/* StudyMate AI VIP — Frontend v2.0.0 */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

:root{--sm-font:'Plus Jakarta Sans',system-ui,sans-serif;--sm-mono:'Fira Code',monospace}

/* ── Wrapper ── */
.sm-vip-wrapper{max-width:860px;margin:0 auto;font-family:var(--sm-font)}

/* ── Hero ── */
.sm-hero{text-align:center;padding:56px 24px 40px;background:linear-gradient(160deg,#0f0c29,#1a1040,#0d0d1a);border-radius:24px 24px 0 0;position:relative;overflow:hidden}
.sm-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 60% 50% at 50% 0%,rgba(99,102,241,.18),transparent);pointer-events:none}
.sm-hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(99,102,241,.15);border:1px solid rgba(99,102,241,.3);color:#a5b4fc;font-size:12px;font-weight:600;padding:5px 14px;border-radius:20px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:20px}
.sm-hero-title{font-size:clamp(28px,5vw,44px);font-weight:800;color:#fff;margin:0 0 14px;line-height:1.15;letter-spacing:-.02em}
.sm-hero-grad{background:linear-gradient(135deg,#818cf8,#a78bfa,#c084fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.sm-hero-sub{color:rgba(255,255,255,.5);font-size:16px;margin:0 auto 32px;max-width:500px;line-height:1.6}
.sm-hero-stats{display:flex;align-items:center;justify-content:center;gap:0}
.sm-stat{padding:0 28px;text-align:center}
.sm-stat-n{display:block;font-size:26px;font-weight:800;color:#a5b4fc;line-height:1}
.sm-stat-l{display:block;font-size:12px;color:rgba(255,255,255,.4);margin-top:4px;text-transform:uppercase;letter-spacing:.06em}
.sm-stat-div{width:1px;height:40px;background:rgba(255,255,255,.1)}

/* ── Widget ── */
.sm-widget{background:#0d0d1a;border:1px solid rgba(99,102,241,.15);border-top:none;border-bottom:none;font-family:var(--sm-font);color:rgba(255,255,255,.88)}

/* Head */
.sm-head{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:#111128;border-bottom:1px solid rgba(255,255,255,.06)}
.sm-head-left{display:flex;align-items:center;gap:12px}
.sm-avatar-wrap{position:relative;width:38px;height:38px}
.sm-bot-av{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--pc,#6366f1),var(--ac,#8b5cf6));display:flex;align-items:center;justify-content:center;font-size:18px}
.sm-status-dot{position:absolute;bottom:1px;right:1px;width:9px;height:9px;border-radius:50%;background:#22c55e;border:2px solid #111128;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.sm-head-name{font-size:15px;font-weight:700;color:#fff}
.sm-head-sub{font-size:11px;color:rgba(255,255,255,.35);margin-top:1px}
.sm-clear-btn{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);color:rgba(255,255,255,.45);font-size:12px;font-family:var(--sm-font);padding:5px 12px;border-radius:8px;cursor:pointer;transition:all .2s}
.sm-clear-btn:hover{background:rgba(99,102,241,.15);border-color:rgba(99,102,241,.4);color:#a5b4fc}

/* Tabs */
.sm-tabs{display:flex;gap:5px;padding:10px 14px;background:#111128;border-bottom:1px solid rgba(255,255,255,.06);overflow-x:auto;scrollbar-width:none}
.sm-tabs::-webkit-scrollbar{display:none}
.sm-tab{display:flex;align-items:center;gap:5px;padding:6px 13px;border-radius:20px;border:1px solid rgba(255,255,255,.07);background:transparent;color:rgba(255,255,255,.38);font-size:12px;font-weight:500;font-family:var(--sm-font);cursor:pointer;white-space:nowrap;transition:all .2s}
.sm-tab:hover{border-color:rgba(99,102,241,.4);color:#a5b4fc;background:rgba(99,102,241,.08)}
.sm-tab.sm-active{background:rgba(99,102,241,.18)!important;border-color:rgba(99,102,241,.5)!important;color:#a5b4fc!important;font-weight:600}

/* Messages */
.sm-msgs{padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:16px;scroll-behavior:smooth}
.sm-msgs::-webkit-scrollbar{width:3px}
.sm-msgs::-webkit-scrollbar-thumb{background:rgba(255,255,255,.08);border-radius:2px}
.sm-msg{display:flex;align-items:flex-start;gap:10px;max-width:88%;animation:fadein .3s ease}
@keyframes fadein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.sm-bot{align-self:flex-start}
.sm-user{align-self:flex-end;flex-direction:row-reverse}
.sm-av{width:34px;height:34px;min-width:34px;border-radius:50%;background:linear-gradient(135deg,var(--pc,#6366f1),var(--ac,#8b5cf6));display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.sm-av-s{width:26px;height:26px;min-width:26px;font-size:13px}
.sm-bub{padding:12px 16px;border-radius:16px;font-size:14px;line-height:1.65;word-break:break-word}
.sm-bub-bot{background:rgba(99,102,241,.08);border:1px solid rgba(99,102,241,.14);color:rgba(255,255,255,.88);border-bottom-left-radius:4px}
.sm-bub-user{background:linear-gradient(135deg,rgba(99,102,241,.25),rgba(139,92,246,.18));border:1px solid rgba(99,102,241,.3);color:rgba(255,255,255,.95);border-bottom-right-radius:4px}
.sm-bub-err{background:rgba(239,68,68,.08);border-color:rgba(239,68,68,.2);color:#fca5a5}
.sm-bub strong,.sm-bub b{color:#c7d2fe}
.sm-bub code{background:rgba(99,102,241,.15);padding:2px 6px;border-radius:4px;font-family:var(--sm-mono);font-size:12px;color:#a5b4fc}
.sm-bub pre{background:rgba(0,0,0,.4);border:1px solid rgba(99,102,241,.15);border-radius:10px;padding:12px 14px;margin-top:8px;overflow-x:auto;font-family:var(--sm-mono);font-size:12px}
.sm-bub ul,.sm-bub ol{padding-left:20px;margin:6px 0}
.sm-bub li{margin:4px 0}

/* Typing */
.sm-typing{display:flex;align-items:center;gap:10px;padding:0 20px 12px}
.sm-dots{display:flex;gap:4px;align-items:center;padding:10px 14px;background:rgba(99,102,241,.07);border:1px solid rgba(99,102,241,.12);border-radius:16px;border-bottom-left-radius:4px}
.sm-dots span{width:6px;height:6px;border-radius:50%;background:rgba(99,102,241,.7);animation:dot 1.2s ease-in-out infinite}
.sm-dots span:nth-child(2){animation-delay:.2s}
.sm-dots span:nth-child(3){animation-delay:.4s}
@keyframes dot{0%,60%,100%{opacity:.2;transform:scale(1)}30%{opacity:1;transform:scale(1.3)}}

/* Input */
.sm-input-row{padding:12px 14px;border-top:1px solid rgba(255,255,255,.06);background:#111128}
.sm-input-pill{display:flex;align-items:center;background:#1c1c35;border:1.5px solid rgba(99,102,241,.3);border-radius:14px;overflow:hidden;transition:border-color .2s,box-shadow .2s}
.sm-input-pill:focus-within{border-color:rgba(99,102,241,.7);box-shadow:0 0 0 3px rgba(99,102,241,.12)}
.sm-input-icon{padding:0 13px;color:rgba(255,255,255,.25);display:flex;align-items:center;flex-shrink:0}
.sm-input{flex:1;background:transparent!important;border:none!important;outline:none!important;color:#ffffff!important;font-size:14px!important;font-family:var(--sm-font);padding:13px 0!important;resize:none;line-height:1.5;-webkit-text-fill-color:#ffffff!important;caret-color:#a5b4fc!important;min-height:unset;max-height:120px}
.sm-input::placeholder{color:rgba(255,255,255,.28)!important}
.sm-send{display:flex;align-items:center;justify-content:center;width:46px;height:46px;min-width:46px;background:linear-gradient(135deg,var(--pc,#6366f1),var(--ac,#8b5cf6));border:none;cursor:pointer;border-radius:10px;margin:4px;flex-shrink:0;transition:opacity .15s,transform .1s;color:#fff}
.sm-send:hover{opacity:.88}
.sm-send:active{transform:scale(.95)}
.sm-send:disabled{opacity:.35;cursor:not-allowed}
.sm-foot{text-align:center;padding:8px;font-size:11px;color:rgba(255,255,255,.22);border-top:1px solid rgba(255,255,255,.05);background:#0d0d1a}

/* ── ARTICLE ── */
.sm-article{background:#fff;border:1px solid #e8eaf0;border-top:none;border-radius:0 0 24px 24px;overflow:hidden}

.sm-article-hero{background:linear-gradient(135deg,#1e1b4b,#312e81);padding:48px 40px;text-align:center}
.sm-article-tag{display:inline-block;background:rgba(165,180,252,.15);border:1px solid rgba(165,180,252,.3);color:#a5b4fc;font-size:11px;font-weight:700;padding:4px 14px;border-radius:20px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px}
.sm-article-hero h2{font-size:clamp(22px,4vw,34px);font-weight:800;color:#fff;margin:0 0 12px;letter-spacing:-.02em}
.sm-article-hero p{color:rgba(255,255,255,.55);font-size:15px;max-width:520px;margin:0 auto;line-height:1.65}

.sm-article-body{padding:48px 40px}

.sm-section-block{margin-bottom:40px}
.sm-section-block h3{font-size:22px;font-weight:700;color:#1e1b4b;margin:0 0 16px;padding-bottom:10px;border-bottom:2px solid #e0e7ff}
.sm-section-block p{font-size:15px;color:#374151;line-height:1.8;margin:0 0 14px}
.sm-section-block p:last-child{margin-bottom:0}
.sm-section-block strong{color:#1e1b4b}

.sm-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:20px;margin:40px 0}
.sm-feat{display:flex;gap:16px;padding:22px;background:#fafbff;border:1px solid #e8eaf0;border-radius:14px;border-left:3px solid #6366f1;transition:transform .2s,box-shadow .2s}
.sm-feat:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(99,102,241,.1)}
.sm-feat-icon{font-size:26px;flex-shrink:0;width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:#ede9fe;border-radius:10px}
.sm-feat-content h4{font-size:15px;font-weight:700;color:#1e1b4b;margin:0 0 6px}
.sm-feat-content p{font-size:13px;color:#6b7280;line-height:1.65;margin:0}
.sm-feat-content strong{color:#4338ca}

.sm-code-block{background:#1e1b4b;border-radius:10px;padding:12px 18px;margin:10px 0;font-family:var(--sm-mono,'Fira Code',monospace)}
.sm-code-block code{color:#a5b4fc;font-size:13px;background:none;padding:0}

.sm-conclusion{background:linear-gradient(135deg,#1e1b4b,#312e81);border-radius:16px;padding:40px;text-align:center;margin-top:40px}
.sm-conclusion-icon{font-size:40px;margin-bottom:16px}
.sm-conclusion h3{font-size:24px;font-weight:800;color:#fff;margin:0 0 16px}
.sm-conclusion p{font-size:15px;color:rgba(255,255,255,.65);max-width:580px;margin:0 auto 14px;line-height:1.75}
.sm-quote{font-size:18px;font-weight:700;color:#a5b4fc;margin-top:24px;font-style:italic}

/* Responsive */
@media(max-width:600px){.sm-hero{padding:36px 16px 28px;border-radius:16px 16px 0 0}.sm-hero-title{font-size:26px}.sm-stat{padding:0 16px}.sm-article-hero{padding:32px 20px}.sm-article-body{padding:28px 20px}.sm-features-grid{grid-template-columns:1fr}.sm-feat{flex-direction:column}.sm-article{border-radius:0 0 16px 16px}.sm-bub{font-size:13px}.sm-msg{max-width:95%}}