:root{
  --bg:#fafafa;--surface:#ffffff;--ink:#171717;--muted:#707070;--line:#e9e9e7;
  --accent:#e8503a;--accent-ink:#fff;--radius:16px;--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.05);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:"DM Sans","Noto Sans SC",system-ui,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.muted{color:var(--muted)}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

/* NAV */
.nav{position:sticky;top:0;z-index:50;background:rgba(250,250,250,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1120px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.brand-logo{height:28px;width:auto}
.nav-links{display:flex;align-items:center;gap:28px;font-size:15px}
.nav-links a:not(.btn):hover{color:var(--accent)}
.nav-toggle{display:none;background:none;border:0;font-size:22px;cursor:pointer}

/* BUTTONS */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--ink);color:#fff;border:1px solid var(--ink);padding:12px 26px;border-radius:999px;font-size:15px;font-weight:500;cursor:pointer;transition:.2s;font-family:inherit}
.btn:hover{background:#000;transform:translateY(-1px)}
.btn-sm{padding:8px 18px;font-size:14px}
.btn-accent{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-accent:hover{background:#d1402b}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--ink);background:transparent}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}

/* HERO */
.hero{padding:96px 0 72px;text-align:center}
.hero h1{font-size:clamp(36px,6vw,64px);line-height:1.12;font-weight:700;letter-spacing:-.03em}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{max-width:560px;margin:20px auto 34px;color:var(--muted);font-size:18px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* SECTIONS */
.section{padding:72px 0}
.section-head{text-align:center;margin-bottom:48px}
.section-head h2{font-size:clamp(26px,4vw,38px);letter-spacing:-.02em;font-weight:700}
.section-head p{color:var(--muted);margin-top:10px}

/* CARDS */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);transition:.2s}
.card:hover{transform:translateY(-3px)}
.card h3{font-size:19px;margin-bottom:10px;font-weight:600}
.card p{color:var(--muted);font-size:15px}
.icon-badge{width:44px;height:44px;border-radius:12px;background:#fdf0ee;color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:18px}

/* STATS */
.stats{display:flex;justify-content:center;gap:72px;flex-wrap:wrap;padding:56px 0}
.stat{text-align:center}
.stat b{font-size:36px;letter-spacing:-.02em;display:block}
.stat span{color:var(--muted);font-size:14px}

/* PLAN PRICING */
.plan{position:relative;text-align:left}
.plan-badge{position:absolute;top:-12px;right:22px;background:var(--accent);color:#fff;font-size:12px;padding:4px 12px;border-radius:999px}
.plan h3{font-size:20px}
.plan-price{font-size:40px;font-weight:700;letter-spacing:-.03em;margin:14px 0 4px}
.plan-price small{font-size:15px;color:var(--muted);font-weight:400}
.plan-desc{color:var(--muted);font-size:14px;margin-bottom:22px;min-height:44px}
.plan-featured{border-color:var(--ink);box-shadow:0 0 0 1px var(--ink),var(--shadow)}

/* ARTICLES */
.article-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.article-cover{aspect-ratio:16/9;background:#eee;overflow:hidden}
.article-cover img{width:100%;height:100%;object-fit:cover;transition:.4s}
.article-card:hover .article-cover img{transform:scale(1.04)}
.article-body{padding:22px 24px 26px;display:flex;flex-direction:column;gap:10px;flex:1}
.article-body h3{font-size:18px;line-height:1.4}
.article-body p{color:var(--muted);font-size:14px;flex:1}
.article-meta{display:flex;gap:14px;font-size:13px;color:var(--muted)}
.tag{display:inline-block;background:#f3f3f1;border-radius:6px;padding:2px 10px;font-size:12px;color:var(--muted)}

/* ARTICLE CONTENT */
.article-hero{max-width:760px;margin:0 auto;padding:64px 24px 24px}
.article-hero h1{font-size:clamp(28px,4vw,42px);line-height:1.25;letter-spacing:-.02em}
.article-content{max-width:760px;margin:0 auto;padding:12px 24px 80px;font-size:17px}
.article-content h2{margin:36px 0 14px;font-size:24px;letter-spacing:-.01em}
.article-content p{margin-bottom:14px;color:#333}
.article-content img{border-radius:12px;margin:18px 0}

/* FORMS */
.form-card{max-width:440px;margin:56px auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow)}
.form-card h1{font-size:26px;letter-spacing:-.02em;margin-bottom:6px}
.form-card .sub{color:var(--muted);font-size:14px;margin-bottom:26px}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;font-weight:500;margin-bottom:6px}
.input,textarea.input,select.input{width:100%;padding:12px 16px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;background:#fff;transition:.15s;color:var(--ink)}
.input:focus{outline:none;border-color:var(--ink)}
textarea.input{resize:vertical}
.form-error{background:#fdf0ee;color:var(--accent);border-radius:10px;padding:10px 14px;font-size:14px;margin-bottom:16px}
.form-ok{background:#eefaf1;color:#1c7c3f;border-radius:10px;padding:10px 14px;font-size:14px;margin-bottom:16px}

/* TOOL PAGES */
.tool-wrap{max-width:1120px;margin:0 auto;padding:48px 24px 80px;display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start}
@media(max-width:900px){.tool-wrap{grid-template-columns:1fr}}
.tool-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.tool-panel h1{font-size:26px;letter-spacing:-.02em;margin-bottom:4px}
.tool-panel .sub{color:var(--muted);font-size:14px;margin-bottom:22px}
.drop{border:2px dashed var(--line);border-radius:12px;padding:26px;text-align:center;color:var(--muted);cursor:pointer;transition:.15s;font-size:14px}
.drop:hover,.drop.has{border-color:var(--ink);color:var(--ink)}
.drop img{max-height:180px;border-radius:8px;margin-top:10px}
.cost-note{font-size:13px;color:var(--muted);margin-top:12px}
.result-box{margin-top:8px}
.result-box img{border-radius:12px;border:1px solid var(--line)}
.chat-log{max-height:480px;overflow-y:auto;display:flex;flex-direction:column;gap:14px;margin-bottom:16px}
.msg{max-width:88%;padding:12px 16px;border-radius:14px;font-size:15px;white-space:pre-wrap;line-height:1.7}
.msg.user{align-self:flex-end;background:var(--ink);color:#fff;border-bottom-right-radius:4px}
.msg.ai{align-self:flex-start;background:#f3f3f1;border-bottom-left-radius:4px}
.msg.ai img{border-radius:10px;margin-top:8px;max-height:320px}
.msg.typing{color:var(--muted)}

/* USER CENTER */
.uc-wrap{max-width:1120px;margin:0 auto;padding:40px 24px 80px;display:grid;grid-template-columns:230px 1fr;gap:28px;align-items:start}
@media(max-width:820px){.uc-wrap{grid-template-columns:1fr}}
.uc-nav{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);position:sticky;top:84px}
.uc-nav a{display:block;padding:10px 14px;border-radius:10px;font-size:14px;color:var(--muted)}
.uc-nav a.active,.uc-nav a:hover{background:#f3f3f1;color:var(--ink)}
.uc-main{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);min-height:400px}
.uc-main h2{font-size:20px;margin-bottom:20px;letter-spacing:-.01em}
.credit-card{background:linear-gradient(135deg,#171717,#3a3a3a);color:#fff;border-radius:var(--radius);padding:26px;margin-bottom:24px}
.credit-card b{font-size:34px;letter-spacing:-.02em}
.credit-card span{display:block;opacity:.7;font-size:13px;margin-top:2px}

/* TABLE */
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);color:var(--muted);font-weight:500;font-size:13px}
.table td{padding:12px;border-bottom:1px solid #f3f3f1;vertical-align:middle}
.table tr:last-child td{border-bottom:none}
.thumb{width:48px;height:48px;object-fit:cover;border-radius:8px}
.status-pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px}
.status-ok,.status-paid,.status-active{background:#eefaf1;color:#1c7c3f}
.status-pending{background:#fdf6e8;color:#a06a00}
.status-fail,.status-cancelled,.status-banned{background:#fdf0ee;color:var(--accent)}

/* ADMIN */
.admin-wrap{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.admin-side{background:#171717;color:#fff;padding:20px 14px;position:sticky;top:0;height:100vh}
.admin-side .brand{color:#fff;padding:6px 10px 20px;display:block;font-weight:700}
.admin-side a{display:block;padding:10px 12px;border-radius:8px;font-size:14px;color:#bdbdbd;margin-bottom:2px}
.admin-side a.active,.admin-side a:hover{background:#2a2a2a;color:#fff}
.admin-main{padding:32px 40px}
.admin-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}
.admin-top h1{font-size:24px;letter-spacing:-.01em}
.admin-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:32px}
.admin-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.admin-card b{font-size:28px;display:block;letter-spacing:-.02em}
.admin-card span{color:var(--muted);font-size:13px}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;margin-bottom:24px}
.panel h2{font-size:17px;margin-bottom:20px}
.panel-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 32px}
@media(max-width:760px){.panel-grid{grid-template-columns:1fr}}
.admin-login{max-width:400px;margin:10vh auto 0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow)}

/* ANNOUNCE + FOOTER */
.announce{background:var(--ink);color:#fff;text-align:center;font-size:13px;padding:8px 16px}
.footer{border-top:1px solid var(--line);padding:48px 0 32px;margin-top:40px;background:#fff}
.footer-inner{max-width:1120px;margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap}
.footer-brand{font-weight:700;margin-bottom:6px}
.footer-links{display:flex;gap:24px;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--ink)}
.icp{text-align:center;color:var(--muted);font-size:12px;margin-top:32px}

/* TOAST */
.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 24px;border-radius:999px;font-size:14px;opacity:0;transition:.25s;z-index:99;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media(max-width:820px){
  .nav-links{position:fixed;top:57px;right:0;left:0;background:#fff;flex-direction:column;align-items:stretch;padding:20px 24px;gap:14px;border-bottom:1px solid var(--line);display:none}
  .nav-open .nav-links{display:flex}
  .nav-toggle{display:block}
  .grid-3,.grid-2,.admin-cards{grid-template-columns:1fr}
  .admin-wrap{grid-template-columns:1fr}
  .admin-side{position:static;height:auto;display:flex;flex-wrap:wrap;gap:4px}
  .admin-main{padding:20px}
  .stats{gap:40px}
}