:root {
    --bg: #f4f7fb;
    --bg-alt: #eef2fa;
    --ink: #101828;
    --ink-soft: #475467;
    --ink-faint: #98a2b3;
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --accent: #14b8a6;
    --card: rgba(255, 255, 255, 0.6);
    --card-solid: #ffffff;
    --border: rgba(16, 24, 40, 0.08);
    --shadow: 0 20px 60px rgba(79, 70, 229, 0.12);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --bd: 1px solid var(--border);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background:
        radial-gradient(circle at 15% 10%, rgba(79, 70, 229, 0.10), transparent 40%),
        radial-gradient(circle at 85% 20%, rgba(20, 184, 166, 0.10), transparent 40%),
        var(--bg);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Navbar ---------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(16px);
    background: rgba(244, 247, 251, 0.75);
    border-bottom: var(--bd);
}
.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    max-width: 1160px;
    margin: 0 auto;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
}
.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
}
.nav-links {
    display: flex;
    gap: 28px;
    font-size: 14px;
    color: var(--ink-soft);
    font-weight: 500;
}
.nav-links a:hover { color: var(--primary); }
.nav-cta {
    background: var(--primary);
    color: #fff !important;
    padding: 10px 20px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 14px;
    transition: transform .2s ease, box-shadow .2s ease;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(79,70,229,.3); }

/* ---------- Hero ---------- */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--card);
    border: var(--bd);
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-dark);
    backdrop-filter: blur(10px);
    margin-bottom: 28px;
}
.hero h1 {
    font-size: clamp(32px, 5.5vw, 58px);
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 20px;
    letter-spacing: -0.02em;
    background: linear-gradient(120deg, var(--ink) 30%, var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero p.subtitle {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--ink-soft);
    max-width: 560px;
    margin: 0 auto 36px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.btn {
    padding: 15px 30px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: transform .2s ease, box-shadow .2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: 0 12px 30px rgba(79, 70, 229, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(79, 70, 229, 0.4); }
.btn-ghost {
    background: var(--card);
    color: var(--ink);
    border: var(--bd);
    backdrop-filter: blur(10px);
}
.btn-ghost:hover { transform: translateY(-2px); }

.hero-visual {
    margin-top: 64px;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}
.stat-pill {
    background: var(--card);
    border: var(--bd);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 18px 26px;
    min-width: 140px;
    box-shadow: var(--shadow);
}
.stat-pill .num { font-size: 24px; font-weight: 800; color: var(--primary-dark); }
.stat-pill .label { font-size: 12px; color: var(--ink-faint); margin-top: 4px; }

/* ---------- Section shared ---------- */
.section { padding: 80px 0; }
.section-head { text-align: center; max-width: 620px; margin: 0 auto 52px; }
.section-eyebrow {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 10px;
}
.section-head h2 {
    font-size: clamp(26px, 3.5vw, 36px);
    font-weight: 800;
    margin: 0 0 12px;
    letter-spacing: -0.01em;
}
.section-head p { color: var(--ink-soft); font-size: 16px; }

/* ---------- Features ---------- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.feature-card {
    background: var(--card);
    border: var(--bd);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    padding: 30px 26px;
    transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(79,70,229,.12), rgba(20,184,166,.12));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}
.feature-card h3 { margin: 0 0 8px; font-size: 17px; font-weight: 700; }
.feature-card p { margin: 0; font-size: 14px; color: var(--ink-soft); line-height: 1.6; }

/* ---------- How it works ---------- */
.flow-wrap {
    background: var(--card);
    border: var(--bd);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    box-shadow: var(--shadow);
}
.flow-grid {
    display: flex;
    align-items: stretch;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}
.flow-step {
    flex: 1;
    min-width: 150px;
    text-align: center;
    padding: 16px;
}
.flow-step .step-num {
    width: 36px;
    height: 36px;
    margin: 0 auto 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}
.flow-step h4 { margin: 0 0 6px; font-size: 15px; font-weight: 700; }
.flow-step p { margin: 0; font-size: 13px; color: var(--ink-soft); }
.flow-branch {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-top: 8px;
    flex-wrap: wrap;
}
.flow-arrow { align-self: center; color: var(--ink-faint); font-size: 20px; }

/* ---------- Sponsors ---------- */
.sponsors-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.sponsor-card {
    background: var(--card-solid);
    border: var(--bd);
    border-radius: var(--radius-md);
    padding: 26px;
    text-align: center;
}
.sponsor-card .sponsor-name { font-weight: 700; font-size: 16px; margin-bottom: 6px; }
.sponsor-card .sponsor-tag { font-size: 13px; color: var(--ink-soft); }

/* ---------- Footer ---------- */
.site-footer {
    border-top: var(--bd);
    padding: 40px 0;
    text-align: center;
    color: var(--ink-soft);
    font-size: 14px;
}
.site-footer .flag { font-size: 16px; }

/* ---------- Floating Assistant ---------- */
.hb-widget {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
}
.hb-greeting {
    background: var(--card-solid);
    border: var(--bd);
    box-shadow: var(--shadow);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    max-width: 240px;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--ink);
    opacity: 0;
    transform: translateY(10px) scale(0.95);
    transition: opacity .35s ease, transform .35s ease;
    pointer-events: none;
}
.hb-greeting.show { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.hb-greeting strong { color: var(--primary-dark); }

.hb-bot-btn {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 14px 30px rgba(79, 70, 229, 0.35);
    animation: hb-float 3.2s ease-in-out infinite;
}
.hb-bot-btn svg { width: 30px; height: 30px; }
@keyframes hb-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.hb-chat {
    position: fixed;
    bottom: 100px;
    left: 24px;
    width: 340px;
    max-width: calc(100vw - 32px);
    height: 460px;
    max-height: 70vh;
    background: var(--card-solid);
    border: var(--bd);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    opacity: 0;
    transform: translateY(16px) scale(0.97);
    pointer-events: none;
    transition: opacity .25s ease, transform .25s ease;
    z-index: 998;
}
.hb-chat.open { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }

.hb-chat-head {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 16px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.hb-chat-head .title { font-weight: 700; font-size: 14.5px; }
.hb-chat-head .subtitle { font-size: 11.5px; opacity: 0.85; }
.hb-close {
    background: rgba(255,255,255,.15);
    border: none;
    color: #fff;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
}

.hb-messages {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--bg-alt);
}
.hb-msg {
    max-width: 82%;
    padding: 10px 14px;
    border-radius: 14px;
    font-size: 13.5px;
    line-height: 1.5;
}
.hb-msg.bot {
    align-self: flex-start;
    background: #fff;
    border: var(--bd);
    border-bottom-left-radius: 4px;
}
.hb-msg.user {
    align-self: flex-end;
    background: var(--primary);
    color: #fff;
    border-bottom-right-radius: 4px;
}
.hb-typing {
    align-self: flex-start;
    background: #fff;
    border: var(--bd);
    border-radius: 14px;
    border-bottom-left-radius: 4px;
    padding: 10px 16px;
    display: inline-flex;
    gap: 4px;
}
.hb-typing span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--ink-faint);
    animation: hb-dot 1.2s infinite ease-in-out;
}
.hb-typing span:nth-child(2) { animation-delay: .15s; }
.hb-typing span:nth-child(3) { animation-delay: .3s; }
@keyframes hb-dot { 0%, 60%, 100% { opacity: .3; } 30% { opacity: 1; } }

.hb-input-row {
    display: flex;
    gap: 8px;
    padding: 12px;
    border-top: var(--bd);
    background: #fff;
}
.hb-input-row input {
    flex: 1;
    border: var(--bd);
    background: var(--bg-alt);
    border-radius: 999px;
    padding: 10px 16px;
    font-size: 13.5px;
    outline: none;
    font-family: inherit;
}
.hb-input-row input:focus { border-color: var(--primary); }
.hb-send {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: none;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.hb-send:hover { background: var(--primary-dark); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
    .nav-links { display: none; }
    .features-grid { grid-template-columns: 1fr; }
    .sponsors-grid { grid-template-columns: 1fr; }
    .flow-grid { flex-direction: column; }
    .flow-arrow { display: none; }
}
@media (max-width: 480px) {
    .hb-chat { left: 16px; bottom: 92px; width: calc(100vw - 32px); }
    .hb-widget { left: 16px; bottom: 16px; }
}