/* ========== 全局重置与变量 ========== */
* { margin:0; padding:0; box-sizing:border-box; font-family:'Segoe UI','PingFang SC','Microsoft YaHei',Arial,Helvetica,sans-serif; }
:root {
    /* 方案A：柔紫罗兰 */
    --primary:#7C5CBF;
    --primary-dark:#5B3E8E;
    --primary-light:#D4A0E8;
    --accent:#F2B8C6;
    --dark:#2D2438;
    --gray-800:#3D2C56;
    --gray-200:#E8E0F0;
    --gray-100:#F5F0FA;
    --white:#FFFFFF;
    --bg-soft:#FAF7FC;
    --radius:16px;
    --radius-lg:24px;
    --radius-full:50px;
    --shadow-sm:0 2px 12px rgba(124,92,191,.08);
    --shadow-md:0 12px 32px rgba(124,92,191,.12);
    --shadow-lg:0 20px 48px rgba(91,62,142,.18);
    --transition:all .3s cubic-bezier(.4,0,.2,1);
}
html { scroll-behavior:smooth; -webkit-font-smoothing:antialiased; }
body { line-height:1.7; color:var(--dark); background:var(--bg-soft); overflow-x:hidden; }
a { text-decoration:none; color:inherit; transition:var(--transition); }
button { cursor:pointer; border:none; background:none; font-family:inherit; }

/* ========== Logo 图片类 ========== */
.env-main-icon {
    background-image:url('../img/atumanman-icon-256.png');
    width:36px; height:36px; background-size:contain;
    background-repeat:no-repeat; background-position:center;
    display:inline-block; flex-shrink:0;
    border-radius:10px;  /* 如果图片是白底，形成圆角徽章 */
}
.env-main-icon.icon-large { width:72px; height:72px; border-radius:18px; }
.float-panel-bg {
    background-image:url('../img/float_panel_bg.png');
    background-size:cover; background-repeat:no-repeat; background-position:center;
}


/* ========== 导航栏 ========== */
header {
    position:fixed; width:100%; top:0; z-index:100;
    transition:background .35s,box-shadow .35s; background:transparent;
}
header.nav-scrolled {
    background:rgba(45,36,56,.92);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    box-shadow:0 4px 30px rgba(91,62,142,.15);
}
nav {
    max-width:1280px; margin:0 auto; padding:.9rem 2rem;
    display:flex; justify-content:space-between; align-items:center; gap:1rem;
}
.logo {
    font-size:1.3rem; font-weight:700; color:var(--white);
    display:flex; align-items:center; gap:.7rem; letter-spacing:.01em;
}
.logo .env-main-icon { width:34px; height:34px; }
nav ul { display:flex; gap:2.2rem; list-style:none; align-items:center; }
nav ul li a {
    color:rgba(255,255,255,.85); font-size:.95rem; font-weight:500;
    padding:.4rem 0; border-bottom:2px solid transparent;
    transition:var(--transition); letter-spacing:.02em;
}
nav ul li a:hover {
    color:var(--white);
    border-bottom-color:var(--primary-light);
}
.auth-buttons {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}
.btn-nav-login {
    color: rgba(255,255,255,0.9);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.3);
    transition: var(--transition);
}
.btn-nav-login:hover {
    background: rgba(255,255,255,0.12);
    color: var(--white);
}
.btn-nav-register {
    color: var(--primary);
    background: var(--white);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.5rem 1.4rem;
    border-radius: 50px;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}
.btn-nav-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(0,0,0,0.22);
}

/* ========== 浮动面板 ========== */
.float-panel-bg {
    position:fixed; bottom:100px; right:24px; width:260px; z-index:90;
    border-radius:var(--radius-lg); box-shadow:var(--shadow-lg);
    opacity:0; visibility:hidden; transform:translateY(20px);
    transition:opacity .35s,transform .35s,visibility .35s; overflow:hidden;
}
.float-panel-bg.open { opacity:1; visibility:visible; transform:translateY(0); }
.float-panel-inner {
    padding:1.5rem 1.2rem; display:flex; flex-direction:column; gap:.7rem;
    background:rgba(45,36,56,.92); backdrop-filter:blur(16px);
}
.float-panel-title { font-weight:600; color:var(--white); font-size:1rem; margin-bottom:.3rem; }
.float-link {
    color:rgba(255,255,255,.85); font-size:.9rem; padding:.55rem .9rem;
    border-radius:12px; background:rgba(255,255,255,.08);
    display:flex; align-items:center; gap:.5rem; transition:var(--transition);
}
.float-link:hover { background:rgba(255,255,255,.18); color:var(--white); }
.float-close {
    position:absolute; top:8px; right:10px; color:rgba(255,255,255,.7);
    font-size:1rem; width:30px; height:30px; border-radius:50%;
    display:flex; align-items:center; justify-content:center; transition:var(--transition);
}
.float-close:hover { background:rgba(255,255,255,.15); color:var(--white); }
.float-toggle {
    position:fixed; bottom:30px; right:24px; width:56px; height:56px;
    border-radius:50%; background:var(--primary); color:var(--white); font-size:1.5rem;
    display:flex; align-items:center; justify-content:center;
    box-shadow:var(--shadow-lg); z-index:95; transition:var(--transition);
}
.float-toggle:hover { background:var(--primary-dark); transform:scale(1.06); }

/* ========== Hero 区域 ========== */
.hero {
    min-height:100vh; padding:160px 2rem 80px;
    background:linear-gradient(135deg,#5B3E8E 0%,#7C5CBF 40%,#B89BD9 100%);
    color:var(--white); display:grid; grid-template-columns:1fr 1fr;
    gap:4rem; align-items:center; position:relative; overflow:hidden;
}
.hero::before {
    content:''; position:absolute; top:-200px; right:-200px; width:700px; height:700px;
    border-radius:50%; background:rgba(242,184,198,.15); pointer-events:none;
}
.hero::after {
    content:''; position:absolute; bottom:-150px; left:-100px; width:500px; height:500px;
    border-radius:50%; background:rgba(255,255,255,.06); pointer-events:none;
}
.hero-content { position:relative; z-index:2; }
.hero-badge {
    display:inline-flex; align-items:center; gap:.6rem;
    background:rgba(255,255,255,.14); backdrop-filter:blur(10px);
    padding:.55rem 1.3rem; border-radius:50px; font-size:.85rem; font-weight:500;
    margin-bottom:1.8rem; border:1px solid rgba(255,255,255,.2);
    letter-spacing:.03em;
}
.hero-badge .env-main-icon { width:22px; height:22px; border-radius:6px; }
.hero h1 {
    font-size:3.2rem; line-height:1.15; font-weight:700;
    letter-spacing:-.015em; margin-bottom:1.5rem;
}
.hero p { font-size:1.15rem; opacity:.92; margin-bottom:2.2rem; max-width:540px; font-weight:400; }
.hero-actions { display:flex; gap:1rem; flex-wrap:wrap; margin-bottom:2.5rem; }
.btn {
    display:inline-flex; align-items:center; gap:.5rem;
    padding:.9rem 2.5rem; border-radius:50px; font-weight:500;
    font-size:1rem; transition:var(--transition); letter-spacing:.02em;
}
.btn-primary {
    background:var(--white); color:var(--primary);
    box-shadow:0 4px 20px rgba(0,0,0,.12);
}
.btn-primary:hover { transform:translateY(-3px); box-shadow:0 12px 36px rgba(0,0,0,.2); }
.btn-ghost {
    background:rgba(255,255,255,.14); color:var(--white);
    border:1px solid rgba(255,255,255,.35);
}
.btn-ghost:hover { background:rgba(255,255,255,.24); transform:translateY(-3px); }
.btn-large { padding:1.15rem 3rem; font-size:1.1rem; }
.hero-img { position:relative; z-index:2; display:flex; justify-content:center; align-items:center; }
.hero-img-placeholder {
    background:rgba(255,255,255,.1); backdrop-filter:blur(16px);
    border-radius:var(--radius-lg); padding:3rem 2rem; text-align:center;
    border:1px solid rgba(255,255,255,.2); width:100%; max-width:420px;
    display:flex; flex-direction:column; align-items:center; gap:1.2rem;
    box-shadow:var(--shadow-lg);
}
.hero-img-placeholder p { font-size:1.1rem; font-weight:500; opacity:.9; }

/* ========== 滚动入场动画 ========== */
.fade-in { opacity:0; transform:translateY(30px); transition:opacity .7s,transform .7s; }
.fade-in.visible { opacity:1; transform:translateY(0); }