:root {
    --bg: #eef4ff;
    --bg-soft: #f8faff;
    --card: #ffffff;
    --ink: #0f172a;
    --muted: #5c6b8a;
    --line: #d8e4f8;
    --blue: #2563eb;
    --blue-soft: #dbeafe;
    --cyan: #0284c7;
    --cyan-soft: #e0f2fe;
    --violet: #6d28d9;
    --violet-soft: #ede9fe;
    --amber: #d97706;
    --amber-soft: #ffedd5;
    --grad: linear-gradient(135deg, #1d4ed8 0%, #2563eb 45%, #0ea5e9 100%);
    --shadow: 0 12px 40px rgba(37, 99, 235, 0.1);
    --r: 18px;
    --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[hidden] {
    display: none !important;
}

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

body {
    margin: 0;
    min-height: 100vh;
    font: 16px/1.55 var(--font);
    color: var(--ink);
    background: var(--bg);
}

.bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    background:
        radial-gradient(ellipse 70% 55% at 10% 0%, rgba(147, 197, 253, 0.45), transparent 55%),
        radial-gradient(ellipse 60% 50% at 95% 15%, rgba(186, 230, 253, 0.5), transparent 50%),
        radial-gradient(ellipse 50% 40% at 50% 100%, rgba(254, 215, 170, 0.35), transparent 55%),
        linear-gradient(180deg, #f0f6ff 0%, #eef4ff 40%, #e8f0fe 100%);
}

.bg-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.65;
}

.bg-blob--blue {
    width: min(55vw, 520px);
    height: min(55vw, 520px);
    top: -15%;
    left: -10%;
    background: rgba(96, 165, 250, 0.35);
}

.bg-blob--cyan {
    width: min(45vw, 400px);
    height: min(45vw, 400px);
    top: 30%;
    right: -12%;
    background: rgba(56, 189, 248, 0.3);
}

.bg-blob--amber {
    width: min(35vw, 280px);
    height: min(35vw, 280px);
    bottom: 5%;
    left: 25%;
    background: rgba(251, 191, 36, 0.22);
}

.shell {
    position: relative;
    z-index: 1;
    max-width: 1040px;
    margin: 0 auto;
    padding: 24px 18px 56px;
}

.topbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 18px;
    margin-bottom: 28px;
    border: 1px solid var(--line);
    border-radius: calc(var(--r) + 4px);
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: inherit;
}

.brand-icon {
    border-radius: 14px;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.2);
}

.brand-name {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}

.brand-sub {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--blue);
}

.topbar-end {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pill {
    font-size: 0.78rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid var(--line);
}

.pill--member {
    background: var(--blue-soft);
    color: var(--blue);
    border-color: #bfdbfe;
}

.pill--muted {
    background: var(--bg-soft);
    color: var(--muted);
}

.btn {
    font: inherit;
    cursor: pointer;
    border-radius: 12px;
    border: 1px solid transparent;
    padding: 10px 18px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn--primary {
    color: #fff;
    background: var(--grad);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.28);
}

.btn--primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.35);
}

.btn--ghost {
    background: #fff;
    color: var(--ink);
    border-color: var(--line);
}

.btn--ghost:hover {
    background: var(--bg-soft);
}

.btn--download {
    width: 100%;
    padding: 14px 20px;
    font-size: 1.05rem;
}

.btn-icon {
    font-size: 1.2rem;
}

.auth {
    display: flex;
    justify-content: center;
    padding: 16px 0 36px;
}

.auth-card {
    width: min(100%, 440px);
    padding: 32px 28px 36px;
    border: 1px solid var(--line);
    border-radius: calc(var(--r) + 6px);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    text-align: center;
    box-shadow: var(--shadow);
}

.auth-icon {
    border-radius: 22px;
    margin-bottom: 14px;
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.18);
}

.eyebrow {
    margin: 0 0 8px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--cyan);
}

.auth-title {
    margin: 0 0 8px;
    font-size: 1.85rem;
    color: var(--ink);
}

.auth-tagline {
    margin: 0 0 10px;
    color: #334155;
    font-weight: 500;
}

.auth-lead {
    margin: 0 0 22px;
    font-size: 0.95rem;
    color: var(--muted);
}

.auth-form {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.field span {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: #475569;
}

.field input {
    width: 100%;
    padding: 11px 12px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: var(--bg-soft);
    color: var(--ink);
    font: inherit;
}

.field input:focus {
    outline: 2px solid rgba(37, 99, 235, 0.35);
    outline-offset: 1px;
    border-color: #93c5fd;
}

.auth-links {
    margin: 20px 0 0;
    font-size: 0.88rem;
    color: var(--muted);
}

.auth-links a {
    color: var(--blue);
    font-weight: 500;
}

.msg {
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 0.9rem;
}

.msg--err {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #b91c1c;
}

.hero {
    display: grid;
    gap: 28px;
    margin-bottom: 44px;
}

@media (min-width: 860px) {
    .hero {
        grid-template-columns: 1.05fr 0.95fr;
        align-items: start;
    }
}

.hero-title {
    margin: 0 0 12px;
    font-size: clamp(1.85rem, 4vw, 2.45rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #0284c7 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-tagline {
    margin: 0 0 14px;
    font-size: 1.12rem;
    font-weight: 600;
    color: #1e40af;
}

.hero-text {
    margin: 0 0 18px;
    color: var(--muted);
    max-width: 36em;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.tag {
    font-size: 0.78rem;
    font-weight: 600;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid transparent;
}

.tag--blue {
    background: var(--blue-soft);
    color: #1d4ed8;
    border-color: #bfdbfe;
}

.tag--cyan {
    background: var(--cyan-soft);
    color: #0369a1;
    border-color: #bae6fd;
}

.tag--violet {
    background: var(--violet-soft);
    color: #5b21b6;
    border-color: #ddd6fe;
}

.tag--amber {
    background: var(--amber-soft);
    color: #b45309;
    border-color: #fed7aa;
}

.download-card {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: calc(var(--r) + 6px);
    background: linear-gradient(165deg, #ffffff 0%, #f5f9ff 100%);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.download-card.is-downloading {
    border-color: #93c5fd;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), var(--shadow);
}

.download-icon {
    border-radius: 26px;
    box-shadow: 0 16px 36px rgba(37, 99, 235, 0.15);
}

.download-body {
    width: 100%;
}

.download-title {
    margin: 0 0 6px;
    font-size: 1.35rem;
    color: var(--ink);
}

.download-sub {
    margin: 0 0 16px;
    color: var(--muted);
    font-size: 0.92rem;
}

.meta-list {
    margin: 0 0 20px;
    display: grid;
    gap: 10px;
    padding: 14px;
    border-radius: 12px;
    background: var(--bg-soft);
    border: 1px solid var(--line);
}

.meta-list div {
    display: grid;
    grid-template-columns: 88px 1fr;
    gap: 8px;
    font-size: 0.9rem;
}

.meta-list dt {
    margin: 0;
    color: var(--muted);
    font-weight: 600;
}

.meta-list dd {
    margin: 0;
    color: var(--ink);
}

.download-hint {
    margin: 14px 0 0;
    font-size: 0.82rem;
    color: var(--muted);
    line-height: 1.5;
}

.muted {
    color: var(--muted);
}

code {
    font-size: 0.85em;
    background: var(--blue-soft);
    color: #1e40af;
    padding: 2px 6px;
    border-radius: 6px;
}

.section-title {
    margin: 0 0 20px;
    font-size: 1.4rem;
    color: var(--ink);
}

.features {
    margin-bottom: 40px;
}

.feature-grid {
    display: grid;
    gap: 16px;
}

@media (min-width: 640px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.feature {
    position: relative;
    padding: 20px 20px 20px 24px;
    border: 1px solid var(--line);
    border-radius: var(--r);
    background: var(--card);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
    overflow: hidden;
}

.feature::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    border-radius: 4px 0 0 4px;
}

.feature--blue::before {
    background: linear-gradient(180deg, #3b82f6, #60a5fa);
}

.feature--cyan::before {
    background: linear-gradient(180deg, #0ea5e9, #38bdf8);
}

.feature--violet::before {
    background: linear-gradient(180deg, #7c3aed, #a78bfa);
}

.feature--amber::before {
    background: linear-gradient(180deg, #f59e0b, #fbbf24);
}

.feature--blue {
    background: linear-gradient(135deg, #fff 0%, #eff6ff 100%);
}

.feature--cyan {
    background: linear-gradient(135deg, #fff 0%, #f0f9ff 100%);
}

.feature--violet {
    background: linear-gradient(135deg, #fff 0%, #f5f3ff 100%);
}

.feature--amber {
    background: linear-gradient(135deg, #fff 0%, #fffbeb 100%);
}

.feature h3 {
    margin: 0 0 8px;
    font-size: 1.02rem;
    color: var(--ink);
}

.feature p {
    margin: 0;
    font-size: 0.92rem;
    color: var(--muted);
    line-height: 1.5;
}

.step-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 14px;
}

.step-list li {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: var(--r);
    background: rgba(255, 255, 255, 0.85);
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.06);
}

.step-num {
    flex-shrink: 0;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    font-weight: 700;
    color: #fff;
    background: var(--grad);
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.step-list strong {
    color: var(--ink);
}

.step-list p {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.foot {
    margin-top: 44px;
    padding: 28px 20px;
    border-radius: var(--r);
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.7);
    text-align: center;
    font-size: 0.88rem;
    color: var(--muted);
}

.foot-club {
    margin: 0 0 6px;
    font-weight: 700;
    color: var(--blue);
}

.foot-text {
    margin: 0 0 8px;
}

.foot-text a {
    color: var(--blue);
    font-weight: 500;
}

.foot-meta {
    margin: 0;
    font-size: 0.8rem;
}