@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,300;0,14..32,400;0,14..32,500;0,14..32,600;0,14..32,700;0,14..32,800;0,14..32,900;1,14..32,400&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:         #1B262C;
  --bg-2:       #172025;
  --s1:         #21313C;
  --s2:         #283b48;
  --s3:         #304655;
  --border:     rgba(187,225,250,0.1);
  --ba:         rgba(255,211,105,0.2);
  --accent:     #FFD369;
  --accent-l:   #FFE08C;
  --accent-d:   #CCAA54;
  --glow:       rgba(255,211,105,0.15);
  --glow-s:     rgba(255,211,105,0.30);
  --t1:         #BBE1FA;
  --t2:         #8AA8BC;
  --t3:         #5c7280;
  --grad:       linear-gradient(135deg,#FFD369,#FFE08C);
  --r:          10px;
  --rl:         18px;
  --nav:        64px;
  --ease:       cubic-bezier(.4,0,.2,1);
}

/* ── Reset ──────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--t1);line-height:1.6;overflow-x:hidden}
button{cursor:pointer;border:none;background:none;font:inherit}
input,select,textarea{font:inherit}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::-webkit-scrollbar{width:5px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--s3);border-radius:99px}
::-webkit-scrollbar-thumb:hover{background:var(--accent)}

/* ── Nav ────────────────────────────────────────────────────── */
.nav{position:fixed;top:0;left:0;right:0;height:var(--nav);z-index:200;display:flex;align-items:center;justify-content:center;padding:0 48px;background:rgba(27,38,44,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border);transition:border-color .3s}
.nav-logo{display:flex;align-items:center;gap:10px;position:absolute;left:48px}
.nav-mark{width:32px;height:32px;background:var(--grad);border-radius:7px;display:grid;place-items:center;font-size:13px;font-weight:900;color:#1B262C;box-shadow:0 0 16px var(--glow)}
.nav-title{font-size:15px;font-weight:700;letter-spacing:-.03em}
.nav-title span{color:var(--accent)}
.nav-links{display:flex;gap:4px}
.nav-btn{padding:7px 16px;border-radius:99px;font-size:13.5px;font-weight:500;color:var(--t2);transition:all .2s var(--ease);position:relative}
.nav-btn:hover{color:var(--t1);background:var(--s2)}
.nav-btn.active{color:var(--t1);background:var(--s2)}
.nav-btn.active::after{content:'';position:absolute;bottom:5px;left:50%;transform:translateX(-50%);width:3px;height:3px;background:var(--accent);border-radius:99px}

/* ── Page system ────────────────────────────────────────────── */
.page-wrap{padding-top:var(--nav)}
.page{display:none;min-height:calc(100vh - var(--nav))}
.page.active{display:block}

/* ── Utility ────────────────────────────────────────────────── */
.container{max-width:1180px;margin:0 auto;padding:0 32px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border-radius:99px;font-size:14px;font-weight:600;transition:all .2s var(--ease)}
.btn-primary{background:var(--grad);color:#1B262C;box-shadow:0 4px 20px var(--glow)}
.btn-primary:hover{box-shadow:0 6px 28px var(--glow-s);transform:translateY(-1px)}
.btn-ghost{background:var(--s2);color:var(--t1);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--ba);background:var(--s3)}
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:99px;font-size:12px;font-weight:600;background:rgba(255,106,0,.1);color:var(--accent);border:1px solid var(--ba);letter-spacing:.04em;text-transform:uppercase}
.section-label{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.section-title{font-size:clamp(28px,4vw,46px);font-weight:800;letter-spacing:-.03em;line-height:1.15}
.gradient-text{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;color:var(--accent)}
.card{background:var(--s1);border:1px solid var(--border);border-radius:var(--rl);padding:28px;transition:all .3s var(--ease)}
.card:hover{border-color:var(--ba);box-shadow:0 8px 32px rgba(0,0,0,.5),0 0 0 1px var(--ba)}

/* ── Reveal animations ──────────────────────────────────────── */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.visible{opacity:1;transform:none}
.reveal-delay-1{transition-delay:.1s}
.reveal-delay-2{transition-delay:.2s}
.reveal-delay-3{transition-delay:.3s}
.reveal-delay-4{transition-delay:.4s}

/* ═══════════════════════════════════════════════════════════
   HOME PAGE
══════════════════════════════════════════════════════════ */
.hero{position:relative;min-height:calc(100vh - var(--nav));display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;overflow:hidden;padding:64px 32px}
#hero-canvas{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-glow{position:absolute;top:40%;left:50%;transform:translate(-50%,-50%);width:700px;height:700px;background:radial-gradient(circle,rgba(255,106,0,.07) 0%,transparent 65%);pointer-events:none;animation:pulse 5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.6;transform:translate(-50%,-50%) scale(1)}50%{opacity:1;transform:translate(-50%,-50%) scale(1.08)}}
.hero-content{position:relative;z-index:1;max-width:800px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;background:rgba(255,106,0,.08);border:1px solid var(--ba);border-radius:99px;font-size:12px;font-weight:600;color:var(--accent);letter-spacing:.06em;text-transform:uppercase;margin-bottom:28px;animation:fade-in .8s var(--ease) both}
.hero-h1{font-size:clamp(42px,7vw,88px);font-weight:900;letter-spacing:-.04em;line-height:1.05;margin-bottom:24px;animation:fade-up .9s var(--ease) .1s both}
.hero-sub{font-size:clamp(16px,2vw,20px);color:var(--t2);max-width:560px;margin:0 auto 40px;animation:fade-up .9s var(--ease) .2s both;line-height:1.7}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;animation:fade-up .9s var(--ease) .3s both}
@keyframes fade-in{from{opacity:0}to{opacity:1}}
@keyframes fade-up{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}

.stats-bar{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--s1);padding:20px 32px}
.stats-inner{max-width:1180px;margin:0 auto;display:flex;align-items:center;justify-content:center;gap:0}
.stat-item{display:flex;flex-direction:column;align-items:center;padding:0 40px;text-align:center;flex:1}
.stat-item+.stat-item{border-left:1px solid var(--border)}
.stat-num{font-size:32px;font-weight:900;letter-spacing:-.04em;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-label{font-size:12px;color:var(--t2);font-weight:500;margin-top:2px;letter-spacing:.02em}

.features{padding:96px 32px}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:56px}
.feat-card{background:var(--s1);border:1px solid var(--border);border-radius:var(--rl);padding:32px;transition:all .3s var(--ease);position:relative;overflow:hidden;transform-style:preserve-3d}
.feat-card::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 30% 20%,var(--glow),transparent 60%);opacity:0;transition:opacity .3s}
.feat-card:hover{border-color:var(--ba);transform:translateY(-4px);box-shadow:0 20px 40px rgba(0,0,0,.5)}
.feat-card:hover::before{opacity:1}
.feat-icon{width:48px;height:48px;background:rgba(255,106,0,.1);border:1px solid var(--ba);border-radius:12px;display:grid;place-items:center;font-size:22px;margin-bottom:20px}
.feat-title{font-size:18px;font-weight:700;letter-spacing:-.02em;margin-bottom:10px}
.feat-desc{font-size:14px;color:var(--t2);line-height:1.7}

.how-section{padding:0 32px 96px}
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-top:52px}
.how-step{display:flex;flex-direction:column;gap:16px}
.step-num{font-size:11px;font-weight:700;letter-spacing:.1em;color:var(--accent);text-transform:uppercase}
.step-title{font-size:16px;font-weight:700;letter-spacing:-.02em}
.step-desc{font-size:14px;color:var(--t2);line-height:1.7}

/* ═══════════════════════════════════════════════════════════
   EXPLORER PAGE
══════════════════════════════════════════════════════════ */
.explorer{padding:40px 32px 80px}
.explorer-header{margin-bottom:32px}
.explorer-header h2{font-size:clamp(24px,3vw,36px);font-weight:800;letter-spacing:-.03em;margin-bottom:8px}
.explorer-header p{color:var(--t2);font-size:15px}

.filter-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:40px;padding:20px 24px;background:var(--s1);border:1px solid var(--border);border-radius:var(--rl)}
.filter-group{display:flex;flex-direction:column;gap:6px;flex:1;min-width:180px}
.filter-label{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--t2)}
.filter-select{appearance:none;background:var(--s2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239a9a9a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 12px center;border:1px solid var(--border);border-radius:var(--r);padding:10px 36px 10px 14px;color:var(--t1);font-size:14px;cursor:pointer;transition:border-color .2s}
.filter-select:focus{outline:none;border-color:var(--accent)}
.filter-select option{background:var(--s2)}
.filter-divider{width:1px;height:40px;background:var(--border);flex-shrink:0}
.add-compare-btn{display:flex;align-items:center;gap:8px;padding:10px 20px;border-radius:99px;font-size:14px;font-weight:600;background:var(--s2);color:var(--t2);border:1px solid var(--border);transition:all .2s;white-space:nowrap}
.add-compare-btn:hover:not(:disabled){color:var(--t1);border-color:var(--ba);background:rgba(255,106,0,.08)}
.add-compare-btn:disabled{opacity:.4;cursor:not-allowed}

.topics-state{text-align:center;padding:80px 20px;color:var(--t2)}
.topics-state .state-icon{font-size:40px;margin-bottom:16px;opacity:.4}
.topics-state p{font-size:15px}

.topics-grid{display:grid;gap:12px}
.topic-chip{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;background:var(--s1);border:1px solid var(--border);border-radius:var(--r);cursor:pointer;transition:all .25s var(--ease);text-align:left}
.topic-chip:hover{border-color:var(--accent);background:rgba(255,106,0,.06);transform:translateX(4px)}
.topic-chip-name{font-size:16px;font-weight:700;letter-spacing:-.01em}
.topic-chip-count{font-size:12px;color:var(--t2);white-space:nowrap}
.topic-chip-arrow{font-size:16px;color:var(--accent);opacity:0;transition:opacity .2s,transform .2s}
.topic-chip:hover .topic-chip-arrow{opacity:1;transform:translateX(4px)}

.topic-group{margin-bottom:24px}
.topic-group-header{margin-bottom:12px;padding-left:4px}
.topic-questions{display:flex;flex-direction:column;gap:8px}
.question-summary-btn{text-align:left;background:var(--s2);border:1px solid var(--border);padding:14px 18px;border-radius:var(--r);font-size:14px;transition:all 0.2s var(--ease);color:#ffffff !important;cursor:pointer;line-height:1.5}
.question-summary-btn:hover{background:var(--s3);border-color:var(--accent);transform:translateX(4px)}
.question-summary-btn strong{color:var(--accent)}

.explorer, .explorer * { color: #ffffff !important; }
.explorer select.filter-select { color: #ffffff !important; background-color: var(--s2) !important; }
.explorer select.filter-select option { color: #ffffff !important; background-color: var(--s2) !important; }

/* Comparison */
.compare-tray{margin-top:40px;display:none}
.compare-tray.visible{display:block}
.compare-tray-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.compare-tray-title{font-size:16px;font-weight:700;letter-spacing:-.02em}
.compare-tray-actions{display:flex;gap:10px}
.compare-grid{display:grid;gap:16px}
.compare-panel{background:var(--s1);border:1px solid var(--border);border-radius:var(--rl);overflow:hidden}
.compare-panel-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--s2);border-bottom:1px solid var(--border)}
.compare-panel-title{font-size:14px;font-weight:700}
.compare-panel-sub{font-size:12px;color:var(--t2)}
.compare-panel-remove{font-size:18px;color:var(--t3);cursor:pointer;transition:color .2s;line-height:1}
.compare-panel-remove:hover{color:var(--accent)}
.compare-panel-body{padding:16px 20px;display:flex;flex-direction:column;gap:8px}
.compare-chip{padding:8px 14px;background:var(--s3);border:1px solid var(--border);border-radius:7px;font-size:13px;font-weight:500;cursor:pointer;transition:all .2s}
.compare-chip:hover{border-color:var(--accent);color:var(--accent)}
.compare-q-count{font-size:11px;color:var(--t2);margin-left:auto}

/* ═══════════════════════════════════════════════════════════
   CHAT PAGE
══════════════════════════════════════════════════════════ */
.chat-page{display:flex;height:calc(100vh - var(--nav));overflow:hidden}
.chat-main{flex:1;display:flex;flex-direction:column;overflow:hidden}
.chat-top-bar{padding:20px 32px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-shrink:0}
.chat-top-bar h2{font-size:18px;font-weight:700;letter-spacing:-.02em}
.chat-status{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--t2)}
.status-dot{width:7px;height:7px;border-radius:99px;background:#22c55e;box-shadow:0 0 8px rgba(34,197,94,.5)}
.status-dot.loading{background:var(--accent);animation:blink 1s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}

.prompts-strip{padding:12px 32px;border-bottom:1px solid var(--border);display:flex;gap:10px;overflow-x:auto;flex-shrink:0}
.prompts-strip::-webkit-scrollbar{height:0}
.prompt-chip{display:flex;align-items:center;gap:6px;padding:7px 14px;background:var(--s1);border:1px solid var(--border);border-radius:99px;font-size:13px;font-weight:500;color:var(--t2);white-space:nowrap;cursor:pointer;transition:all .2s;flex-shrink:0}
.prompt-chip:hover{color:var(--t1);border-color:var(--ba);background:rgba(255,106,0,.06)}

.chat-messages{flex:1;overflow-y:auto;padding:32px}
.chat-messages::-webkit-scrollbar{width:4px}
.chat-messages::-webkit-scrollbar-thumb{background:var(--s3);border-radius:99px}
.msg-group{display:flex;flex-direction:column;gap:6px;margin-bottom:28px;max-width:780px;margin-left:auto;margin-right:auto;width:100%}
.msg{padding:16px 20px;border-radius:16px;font-size:15px;line-height:1.75}
.msg-user{background:var(--accent);color:#1B262C;align-self:flex-end;border-bottom-right-radius:4px;max-width:75%}
.msg-ai{background:var(--s1);border:1px solid var(--border);align-self:flex-start;border-bottom-left-radius:4px;max-width:85%}
.msg-ai p{margin-bottom:10px}.msg-ai p:last-child{margin-bottom:0}
.msg-ai ul,.msg-ai ol{padding-left:20px;margin:8px 0}
.msg-ai li{margin-bottom:4px}
.msg-ai strong{color:var(--t1);font-weight:600}
.msg-ai code{background:var(--s3);padding:2px 6px;border-radius:4px;font-size:13px;font-family:monospace}

.sources-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;align-self:flex-start}
.source-tag{padding:4px 10px;background:var(--s2);border:1px solid var(--border);border-radius:6px;font-size:12px;color:var(--t2);display:inline-flex;align-items:center;gap:5px}
.source-tag strong{color:var(--accent);font-weight:600}

.citation-btn{color:var(--accent);font-weight:700;vertical-align:super;font-size:.8em;background:rgba(255,211,105,.15);border:1px solid var(--accent);border-radius:4px;padding:0 4px;margin:0 2px;cursor:pointer;transition:all .2s}
.citation-btn:hover{background:var(--accent);color:#1B262C}

.typing-indicator{display:flex;align-items:center;gap:6px;padding:16px 20px;background:var(--s1);border:1px solid var(--border);border-radius:16px;border-bottom-left-radius:4px;align-self:flex-start}
.typing-dot{width:6px;height:6px;border-radius:99px;background:var(--accent);animation:typing-bounce .9s infinite}
.typing-dot:nth-child(2){animation-delay:.15s}
.typing-dot:nth-child(3){animation-delay:.3s}
@keyframes typing-bounce{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-6px)}}

.chat-input-area{padding:20px 32px;border-top:1px solid var(--border);flex-shrink:0}
.chat-input-wrap{max-width:780px;margin:0 auto;display:flex;gap:12px;align-items:flex-end;background:var(--s1);border:1px solid var(--border);border-radius:var(--rl);padding:12px 16px;transition:border-color .2s}
.chat-input-wrap:focus-within{border-color:var(--accent)}
.chat-input{flex:1;background:none;border:none;outline:none;color:var(--t1);font-size:15px;resize:none;max-height:120px;line-height:1.6;padding:4px 0}
.chat-input::placeholder{color:var(--t3)}
.chat-send{width:38px;height:38px;border-radius:99px;background:var(--grad);color:#1B262C;display:grid;place-items:center;font-size:16px;transition:all .2s;flex-shrink:0;box-shadow:0 2px 12px var(--glow)}
.chat-send:hover{box-shadow:0 4px 20px var(--glow-s);transform:scale(1.05)}
.chat-send:disabled{opacity:.4;transform:none;cursor:not-allowed}

.empty-chat{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px;color:var(--t2)}
.empty-chat-icon{font-size:48px;margin-bottom:20px;opacity:.3}
.empty-chat h3{font-size:22px;font-weight:700;color:var(--t1);margin-bottom:8px;letter-spacing:-.02em}
.empty-chat p{font-size:15px;max-width:400px}

/* ═══════════════════════════════════════════════════════════
   MODAL
══════════════════════════════════════════════════════════ */
.modal-overlay{position:fixed;inset:0;z-index:300;background:rgba(0,0,0,.8);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:grid;place-items:center;padding:24px;opacity:0;pointer-events:none;transition:opacity .25s}
.modal-overlay.open{opacity:1;pointer-events:all}
.modal{background:var(--s1);border:1px solid var(--border);border-radius:20px;width:100%;max-width:700px;max-height:80vh;display:flex;flex-direction:column;transform:scale(.96);transition:transform .25s var(--ease);overflow:hidden}
.modal-overlay.open .modal{transform:scale(1)}
.modal-head{padding:24px 28px;border-bottom:1px solid var(--border);display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-shrink:0}
.modal-head-info{display:flex;flex-direction:column;gap:6px}
.modal-title{font-size:20px;font-weight:800;letter-spacing:-.03em}
.modal-meta{display:flex;gap:8px}
.modal-meta-tag{padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600;background:rgba(255,106,0,.1);color:var(--accent);border:1px solid var(--ba)}
.modal-close{width:32px;height:32px;border-radius:99px;background:var(--s3);color:var(--t2);display:grid;place-items:center;font-size:18px;line-height:1;cursor:pointer;flex-shrink:0;transition:all .2s}
.modal-close:hover{background:var(--accent);color:#1B262C}
.modal-body{overflow-y:auto;padding:24px 28px;display:flex;flex-direction:column;gap:20px}
.modal-body::-webkit-scrollbar{width:4px}
.modal-body::-webkit-scrollbar-thumb{background:var(--s3)}
.q-card{background:var(--s2);border:1px solid var(--border);border-radius:var(--r);overflow:hidden;flex-shrink:0}
.q-card-head{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--s3);border-bottom:1px solid var(--border)}
.q-num-badge{padding:3px 10px;border-radius:99px;background:var(--grad);color:#1B262C;font-size:11px;font-weight:700;letter-spacing:.04em}
.q-card-body{padding:16px;font-size:14px;color:var(--t1);line-height:1.8;white-space:pre-wrap}

/* ── Toast ──────────────────────────────────────────────────── */
.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%) translateY(80px);background:var(--s1);border:1px solid var(--border);border-radius:99px;padding:10px 20px;font-size:14px;font-weight:500;color:var(--t1);z-index:400;transition:transform .3s var(--ease),opacity .3s;opacity:0;white-space:nowrap}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}
.toast.accent{border-color:var(--ba);color:var(--accent)}

/* ── Responsive ─────────────────────────────────────────────── */
@media(max-width:900px){
  .features-grid{grid-template-columns:1fr 1fr}
  .how-grid{grid-template-columns:1fr}
  .compare-grid{grid-template-columns:1fr!important}
  .nav{padding:0 20px}
  .container{padding:0 20px}
}
@media(max-width:640px){
  .features-grid{grid-template-columns:1fr}
  .stat-item{padding:0 20px}
  .stat-num{font-size:24px}
  .chat-page{flex-direction:column}
  .filter-row{flex-direction:column;align-items:stretch}
  .filter-divider{display:none}
}