/* ================================================================
   ZfPilot Landing Page Styles
   ================================================================ */

/* ── Reset & Variables ────────────────────────────────────────── */
:root {
    --purple: #7c4dff;
    --purple-dark: #651fff;
    --purple-light: #b388ff;
    --bg: #0d0d12;
    --bg-card: #16161e;
    --bg-section: #111118;
    --text: #e8e8ed;
    --text-secondary: #9999aa;
    --border: #2a2a3a;
    --gradient: linear-gradient(135deg, #7c4dff 0%, #448aff 100%);
    --radius: 12px;
    --radius-sm: 8px;
    --max-w: 1140px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--purple-light); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-alt { background: var(--bg-section); }

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 48px;
}

/* ── Nav ──────────────────────────────────────────────────────── */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(13,13,18,.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    height: 60px;
}
.nav-brand {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.15rem; font-weight: 700; color: var(--text);
    text-decoration: none;
}
.nav-brand .logo {
    width: 32px; height: 32px; border-radius: 8px;
    background: var(--gradient);
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; color: #fff;
}
.nav-brand .badge {
    font-size: 10px; background: var(--purple); color: #fff;
    padding: 2px 6px; border-radius: 4px; font-weight: 600;
}
.nav-links {
    display: flex; align-items: center; gap: 28px;
    margin-left: auto; list-style: none;
}
.nav-links a {
    color: var(--text-secondary); font-size: .875rem; font-weight: 500;
    transition: color .2s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-cta {
    padding: 7px 18px;
    background: var(--purple);
    color: #fff !important;
    border-radius: 6px;
    font-size: .85rem;
    font-weight: 600;
    transition: background .2s;
}
.nav-cta:hover { background: var(--purple-dark); text-decoration: none !important; }

.nav-admin {
    padding: 6px 14px;
    background: transparent;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: .8rem;
    font-weight: 500;
    transition: all .2s;
}
.nav-admin:hover {
    border-color: var(--purple);
    color: var(--purple-light) !important;
    text-decoration: none !important;
}

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
    padding-top: 140px;
    padding-bottom: 100px;
    text-align: center;
    background:
        radial-gradient(ellipse 60% 50% at 50% 0%, rgba(124,77,255,.12) 0%, transparent 70%),
        var(--bg);
}
.hero-icon {
    width: 56px; height: 56px;
    margin: 0 auto 20px;
    background: var(--gradient);
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
}
.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
}
.hero h1 span { color: var(--purple-light); }
.hero-sub {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
}
.hero-badges {
    display: flex; justify-content: center; gap: 24px;
    margin-bottom: 32px;
}
.hero-badges .badge-item {
    text-align: center;
}
.hero-badges .badge-num {
    font-size: 1.6rem; font-weight: 800; color: var(--purple-light);
}
.hero-badges .badge-label {
    font-size: .8rem; color: var(--text-secondary);
}
.hero-btns {
    display: flex; justify-content: center; gap: 14px; flex-wrap: wrap;
}
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all .2s;
}
.btn-primary { background: var(--purple); color: #fff; }
.btn-primary:hover { background: var(--purple-dark); text-decoration: none; }
.btn-outline {
    background: transparent; color: var(--text);
    border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--purple); color: var(--purple-light); text-decoration: none; }

/* ── Quick Start ──────────────────────────────────────────────── */
.quickstart { padding: 60px 0 80px; }
.quickstart-tabs {
    display: flex; justify-content: center; gap: 0;
    margin-bottom: 0;
}
.quickstart-tabs button {
    padding: 10px 24px;
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    font-size: .85rem; font-weight: 600;
    cursor: pointer;
    transition: all .2s;
}
.quickstart-tabs button:first-child { border-radius: 8px 0 0 0; }
.quickstart-tabs button:last-child { border-radius: 0 8px 0 0; }
.quickstart-tabs button.active {
    background: var(--purple);
    color: #fff;
    border-color: var(--purple);
}
.quickstart-code {
    background: #1a1a24;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius) var(--radius);
    padding: 24px 28px;
    font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    font-size: .85rem;
    line-height: 1.8;
    overflow-x: auto;
    max-width: 720px;
    margin: 0 auto;
    position: relative;
}
.quickstart-code pre { white-space: pre; color: var(--text-secondary); }
.quickstart-code .comment { color: #6a6a7a; }
.quickstart-code .cmd { color: #4ec9b0; }
.quickstart-code .arg { color: #ce9178; }
.copy-btn {
    position: absolute; top: 12px; right: 12px;
    background: var(--bg-card); color: var(--text-secondary);
    border: 1px solid var(--border); border-radius: 6px;
    padding: 4px 10px; font-size: .75rem; cursor: pointer;
}
.copy-btn:hover { color: var(--text); border-color: var(--purple); }
.quickstart-features {
    display: flex; justify-content: center; gap: 32px;
    margin-top: 20px; flex-wrap: wrap;
}
.quickstart-features span {
    font-size: .8rem; color: var(--text-secondary);
}

/* ── What Is ──────────────────────────────────────────────────── */
.flow-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-bottom: 56px;
    flex-wrap: wrap;
}
.flow-node {
    text-align: center;
    padding: 28px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 200px;
}
.flow-node .icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}
.flow-node .label {
    font-weight: 700; font-size: 1rem;
}
.flow-node .sub {
    font-size: .8rem; color: var(--text-secondary); margin-top: 4px;
}
.flow-arrow {
    font-size: 1.5rem; color: var(--purple); font-weight: 700;
}
.what-points {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.what-point h4 { font-size: .95rem; margin-bottom: 6px; }
.what-point p { font-size: .85rem; color: var(--text-secondary); }

/* ── Efficiency ───────────────────────────────────────────────── */
.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}
.compare-card {
    padding: 28px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.compare-card.before { background: #1a1418; border-color: #3a2a2a; }
.compare-card.after { background: #141a1e; border-color: #1a3a3a; }
.compare-card h3 { font-size: 1rem; margin-bottom: 16px; }
.compare-card ul {
    list-style: none; padding: 0;
}
.compare-card li {
    padding: 6px 0;
    font-size: .9rem;
    color: var(--text-secondary);
}
.compare-card.before li::before { content: "\2717 "; color: #f44747; }
.compare-card.after li::before { content: "\2713 "; color: #4ec9b0; }

/* ── Features ─────────────────────────────────────────────────── */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.feature-card {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color .2s, transform .2s;
}
.feature-card:hover {
    border-color: var(--purple);
    transform: translateY(-4px);
}
.feature-card .feat-icon {
    font-size: 1.8rem;
    margin-bottom: 12px;
}
.feature-card h3 {
    font-size: 1rem; margin-bottom: 8px; font-weight: 600;
}
.feature-card p {
    font-size: .85rem; color: var(--text-secondary); line-height: 1.6;
}
.feature-card .feat-badge {
    display: inline-block;
    margin-top: 10px;
    font-size: .7rem;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(124,77,255,.15);
    color: var(--purple-light);
    font-weight: 600;
}

/* ── Steps ────────────────────────────────────────────────────── */
.steps-list {
    max-width: 640px;
    margin: 0 auto;
}
.step-item {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}
.step-item:last-child { border-bottom: none; }
.step-num {
    flex: 0 0 44px; height: 44px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 1.1rem; color: #fff;
}
.step-content h3 { font-size: 1rem; margin-bottom: 4px; }
.step-content p { font-size: .85rem; color: var(--text-secondary); }
.step-detail {
    margin-top: 8px;
    padding: 10px 14px;
    background: rgba(255,255,255,0.03);
    border-left: 3px solid var(--primary);
    border-radius: 0 8px 8px 0;
    font-size: .82rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.step-content code {
    font-family: monospace;
    background: #1a1a24;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: .8rem;
    color: #4ec9b0;
}

/* ── Compatibility ────────────────────────────────────────────── */
.compat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.compat-card {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}
.compat-card .compat-icon { font-size: 2rem; margin-bottom: 10px; }
.compat-card h3 { font-size: .95rem; margin-bottom: 8px; }
.compat-card ul {
    list-style: none; padding: 0;
    font-size: .82rem; color: var(--text-secondary);
}
.compat-card li { padding: 3px 0; }

/* ── Pricing ──────────────────────────────────────────────────── */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.price-card {
    padding: 28px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    position: relative;
    transition: border-color .2s, transform .2s;
}
.price-card:hover { transform: translateY(-4px); }
.price-card.featured {
    border-color: var(--purple);
    box-shadow: 0 0 40px rgba(124,77,255,.15);
}
.price-card .price-badge {
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: var(--purple); color: #fff;
    padding: 3px 14px; border-radius: 20px;
    font-size: .72rem; font-weight: 700;
}
.price-card h3 { font-size: .95rem; margin-bottom: 4px; }
.price-card .price-sub { font-size: .78rem; color: var(--text-secondary); margin-bottom: 16px; }
.price-card .price-amount {
    font-size: 2rem; font-weight: 800; margin-bottom: 4px;
}
.price-card .price-unit { font-size: .8rem; color: var(--text-secondary); }
.price-card .price-features {
    list-style: none; padding: 0;
    margin: 20px 0;
    text-align: left;
    font-size: .82rem;
}
.price-card .price-features li {
    padding: 5px 0;
    color: var(--text-secondary);
}
.price-card .price-features li::before { content: "\2713 "; color: var(--purple-light); }
.price-card .btn { width: 100%; justify-content: center; }

/* ── FAQ ──────────────────────────────────────────────────────── */
.faq-list {
    max-width: 720px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid var(--border);
}
.faq-q {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 18px 0;
    background: none;
    border: none;
    color: var(--text);
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
}
.faq-q .chevron {
    transition: transform .2s;
    font-size: .8rem;
    color: var(--text-secondary);
}
.faq-q.active .chevron { transform: rotate(180deg); }
.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease;
    font-size: .88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}
.faq-a-inner { padding: 0 0 18px; }

/* ── Download ─────────────────────────────────────────────────── */
.download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}
.download-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}
.download-card .dl-icon { font-size: 2.5rem; margin-bottom: 12px; }
.download-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.download-card p { font-size: .85rem; color: var(--text-secondary); margin-bottom: 20px; }

/* ── License Request ──────────────────────────────────────────── */
.license-form {
    max-width: 560px;
    margin: 0 auto;
    padding: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.license-form h3 {
    text-align: center;
    font-size: 1.15rem;
    margin-bottom: 24px;
}
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: .82rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .9rem;
    outline: none;
    font-family: inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--purple);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-msg {
    text-align: center;
    padding: 10px;
    border-radius: var(--radius-sm);
    margin-top: 12px;
    font-size: .85rem;
    display: none;
}
.form-msg.success { display: block; background: #1a3a2a; color: #4ec9b0; }
.form-msg.error { display: block; background: #3a1a1a; color: #f44747; }

/* -- Payment Modal ------------------------------------------------- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,.7);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}
.modal-overlay.active { display: flex; }

.modal-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    width: 90%;
    max-width: 420px;
    position: relative;
    animation: modalIn .25s ease;
}
@keyframes modalIn { from { opacity:0; transform:scale(.92); } to { opacity:1; transform:scale(1); } }

.modal-close {
    position: absolute;
    top: 12px; right: 16px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}
.modal-close:hover { color: var(--text); }

.modal-header { text-align: center; margin-bottom: 20px; }
.modal-header h3 { font-size: 1.15rem; margin-bottom: 4px; }
.modal-plan-info { color: var(--purple); font-size: .9rem; font-weight: 600; }

.qr-container { text-align: center; margin: 16px 0; }

.pay-method-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}
.pay-tab {
    display: flex; align-items: center; gap: 6px;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-size: .88rem;
    cursor: pointer;
    transition: all .2s ease;
}
.pay-tab svg { flex-shrink: 0; }
.pay-tab:hover { border-color: var(--text-secondary); }
.pay-tab.active[data-method="alipay"] {
    border-color: #1677FF;
    color: #1677FF;
    background: rgba(22,119,255,.08);
}
.pay-tab.active[data-method="wechat"] {
    border-color: #07C160;
    color: #07C160;
    background: rgba(7,193,96,.08);
}

.qr-img {
    width: 220px; height: 220px;
    border-radius: 8px;
    border: 3px solid var(--border);
    background: #fff;
    object-fit: contain;
}
.qr-hint { color: var(--text-secondary); font-size: .82rem; margin-top: 8px; }

.payment-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: .88rem;
    color: var(--text-secondary);
    padding: 12px 0;
}
.spinner {
    width: 18px; height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--purple);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.modal-success, .modal-free-success {
    text-align: center;
    padding: 16px 0;
}
.success-icon { font-size: 2.5rem; margin-bottom: 8px; }
.modal-success h3, .modal-free-success h3 { font-size: 1.1rem; margin-bottom: 8px; }
.modal-success p, .modal-free-success p { color: var(--text-secondary); font-size: .88rem; margin-bottom: 8px; }

.license-code-display {
    background: var(--bg);
    border: 2px dashed var(--purple);
    border-radius: var(--radius-sm);
    padding: 14px 20px;
    font-family: 'Fira Code', 'Cascadia Code', monospace;
    font-size: 1.15rem;
    letter-spacing: 2px;
    color: #4ec9b0;
    margin: 12px 0;
    word-break: break-all;
    user-select: all;
}
.license-hint { font-size: .82rem; color: var(--text-secondary); margin-bottom: 12px; }
.copy-license-btn { width: 100%; justify-content: center; }

/* -- Footer ------------------------------------------------- */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: .82rem;
    color: var(--text-secondary);
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 12px;
}
.footer-links a { color: var(--text-secondary); transition: color .2s; }
.footer-links a:hover { color: var(--text); }

/* ── Mobile ───────────────────────────────────────────────────── */
.mobile-menu-btn {
    display: none;
    background: none; border: none;
    color: var(--text); font-size: 1.5rem;
    cursor: pointer; margin-left: auto;
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: block; }
    .nav-links.open {
        display: flex; flex-direction: column;
        position: absolute; top: 60px; left: 0; right: 0;
        background: var(--bg);
        padding: 20px;
        border-bottom: 1px solid var(--border);
    }
    .hero h1 { font-size: 1.8rem; }
    .flow-diagram { flex-direction: column; }
    .flow-arrow { transform: rotate(90deg); }
    .what-points,
    .features-grid,
    .compat-grid { grid-template-columns: 1fr; }
    .compare-grid,
    .pricing-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1024px) and (min-width: 769px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}