/* ============================================================
   易陪练产品页 · 设计系统
   方案名：成长紫（Growth Purple）
   Primary  #6D5EFC / #9B5CFF（紫=成长·专注·进取）
   Tertiary #FF7A59 珊瑚（陪伴与鼓励的温度）
   ============================================================ */

:root {
    --brand: #6D5EFC;
    --brand2: #9B5CFF;
    --brand-soft: #EFECFF;
    --coral: #FF7A59;
    --coral-soft: #FFEEE7;
    --ink: #1C1B2E;
    --text: #2B2942;
    --text2: #5A5872;
    --line: #E9E8F4;
    --paper: #F7F6FC;
    --card: #FFFFFF;
    --radius: 18px;
    --shadow: 0 18px 50px rgba(48, 34, 120, .10);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--paper);
    line-height: 1.7;
    overflow-x: hidden;
}

.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.25; font-weight: 700; }

h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); letter-spacing: -.01em; margin-bottom: 14px; }

section { padding: 88px 0; }

a { text-decoration: none; color: inherit; }

.mono { font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace; letter-spacing: .12em; }

.eyebrow {
    font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    font-size: .76rem;
    letter-spacing: .28em;
    color: var(--brand2);
    margin-bottom: 16px;
}

.section-subtitle { color: var(--text2); font-size: 1.04rem; max-width: 620px; margin-bottom: 52px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: 999px;
    font-weight: 600;
    font-size: .95rem;
    transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
    cursor: pointer;
}

:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 6px; }

/* ---------- 顶部导航 ---------- */
header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, .82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
}

.header-container { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; }

.logo { display: flex; align-items: center; gap: 10px; }
.logo-glyph { display: inline-flex; }
.logo-text { font-size: 1.25rem; font-weight: 700; color: var(--brand); letter-spacing: .02em; }

nav ul { display: flex; list-style: none; gap: 4px; }

nav ul li a {
    color: var(--text2);
    font-size: .92rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 999px;
    transition: color .2s ease, background .2s ease;
}

nav ul li a:hover, nav ul li a.active { color: var(--brand); background: var(--brand-soft); }

.primary-btn {
    background: linear-gradient(120deg, var(--brand), var(--brand2));
    color: #fff;
}

.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(109, 94, 252, .32); color: #fff; }

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: 160px 0 100px;
    background:
        radial-gradient(900px 480px at 82% -8%, rgba(155, 92, 255, .16) 0%, transparent 60%),
        radial-gradient(720px 420px at 8% 108%, rgba(255, 122, 89, .12) 0%, transparent 60%),
        linear-gradient(180deg, #F4F1FF 0%, var(--paper) 100%);
    overflow: hidden;
    text-align: center;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(109, 94, 252, .07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(109, 94, 252, .07) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: radial-gradient(720px 460px at 50% 20%, #000 0%, transparent 78%);
    -webkit-mask-image: radial-gradient(720px 460px at 50% 20%, #000 0%, transparent 78%);
    pointer-events: none;
}

.hero .container { position: relative; z-index: 2; }

.hero h1 {
    font-size: clamp(2.1rem, 4.8vw, 3.3rem);
    letter-spacing: -.02em;
    color: var(--ink);
    margin-bottom: 18px;
}

.hero .subtitle { font-size: clamp(1rem, 1.5vw, 1.14rem); color: var(--text2); margin-bottom: 34px; }

.hero-tags { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }

.hero-tag {
    font-size: .86rem;
    font-weight: 600;
    color: var(--brand);
    padding: 8px 18px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid rgba(109, 94, 252, .28);
    box-shadow: 0 6px 18px rgba(109, 94, 252, .10);
}

/* ---------- 陪练闭环 ---------- */
.loop { background: #fff; }

.loop-track {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 22px;
    counter-reset: step;
}

.loop-step {
    position: relative;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 26px;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.loop-step:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow);
    border-color: rgba(109, 94, 252, .35);
}

.step-no {
    display: inline-block;
    font-size: .8rem;
    color: var(--brand);
    background: var(--brand-soft);
    border: 1px solid rgba(109, 94, 252, .25);
    border-radius: 8px;
    padding: 4px 10px;
    margin-bottom: 14px;
}

.loop-step h3 { font-size: 1.14rem; margin-bottom: 8px; }
.loop-step p { color: var(--text2); font-size: .93rem; }

/* 第六步高亮为「回到计划」的回流提示 */
.loop-step:last-child {
    border-color: rgba(255, 122, 89, .4);
    background: linear-gradient(160deg, var(--coral-soft) 0%, #fff 70%);
}

.loop-step:last-child .step-no {
    color: var(--coral);
    background: #fff;
    border-color: rgba(255, 122, 89, .35);
}

/* ---------- 陪练形态 ---------- */
.modes { background: var(--paper); }

.mode-chips {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.mode-chip {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 20px 22px;
    font-weight: 700;
    font-size: 1.02rem;
    color: var(--ink);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.mode-chip em {
    font-style: normal;
    font-weight: 500;
    font-size: .84rem;
    color: var(--text2);
}

.mode-chip:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: rgba(155, 92, 255, .4);
}

/* ---------- 覆盖领域 ---------- */
.domains { background: #fff; }

.domain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 22px;
}

.domain-card {
    background: linear-gradient(165deg, #FBFAFF 0%, #fff 70%);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px 26px;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.domain-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow);
    border-color: rgba(109, 94, 252, .35);
}

.domain-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 54px; height: 54px;
    border-radius: 15px;
    color: var(--brand);
    background: var(--brand-soft);
    margin-bottom: 18px;
}

.domain-card h3 { font-size: 1.14rem; margin-bottom: 8px; }
.domain-card p { color: var(--text2); font-size: .93rem; }

/* ---------- 联合会员 ---------- */
.membership { background: var(--paper); }

.membership-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
    border-radius: 24px;
    padding: 44px 42px;
    color: #fff;
    background: linear-gradient(140deg, #241456 0%, var(--brand) 62%, var(--brand2) 100%);
    box-shadow: var(--shadow);
}

.membership-card .eyebrow { color: #D9CFFF; }
.membership-card h2 { color: #fff; }

.membership-desc { color: rgba(255, 255, 255, .88); max-width: 560px; font-size: .98rem; }

.membership-btn {
    background: #fff;
    color: var(--brand);
    font-weight: 700;
    white-space: nowrap;
}

.membership-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0, 0, 0, .24); color: var(--brand); }

/* ---------- 上线预告 ---------- */
.launch {
    background: linear-gradient(180deg, #FFFFFF 0%, var(--brand-soft) 100%);
    text-align: center;
}

.launch-sub { margin-left: auto; margin-right: auto; }

.launch-btn {
    background: linear-gradient(120deg, var(--brand), var(--brand2));
    color: #fff;
    font-weight: 700;
}

.launch-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(109, 94, 252, .34); color: #fff; }

/* ---------- 页脚 ---------- */
footer { background: var(--ink); color: rgba(255, 255, 255, .8); padding: 46px 0 24px; }

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 26px;
}

.footer-logo { display: flex; align-items: center; gap: 10px; }
.footer-logo .logo-text { color: #fff; font-size: 1.15rem; font-weight: 700; }

.footer-links { display: flex; gap: 24px; }

.footer-links a { color: rgba(255, 255, 255, .72); font-size: .92rem; transition: color .2s ease; }
.footer-links a:hover { color: #fff; }

.copyright {
    text-align: center;
    color: rgba(255, 255, 255, .45);
    font-size: .85rem;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, .08);
}

.copyright a { color: rgba(255, 255, 255, .45); }
.copyright a:hover { color: #fff; }

/* ---------- 入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
    nav { display: none; }
    section { padding: 62px 0; }
    .hero { padding: 130px 0 72px; }
    .br-pc { display: none; }
    .membership-card { padding: 34px 26px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; transition: none; }
}