:root {
    --green-900: #1b5e20;
    --green-700: #2e7d32;
    --green-600: #388e3c;
    --green-500: #4caf50;
    --green-300: #a5d6a7;
    --green-100: #e8f5e9;
    --ink: #22322a;
    --muted: #5d6d5e;
    --card: #ffffff;
    --warn: #b42318;
    --radius: 18px;
    --shadow: 0 10px 30px rgba(27, 94, 32, 0.10);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Microsoft YaHei', 'PingFang SC', sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #eef7ec 0%, #d9edd6 45%, #c3e3bd 100%);
    line-height: 1.7;
}

a { color: var(--green-700); }

.wrap { max-width: 900px; margin: 0 auto; padding: 0 20px; }

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.82);
    border-bottom: 1px solid rgba(46, 125, 50, 0.12);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 62px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: var(--green-900);
    font-size: 1.05rem;
}

.brand .logo {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--green-500), var(--green-700));
    display: grid;
    place-items: center;
    color: #fff;
    font-size: 1.1rem;
}

.nav-links { display: flex; gap: 18px; }

.nav-links a {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.9rem;
    font-weight: 600;
}

.nav-links a:hover { color: var(--green-700); }

/* Hero */
.hero {
    text-align: center;
    padding: 64px 0 40px;
}

.hero .badge {
    display: inline-block;
    background: var(--green-100);
    color: var(--green-700);
    border: 1px solid var(--green-300);
    padding: 5px 14px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    margin-bottom: 18px;
}

.hero h1 {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    color: var(--green-900);
    letter-spacing: -0.5px;
}

.hero p {
    max-width: 620px;
    margin: 16px auto 0;
    color: var(--muted);
    font-size: 1.02rem;
}

.cta {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 28px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 26px;
    border-radius: 14px;
    font-size: 0.98rem;
    font-weight: 700;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--green-500), var(--green-700));
    color: #fff;
    box-shadow: 0 8px 22px rgba(56, 142, 60, 0.35);
}

.btn-primary:hover { transform: translateY(-2px); }

.btn-ghost {
    background: rgba(255, 255, 255, 0.85);
    color: var(--green-700);
    border: 1px solid var(--green-300);
}

.hero .meta {
    margin-top: 16px;
    font-size: 0.82rem;
    color: var(--muted);
}

/* Sections */
section { padding: 34px 0; }

.section-title {
    font-size: 1.35rem;
    color: var(--green-900);
    margin-bottom: 6px;
}

.section-sub {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 22px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(46, 125, 50, 0.08);
}

.card .icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--green-100);
    display: grid;
    place-items: center;
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.card h3 { color: var(--green-800, #1b5e20); font-size: 1.02rem; margin-bottom: 6px; }

.card p { color: var(--muted); font-size: 0.88rem; }

/* Steps */
.steps { counter-reset: step; display: grid; gap: 14px; }

.step {
    background: var(--card);
    border-radius: var(--radius);
    padding: 18px 20px 18px 66px;
    position: relative;
    box-shadow: var(--shadow);
    border: 1px solid rgba(46, 125, 50, 0.08);
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 18px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--green-500), var(--green-700));
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
    font-size: 0.9rem;
}

.step h3 { font-size: 0.98rem; color: var(--green-900); margin-bottom: 4px; }

.step p { font-size: 0.88rem; color: var(--muted); }

.step .hint {
    display: inline-block;
    margin-top: 6px;
    font-size: 0.78rem;
    background: #f1f8e9;
    color: var(--green-700);
    padding: 3px 10px;
    border-radius: 8px;
}

/* Download */
.download {
    background: linear-gradient(135deg, var(--green-700), var(--green-900));
    border-radius: 24px;
    padding: 36px 28px;
    text-align: center;
    color: #fff;
    box-shadow: 0 18px 40px rgba(27, 94, 32, 0.30);
}

.download h2 { font-size: 1.5rem; margin-bottom: 8px; }

.download p { color: rgba(255, 255, 255, 0.85); font-size: 0.92rem; margin-bottom: 20px; }

.download .btn-primary {
    background: #fff;
    color: var(--green-800, #1b5e20);
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.18);
}

.download .fileinfo {
    margin-top: 14px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.72);
}

/* FAQ */
.faq-item {
    background: var(--card);
    border-radius: 14px;
    padding: 16px 18px;
    margin-bottom: 10px;
    border: 1px solid rgba(46, 125, 50, 0.08);
}

.faq-item h3 { font-size: 0.95rem; color: var(--green-900); margin-bottom: 4px; }

.faq-item p { font-size: 0.86rem; color: var(--muted); }

.note {
    background: #fff8f0;
    border: 1px solid #ffd9b3;
    border-left: 4px solid #f0a35e;
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 0.85rem;
    color: #8a4b14;
    margin-top: 18px;
}

/* Footer */
footer {
    margin-top: 40px;
    padding: 28px 0 40px;
    text-align: center;
    color: var(--muted);
    font-size: 0.84rem;
    border-top: 1px solid rgba(46, 125, 50, 0.12);
}

footer .author { color: var(--green-800, #1b5e20); font-weight: 700; }

footer a { text-decoration: none; }

@media (max-width: 560px) {
    .nav-links { display: none; }
    .hero { padding: 44px 0 28px; }
}