/* ============================================================
   MENTORA — warm "study lamp at dusk" edtech identity
   Display: Newsreader (literary serif)  ·  Body: Spline Sans
   ============================================================ */
:root{
  --paper:#f6efe3;        /* warm parchment */
  --paper-2:#efe5d4;
  --card:#fffaf2;
  --ink:#23201c;          /* near-black warm */
  --ink-soft:#5d564c;
  --ink-mute:#8a8073;
  --line:#e4d8c4;
  --teal:#11423f;         /* deep ink-teal */
  --teal-2:#1c5a55;
  --amber:#e8743b;        /* glowing coral-amber accent */
  --amber-2:#f2a65a;
  --amber-soft:#fbe7d3;
  --gold:#caa24a;
  --ok:#3f7d52;
  --radius:20px;
  --radius-sm:13px;
  --shadow:0 18px 44px -22px rgba(35,32,28,.45);
  --shadow-soft:0 8px 24px -16px rgba(35,32,28,.4);
  --serif:"Newsreader",Georgia,serif;
  --sans:"Spline Sans",system-ui,sans-serif;
  --mono:"Spline Sans Mono",ui-monospace,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:
    radial-gradient(1200px 620px at 78% -8%, rgba(242,166,90,.28), transparent 60%),
    radial-gradient(900px 520px at -5% 12%, rgba(28,90,85,.12), transparent 55%),
    var(--paper);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* grain overlay */
.grain{position:fixed;inset:0;pointer-events:none;z-index:60;opacity:.05;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");}

a{color:inherit;text-decoration:none}
.muted{color:var(--ink-mute)}

/* ---------- back link ---------- */
.back-link{position:fixed;left:16px;bottom:16px;z-index:70;font-size:13px;font-weight:600;
  background:var(--teal);color:#f6efe3;padding:8px 14px;border-radius:999px;
  box-shadow:var(--shadow-soft);transition:transform .2s ease,background .2s ease}
.back-link:hover{transform:translateY(-2px);background:var(--teal-2)}

/* ---------- logo ---------- */
.logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;
  background:linear-gradient(150deg,var(--teal),var(--teal-2));position:relative;flex:none}
.logo--sm{width:22px;height:22px;border-radius:7px}
.logo__spark{width:11px;height:11px;border-radius:50% 50% 50% 0;transform:rotate(45deg);
  background:radial-gradient(circle at 30% 30%,#fff,var(--amber-2) 45%,var(--amber));
  box-shadow:0 0 12px rgba(242,166,90,.9)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;
  font-family:var(--sans);font-weight:600;font-size:14px;border:0;border-radius:999px;
  padding:11px 20px;transition:transform .18s ease,box-shadow .2s ease,background .2s ease,color .2s ease;
  white-space:nowrap}
.btn:active{transform:translateY(1px) scale(.99)}
.btn--solid{background:linear-gradient(150deg,var(--amber),var(--amber-2));color:#2a1808;
  box-shadow:0 12px 26px -12px rgba(232,116,59,.7)}
.btn--solid:hover{transform:translateY(-2px);box-shadow:0 18px 34px -14px rgba(232,116,59,.8)}
.btn--ghost{background:transparent;color:var(--teal);border:1.5px solid var(--line)}
.btn--ghost:hover{border-color:var(--teal);background:rgba(17,66,63,.05)}
.btn--lg{padding:14px 26px;font-size:15px}
.btn--sm{padding:7px 13px;font-size:12.5px}
.btn--block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}

/* ---------- screens ---------- */
[hidden]{display:none !important}
.screen{display:none;animation:fade .45s ease}
.screen.is-active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.app-wrap{max-width:1140px;margin:0 auto;padding:34px 26px 90px}

/* reveal */
.reveal{opacity:0;transform:translateY(16px);animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards;animation-delay:var(--d,0s)}
@keyframes rise{to{opacity:1;transform:none}}
.reveal-on-scroll{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal-on-scroll.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal,.reveal-on-scroll{animation:none!important;opacity:1!important;transform:none!important;transition:none}.lobby__pulse{animation:none}}

/* ============ APP BAR ============ */
.appbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:24px;
  padding:13px 26px;background:rgba(246,239,227,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line)}
.appbar__brand{display:flex;align-items:center;gap:9px;font-family:var(--serif);font-size:21px;font-weight:600}
.appbar__nav{display:flex;gap:6px;margin-left:8px}
.appbar__nav a{font-weight:600;font-size:14px;color:var(--ink-soft);padding:8px 14px;border-radius:999px;transition:.2s}
.appbar__nav a:hover{color:var(--ink);background:rgba(17,66,63,.06)}
.appbar__nav a.active{color:var(--teal);background:#fff;box-shadow:var(--shadow-soft)}
.appbar__right{margin-left:auto;display:flex;align-items:center;gap:14px}
.streak-chip{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--teal);
  background:var(--amber-soft);border:1px solid #f3d3b3;padding:6px 12px;border-radius:999px}
.streak-chip__flame{color:var(--amber)}
.avatar{display:inline-grid;place-items:center;border-radius:50%;font-weight:700;font-size:14px;
  width:38px;height:38px;color:#fff;background:linear-gradient(150deg,var(--a,#11423f),var(--b,#1c5a55));flex:none}
.avatar--me{background:linear-gradient(150deg,var(--teal),var(--teal-2));font-size:13px}
.avatar--lg{width:52px;height:52px;font-size:17px}

/* ============ LANDING ============ */
.landing-nav{max-width:1180px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:26px}
.brand{display:flex;align-items:center;gap:10px}
.brand-name{font-family:var(--serif);font-size:24px;font-weight:600;letter-spacing:-.01em}
.landing-nav__links{display:flex;align-items:center;gap:8px}
.landing-nav__links a{font-weight:600;font-size:14px;color:var(--ink-soft);padding:9px 14px;border-radius:999px;transition:.2s}
.landing-nav__links a:hover{color:var(--ink)}
.landing-nav__links .btn{color:#2a1808}

.hero{max-width:1180px;margin:0 auto;padding:30px 26px 40px;display:grid;
  grid-template-columns:1.15fr .85fr;gap:46px;align-items:center}
.hero__kicker{font-size:13.5px;font-weight:600;color:var(--amber);letter-spacing:.01em;
  text-transform:uppercase;font-feature-settings:"smcp"}
.hero__title{font-family:var(--serif);font-weight:500;letter-spacing:-.02em;line-height:1.02;
  font-size:clamp(2.7rem,6vw,4.7rem);margin:18px 0 22px}
.hero__title span{display:block}
.hero__em{font-style:italic;color:var(--teal)}
.hero__em::after{content:"";display:block;width:140px;height:10px;margin-top:6px;border-radius:8px;
  background:linear-gradient(90deg,var(--amber),transparent)}
.hero__lede{font-size:18px;color:var(--ink-soft);max-width:46ch}
.hero__cta{display:flex;gap:12px;margin:26px 0 28px;flex-wrap:wrap}
.hero__stats{display:flex;gap:30px;list-style:none}
.hero__stats li{display:flex;flex-direction:column}
.hero__stats strong{font-family:var(--serif);font-size:30px;font-weight:600;line-height:1}
.hero__stats span{font-size:12.5px;color:var(--ink-mute);margin-top:3px}

.hero__panel{position:relative;height:430px}
.float-card{position:absolute;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}
.float-card--chat{top:0;left:0;width:280px;animation:floaty 7s ease-in-out infinite}
.float-card--mentor{bottom:30px;left:24px;width:262px;display:flex;align-items:center;gap:11px;
  animation:floaty 8s ease-in-out infinite .6s}
.float-card--streak{top:64px;right:0;width:150px;display:flex;align-items:center;gap:12px;
  background:linear-gradient(150deg,var(--teal),var(--teal-2));color:#f6efe3;border:0;
  animation:floaty 6.5s ease-in-out infinite .3s}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.float-card__head{display:flex;align-items:center;gap:8px;font-weight:600;font-size:13px;margin-bottom:10px;color:var(--teal)}
.bubble{font-size:13.5px;line-height:1.45;padding:11px 13px;border-radius:13px}
.bubble--ai{background:var(--paper-2);color:var(--ink);border-bottom-left-radius:4px}
.float-chips{display:flex;gap:6px;margin-top:9px}
.float-chips span{font-size:11.5px;font-weight:600;color:var(--teal);background:var(--amber-soft);
  border:1px solid #f3d3b3;padding:4px 9px;border-radius:999px}
.float-card--mentor strong{font-size:14px;display:block}
.float-card--mentor .muted{font-size:12px}
.float-card__slot{margin-left:auto;font-size:11.5px;font-weight:600;color:var(--teal);
  background:var(--amber-soft);padding:5px 8px;border-radius:8px;text-align:center;line-height:1.2}
.float-card--streak .big{font-family:var(--serif);font-size:46px;font-weight:600;line-height:.9}
.float-card--streak span:last-child{font-size:12.5px;line-height:1.3}
.float-card--streak em{color:var(--amber-2);font-style:normal;font-weight:600}

/* how it works */
.how{max-width:1080px;margin:60px auto 0;padding:50px 26px;border-top:1px solid var(--line)}
.section-kicker{font-size:13px;font-weight:700;color:var(--amber);text-transform:uppercase;letter-spacing:.08em}
.section-title{font-family:var(--serif);font-weight:500;font-size:clamp(1.9rem,3.4vw,2.7rem);
  letter-spacing:-.02em;margin:8px 0 34px}
.how__grid{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.how__step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;
  transition:transform .25s ease,box-shadow .25s ease}
.how__step:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.how__no{font-family:var(--mono);font-size:13px;color:var(--amber);font-weight:500}
.how__step h3{font-family:var(--serif);font-weight:600;font-size:21px;margin:14px 0 8px;letter-spacing:-.01em}
.how__step p{font-size:14.5px;color:var(--ink-soft)}
.how__cta{text-align:center;margin-top:38px}

.landing-foot{max-width:1080px;margin:30px auto 0;padding:26px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;font-size:13px;color:var(--ink-mute)}
.landing-foot a:hover{color:var(--teal)}

/* ============ DASHBOARD ============ */
.dash-greet{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:34px;flex-wrap:wrap}
.dash-greet__h{font-family:var(--serif);font-weight:500;font-size:clamp(2rem,4vw,3rem);letter-spacing:-.02em;margin:4px 0 8px}
.streak-card{background:linear-gradient(155deg,var(--teal),var(--teal-2));color:#f6efe3;
  border-radius:var(--radius);padding:18px 22px;box-shadow:var(--shadow);min-width:200px}
.streak-card__num{font-family:var(--serif);font-size:46px;font-weight:600;line-height:1;display:flex;align-items:center;gap:8px}
.streak-card__flame{color:var(--amber-2);font-size:26px}
.streak-card>span{font-size:13px;opacity:.85}
.streak-card__week{display:flex;gap:7px;margin-top:14px}
.streak-card__week i{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;
  font-size:11px;font-style:normal;font-weight:600;background:rgba(255,255,255,.12);color:rgba(246,239,227,.6)}
.streak-card__week i.on{background:var(--amber);color:#2a1808}
.streak-card__week i.today{background:#f6efe3;color:var(--teal);box-shadow:0 0 0 2px var(--amber)}

.dash-grid{display:grid;grid-template-columns:1fr 320px;gap:24px;align-items:start}
.block-title{font-family:var(--serif);font-weight:600;font-size:22px;margin:0 0 14px;letter-spacing:-.01em}
.dash-main .block-title:not(:first-child){margin-top:30px}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-soft)}
.card__kicker{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--ink-mute);margin-bottom:12px}

/* paths */
.paths{display:grid;gap:14px}
.path{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;
  display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;
  transition:transform .2s ease,box-shadow .2s ease}
.path:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.path__icon{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:22px;
  background:var(--amber-soft)}
.path__body h3{font-family:var(--serif);font-weight:600;font-size:18px;letter-spacing:-.01em}
.path__body p{font-size:13px;color:var(--ink-mute)}
.path__prog{margin-top:8px;height:8px;background:var(--paper-2);border-radius:999px;overflow:hidden}
.path__prog span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--amber),var(--amber-2));
  width:0;transition:width 1s cubic-bezier(.2,.7,.2,1)}
.path__pct{font-family:var(--serif);font-size:24px;font-weight:600;color:var(--teal);min-width:54px;text-align:right}

/* recos */
.recos{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.reco{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px;
  transition:transform .2s ease,box-shadow .2s ease;cursor:pointer}
.reco:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#f1c79f}
.reco__tag{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--amber)}
.reco h4{font-family:var(--serif);font-weight:600;font-size:16.5px;margin:7px 0 4px;letter-spacing:-.01em}
.reco p{font-size:12.5px;color:var(--ink-mute)}
.reco__meta{display:flex;align-items:center;gap:6px;margin-top:12px;font-size:12px;color:var(--ink-soft);font-weight:600}

/* side */
.session-card__who{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.session-card__who strong{display:block;font-size:15px}
.session-card__who .muted{font-size:12.5px}
.session-card__meta{display:grid;gap:10px;margin-bottom:16px}
.session-card__meta div{display:flex;justify-content:space-between;gap:12px;font-size:13px;border-bottom:1px dashed var(--line);padding-bottom:9px}
.session-card__meta dt{color:var(--ink-mute)}
.session-card__meta dd{font-weight:600;text-align:right}
.session-card__actions{display:grid;gap:8px}

.goal-card{text-align:center}
.ring{--p:0;width:128px;height:128px;border-radius:50%;margin:6px auto 14px;display:grid;place-items:center;
  background:conic-gradient(var(--amber) calc(var(--p)*1%),var(--paper-2) 0)}
.ring::before{content:"";position:absolute;width:96px;height:96px;border-radius:50%;background:var(--card)}
.ring span{position:relative;font-family:var(--serif);font-size:30px;font-weight:600;color:var(--teal)}

/* ============ AI TUTOR ============ */
.tutor-layout{max-width:1180px;margin:0 auto;padding:24px 26px;display:grid;
  grid-template-columns:300px 1fr;gap:22px;height:calc(100vh - 64px);min-height:560px}
.lesson-ctx{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow-soft);overflow:auto}
.lesson-ctx__title{font-family:var(--serif);font-weight:600;font-size:24px;letter-spacing:-.01em;margin-top:2px}
.lesson-ctx__path{font-size:12.5px;margin:4px 0 14px}
.lesson-ctx__bar{height:7px;background:var(--paper-2);border-radius:999px;overflow:hidden;margin-bottom:18px}
.lesson-ctx__bar span{display:block;height:100%;background:linear-gradient(90deg,var(--teal),var(--teal-2));border-radius:999px}
.lesson-ctx__list{list-style:none;display:grid;gap:3px}
.lesson-ctx__list li{font-size:13.5px;color:var(--ink-soft);padding:8px 10px 8px 30px;border-radius:10px;position:relative}
.lesson-ctx__list li::before{content:"○";position:absolute;left:10px;color:var(--ink-mute)}
.lesson-ctx__list li.done{color:var(--ink-mute)}
.lesson-ctx__list li.done::before{content:"✓";color:var(--ok)}
.lesson-ctx__list li.current{background:var(--amber-soft);color:var(--ink);font-weight:600}
.lesson-ctx__list li.current::before{content:"●";color:var(--amber)}
.lesson-ctx__tip{margin-top:20px;background:var(--paper-2);border-radius:var(--radius-sm);padding:15px}
.lesson-ctx__tip strong{font-size:13px;color:var(--teal)}
.lesson-ctx__tip p{font-size:12.5px;color:var(--ink-soft);margin:6px 0 11px}
.lesson-ctx__list button{display:block;width:100%;text-align:left;font:inherit;color:inherit;background:transparent;border:0;padding:0;cursor:pointer}
.lesson-ctx__list button:hover{color:var(--teal)}

.chat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-soft);
  display:flex;flex-direction:column;overflow:hidden}
.chat__head{display:flex;align-items:center;gap:11px;padding:16px 20px;border-bottom:1px solid var(--line);
  background:var(--card)}
.chat__head strong{font-size:15px}
.status-dot{display:block;font-size:12px;color:var(--ok)}
.status-dot::before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--ok);margin-right:6px;
  box-shadow:0 0 0 3px rgba(63,125,82,.2)}
.chat__log{flex:1;overflow:auto;padding:22px 20px;display:flex;flex-direction:column;gap:16px}
.msg{display:flex;gap:10px;max-width:80%;animation:rise .4s ease}
.msg--me{align-self:flex-end;flex-direction:row-reverse}
.msg__av{width:30px;height:30px;border-radius:9px;flex:none;display:grid;place-items:center;font-size:12px;font-weight:700;color:#fff}
.msg--ai .msg__av{background:linear-gradient(150deg,var(--teal),var(--teal-2))}
.msg--me .msg__av{background:linear-gradient(150deg,var(--amber),var(--amber-2));color:#2a1808}
.msg__body{font-size:14.5px;line-height:1.5;padding:12px 15px;border-radius:15px}
.msg--ai .msg__body{background:var(--paper-2);border-top-left-radius:5px}
.msg--me .msg__body{background:linear-gradient(150deg,var(--teal),var(--teal-2));color:#f6efe3;border-top-right-radius:5px}

/* concept card inside reply */
.concept{margin-top:11px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;
  box-shadow:var(--shadow-soft)}
.concept__head{display:flex;align-items:center;gap:8px;padding:10px 14px;background:var(--teal);color:#f6efe3;
  font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.05em}
.concept__head .tag{margin-left:auto;background:var(--amber);color:#2a1808;padding:2px 8px;border-radius:999px;
  font-size:10.5px;letter-spacing:.03em}
.concept pre{margin:0;padding:14px;background:#13302d;color:#e9e0cf;font-family:var(--mono);font-size:12.5px;
  line-height:1.6;overflow:auto}
.concept pre .k{color:#f2a65a}.concept pre .c{color:#7fae8a}.concept pre .s{color:#e8c07d}
.concept__note{padding:11px 14px;font-size:13px;color:var(--ink-soft)}
.quiz{padding:13px 14px;display:grid;gap:8px}
.quiz__q{font-size:13.5px;font-weight:600;margin-bottom:2px}
.quiz__opt{text-align:left;font-size:13px;background:var(--paper-2);border:1px solid var(--line);border-radius:10px;
  padding:9px 12px;cursor:pointer;font-family:var(--sans);transition:.15s}
.quiz__opt:hover{border-color:var(--teal)}
.quiz__opt.right{background:#e2f0e4;border-color:var(--ok);color:var(--ok);font-weight:600}
.quiz__opt.wrong{background:#f7e2da;border-color:var(--amber);color:#b8501f}

.typing{display:flex;gap:4px;padding:14px 16px}
.typing span{width:7px;height:7px;border-radius:50%;background:var(--ink-mute);animation:blink 1.2s infinite}
.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.25;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}

.chat__suggest{display:flex;gap:8px;padding:12px 20px 0;flex-wrap:wrap}
.chat__suggest button{font-family:var(--sans);font-size:12.5px;font-weight:600;color:var(--teal);
  background:var(--amber-soft);border:1px solid #f3d3b3;padding:8px 13px;border-radius:999px;cursor:pointer;transition:.18s}
.chat__suggest button:hover{background:#f9dcc1;transform:translateY(-2px)}
.chat__compose{display:flex;gap:10px;padding:16px 20px}
.chat__compose input{flex:1;font-family:var(--sans);font-size:14.5px;padding:13px 16px;border-radius:999px;
  border:1.5px solid var(--line);background:var(--paper);color:var(--ink)}
.chat__compose input:focus{outline:none;border-color:var(--amber);background:#fff}

/* ============ MENTORS / BOOKING ============ */
.mentors-head{margin-bottom:28px}
.mentors-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.mentor{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow-soft);transition:transform .22s ease,box-shadow .22s ease;display:flex;flex-direction:column}
.mentor:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.mentor__top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.mentor__top strong{font-family:var(--serif);font-weight:600;font-size:18px;display:block;letter-spacing:-.01em}
.mentor__role{font-size:12.5px;color:var(--ink-mute)}
.mentor__rate{margin-left:auto;text-align:right}
.mentor__stars{color:var(--gold);font-size:13px;letter-spacing:1px}
.mentor__rate small{display:block;font-size:11px;color:var(--ink-mute)}
.mentor__bio{font-size:13.5px;color:var(--ink-soft);flex:1}
.mentor__tags{display:flex;flex-wrap:wrap;gap:6px;margin:13px 0 16px}
.mentor__tags span{font-size:11.5px;font-weight:600;color:var(--teal);background:var(--paper-2);padding:5px 10px;border-radius:999px}
.mentor__foot{display:flex;align-items:center;justify-content:space-between;gap:10px}
.mentor__next{font-size:12px;color:var(--ink-mute)}
.mentor__next b{color:var(--teal)}

/* booking panel */
.booking{position:fixed;inset:0;z-index:50;background:rgba(35,32,28,.45);backdrop-filter:blur(3px);
  display:grid;place-items:center;padding:24px;animation:fade .3s ease}
.booking__inner{background:var(--paper);border-radius:24px;max-width:560px;width:100%;box-shadow:var(--shadow);
  overflow:hidden;animation:rise .4s ease}
.booking__who{display:flex;align-items:center;gap:14px;padding:22px 24px;background:var(--card);border-bottom:1px solid var(--line);position:relative}
.booking__who strong{font-family:var(--serif);font-size:20px;display:block}
.booking__who .muted{font-size:12.5px;display:block}
.booking__close{position:absolute;top:16px;right:18px;width:32px;height:32px;border-radius:50%;border:1px solid var(--line);
  background:var(--paper);font-size:20px;line-height:1;cursor:pointer;color:var(--ink-soft)}
.booking__close:hover{background:var(--paper-2)}
.booking__cal{padding:22px 24px 26px}
.daypick{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.daypick button,.slots button{font-family:var(--sans);cursor:pointer;border:1.5px solid var(--line);background:var(--card);
  border-radius:12px;padding:10px 6px;text-align:center;transition:.15s;color:var(--ink)}
.daypick button{display:grid;gap:2px}
.daypick button span{font-size:11px;color:var(--ink-mute)}
.daypick button b{font-family:var(--serif);font-size:19px}
.daypick button:hover,.slots button:hover{border-color:var(--amber)}
.daypick button.sel,.slots button.sel{background:var(--teal);border-color:var(--teal);color:#f6efe3}
.daypick button.sel span{color:var(--amber-2)}
.slots{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.slots button{font-size:13px;font-weight:600}
.slots button:disabled{opacity:.35;cursor:not-allowed;text-decoration:line-through}
#bkConfirm{margin-top:20px}

/* confirmation */
.confirm{position:fixed;inset:0;z-index:80;background:rgba(35,32,28,.5);backdrop-filter:blur(4px);
  display:grid;place-items:center;padding:24px;animation:fade .3s ease}
.confirm__card{background:var(--paper);border-radius:24px;padding:38px 34px;max-width:430px;text-align:center;
  box-shadow:var(--shadow);animation:pop .45s cubic-bezier(.2,1.3,.4,1)}
@keyframes pop{from{opacity:0;transform:scale(.9)}to{opacity:1;transform:none}}
.confirm__check{width:64px;height:64px;border-radius:50%;margin:0 auto 16px;display:grid;place-items:center;
  font-size:30px;color:#fff;background:linear-gradient(150deg,var(--ok),#5aa06f);box-shadow:0 12px 24px -10px rgba(63,125,82,.6)}
.confirm__card h3{font-family:var(--serif);font-weight:600;font-size:26px;letter-spacing:-.01em}
.confirm__card p{color:var(--ink-soft);margin:8px 0 22px;font-size:14.5px}
.confirm__actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* ============ VIDEO LOBBY (mock) ============ */
.lobby{position:fixed;inset:0;z-index:75;background:rgba(35,32,28,.6);backdrop-filter:blur(4px);
  display:grid;place-items:center;padding:24px;animation:fade .3s ease}
.lobby__card{background:var(--paper);border-radius:24px;max-width:420px;width:100%;padding:30px 28px 26px;
  text-align:center;box-shadow:var(--shadow);animation:pop .45s cubic-bezier(.2,1.3,.4,1)}
.lobby__stage{padding:14px 0 24px}
.lobby__stage .avatar{width:72px;height:72px;font-size:24px;margin-bottom:14px}
.lobby__name{font-family:var(--serif);font-size:20px;font-weight:600;letter-spacing:-.01em}
.lobby__wait{font-size:13.5px;color:var(--ink-mute);margin-top:6px;display:flex;align-items:center;justify-content:center;gap:8px}
.lobby__pulse{width:9px;height:9px;border-radius:50%;background:var(--amber);animation:pulse 1.3s infinite}
@keyframes pulse{0%,100%{opacity:.3;transform:scale(.8)}50%{opacity:1;transform:scale(1.25)}}
.lobby__controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.lobby__btn{font-family:var(--sans);font-weight:600;font-size:13px;background:var(--card);border:1.5px solid var(--line);
  border-radius:999px;padding:10px 16px;cursor:pointer;color:var(--ink);transition:.15s}
.lobby__btn:hover{border-color:var(--teal)}
.lobby__btn[aria-pressed="true"]{background:var(--paper-2);color:var(--ink-mute);text-decoration:line-through}
.lobby__btn--end{background:linear-gradient(150deg,#c0506a,#e07a92);color:#fff;border-color:transparent}
.lobby__btn--end:hover{border-color:transparent;opacity:.92}

/* toast */
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);z-index:90;background:var(--teal);color:#f6efe3;
  padding:12px 20px;border-radius:999px;font-size:13.5px;font-weight:600;box-shadow:var(--shadow);
  max-width:90vw;text-align:center;animation:toastIn .3s ease}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,12px)}to{opacity:1;transform:translate(-50%,0)}}
.quiz__next{margin-top:4px}

/* ============ RESPONSIVE ============ */
@media (max-width:900px){
  .hero{grid-template-columns:1fr;gap:30px}
  .hero__panel{height:360px;max-width:340px}
  .how__grid{grid-template-columns:1fr}
  .dash-grid{grid-template-columns:1fr}
  .tutor-layout{grid-template-columns:1fr;height:auto}
  .lesson-ctx{order:2}
  .chat{height:72vh;min-height:480px;order:1}
  .appbar__nav{display:none}
}
@media (max-width:560px){
  .landing-nav__links a:not(.btn){display:none}
  .appbar__right .streak-chip{display:none}
  .slots{grid-template-columns:repeat(3,1fr)}
  .daypick{grid-template-columns:repeat(3,1fr)}
  .hero__stats{gap:20px}
}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:6px}