/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter','PingFang SC','Microsoft YaHei',sans-serif;color:#1a1a2e;background:#fafbff;line-height:1.6;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}

/* ===== CSS Variables ===== */
:root{
  --primary:#4f46e5;--primary-light:#818cf8;--primary-dark:#3730a3;
  --accent:#06b6d4;--accent-light:#67e8f9;
  --gradient:linear-gradient(135deg,#4f46e5 0%,#06b6d4 100%);
  --gradient-soft:linear-gradient(135deg,#eef2ff 0%,#ecfeff 100%);
  --text:#1e293b;--text-secondary:#64748b;--text-light:#94a3b8;
  --bg:#ffffff;--bg-alt:#f8fafc;--border:#e2e8f0;
  --shadow-sm:0 1px 3px rgba(0,0,0,.06);
  --shadow-md:0 4px 20px rgba(79,70,229,.1);
  --shadow-lg:0 10px 40px rgba(79,70,229,.15);
  --radius:16px;--radius-sm:10px;
  --max-w:1200px;
}

/* ===== Layout ===== */
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}
section{padding:100px 0}

/* ===== Navigation ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:16px 0;transition:all .3s}
.nav.scrolled{background:rgba(255,255,255,.92);backdrop-filter:blur(20px);box-shadow:var(--shadow-sm)}
.nav .container{display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.4rem;font-weight:800}
.nav-logo .logo-icon{width:36px;height:36px;background:var(--gradient);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem}
.nav-links{display:flex;gap:32px;align-items:center}
.nav-links a{font-size:.9rem;font-weight:500;color:var(--text-secondary);transition:color .2s}
.nav-links a:hover{color:var(--primary)}
.nav-cta{background:var(--gradient);color:#fff!important;padding:10px 24px;border-radius:50px;font-weight:600;transition:transform .2s,box-shadow .2s}
.nav-cta:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}

/* ===== Hero ===== */
.hero{padding:160px 0 100px;background:linear-gradient(180deg,#eef2ff 0%,#fafbff 100%);position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-200px;right:-200px;width:600px;height:600px;background:radial-gradient(circle,rgba(79,70,229,.08) 0%,transparent 70%);border-radius:50%}
.hero::after{content:'';position:absolute;bottom:-100px;left:-100px;width:400px;height:400px;background:radial-gradient(circle,rgba(6,182,212,.06) 0%,transparent 70%);border-radius:50%}
.hero .container{display:flex;align-items:center;gap:60px;position:relative;z-index:1}
.hero-content{flex:1}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;background:rgba(79,70,229,.08);border:1px solid rgba(79,70,229,.15);border-radius:50px;font-size:.8rem;color:var(--primary);font-weight:600;margin-bottom:24px}
.hero-badge .dot{width:6px;height:6px;background:var(--primary);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{font-size:3.2rem;font-weight:800;line-height:1.2;margin-bottom:20px;background:linear-gradient(135deg,var(--text) 0%,var(--primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:1.15rem;color:var(--text-secondary);max-width:520px;margin-bottom:36px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary{background:var(--gradient);color:#fff;padding:14px 32px;border-radius:50px;font-weight:700;font-size:1rem;border:none;cursor:pointer;transition:all .3s;box-shadow:0 4px 15px rgba(79,70,229,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 25px rgba(79,70,229,.4)}
.btn-outline{padding:14px 32px;border-radius:50px;font-weight:700;font-size:1rem;border:2px solid var(--border);color:var(--text);cursor:pointer;background:transparent;transition:all .3s}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.hero-visual{flex:1;position:relative}
.hero-mockup{background:var(--bg);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:24px;border:1px solid var(--border)}
.mockup-header{display:flex;gap:6px;margin-bottom:16px}
.mockup-header span{width:10px;height:10px;border-radius:50%;background:#e2e8f0}
.mockup-header span:first-child{background:#f87171}
.mockup-header span:nth-child(2){background:#fbbf24}
.mockup-header span:nth-child(3){background:#34d399}
.mockup-calendar{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.cal-head{font-size:.7rem;text-align:center;color:var(--text-light);padding:4px;font-weight:600}
.cal-cell{aspect-ratio:1;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;background:var(--bg-alt);color:var(--text-secondary);position:relative}
.cal-cell.shift-day{background:rgba(79,70,229,.1);color:var(--primary)}
.cal-cell.shift-night{background:rgba(6,182,212,.1);color:var(--accent)}
.cal-cell.shift-off{background:rgba(34,197,94,.1);color:#16a34a}
.hero-stats{display:flex;gap:24px;margin-top:20px}
.hero-stat{text-align:center;padding:12px 20px;background:rgba(255,255,255,.8);backdrop-filter:blur(10px);border-radius:var(--radius-sm);border:1px solid var(--border)}
.hero-stat .num{font-size:1.5rem;font-weight:800;color:var(--primary)}
.hero-stat .label{font-size:.75rem;color:var(--text-light)}

/* ===== Pain Points ===== */
.pain{background:var(--bg)}
.section-header{text-align:center;margin-bottom:64px}
.section-tag{display:inline-block;padding:6px 16px;background:rgba(79,70,229,.08);border-radius:50px;font-size:.8rem;color:var(--primary);font-weight:600;margin-bottom:16px}
.section-header h2{font-size:2.4rem;font-weight:800;margin-bottom:12px}
.section-header p{color:var(--text-secondary);font-size:1.05rem;max-width:600px;margin:0 auto}
.pain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.pain-card{padding:32px;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg);transition:all .3s;position:relative;overflow:hidden}
.pain-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient);opacity:0;transition:opacity .3s}
.pain-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.pain-card:hover::before{opacity:1}
.pain-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:20px}
.pain-card:nth-child(1) .pain-icon{background:rgba(239,68,68,.1)}
.pain-card:nth-child(2) .pain-icon{background:rgba(245,158,11,.1)}
.pain-card:nth-child(3) .pain-icon{background:rgba(168,85,247,.1)}
.pain-card h3{font-size:1.15rem;font-weight:700;margin-bottom:10px}
.pain-card p{color:var(--text-secondary);font-size:.9rem;line-height:1.7}

/* ===== Features ===== */
.features{background:var(--bg-alt)}
.features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.feature-card{padding:36px;border-radius:var(--radius);background:var(--bg);border:1px solid var(--border);transition:all .3s;display:flex;gap:20px}
.feature-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.feature-icon{width:56px;height:56px;min-width:56px;border-radius:14px;background:var(--gradient-soft);display:flex;align-items:center;justify-content:center;font-size:1.6rem}
.feature-card h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.feature-card p{color:var(--text-secondary);font-size:.88rem;line-height:1.7}
.feature-tag{display:inline-block;margin-top:10px;padding:3px 10px;border-radius:50px;font-size:.7rem;font-weight:600;background:rgba(79,70,229,.08);color:var(--primary)}

/* ===== How It Works ===== */
.how{background:var(--bg)}
.steps{display:flex;gap:32px;position:relative}
.steps::before{content:'';position:absolute;top:40px;left:60px;right:60px;height:2px;background:var(--gradient)}
.step{flex:1;text-align:center;position:relative}
.step-num{width:80px;height:80px;border-radius:50%;background:var(--gradient);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.8rem;font-weight:800;margin:0 auto 24px;position:relative;z-index:1;box-shadow:0 4px 15px rgba(79,70,229,.3)}
.step h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.step p{color:var(--text-secondary);font-size:.88rem;padding:0 12px}

/* ===== Tech Stack ===== */
.tech{background:var(--bg-alt)}
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.tech-card{padding:32px;border-radius:var(--radius);background:var(--bg);border:1px solid var(--border);text-align:center;transition:all .3s}
.tech-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.tech-card .tech-emoji{font-size:2.5rem;margin-bottom:16px}
.tech-card h3{font-size:1.05rem;font-weight:700;margin-bottom:6px}
.tech-card p{color:var(--text-secondary);font-size:.85rem}

/* ===== CTA ===== */
.cta{background:var(--gradient);color:#fff;text-align:center;padding:80px 0}
.cta h2{font-size:2.4rem;font-weight:800;margin-bottom:16px}
.cta p{font-size:1.1rem;opacity:.85;margin-bottom:36px;max-width:500px;margin-left:auto;margin-right:auto}
.btn-white{background:#fff;color:var(--primary);padding:16px 40px;border-radius:50px;font-weight:700;font-size:1.05rem;border:none;cursor:pointer;transition:all .3s;box-shadow:0 4px 15px rgba(0,0,0,.1)}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 6px 25px rgba(0,0,0,.15)}

/* ===== Footer ===== */
.footer{background:#0f172a;color:#94a3b8;padding:48px 0 32px;text-align:center;font-size:.85rem}
.footer-logo{font-size:1.3rem;font-weight:800;color:#fff;margin-bottom:8px}
.footer p{margin-bottom:4px}

/* ===== Responsive ===== */
@media(max-width:900px){
  .hero .container{flex-direction:column;text-align:center}
  .hero h1{font-size:2.2rem}
  .hero p{margin:0 auto 30px}
  .hero-actions{justify-content:center}
  .pain-grid,.features-grid,.tech-grid{grid-template-columns:1fr}
  .steps{flex-direction:column;align-items:center}
  .steps::before{display:none}
  .nav-links{display:none}
}
@media(max-width:600px){
  section{padding:60px 0}
  .hero{padding:120px 0 60px}
  .hero h1{font-size:1.8rem}
  .section-header h2{font-size:1.8rem}
}