0a1628;
    color: #fff;
    text-align: center;
    overflow: hidden;
}

/* 网格背景 — 科技质感 */
.lp-hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

/* 中心光晕 */
.lp-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 55%, rgba(39, 75, 146, 0.25) 0%, transparent 65%);
    pointer-events: none;
}

.lp-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 720px;
    padding: 0 24px;
}

/* 年份 — 超大装饰 */
.lp-hero-year {
    display: block;
    font-size: clamp(100px, 20vw, 200px);
    font-weight: 900;
    line-height: 0.85;
    letter-spacing: -0.04em;
    color: rgba(250, 193, 12, 0.07);
    position: absolute;
    top: -0.15em;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    white-space: nowrap;
    user-select: none;
}

/* 主标题 */
.lp-hero-title {
    position: relative;
    margin: 0 0 0;
    line-height: 1;
}

.lp-hero-name {
    display: block;
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.lp-hero-en {
    display: block;
    font-size: clamp(48px, 10vw, 96px);
    font-weight: 900;
    letter-spacing: 0.15em;
    color: #FAC10C;
    line-height: 1;
    margin-top: 4px;
}

.lp-hero-edition {
    font-size: clamp(14px, 2vw, 18px);
    color: rgba(255,255,255,0.5);
    margin-top: 20px;
    letter-spacing: 0.1em;
}

/* 地点+日期 */
.lp-hero-loc {
    margin-top: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    font-size: 15px;
    color: rgba(255,255,255,0.65);
}

.lp-hero-loc-city {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.lp-hero-loc-city svg {
    width: 14px;
    height: 14px;
    opacity: 0.6;
}

.lp-hero-loc-date {
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.05em;
}

/* CTA */
.lp-hero-cta {
    margin-top: 48px;
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* ====== BUTTONS ====== */
.lp-btn-gold {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 36px;
    background: #FAC10C;
    color: #0a1628;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
}

.lp-btn-gold:hover {
    background: #fdd84a;
    transform: translateY(-1px);
}

.lp-btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 36px;
    border: 1.5px solid rgba(255,255,255,0.3);
    background: transparent;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

.lp-btn-ghost:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.06);
}

/* 浅色区域下的 ghost 按钮 */
.lp-section:not(.lp-section-dark):not(.lp-cta) .lp-btn-ghost {
    border-color: #274B92;
    color: #274B92;
}

.lp-section:not(.lp-section-dark):not(.lp-cta) .lp-btn-ghost:hover {
    background: #274B92;
    color: #fff;
}

/* ====== SECTIONS 通用 ====== */
.lp-section {
    padding: 80px 0;
    background: #f5f7fb;
}

.lp-section-white {
    background: #fff;
}

.lp-section-dark {
    background: #0f1d35;
    color: #fff;
}

.lp-section-header {
    text-align: center;
    margin-bottom: 52px;
}

.lp-section-title {
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 700;
    color: #16233c;
    margin: 0;
    position: relative;
    display: inline-block;
}

.lp-section-dark .lp-section-title {
    color: #fff;
}

/* 标题装饰线 */
.lp-section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: #FAC10C;
    margin: 14px auto 0;
}

.lp-section-subtitle {
    color: #7a869a;
    font-size: 15px;
    margin-top: 10px;
    line-height: 1.7;
}

.lp-section-dark .lp-section-subtitle {
    color: rgba(255,255,255,0.5);
}

/* ====== KEY NUMBERS ====== */
.lp-kv-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    max-width: 720px;
    margin: 0 auto;
}

.lp-kv {
    flex: 1;
    text-align: center;
}

.lp-kv-num {
    display: block;
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 900;
    color: #FAC10C;
    line-height: 1;
    letter-spacing: -0.02em;
}

.lp-kv-suffix {
    font-size: 0.45em;
    font-weight: 700;
    letter-spacing: 0;
}

.lp-kv-label {
    display: block;
    font-size: 13px;
    color: rgba(255,255,255,0.45);
    margin-top: 8px;
    letter-spacing: 0.05em;
}

.lp-kv-divider {
    width: 1px;
    height: 48px;
    background: rgba(255,255,255,0.12);
    flex-shrink: 0;
}

/* ====== ABOUT CARDS ====== */
.lp-card-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.lp-card {
    background: #fff;
    border: 1px solid #e2eaf4;
    padding: 28px 24px;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.lp-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(39, 75, 146, 0.08);
    border-color: #274B92;
}

.lp-card-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}

.lp-card-icon svg {
    width: 26px;
    height: 26px;
}

.lp-card-icon--blue svg { color: #274B92; }
.lp-card-icon--gold svg { color: #b47e00; }
.lp-card-icon--green svg { color: #10b981; }
.lp-card-icon--purple svg { color: #6366f1; }

.lp-card-title {
    font-size: 16px;
    font-weight: 700;
    color: #16233c;
    margin-bottom: 8px;
}

.lp-card-desc {
    font-size: 13px;
    color: #6b7a90;
    line-height: 1.75;
}

/* ====== HIGHLIGHT CARDS ====== */
.lp-hl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.lp-hl-card {
    position: relative;
    background: #fff;
    border: 1px solid #e2eaf4;
    border-top: 3px solid var(--hl-accent, #274B92);
    padding: 32px 28px;
    overflow: hidden;
}

.lp-hl-num {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 56px;
    font-weight: 900;
    color: var(--hl-accent, #274B92);
    opacity: 0.06;
    line-height: 1;
    pointer-events: none;
}

.lp-hl-title {
    font-size: 19px;
    font-weight: 700;
    color: #16233c;
    margin-bottom: 16px;
}

.lp-hl-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lp-hl-list li {
    padding: 7px 0;
    font-size: 14px;
    color: #4a5568;
    line-height: 1.65;
    padding-left: 18px;
    position: relative;
}

.lp-hl-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--hl-accent, #274B92);
}

.lp-hl-list li + li {
    border-top: 1px solid #f0f3f9;
}

/* ====== EVENT TABLE ====== */
.lp-table-wrap {
    overflow-x: auto;
}

.lp-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: #fff;
    border: 1px solid #e2eaf4;
}

.lp-table thead {
    background: #0f1d35;
    color: #fff;
}

.lp-table th {
    padding: 14px 20px;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.lp-table td {
    padding: 12px 20px;
    font-size: 14px;
    border-bottom: 1px solid #f0f3f9;
    color: #333;
}

.lp-table tr:last-child td {
    border-bottom: none;
}

.lp-table tbody tr:hover {
    background: #f8faff;
}

.lp-table-cat {
    font-weight: 600;
    color: #274B92;
    white-space: nowrap;
}

.lp-tag {
    display: inline-block;
    padding: 2px 10px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.lp-tag-new {
    background: #fef3c7;
    color: #92400e;
}

.lp-tag-hot {
    background: #fee2e2;
    color: #991b1b;
}

/* ====== WHY JOIN ====== */
.lp-why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.lp-why-card {
    background: #f5f7fb;
    border: 1px solid #e2eaf4;
    padding: 32px 28px;
}

.lp-why-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
}

.lp-why-head svg {
    width: 32px;
    height: 32px;
    color: #274B92;
    flex-shrink: 0;
}

.lp-why-title {
    font-size: 18px;
    font-weight: 700;
    color: #16233c;
}

.lp-why-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lp-why-list li {
    padding: 8px 0;
    font-size: 14px;
    color: #4a5568;
    line-height: 1.6;
    padding-left: 20px;
    position: relative;
}

.lp-why-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
    width: 5px;
    height: 5px;
    background: #274B92;
}

.lp-why-list li + li {
    border-top: 1px solid #edf1f7;
}

/* ====== TIMELINE ====== */
.lp-timeline {
    position: relative;
    max-width: 680px;
    margin: 0 auto;
    padding-left: 36px;
}

.lp-timeline::before {
    content: '';
    position: absolute;
    left: 9px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #c4d3e8;
}

.lp-tl-item {
    position: relative;
    margin-bottom: 28px;
    padding-left: 20px;
}

.lp-tl-item:last-child {
    margin-bottom: 0;
}

.lp-tl-dot {
    position: absolute;
    left: -31px;
    top: 5px;
    width: 10px;
    height: 10px;
    background: #274B92;
    border: 2px solid #f5f7fb;
}

.lp-tl-dot--key {
    background: #FAC10C;
    width: 12px;
    height: 12px;
    left: -32px;
    top: 4px;
    box-shadow: 0 0 0 4px rgba(250, 193, 12, 0.15);
}

.lp-tl-item--key .lp-tl-body {
    background: #fff;
    border: 1px solid #e2eaf4;
    padding: 14px 18px;
    margin: -6px -14px 0;
}

.lp-tl-date {
    font-size: 12px;
    font-weight: 700;
    color: #274B92;
    letter-spacing: 0.03em;
    margin-bottom: 3px;
    display: block;
}

.lp-tl-item--key .lp-tl-date {
    color: #b47e00;
}

.lp-tl-title {
    font-weight: 600;
    font-size: 15px;
    color: #16233c;
    margin-bottom: 2px;
}

.lp-tl-desc {
    font-size: 13px;
    color: #7a869a;
    line-height: 1.65;
}

/* ====== GUEST CARDS (无头像，4列网格) ====== */
.lp-guest-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.lp-guest-card {
    background: #f5f7fb;
    border: 1px solid #e2eaf4;
    border-top: 3px solid var(--g-accent, #274B92);
    padding: 24px 20px;
    transition: box-shadow 0.2s;
}

.lp-guest-card:hover {
    box-shadow: 0 6px 20px rgba(39, 75, 146, 0.08);
}

.lp-guest-badge {
    display: inline-block;
    background: #FAC10C;
    color: #6b4e00;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 10px;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.lp-guest-badge--blue {
    background: #274B92;
    color: #fff;
}

.lp-guest-name {
    font-size: 20px;
    font-weight: 800;
    color: #16233c;
    margin-bottom: 10px;
}

.lp-guest-desc {
    font-size: 13px;
    color: #7a869a;
    line-height: 1.8;
}

/* ====== FAQ ====== */
.lp-faq {
    max-width: 760px;
    margin: 0 auto;
}

.lp-faq-item {
    background: #fff;
    border: 1px solid #e2eaf4;
    margin-bottom: 10px;
    transition: border-color 0.2s;
}

.lp-faq-item:hover {
    border-color: #c4d3e8;
}

.lp-faq-item.open {
    border-color: #274B92;
}

.lp-faq-q {
    padding: 18px 22px;
    font-weight: 600;
    font-size: 15px;
    color: #16233c;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    user-select: none;
    transition: background 0.15s;
}

.lp-faq-q:hover {
    background: #f8faff;
}

.lp-faq-arrow {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    transition: transform 0.25s;
    color: #aab4c4;
}

.lp-faq-item.open .lp-faq-arrow {
    transform: rotate(180deg);
    color: #274B92;
}

.lp-faq-a {
    padding: 0 22px 18px;
    font-size: 14px;
    color: #6b7a90;
    line-height: 1.85;
    display: none;
}

.lp-faq-item.open .lp-faq-a {
    display: block;
}

/* ====== ORGANIZERS ====== */
.lp-org {
    max-width: 760px;
    margin: 0 auto;
}

.lp-org-row {
    display: flex;
    gap: 20px;
    padding: 14px 0;
    border-bottom: 1px solid #edf1f7;
    font-size: 14px;
    line-height: 1.8;
}

.lp-org-row:last-child {
    border-bottom: none;
}

.lp-org-label {
    flex-shrink: 0;
    width: 72px;
    font-weight: 700;
    color: #274B92;
    font-size: 13px;
}

.lp-org-value {
    color: #333;
}

.lp-org-row--muted {
    border-bottom: none;
    margin-top: 4px;
}

.lp-org-row--muted .lp-org-value {
    color: #999;
}

/* ====== CTA ====== */
.lp-cta {
    position: relative;
    background: #0a1628;
    color: #fff;
    text-align: center;
    padding: 100px 0;
    overflow: hidden;
}

.lp-cta-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 60%, rgba(39, 75, 146, 0.3) 0%, transparent 60%);
    pointer-events: none;
}

.lp-cta .container {
    position: relative;
}

.lp-cta-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    line-height: 1.35;
    margin-bottom: 16px;
}

.lp-cta-title span {
    color: #FAC10C;
}

.lp-cta-sub {
    font-size: 15px;
    color: rgba(255,255,255,0.5);
    margin-bottom: 12px;
}

.lp-cta-url {
    margin-bottom: 36px;
}

.lp-cta-url a {
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 800;
    color: #FAC10C;
    text-decoration: none;
    letter-spacing: 0.5px;
    transition: color 0.2s;
}

.lp-cta-url a:hover {
    color: #fff;
}

.lp-cta-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* ====== RESPONSIVE ====== */
@media (max-width: 1024px) {
    .lp-card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .lp-hl-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .lp-why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .lp-guest-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .lp-hero {
        min-height: 80vh;
    }

    .lp-hero-name {
        font-size: clamp(26px, 7vw, 40px);
    }

    .lp-hero-en {
        font-size: clamp(40px, 12vw, 72px);
    }

    .lp-hero-loc {
        flex-direction: column;
        gap: 8px;
        font-size: 14px;
    }

    .lp-hero-year {
        font-size: clamp(80px, 30vw, 140px);
    }

    .lp-section {
        padding: 56px 0;
    }

    .lp-card-grid-4 {
        grid-template-columns: 1fr;
    }

    .lp-hl-grid {
        grid-template-columns: 1fr;
    }

    .lp-why-grid {
        grid-template-columns: 1fr;
    }

    .lp-guest-grid {
        grid-template-columns: 1fr;
    }

    .lp-kv-grid {
        flex-wrap: wrap;
        gap: 24px;
    }

    .lp-kv {
        flex: 0 0 calc(50% - 12px);
    }

    .lp-kv-divider {
        display: none;
    }

    .lp-org-row {
        flex-direction: column;
        gap: 4px;
    }

    .lp-org-label {
        width: auto;
    }

    .lp-table th,
    .lp-table td {
        padding: 10px 14px;
        font-size: 13px;
    }

    .lp-cta {
        padding: 72px 0;
    }

    .lp-timeline {
        padding-left: 28px;
    }

    .lp-tl-dot {
        left: -23px;
    }

    .lp-tl-dot--key {
        left: -24px;
    }

    .lp-tl-item--key .lp-tl-body {
        margin: -6px -8px 0;
        padding: 12px 14px;
    }

    .lp-hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .lp-btn-gold, .lp-btn-ghost {
        width: 200px;
    }
}