/* ============================================================
   OKAI 官网 V2 · clay 暖调 · 场景驱动
   品牌色沿用 V1：clay 橙 #d97757 / 暖白 #faf9f5 / 深褐黑 #29261b
   ============================================================ */
:root {
    --color-primary: #d97757;
    --color-primary-dark: #c46545;
    --color-primary-light: #e8917a;
    --color-life: #6b8f71;          /* 生活流：苔藓绿 · 跟 clay 互补 */
    --color-life-dark: #577a5d;
    --color-bg: #faf9f5;
    --color-bg-alt: #f5f3ed;
    --color-bg-warm: #f3ede4;
    --color-bg-white: #ffffff;
    --color-text: #29261b;
    --color-text-secondary: #5a5549;
    --color-text-muted: #8a8577;
    --color-border: #e5e2d9;
    --shadow-sm: 0 2px 8px rgba(41, 38, 27, 0.06);
    --shadow-md: 0 6px 24px rgba(41, 38, 27, 0.09);
    --shadow-lg: 0 16px 50px rgba(41, 38, 27, 0.14);
    --shadow-clay: 0 10px 30px rgba(217, 119, 87, 0.22);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-height: 64px;
    --maxw: 1140px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    overflow-x: hidden;
}
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.icon { width: 18px; height: 18px; flex-shrink: 0; }
img { max-width: 100%; display: block; }

h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); font-weight: 720; letter-spacing: 0.02em; line-height: 1.35; text-align: center; }
.section-desc { text-align: center; color: var(--color-text-muted); font-size: 1.05rem; line-height: 1.75; margin-top: 14px; }

/* ============ Nav ============ */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    height: var(--nav-height);
    background: rgba(250, 249, 245, 0.78);
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    transition: var(--transition);
}
.navbar.scrolled { background: rgba(250, 249, 245, 0.95); box-shadow: 0 1px 0 var(--color-border); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--color-text); }
.nav-logo { width: 32px; height: 32px; border-radius: 8px; }
.nav-title { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.01em; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
    color: var(--color-text-secondary); text-decoration: none; font-size: 0.92rem;
    padding: 7px 12px; border-radius: var(--radius-full); transition: var(--transition);
}
.nav-link:hover { color: var(--color-text); background: var(--color-bg-warm); }
.nav-cta {
    background: var(--color-primary); color: #fff; text-decoration: none;
    font-size: 0.9rem; font-weight: 600; padding: 9px 18px; border-radius: var(--radius-full);
    transition: var(--transition); box-shadow: var(--shadow-sm);
}
.nav-cta:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-clay); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 22px; height: 2px; background: var(--color-text); border-radius: 2px; transition: var(--transition); }

/* ============ Hero ============ */
/* 首屏 = 一整屏的视觉构图(一幕) · 上方留白 · 按钮压下方 */
/* 主视觉居中 · 顶部留白 · 按钮压到下方 */
.hero {
    min-height: 100vh; display: flex; flex-direction: column; justify-content: center;
    text-align: center; background: var(--color-bg);
    padding: calc(var(--nav-height) + 7vh) 0 7vh;
}
.hero .container { position: relative; z-index: 1; }
/* 名字当主视觉 · 铺得宽 · 无手势无方块 · 行少 */
/* 一句话当主视觉:句子 大 > 解释 小 > 宽按钮压底 */
.hero-slogan {
    font-size: clamp(2.2rem, 6vw, 4rem); font-weight: 800; line-height: 1.2;
    letter-spacing: 0.03em; margin-bottom: 38px;
}
.hero-accent { color: var(--color-primary); }
.hero-sub { font-size: clamp(1rem, 1.9vw, 1.2rem); color: var(--color-text-secondary); line-height: 2.1; letter-spacing: 0.02em; margin: 0 auto; max-width: 760px; }
/* 按钮:加宽加重 · 压到下方给整屏压舱 */
.hero-buttons { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; margin-top: 96px; }
.hero-buttons .btn { font-size: 1.15rem; padding: 22px 64px; }
.hero-buttons .btn-primary { box-shadow: 0 16px 40px rgba(217,119,87,0.38); }
.hero-note { color: var(--color-text-muted); font-size: 0.88rem; letter-spacing: 0.02em; }

/* ============ Buttons ============ */
.btn {
    display: inline-flex; align-items: center; gap: 9px; cursor: pointer;
    font-size: 1rem; font-weight: 600; padding: 13px 26px; border-radius: var(--radius-full);
    border: none; text-decoration: none; transition: var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-clay); }
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); }
.btn-secondary { background: var(--color-bg-white); color: var(--color-text); border: 1px solid var(--color-border); box-shadow: var(--shadow-sm); }
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-2px); }
.btn-lg { font-size: 1.08rem; padding: 16px 34px; }

/* download dropdown */
.download-dropdown { position: relative; }
.dl-trigger { position: relative; }
.dl-chevron-icon { width: 16px; height: 16px; transition: transform 0.2s; }
.dl-trigger.open .dl-chevron-icon { transform: rotate(180deg); }
.dl-menu {
    position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%);
    background: var(--color-bg-white); border: 1px solid var(--color-border); border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg); padding: 8px; width: 320px; z-index: 50; text-align: left;
}
.dl-up-wrap { position: relative; display: inline-block; }
.dl-up-wrap .dl-menu { top: auto; bottom: calc(100% + 10px); }
.nav-dl { display: inline-block; position: relative; }
.nav-dl .dl-menu { right: 0; left: auto; transform: none; }
/* button reset · 浏览器对 <button> 元素的 native border + focus ring 全清掉 */
button.dl-trigger, button.nav-cta {
    border: 0 !important;
    outline: 0 !important;
    -webkit-appearance: none !important;
    appearance: none !important;
    background-image: none;
    cursor: pointer;
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
}
button.dl-trigger:focus, button.nav-cta:focus,
button.dl-trigger:focus-visible, button.nav-cta:focus-visible,
button.dl-trigger:active, button.nav-cta:active {
    outline: 0 !important;
    border: 0 !important;
}
/* nav-cta 保留它原本的 background / shadow，focus 时不变 */
button.nav-cta:focus, button.nav-cta:focus-visible {
    background: var(--color-primary);
    box-shadow: var(--shadow-sm);
}
.dl-menu-item { display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: var(--radius-sm); text-decoration: none; color: var(--color-text); transition: var(--transition); }
.dl-menu-item:hover { background: var(--color-bg-warm); }
.dl-menu-icon { width: 24px; height: 24px; color: var(--color-text-secondary); flex-shrink: 0; }
.dl-menu-info { display: flex; flex-direction: column; }
.dl-menu-name { font-weight: 600; font-size: 0.95rem; }
.dl-menu-sub { font-size: 0.78rem; color: var(--color-text-muted); }
.dl-menu-footer { text-align: center; font-size: 0.78rem; color: var(--color-text-muted); padding: 10px 0 4px; border-top: 1px solid var(--color-border); margin-top: 6px; }

/* ============ 世界为你所用 ============ */
.world { padding: 96px 0; background: var(--color-bg-warm); }
.world-body { max-width: 760px; margin: 24px auto 0; text-align: center; color: var(--color-text-secondary); font-size: clamp(1.05rem, 2.1vw, 1.25rem); line-height: 2; }
.world-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 48px; }
.world-card { background: var(--color-bg-white); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 28px 22px; text-align: center; transition: var(--transition); }
.world-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.world-ico { font-size: 1.9rem; display: block; margin-bottom: 12px; }
.world-card h3 { font-size: 1.05rem; font-weight: 660; margin-bottom: 8px; }
.world-card p { color: var(--color-text-secondary); font-size: 0.92rem; line-height: 1.7; }
.world-punch { text-align: center; margin-top: 44px; font-size: clamp(1.2rem, 2.7vw, 1.65rem); font-weight: 720; letter-spacing: 0.02em; }

/* ============ AI 进你的空间 · 4 空间 ============ */
.space { padding: 92px 0; background: var(--color-bg); }
.space-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 52px; }
.space-card {
    background: var(--color-bg-white); border: 1px solid var(--color-border); border-radius: var(--radius-md);
    padding: 32px 24px; text-align: center; transition: var(--transition);
}
.space-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.space-ico { font-size: 2rem; display: block; margin-bottom: 14px; }
.space-card h3 { font-size: 1.15rem; font-weight: 680; margin-bottom: 8px; }
.space-card p { color: var(--color-text-secondary); font-size: 0.94rem; line-height: 1.7; }

/* ============ Flow (工作流 / 生活流) ============ */
.flow { padding: 84px 0; }
.flow-life { background: linear-gradient(180deg, #f4f6f2 0%, #faf9f5 100%); }
.flow-head { text-align: left; margin-bottom: 44px; }
.flow-head h2 { text-align: left; }
.flow-head .section-desc { text-align: left; margin: 12px 0 0; }
.flow-label {
    display: inline-block; font-size: 0.92rem; font-weight: 700; letter-spacing: 0.06em;
    color: var(--color-primary); background: rgba(217,119,87,0.1);
    padding: 6px 16px; border-radius: var(--radius-full); margin-bottom: 18px;
}
.flow-label-life { color: var(--color-life-dark); background: rgba(107,143,113,0.14); }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.result-card {
    background: var(--color-bg-white); border: 1px solid var(--color-border); border-radius: var(--radius-md);
    padding: 26px 24px; transition: var(--transition); position: relative; overflow: hidden;
}
.result-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 3px; height: 100%;
    background: var(--color-primary); transform: scaleY(0); transform-origin: top; transition: transform 0.25s;
}
.result-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.result-card:hover::before { transform: scaleY(1); }
.result-card.life::before { background: var(--color-life); }
.result-card h3 { font-size: 1.18rem; font-weight: 680; margin-bottom: 10px; }
.result-card p { color: var(--color-text-secondary); font-size: 0.96rem; }
.result-meta { display: flex; align-items: center; gap: 10px; margin-top: 18px; font-size: 0.84rem; }
.result-meta .before { color: var(--color-text-muted); text-decoration: line-through; text-decoration-color: var(--color-border); }
.result-meta .arrow { color: var(--color-primary); font-weight: 700; }
.result-meta .after { color: var(--color-primary); font-weight: 650; }

/* ============ 为谁而生 ============ */
.who { padding: 84px 0; background: var(--color-bg-warm); }
.who-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 48px; }
.who-card {
    background: var(--color-bg-white); border-radius: var(--radius-lg); padding: 32px 24px;
    border: 1px solid var(--color-border); transition: var(--transition); text-align: center;
}
.who-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.who-emoji { font-size: 2.3rem; margin-bottom: 14px; }
.who-card h3 { font-size: 1.18rem; font-weight: 700; margin-bottom: 12px; }
.who-card p { color: var(--color-text-secondary); font-size: 0.92rem; text-align: left; line-height: 1.75; }

/* ============ 不一样 ============ */
.diff { padding: 84px 0; }
.diff-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 48px; }
.diff-card {
    background: var(--color-bg-white); border: 1px solid var(--color-border); border-radius: var(--radius-md);
    padding: 28px 24px; transition: var(--transition);
}
.diff-card.highlight { border-color: rgba(217,119,87,0.35); background: linear-gradient(165deg, #fff 0%, #fdf6f2 100%); }
.diff-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.diff-card h3 { font-size: 1.12rem; font-weight: 700; margin-bottom: 10px; color: var(--color-primary); }
.diff-card p { color: var(--color-text-secondary); font-size: 0.94rem; }

/* ============ 开始 + 价格 ============ */
.start { padding: 84px 0; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 880px; margin: 48px auto 0; }
.step { text-align: center; padding: 12px; }
.step-number {
    width: 52px; height: 52px; border-radius: 50%; background: var(--color-primary); color: #fff;
    font-size: 1.3rem; font-weight: 700; display: flex; align-items: center; justify-content: center;
    margin: 0 auto 18px; box-shadow: var(--shadow-clay);
}
.step h3 { font-size: 1.15rem; font-weight: 680; margin-bottom: 8px; }
.step p { color: var(--color-text-secondary); font-size: 0.95rem; }
.price-band {
    margin-top: 64px; background: linear-gradient(135deg, #2e2a1e 0%, #3d3528 100%); color: #faf9f5;
    border-radius: var(--radius-lg); padding: 48px 40px; display: flex; flex-wrap: wrap;
    align-items: center; justify-content: space-between; gap: 28px;
}
.price-headline h3 { font-size: 1.3rem; font-weight: 600; color: var(--color-primary-light); margin-bottom: 10px; }
.price-big { font-size: clamp(1.5rem, 3.5vw, 2.1rem); font-weight: 760; letter-spacing: -0.02em; }
.price-sub { color: #c9c3b4; font-size: 0.95rem; margin-top: 8px; }

/* ============ FAQ ============ */
.faq { padding: 84px 0; background: var(--color-bg-warm); }
.faq-list { max-width: 760px; margin: 48px auto 0; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    background: var(--color-bg-white); border: 1px solid var(--color-border); border-radius: var(--radius-md);
    padding: 4px 24px; transition: var(--transition);
}
.faq-item[open] { box-shadow: var(--shadow-sm); border-color: rgba(217,119,87,0.3); }
.faq-item summary {
    cursor: pointer; list-style: none; padding: 18px 0; font-size: 1.05rem; font-weight: 600;
    display: flex; align-items: center; justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.5rem; font-weight: 400; color: var(--color-primary); transition: transform 0.2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { color: var(--color-text-secondary); font-size: 0.96rem; padding: 0 0 20px; }

/* ============ Final CTA ============ */
/* 最后一屏:看完故事的收口总结 + 下载 */
.final-cta { padding: 104px 0; text-align: center; background: var(--color-bg-warm); }
.final-mark { width: 60px; height: auto; margin: 0 auto 20px; filter: drop-shadow(0 8px 20px rgba(217,119,87,0.26)); }
.final-label { display: inline-block; font-size: 1rem; font-weight: 700; letter-spacing: 0.12em; color: var(--color-primary); margin-bottom: 16px; }
.final-cta h2 { margin-bottom: 22px; }
.final-summary { max-width: 720px; margin: 0 auto 32px; color: var(--color-text-secondary); font-size: clamp(1.05rem, 2vw, 1.2rem); line-height: 1.95; letter-spacing: 0.02em; }
.cta-couplet { margin-bottom: 26px; }
.cta-couplet p { font-size: clamp(1.15rem, 2.5vw, 1.55rem); font-weight: 640; line-height: 2.1; letter-spacing: 0.03em; color: var(--color-text); }
.final-slogan { font-size: clamp(1.3rem, 3vw, 2rem); font-weight: 760; letter-spacing: 0.03em; margin-bottom: 34px; }

/* ============ Footer ============ */
.footer { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); padding: 52px 0 36px; }
/* 横排:logo 左 · 链接 中 · 二维码 右 */
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; }
.footer-logo { width: 30px; height: 30px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 26px; }
.footer-links a { color: var(--color-text-secondary); text-decoration: none; font-size: 0.95rem; transition: var(--transition); }
.footer-links a:hover { color: var(--color-primary); }
.footer-qr { display: flex; align-items: center; gap: 12px; }
.footer-qr-img { width: 64px; height: 64px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.footer-qr-label { font-size: 0.8rem; color: var(--color-text-muted); line-height: 1.5; }
.footer-copy { text-align: center; color: var(--color-text-muted); font-size: 0.85rem; margin-top: 32px; padding-top: 26px; border-top: 1px solid var(--color-border); }

/* ============ Responsive ============ */
@media (max-width: 920px) {
    .result-grid, .who-grid, .bay-grid, .space-grid, .world-grid { grid-template-columns: repeat(2, 1fr); }
    .diff-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: 1fr; max-width: 380px; }
}
@media (max-width: 720px) {
    .nav-links {
        position: fixed; top: var(--nav-height); left: 0; right: 0;
        flex-direction: column; align-items: stretch; gap: 0; padding: 8px 16px 16px;
        background: rgba(250,249,245,0.98); backdrop-filter: blur(14px);
        box-shadow: var(--shadow-md); transform: translateY(-120%); transition: transform 0.25s; z-index: 90;
    }
    .nav-links.open { transform: translateY(0); }
    .nav-link { padding: 12px 14px; border-radius: var(--radius-sm); }
    .nav-cta { display: none; }
    .nav-toggle { display: flex; }
    .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle.open span:nth-child(2) { opacity: 0; }
    .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
    .result-grid, .who-grid, .bay-grid, .diff-grid, .trio-grid, .space-grid, .world-grid, .intro-points { grid-template-columns: 1fr; }
    .pain-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-row { flex-direction: column; align-items: center; text-align: center; gap: 22px; }
    .price-band { flex-direction: column; text-align: center; }
    .cap-row { padding: 20px 0; }
    .hero { padding-top: calc(var(--nav-height) + 40px); }
}