/* ===== CSS Variables & Reset ===== */
:root {
    --bni-red: #CC0000;
    --bni-red-light: #E63333;
    --bni-red-dark: #990000;
    --bni-gold: #D4A843;
    --bni-gold-light: #E8C96D;
    --bni-dark: #0A0A0F;
    --bni-darker: #050508;
    --bni-gray-900: #111118;
    --bni-gray-800: #1A1A24;
    --bni-gray-700: #252530;
    --bni-gray-600: #35354A;
    --bni-gray-400: #8888AA;
    --bni-gray-300: #AAAACC;
    --bni-gray-200: #CCCCDD;
    --bni-white: #F0F0F8;
    --bni-accent-blue: #4A90D9;
    --bni-accent-green: #2ECC71;
    --bni-accent-purple: #9B59B6;

    --font-main: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 1px 4px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 40px rgba(204, 0, 0, 0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-main);
    background: var(--bni-dark);
    color: var(--bni-white);
    overflow-x: hidden;
    line-height: 1.6;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Particles Background ===== */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--bni-red);
    border-radius: 50%;
    opacity: 0;
    animation: floatParticle linear infinite;
}

@keyframes floatParticle {
    0% {
        opacity: 0;
        transform: translateY(100vh) scale(0);
    }
    10% {
        opacity: 0.6;
    }
    90% {
        opacity: 0.3;
    }
    100% {
        opacity: 0;
        transform: translateY(-10vh) scale(1);
    }
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(204, 0, 0, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(212, 168, 67, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(74, 144, 217, 0.06) 0%, transparent 50%),
        var(--bni-darker);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(135deg, rgba(10, 10, 15, 0.9) 0%, rgba(10, 10, 15, 0.5) 50%, rgba(10, 10, 15, 0.9) 100%);
    z-index: 1;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        conic-gradient(from 0deg at 50% 50%, transparent 0deg, rgba(204, 0, 0, 0.03) 60deg, transparent 120deg, rgba(212, 168, 67, 0.03) 180deg, transparent 240deg, rgba(74, 144, 217, 0.03) 300deg, transparent 360deg);
    animation: rotateBg 30s linear infinite;
    z-index: 0;
}

@keyframes rotateBg {
    100% { transform: rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 24px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bni-logo-area {
    margin-bottom: 32px;
}

.bni-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 28px;
    background: rgba(204, 0, 0, 0.1);
    border: 1px solid rgba(204, 0, 0, 0.3);
    border-radius: 50px;
    backdrop-filter: blur(10px);
}

.bni-text {
    font-size: 28px;
    font-weight: 900;
    color: var(--bni-red);
    letter-spacing: 2px;
}

.accelerate-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--bni-gray-300);
    letter-spacing: 4px;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.4rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
}

.title-line {
    display: block;
    background: linear-gradient(135deg, var(--bni-white) 0%, var(--bni-gold) 50%, var(--bni-white) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 200% center; }
}

.title-divider {
    display: block;
    color: var(--bni-red);
    font-size: 2rem;
    margin: 8px 0;
}

.title-sub {
    display: block;
    color: var(--bni-red-light);
    font-size: clamp(1.6rem, 4vw, 2.8rem);
    font-weight: 700;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--bni-gray-400);
    margin-bottom: 48px;
    letter-spacing: 2px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 48px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 900;
    color: var(--bni-gold);
    line-height: 1;
}

.stat-number::after {
    content: '+';
    font-size: 1.6rem;
    color: var(--bni-gold-light);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--bni-gray-400);
    margin-top: 8px;
    letter-spacing: 2px;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 36px;
    background: linear-gradient(135deg, var(--bni-red) 0%, var(--bni-red-dark) 100%);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 1px;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(204, 0, 0, 0.4);
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(204, 0, 0, 0.5);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.mouse {
    width: 26px;
    height: 42px;
    border: 2px solid var(--bni-gray-600);
    border-radius: 13px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--bni-red-light);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* ===== Navigation ===== */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 12px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transform: translateY(-100%);
    transition: transform 0.4s ease;
}

.nav-bar.visible {
    transform: translateY(0);
}

.nav-inner {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--bni-white);
}

.nav-bni {
    color: var(--bni-red);
    font-weight: 900;
    margin-right: 6px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    color: var(--bni-gray-300);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--bni-white);
    background: rgba(255, 255, 255, 0.06);
}

.nav-link-cta {
    background: linear-gradient(135deg, var(--bni-red), var(--bni-red-dark));
    color: white !important;
}

.nav-link-cta:hover {
    background: linear-gradient(135deg, var(--bni-red-light), var(--bni-red)) !important;
    box-shadow: 0 4px 16px rgba(204, 0, 0, 0.4);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--bni-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Section Styles ===== */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(204, 0, 0, 0.1);
    border: 1px solid rgba(204, 0, 0, 0.2);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--bni-red-light);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--bni-white), var(--bni-gray-300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--bni-gray-400);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Groups Grid (Masonry Layout) ===== */
.groups-grid {
    columns: 2;
    column-gap: 28px;
}

@media (min-width: 1100px) {
    .groups-grid {
        columns: 3;
    }
}

/* ===== Group Card ===== */
.group-card {
    position: relative;
    background: linear-gradient(145deg, var(--bni-gray-800), var(--bni-gray-900));
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    break-inside: avoid;
    margin-bottom: 28px;
}

.group-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.group-card:hover {
    transform: translateY(-6px);
    border-color: rgba(204, 0, 0, 0.3);
    box-shadow: var(--shadow-card), var(--shadow-glow);
}

.card-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--bni-red), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.group-card:hover .card-glow {
    opacity: 1;
}

/* Card theme colors */
.group-card[data-group="wealth"] { --card-accent: #D4A843; }
.group-card[data-group="realestate"] { --card-accent: #4A90D9; }
.group-card[data-group="empower"] { --card-accent: #E67E22; }
.group-card[data-group="food"] { --card-accent: #E74C3C; }
.group-card[data-group="pr"] { --card-accent: #9B59B6; }
.group-card[data-group="b2b"] { --card-accent: #2ECC71; }
.group-card[data-group="lifestyle"] { --card-accent: #E91E63; }
.group-card[data-group="green"] { --card-accent: #27AE60; }

.card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: rgba(204, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-icon svg {
    width: 22px;
    height: 22px;
    stroke: var(--card-accent, var(--bni-red));
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--bni-white);
    flex: 1;
}

.card-badge {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 50px;
    font-size: 0.7rem;
    color: var(--card-accent, var(--bni-gray-400));
    font-weight: 600;
    letter-spacing: 1px;
    white-space: nowrap;
}

/* ===== Member Rows ===== */
.card-members {
    margin-bottom: 20px;
}

.member-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    transition: var(--transition);
}

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

.member-row:hover {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    padding-left: 8px;
    padding-right: 8px;
    margin-left: -8px;
    margin-right: -8px;
}

.member-num {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--card-accent, var(--bni-gray-400));
    flex-shrink: 0;
}

.member-name {
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--bni-white);
    white-space: nowrap;
    min-width: 56px;
}

.member-role {
    font-size: 0.82rem;
    color: var(--bni-gray-400);
    flex: 1;
}

/* ===== Seeking Section ===== */
.card-seeking {
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.seeking-label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--bni-gold);
    margin-bottom: 10px;
}

.seeking-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    padding: 4px 12px;
    background: rgba(212, 168, 67, 0.08);
    border: 1px solid rgba(212, 168, 67, 0.15);
    border-radius: 50px;
    font-size: 0.75rem;
    color: var(--bni-gold-light);
    white-space: nowrap;
    transition: var(--transition);
}

.tag:hover {
    background: rgba(212, 168, 67, 0.15);
    border-color: rgba(212, 168, 67, 0.3);
}

/* ===== Unassigned Section ===== */
.unassigned-section {
    background: 
        radial-gradient(ellipse at 30% 50%, rgba(212, 168, 67, 0.05) 0%, transparent 50%),
        var(--bni-darker);
}

.unassigned-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.unassigned-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: linear-gradient(145deg, var(--bni-gray-800), var(--bni-gray-900));
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.unassigned-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.unassigned-card:hover {
    transform: translateY(-3px) scale(1.02);
    border-color: rgba(212, 168, 67, 0.3);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.ua-num {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(212, 168, 67, 0.15), rgba(212, 168, 67, 0.05));
    border: 1px solid rgba(212, 168, 67, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--bni-gold);
    flex-shrink: 0;
}

.ua-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.ua-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--bni-white);
}

.ua-role {
    font-size: 0.85rem;
    color: var(--bni-gray-400);
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 80px 0;
}

.cta-card-main {
    position: relative;
    padding: 60px 48px;
    background: 
        linear-gradient(145deg, rgba(204, 0, 0, 0.08), rgba(10, 10, 15, 0.9)),
        linear-gradient(145deg, var(--bni-gray-800), var(--bni-gray-900));
    border: 1px solid rgba(204, 0, 0, 0.15);
    border-radius: var(--radius-xl);
    text-align: center;
    overflow: hidden;
}

.cta-glow {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(204, 0, 0, 0.1), transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 900;
    color: var(--bni-red-light);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.cta-desc {
    font-size: 1.1rem;
    color: var(--bni-gray-300);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

.cta-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    position: relative;
    z-index: 1;
}

.cta-feature {
    padding: 24px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.cta-feature:hover {
    background: rgba(255, 255, 255, 0.06);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: 14px;
}

.cta-feature h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--bni-white);
    margin-bottom: 8px;
}

.cta-feature p {
    font-size: 0.88rem;
    color: var(--bni-gray-400);
    line-height: 1.5;
}

/* ===== Contact Section ===== */
.contact-section {
    background: var(--bni-darker);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.contact-card {
    padding: 32px 24px;
    background: linear-gradient(145deg, var(--bni-gray-800), var(--bni-gray-900));
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    border-color: rgba(204, 0, 0, 0.2);
}

.contact-icon {
    font-size: 2.4rem;
    margin-bottom: 16px;
}

.contact-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--bni-white);
    margin-bottom: 12px;
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--bni-gray-400);
    line-height: 1.8;
}

/* ===== Footer ===== */
.footer {
    padding: 48px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    background: var(--bni-darker);
}

.footer-content {
    text-align: center;
}

.footer-brand {
    margin-bottom: 12px;
}

.footer-bni {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--bni-red);
    margin-right: 6px;
}

.footer-chapter {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--bni-white);
}

.footer-text {
    font-size: 0.9rem;
    color: var(--bni-gold);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.footer-copyright {
    font-size: 0.8rem;
    color: var(--bni-gray-600);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .groups-grid {
        columns: 1;
    }

    .unassigned-grid {
        grid-template-columns: 1fr;
    }

    .nav-links {
        position: fixed;
        top: 58px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
        pointer-events: none;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-toggle {
        display: flex;
    }

    .cta-card-main {
        padding: 40px 24px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .bni-badge {
        flex-direction: column;
        gap: 4px;
        padding: 10px 20px;
    }

    .section {
        padding: 60px 0;
    }
}

/* ===== Utility Animation Classes ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}