/* ===== Variables & Reset ===== */
:root {
    --bg: #0a0e17;
    --bg-card: #111827;
    --bg-card-hover: #162032;
    --bg-code: #0f172a;
    --text: #e2e8f0;
    --text-dim: #94a3b8;
    --text-muted: #64748b;
    --accent: #00d2ff;
    --accent2: #0284c7;
    --gradient: linear-gradient(135deg, #00f2fe, #0ea5e9, #2563eb);
    --glow: rgba(0, 210, 255, 0.12);
    --glow-shadow: 0 0 30px rgba(0, 210, 255, 0.15);
    --border: rgba(255, 255, 255, 0.07);
    --border-h: rgba(255, 255, 255, 0.14);
    --radius: 12px;
    --radius-lg: 16px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', monospace;
    --ease: 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: 24px; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
.container { max-width: 920px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }

/* ===== Background ===== */
.bg-grid {
    position: fixed; inset: 0; z-index: -3; pointer-events: none;
    background-image:
        linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
    background-size: 60px 60px;
}
.bg-glow {
    position: fixed; border-radius: 50%; filter: blur(130px);
    z-index: -2; pointer-events: none;
    animation: drift 18s ease-in-out infinite;
}
.bg-glow-1 { width: 550px; height: 550px; background: rgba(0, 242, 254, 0.07); top: -180px; right: -180px; }
.bg-glow-2 { width: 450px; height: 450px; background: rgba(37, 99, 235, 0.07); bottom: -120px; left: -120px; animation-delay: -6s; }
.bg-glow-3 { width: 350px; height: 350px; background: rgba(14, 165, 233, 0.05); top: 45%; left: 50%; animation-delay: -12s; }
@keyframes drift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(25px, -18px) scale(1.04); }
    66% { transform: translate(-18px, 18px) scale(0.96); }
}

/* ===== Language Toggle ===== */
.lang-switch {
    position: fixed;
    top: 20px;
    right: 24px;
    z-index: 999;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--text);
    font-family: var(--font);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all .25s var(--ease);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
    user-select: none;
}
.lang-switch:hover {
    border-color: rgba(0, 210, 255, 0.45);
    background: rgba(22, 32, 50, 0.9);
    box-shadow: 0 4px 24px rgba(0, 210, 255, 0.22);
    transform: translateY(-2px);
}
.lang-switch:active {
    transform: translateY(0);
}
.lang-icon {
    font-size: 14px;
    line-height: 1;
}
.lang-code {
    color: var(--accent);
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* ===== Hero ===== */
.hero { padding: 40px 0 16px; text-align: center; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; font-size: 13px; font-weight: 500;
    color: var(--accent); background: var(--glow);
    border: 1px solid rgba(0, 210, 255, 0.2); border-radius: 100px;
    margin-bottom: 14px; animation: fadeUp .7s ease;
}
.hero-title {
    font-size: clamp(36px, 5.5vw, 58px); font-weight: 900;
    line-height: 1.1; letter-spacing: -2px; margin-bottom: 10px;
    animation: fadeUp .7s ease .08s both;
}
.gradient-text {
    background: var(--gradient); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-sub {
    font-size: 16px; color: var(--text-dim); max-width: 520px;
    margin: 0 auto 20px; line-height: 1.6;
    animation: fadeUp .7s ease .16s both;
}
.hero-actions {
    display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
    margin-bottom: 32px; animation: fadeUp .7s ease .24s both;
}
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 13px 26px; font-size: 14px; font-weight: 600;
    font-family: var(--font); color: #fff; background: var(--gradient);
    border-radius: 10px; border: none; cursor: pointer;
    box-shadow: 0 4px 24px rgba(0, 210, 255, 0.28); transition: .25s var(--ease);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0, 210, 255, 0.38); }
.btn-ghost {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 13px 24px; font-size: 14px; font-weight: 600;
    font-family: var(--font); background: rgba(255,255,255,0.04);
    border: 1px solid var(--border); border-radius: 10px;
    transition: .25s var(--ease); cursor: pointer;
}
.btn-ghost:hover { background: rgba(255,255,255,0.07); border-color: var(--border-h); transform: translateY(-2px); }

/* Hero stats */
.hero-stats {
    display: flex; align-items: center; justify-content: center;
    gap: 28px; flex-wrap: wrap;
    animation: fadeUp .7s ease .32s both;
}
.stat { display: flex; align-items: center; gap: 10px; text-align: left; }
.stat svg { color: var(--accent); flex-shrink: 0; opacity: .8; }
.stat-val { display: block; font-size: 15px; font-weight: 700; color: var(--text); font-family: var(--mono); }
.stat-label { display: block; font-size: 12px; color: var(--text-muted); }
.stat-div { width: 1px; height: 36px; background: var(--border); }

/* ===== Section header ===== */
.section-head { text-align: center; margin-bottom: 22px; }
.section-badge {
    display: inline-block; padding: 5px 14px;
    background: var(--glow); border: 1px solid rgba(0, 210, 255, 0.18);
    border-radius: 100px; font-size: 12px; font-weight: 600;
    color: var(--accent); text-transform: uppercase; letter-spacing: 1px;
    margin-bottom: 8px;
}
.section-head h2 { font-size: clamp(24px, 3.5vw, 34px); font-weight: 800; letter-spacing: -0.8px; }

/* ===== Addresses ===== */
.addresses { padding: 20px 0 60px; }
.addr-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.addr-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden;
    transition: .3s var(--ease); position: relative;
}
.addr-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: var(--gradient); opacity: 0; transition: .3s;
}
.addr-card:hover { border-color: var(--border-h); transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,0.3); }
.addr-card:hover::before { opacity: 1; }
.addr-card.featured { border-color: rgba(0, 210, 255, 0.28); box-shadow: var(--glow-shadow); }
.addr-card.featured::before { opacity: 1; }
.addr-header {
    display: flex; align-items: center; gap: 10px;
    padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.addr-proto { font-family: var(--mono); font-size: 15px; font-weight: 700; color: var(--accent); }
.addr-badge { font-size: 12px; color: var(--text-muted); }
.addr-body { display: flex; align-items: center; gap: 10px; padding: 16px 20px; }
.addr-label { font-size: 12px; font-weight: 500; color: var(--text-muted); min-width: 32px; }
.addr-val {
    flex: 1; font-family: var(--mono); font-size: 13px;
    background: var(--bg-code); padding: 9px 14px;
    border-radius: 8px; border: 1px solid var(--border);
    word-break: break-all; color: var(--text);
}
.copy-btn {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 36px; flex-shrink: 0;
    background: rgba(255,255,255,0.04); border: 1px solid var(--border);
    border-radius: 8px; color: var(--text-muted);
    cursor: pointer; transition: .25s var(--ease);
}
.copy-btn:hover { background: var(--glow); border-color: rgba(0, 210, 255, 0.25); color: var(--accent); }
.addr-foot {
    padding: 10px 20px; border-top: 1px solid var(--border);
    font-size: 12px; color: var(--text-muted);
}
.addr-foot.accent { color: var(--accent); background: var(--glow); }

/* ===== Setup ===== */
.setup { padding: 60px 0 70px; }
.tabs {
    display: flex; gap: 6px; flex-wrap: wrap; justify-content: center;
    padding: 5px; margin-bottom: 22px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.tab {
    display: flex; align-items: center; gap: 7px;
    padding: 10px 18px; background: none; border: none;
    color: var(--text-dim); font-family: var(--font);
    font-size: 13px; font-weight: 500; cursor: pointer;
    border-radius: 10px; transition: .25s var(--ease);
}
.tab:hover { color: var(--text); background: rgba(255,255,255,0.04); }
.tab.active { color: #fff; background: var(--gradient); box-shadow: 0 2px 14px rgba(0, 210, 255, 0.3); }
.tab svg { flex-shrink: 0; }

/* Panes */
.pane {
    display: none;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px;
    animation: fadeIn .35s ease;
}
.pane.active { display: block; }
.pane h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.pane-note {
    color: var(--text-dim); font-size: 14px;
    margin-bottom: 20px; padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}
.pane p { font-size: 14px; color: var(--text-dim); line-height: 1.7; margin-bottom: 10px; }
.pane code {
    font-family: var(--mono); font-size: 12px; color: var(--accent);
    background: var(--bg-code); padding: 2px 7px; border-radius: 4px;
}

/* Steps */
.steps { display: flex; flex-direction: column; gap: 22px; }
.step { display: flex; gap: 18px; }
.step-num {
    display: flex; align-items: center; justify-content: center;
    width: 34px; height: 34px; min-width: 34px;
    background: var(--glow); border: 1px solid rgba(0, 210, 255, 0.25);
    border-radius: 50%; font-size: 14px; font-weight: 700;
    color: var(--accent);
}
.step-body { flex: 1; min-width: 0; }
.step-body h4 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.step-body p { font-size: 14px; color: var(--text-dim); line-height: 1.7; margin-bottom: 8px; }
.step-body p:last-child { margin-bottom: 0; }
.step-body p strong { color: var(--text); }

/* Code blocks */
.code-block {
    background: var(--bg-code); border: 1px solid var(--border);
    border-radius: 10px; overflow: hidden; margin: 10px 0;
}
.code-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: 9px 16px; border-bottom: 1px solid var(--border);
    background: rgba(255,255,255,0.015);
}
.code-head span { font-size: 11px; font-weight: 500; color: var(--text-muted); font-family: var(--mono); }
.copy-code-btn {
    font-size: 11px; font-family: var(--font); font-weight: 500;
    color: var(--accent); background: none; border: none;
    cursor: pointer; padding: 3px 7px; border-radius: 4px; transition: .2s;
}
.copy-code-btn:hover { background: var(--glow); }
.code-block pre { padding: 14px 16px; overflow-x: auto; }
.code-block code {
    font-family: var(--mono); font-size: 13px; line-height: 1.7;
    color: var(--text); background: none; padding: 0;
}
.code-block code strong { color: var(--accent); font-weight: 600; }

/* Alt box */
.alt-box {
    margin-top: 28px; padding: 20px;
    background: rgba(255,255,255,0.02); border: 1px solid var(--border);
    border-radius: 10px;
}
.alt-box h4 { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.alt-box p { font-size: 13px; color: var(--text-dim); line-height: 1.7; margin: 0; }

/* ===== Footer ===== */
.footer { padding: 36px 0; border-top: 1px solid var(--border); text-align: center; }
.footer-brand { font-size: 18px; font-weight: 800; margin-bottom: 6px; }
.footer p { font-size: 13px; color: var(--text-muted); margin-bottom: 14px; }
.footer-codes { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.footer-codes code { font-family: var(--mono); font-size: 12px; color: var(--text-dim); }
.footer-codes span { color: var(--text-muted); }
.saf-link {
    color: var(--accent);
    font-weight: 700;
    text-decoration: underline;
    text-decoration-color: rgba(0, 210, 255, 0.45);
    text-underline-offset: 3px;
    padding: 1px 5px;
    border-radius: 4px;
    transition: all .2s var(--ease);
    display: inline-block;
}
.saf-link:hover {
    color: #fff;
    background: rgba(0, 210, 255, 0.22);
    text-decoration-color: var(--accent);
    box-shadow: 0 0 12px rgba(0, 210, 255, 0.4);
}

/* ===== Toast ===== */
.toast {
    position: fixed; bottom: 28px; left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
    color: #fff;
    padding: 10px 24px; border-radius: 10px;
    font-size: 13px; font-weight: 500;
    box-shadow: 0 8px 30px rgba(0, 210, 255, 0.35);
    z-index: 1000; transition: transform .3s ease; pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ===== Animations ===== */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .lang-switch { top: 12px; right: 14px; padding: 6px 12px; font-size: 12px; }
    .addr-grid { grid-template-columns: 1fr; }
    .hero { padding: 32px 0 16px; }
    .hero-stats { gap: 18px; }
    .stat-div { display: none; }
    .pane { padding: 24px; }
    .tab span { display: none; }
    .tab { padding: 10px 13px; }
    .step { gap: 12px; }
    .addr-body { flex-wrap: wrap; }
    .addr-label { width: 100%; }
    .footer-codes { flex-direction: column; gap: 6px; }
    .footer-codes span { display: none; }
}
@media (max-width: 480px) {
    .hero-actions { flex-direction: column; align-items: center; }
    .btn-primary, .btn-ghost { width: 100%; justify-content: center; }
}