/*
 * StudiAI 6.0 – Premium Product Design System
 * Dark-first, light-mode ready, responsive and dependency-free.
 */
:root,
:root[data-theme="dark"]{
  --blue:#2f75ff;
  --blue2:#1858d9;
  --cyan:#22d3ee;
  --teal:#14b8a6;
  --purple:#8b5cf6;
  --green:#22c55e;
  --red:#ef4444;
  --orange:#f59e0b;
  --navy:#07111f;
  --ink:#f6f9ff;
  --text:#e7eefc;
  --muted:#93a4bd;
  --muted-strong:#b7c4d8;
  --bg:#07111f;
  --bg-elevated:#0b1728;
  --card:#0e1d31;
  --card-strong:#12243b;
  --card-soft:#0b192b;
  --surface:#0a1626;
  --surface-hover:#132741;
  --line:rgba(148,171,207,.16);
  --line-strong:rgba(117,156,219,.28);
  --focus:rgba(47,117,255,.28);
  --shadow:0 22px 70px rgba(0,0,0,.32);
  --shadow-soft:0 12px 36px rgba(0,0,0,.22);
  --glass:rgba(10,22,38,.86);
  --radius:18px;
  --radius-lg:26px;
  --sidebar-width:268px;
  --header-height:72px;
  --page-width:1480px;
  --hero-grid-opacity:.38;
}
:root[data-theme="light"]{
  --blue:#2563eb;
  --blue2:#174fc7;
  --cyan:#0891b2;
  --teal:#0f9f8f;
  --purple:#7c3aed;
  --green:#16a34a;
  --red:#dc2626;
  --orange:#d97706;
  --navy:#0d1b2e;
  --ink:#0f172a;
  --text:#1e293b;
  --muted:#64748b;
  --muted-strong:#475569;
  --bg:#f4f7fb;
  --bg-elevated:#edf2f8;
  --card:#ffffff;
  --card-strong:#ffffff;
  --card-soft:#f8fafc;
  --surface:#ffffff;
  --surface-hover:#eef4ff;
  --line:#dbe4f0;
  --line-strong:#bfd0e6;
  --focus:rgba(37,99,235,.16);
  --shadow:0 22px 60px rgba(15,39,75,.12);
  --shadow-soft:0 10px 28px rgba(15,39,75,.08);
  --glass:rgba(255,255,255,.88);
  --hero-grid-opacity:.17;
}

html{background:var(--bg);color-scheme:dark;scroll-padding-top:92px}
html[data-theme="light"]{color-scheme:light}
body{
  color:var(--text);
  background:
    radial-gradient(circle at 78% -10%,rgba(47,117,255,.16),transparent 30rem),
    radial-gradient(circle at -10% 30%,rgba(34,211,238,.08),transparent 28rem),
    var(--bg);
  min-height:100vh;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  letter-spacing:-.005em;
}
body::selection{background:rgba(47,117,255,.35);color:#fff}
a,button,input,select,textarea{transition:border-color .18s ease,background .18s ease,color .18s ease,box-shadow .18s ease,transform .18s ease,opacity .18s ease}
.ui-icon{width:20px;height:20px;display:block;flex:0 0 auto}
.muted{color:var(--muted)!important}.small{font-size:13px}.hidden{display:none!important}

/* Brand */
.brand-v6{gap:11px;color:var(--ink)}
.brand-v6 img{width:42px;height:42px;filter:drop-shadow(0 8px 18px rgba(37,99,235,.22))}
.brand-v6 strong{font-size:19px;letter-spacing:-.4px;line-height:1.05}
.brand-v6 strong::first-letter{letter-spacing:-.7px}
.brand-v6 small{font-size:11px;color:var(--muted);margin-top:3px}

/* Theme switch */
.theme-toggle{
  min-height:40px;display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:8px 11px;border:1px solid var(--line);border-radius:12px;
  background:var(--card-soft);color:var(--muted-strong);font-weight:750;font-size:13px
}
.theme-toggle:hover{background:var(--surface-hover);border-color:var(--line-strong);color:var(--ink);transform:translateY(-1px)}
.theme-toggle .ui-icon{width:17px;height:17px}
.theme-toggle-sun,.theme-toggle-moon{display:none}
:root[data-theme="dark"] .theme-toggle-sun{display:block}
:root[data-theme="light"] .theme-toggle-moon{display:block}

/* Buttons */
.btn{
  min-height:42px;border-radius:12px;padding:10px 16px;font-weight:780;letter-spacing:-.01em;
  border:1px solid transparent;box-shadow:none
}
.btn .ui-icon{width:18px;height:18px}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{
  color:#fff;background:linear-gradient(135deg,#2f75ff 0%,#1764ec 68%,#1352c5 100%);
  box-shadow:0 10px 26px rgba(37,99,235,.27);border-color:rgba(105,160,255,.25)
}
.btn-primary:hover{box-shadow:0 14px 32px rgba(37,99,235,.36);filter:saturate(1.08)}
.btn-secondary{background:rgba(47,117,255,.13);color:#78a8ff;border-color:rgba(79,137,236,.24)}
:root[data-theme="light"] .btn-secondary{color:var(--blue2);background:#eaf1ff}
.btn-ghost{background:var(--card-soft);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:var(--surface-hover);border-color:var(--line-strong)}
.btn-danger{background:rgba(239,68,68,.10);color:#ff7c7c;border-color:rgba(239,68,68,.28)}
.btn-success{background:rgba(34,197,94,.12);color:#48da7c;border-color:rgba(34,197,94,.24)}
.btn-sm{min-height:34px;padding:7px 11px;border-radius:10px;font-size:12.5px}
.btn-large{min-height:50px;padding:13px 21px;border-radius:14px;font-size:15px}

/* Public navigation */
.public-header-v6{
  position:sticky;top:0;z-index:60;border-bottom:1px solid var(--line);
  background:color-mix(in srgb,var(--glass) 92%,transparent);backdrop-filter:blur(18px) saturate(1.25)
}
.public-header-inner{height:76px;max-width:var(--page-width);margin:auto;padding:0 24px;display:flex;align-items:center;gap:28px}
.public-nav-v6{display:flex;align-items:center;gap:5px;margin:auto}
.public-nav-v6 a{padding:10px 13px;border-radius:10px;color:var(--muted-strong);font-size:14px;font-weight:720}
.public-nav-v6 a:hover{color:var(--ink);background:var(--surface-hover)}
.public-actions-v6{display:flex;align-items:center;gap:9px;margin-left:auto}
.nav-menu-button{display:none;width:42px;height:42px;padding:10px;border:1px solid var(--line);border-radius:12px;background:var(--card-soft);color:var(--ink)}

/* App shell */
.app-shell-v6{min-height:100vh;display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr)}
.app-sidebar-v6{
  position:fixed;inset:0 auto 0 0;width:var(--sidebar-width);z-index:70;display:flex;flex-direction:column;
  background:linear-gradient(180deg,#091525 0%,#07111f 100%);border-right:1px solid rgba(127,158,204,.14);
  box-shadow:18px 0 70px rgba(0,0,0,.16)
}
:root[data-theme="light"] .app-sidebar-v6{background:linear-gradient(180deg,#ffffff 0%,#f7f9fd 100%);border-right-color:var(--line);box-shadow:10px 0 34px rgba(25,51,88,.06)}
.sidebar-brand-row{height:82px;display:flex;align-items:center;padding:0 20px;border-bottom:1px solid var(--line)}
.sidebar-close{display:none;margin-left:auto;width:36px;height:36px;padding:8px;border:0;border-radius:10px;background:var(--card-soft);color:var(--text)}
.sidebar-scroll{flex:1;min-height:0;overflow-y:auto;padding:18px 13px 22px;scrollbar-width:thin;scrollbar-color:rgba(120,150,195,.25) transparent}
.nav-section{display:grid;gap:3px;margin-bottom:20px}
.nav-section-title{padding:0 12px 7px;color:#637691;font-size:10px;font-weight:850;text-transform:uppercase;letter-spacing:.14em}
.app-nav-link{display:flex;align-items:center;gap:11px;padding:10px 12px;border-radius:11px;color:#8fa1ba;font-size:13.5px;font-weight:680;position:relative}
.app-nav-link:hover{color:#eaf2ff;background:rgba(94,143,219,.09)}
.app-nav-link.active{color:#fff;background:linear-gradient(135deg,rgba(47,117,255,.98),rgba(28,91,213,.92));box-shadow:0 10px 24px rgba(37,99,235,.25)}
:root[data-theme="light"] .app-nav-link{color:#5d6d83}
:root[data-theme="light"] .app-nav-link:hover{color:#0e2b58;background:#eaf1ff}
:root[data-theme="light"] .app-nav-link.active{color:#fff}
.app-nav-icon{width:20px;height:20px;display:grid;place-items:center}
.app-nav-icon .ui-icon{width:18px;height:18px}
.sidebar-footer{margin:0 13px 14px;padding:12px;display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.035)}
:root[data-theme="light"] .sidebar-footer{background:#fff}
.sidebar-user{display:flex;align-items:center;gap:10px;min-width:0;flex:1}
.sidebar-user .avatar,.header-avatar{background:linear-gradient(135deg,#2f75ff,#7c3aed);box-shadow:0 7px 18px rgba(37,99,235,.24)}
.sidebar-user span:last-child{display:grid;min-width:0}
.sidebar-user strong{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:13px;color:var(--ink)}
.sidebar-user small{font-size:11px;color:var(--muted)}
.sidebar-logout{width:34px;height:34px;display:grid;place-items:center;border-radius:10px;color:var(--muted)}
.sidebar-logout:hover{color:#ff7b7b;background:rgba(239,68,68,.09)}
.sidebar-logout .ui-icon{width:17px;height:17px}
.app-main-v6{grid-column:2;min-width:0;min-height:100vh}
.app-header-v6{
  position:sticky;top:0;z-index:50;height:var(--header-height);display:flex;align-items:center;gap:16px;padding:0 25px;
  background:color-mix(in srgb,var(--glass) 90%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(18px) saturate(1.25)
}
.app-header-title{display:grid;line-height:1.1}.app-header-title .eyebrow{font-size:9px;margin:0 0 4px}.app-header-title strong{font-size:15px;color:var(--ink)}
.app-header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.header-action{display:flex;align-items:center;gap:7px;min-height:39px;padding:8px 11px;border:1px solid var(--line);border-radius:11px;background:var(--card-soft);color:var(--muted-strong);font-size:12.5px;font-weight:730}
.header-action:hover{background:var(--surface-hover);color:var(--ink);border-color:var(--line-strong)}
.header-action .ui-icon{width:17px;height:17px}
.header-avatar{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;color:#fff;font-weight:850;font-size:13px;margin-left:2px}
.app-overlay{display:none}

/* Main content */
.page{max-width:var(--page-width);padding:30px 28px 72px;margin:0 auto}
.page-narrow{max-width:980px}.page-head{align-items:center;margin-bottom:24px}
.page-head h1{font-size:32px;color:var(--ink);letter-spacing:-.85px}.page-head p{color:var(--muted);max-width:760px}
.eyebrow{color:#6fa1ff;letter-spacing:.13em;font-size:10px;font-weight:850}
.section{margin-top:28px}.section-title{margin-bottom:15px}.section-title h2{font-size:20px;color:var(--ink);letter-spacing:-.35px}
.grid{gap:15px}.grid-2{gap:16px}.grid-3{gap:16px}.grid-4{gap:14px}
.card,.stat-card,.subject-card,.adaptive-recommendation-card,.creator-status-card,.quality-report-card,.step,.module-mini,.marketplace-hero-panel,.marketplace-hero-card{
  background:linear-gradient(180deg,color-mix(in srgb,var(--card) 96%,#fff 4%),var(--card));
  border:1px solid var(--line);box-shadow:var(--shadow-soft);color:var(--text)
}
.card{border-radius:17px;padding:20px}.card:hover{border-color:var(--line-strong)}
.card h1,.card h2,.card h3{color:var(--ink)}
.pill{background:rgba(125,151,191,.12);color:var(--muted-strong);border:1px solid rgba(144,170,209,.10);font-size:11px;padding:4px 8px}
.pill-blue{background:rgba(47,117,255,.14);color:#74a5ff;border-color:rgba(47,117,255,.20)}
.pill-green{background:rgba(34,197,94,.12);color:#54d982;border-color:rgba(34,197,94,.18)}
.pill-red{background:rgba(239,68,68,.12);color:#ff7d7d;border-color:rgba(239,68,68,.18)}
.pill-orange{background:rgba(245,158,11,.13);color:#ffc04f;border-color:rgba(245,158,11,.18)}
.pill-pink{background:rgba(219,39,119,.13);color:#ff81bd;border-color:rgba(219,39,119,.18)}
:root[data-theme="light"] .pill-blue{color:#215dc7}:root[data-theme="light"] .pill-green{color:#08793a}:root[data-theme="light"] .pill-orange{color:#a75a00}:root[data-theme="light"] .pill-red{color:#bd2929}
.notice,.flash{border-radius:13px;border:1px solid var(--line);background:var(--card);color:var(--text)}
.notice.good,.flash-success{background:rgba(34,197,94,.09);border-color:rgba(34,197,94,.25);color:#72e398}
.notice.bad,.flash-error{background:rgba(239,68,68,.09);border-color:rgba(239,68,68,.25);color:#ff8b8b}
.notice.warn{background:rgba(245,158,11,.10);border-color:rgba(245,158,11,.25);color:#ffc568}
.flash{max-width:calc(var(--page-width) - 56px);margin:16px auto 0;padding:13px 16px}

/* Stats */
.stats-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
.stat-card{border-radius:15px;padding:16px;gap:12px;min-width:0}
.stat-icon{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,rgba(47,117,255,.18),rgba(34,211,238,.08));color:#70a2ff;border:1px solid rgba(78,135,231,.16)}
.stat-icon .ui-icon{width:20px;height:20px}
.stat-card small{font-size:11px;color:var(--muted)}
.stat-card strong{font-size:22px;color:var(--ink);letter-spacing:-.45px}
.stat-card span:not(.stat-icon){font-size:10.5px;color:var(--muted)}

/* Subjects and course cards */
.subject-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.subject-card{border-radius:16px;padding:17px;grid-template-columns:48px 1fr auto;gap:13px;box-shadow:var(--shadow-soft)}
.subject-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);background:var(--card-strong)}
.subject-icon{width:45px;height:45px;border-radius:13px;background:color-mix(in srgb,var(--subject-color) 25%,var(--card));color:color-mix(in srgb,var(--subject-color) 80%,white);border:1px solid color-mix(in srgb,var(--subject-color) 32%,transparent)}
.subject-icon .ui-icon{width:21px;height:21px}
.subject-card h3{color:var(--ink);font-size:17px}.subject-card p{color:var(--muted);font-size:12.5px;line-height:1.45}
.subject-code{font-size:10px}.card-arrow{color:var(--muted);align-self:center}.card-arrow .ui-icon{width:18px}
.subject-content-badges{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.content-badge{display:inline-flex;gap:5px;align-items:center;padding:4px 7px;border:1px solid var(--line);border-radius:8px;background:var(--card-soft);font-size:10px;color:var(--muted)}.content-badge .ui-icon{width:12px;height:12px}
.subject-content-empty{color:var(--muted);font-size:11px;margin-top:9px}
.progress{background:rgba(132,154,190,.16);height:6px}.progress i{background:linear-gradient(90deg,var(--blue),var(--cyan));box-shadow:0 0 12px rgba(47,117,255,.35)}.progress-row strong{color:var(--muted-strong)}
.course-card{border-radius:17px;position:relative;overflow:hidden}.course-card::before{content:"";position:absolute;inset:0 0 auto;height:3px;background:linear-gradient(90deg,var(--blue),var(--cyan),var(--purple));opacity:.7}.course-card h3{font-size:17px}.course-card p{font-size:12.5px;line-height:1.5}.course-footer{border-color:var(--line)}

/* Forms */
.field label{color:var(--muted-strong);font-size:12.5px}.field input,.field select,.field textarea,.marketplace-search input,.marketplace-search select{
  color:var(--text);background:var(--card-soft);border:1px solid var(--line);border-radius:11px;padding:12px 13px
}
.field input::placeholder,.field textarea::placeholder,.marketplace-search input::placeholder{color:color-mix(in srgb,var(--muted) 75%,transparent)}
.field input:focus,.field select:focus,.field textarea:focus,.marketplace-search input:focus,.marketplace-search select:focus{border-color:#568df0;box-shadow:0 0 0 4px var(--focus);background:var(--card)}
.checkbox{color:var(--muted-strong)}.checkbox input{accent-color:var(--blue)}
.task-type-fieldset{background:var(--card-soft)!important;border-color:var(--line)!important}.task-type-card{background:var(--card)!important;border-color:var(--line)!important}.task-type-card:has(input:checked){background:rgba(47,117,255,.10)!important;border-color:rgba(68,132,244,.55)!important}.task-type-copy strong{color:var(--ink)!important}.task-type-copy small{color:var(--muted)!important}
.password-toggle{background:var(--surface-hover);color:var(--muted-strong)}

/* Tables and admin */
.table-wrap,.admin-table,.content-table{border-color:var(--line);background:var(--card);border-radius:16px;box-shadow:var(--shadow-soft);overflow:auto}
table{color:var(--text)}th{color:var(--muted);background:var(--card-soft);font-size:10px;letter-spacing:.06em;text-transform:uppercase}td,th{border-color:var(--line)!important}tbody tr:hover{background:rgba(47,117,255,.035)}
.admin-shell{grid-template-columns:210px minmax(0,1fr);gap:18px}.admin-side{top:94px;background:var(--card);border-color:var(--line);box-shadow:var(--shadow-soft)}.admin-side a{color:var(--muted-strong)}.admin-side a.active,.admin-side a:hover{background:rgba(47,117,255,.12);color:#77a7ff}.admin-panel,.admin-card{background:var(--card);border-color:var(--line)}

/* Authentication */
.auth-shell{min-height:calc(100vh - 76px);max-width:1180px;grid-template-columns:1.05fr .75fr;padding:46px 24px;gap:22px}
.auth-promo{min-height:610px;border:1px solid rgba(88,134,214,.25);background:
  linear-gradient(150deg,rgba(8,25,48,.95),rgba(7,17,31,.98)),url("brand/studiai-wave.svg") center bottom/100% 46% no-repeat;
  border-radius:25px;padding:48px;box-shadow:var(--shadow);color:#fff
}
:root[data-theme="light"] .auth-promo{background:linear-gradient(150deg,#0b1c34,#07111f),url("brand/studiai-wave.svg") center bottom/100% 46% no-repeat}
.auth-promo h1{font-size:50px;letter-spacing:-1.6px}.auth-promo p{color:#b9c9e1}.auth-promo li{color:#dfe9f8}
.auth-card{background:var(--card);border-color:var(--line);border-radius:22px;box-shadow:var(--shadow);padding:30px}
.auth-card h1{color:var(--ink)}.tabs{background:var(--card-soft)}.tabs button{color:var(--muted)}.tabs button.active{background:var(--card);color:var(--ink);box-shadow:var(--shadow-soft)}

/* Practice */
.practice-layout{max-width:940px}.question-card{background:var(--card);border-color:var(--line);box-shadow:var(--shadow);border-radius:20px}.question-card h1{color:var(--ink)}
.answer-option{background:var(--card-soft);border-color:var(--line);color:var(--text)}.answer-option:hover{background:var(--surface-hover);border-color:var(--line-strong)}.answer-option.selected{background:rgba(47,117,255,.12);border-color:#4f87e8}.answer-option.correct{background:rgba(34,197,94,.10);border-color:rgba(34,197,94,.5)}.answer-option.wrong{background:rgba(239,68,68,.10);border-color:rgba(239,68,68,.5)}.answer-letter{background:var(--surface-hover);color:var(--muted-strong)}
.feedback.good{background:rgba(34,197,94,.09);border-color:rgba(34,197,94,.26)}.feedback.bad{background:rgba(239,68,68,.09);border-color:rgba(239,68,68,.26)}.formula-board,.case-step{border-color:var(--line)}.formula-token{background:var(--card-soft);border-color:var(--line);color:#86adf5}

/* Marketplace */
.marketplace-page{min-height:75vh}.marketplace-page>.marketplace-hero{max-width:var(--page-width);margin:24px auto 0}
.marketplace-hero{
  border-color:var(--line);border-radius:24px;padding:34px;
  background:linear-gradient(135deg,rgba(47,117,255,.12),rgba(16,31,52,.72) 48%,rgba(139,92,246,.09));box-shadow:var(--shadow-soft)
}
:root[data-theme="light"] .marketplace-hero{background:linear-gradient(135deg,#f5f9ff,#eef4ff 48%,#f8f4ff)}
.marketplace-hero h1{color:var(--ink);font-size:42px}.marketplace-hero p{color:var(--muted)}
.marketplace-hero-card{background:var(--card);border-color:var(--line)}
.marketplace-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.marketplace-card{background:var(--card);border:1px solid var(--line);border-radius:17px;box-shadow:var(--shadow-soft);overflow:hidden}.marketplace-card:hover{transform:translateY(-3px);border-color:var(--line-strong);box-shadow:var(--shadow)}
.marketplace-cover{min-height:150px;background:
  radial-gradient(circle at 80% 10%,rgba(34,211,238,.25),transparent 35%),
  linear-gradient(135deg,#0b367f,#102f68 50%,#4d2d86);position:relative;overflow:hidden
}
.marketplace-cover::after{content:"";position:absolute;inset:auto -15% -55% 10%;height:150px;border-radius:50%;border:1px solid rgba(102,168,255,.36);box-shadow:0 0 70px rgba(37,99,235,.25)}
.marketplace-cover span,.marketplace-cover strong{position:relative;z-index:1}.marketplace-card-body{padding:18px}.marketplace-card p{color:var(--muted)}.marketplace-meta span{background:var(--card-soft);color:var(--muted);border:1px solid var(--line)}.marketplace-footer{border-color:var(--line)}.marketplace-footer strong,.marketplace-price{color:var(--ink)}
.marketplace-detail-hero{background:linear-gradient(145deg,var(--card),var(--card-soft));border-color:var(--line)}.marketplace-buy-card{background:var(--card);border-color:var(--line)}

/* Pricing */
.pricing-grid{gap:16px}.price-card{background:var(--card);border-color:var(--line);box-shadow:var(--shadow-soft);border-radius:18px}.price-card.featured{border-color:rgba(47,117,255,.55);box-shadow:0 22px 56px rgba(37,99,235,.18);transform:translateY(-4px)}.price-card .price{color:var(--ink);font-size:35px}.price-card ul{color:var(--muted-strong)}

/* Public footer */
.public-footer-v6{margin-top:70px;border-top:1px solid var(--line);background:#06101d;color:#9fb0c8;padding:50px max(24px,calc((100vw - var(--page-width))/2)) 22px;display:grid;grid-template-columns:1fr 1.6fr;gap:46px}
:root[data-theme="light"] .public-footer-v6{background:#0a1728;color:#a9b8cc}.footer-brand-v6 p{max-width:360px;font-size:13px}.footer-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.footer-columns>div{display:grid;gap:9px;align-content:start}.footer-columns strong{color:#eef5ff;font-size:13px}.footer-columns a{font-size:12.5px}.footer-columns a:hover{color:#fff}.footer-bottom-v6{grid-column:1/-1;padding-top:18px;border-top:1px solid rgba(156,180,218,.13);display:flex;justify-content:space-between;font-size:11px}

/* Commercial landing */
.commercial-hero-v6{position:relative;min-height:720px;overflow:hidden;border-bottom:1px solid var(--line)}
.commercial-hero-v6::before{content:"";position:absolute;inset:0;background:url("brand/studiai-wave.svg") center bottom/cover no-repeat;opacity:var(--hero-grid-opacity);pointer-events:none}
.commercial-hero-v6::after{content:"";position:absolute;width:650px;height:650px;border-radius:50%;right:-160px;top:-250px;background:radial-gradient(circle,rgba(47,117,255,.25),transparent 67%);filter:blur(12px);pointer-events:none}
.commercial-hero-inner{max-width:var(--page-width);margin:auto;padding:78px 24px 72px;display:grid;grid-template-columns:minmax(0,1fr) minmax(480px,.86fr);gap:54px;align-items:center;position:relative;z-index:1}
.hero-kicker-v6{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;border:1px solid rgba(96,165,250,.24);border-radius:999px;background:rgba(47,117,255,.09);color:#82afff;font-size:11px;font-weight:820;letter-spacing:.04em}
.hero-kicker-v6 .ui-icon{width:15px;height:15px}
.commercial-hero-copy-v6 h1{max-width:760px;margin:18px 0;font-size:64px;line-height:1.01;letter-spacing:-2.8px;color:var(--ink)}
.commercial-hero-copy-v6 h1 em{font-style:normal;background:linear-gradient(90deg,#57a0ff,#22d3ee);-webkit-background-clip:text;background-clip:text;color:transparent}
.commercial-hero-copy-v6>p{max-width:690px;font-size:18px;color:var(--muted-strong);line-height:1.65}
.hero-actions-v6{display:flex;gap:11px;flex-wrap:wrap;margin-top:27px}.hero-trust-v6{display:flex;gap:20px;flex-wrap:wrap;margin-top:28px;color:var(--muted);font-size:12px}.hero-trust-v6 span{display:inline-flex;align-items:center;gap:7px}.hero-trust-v6 .ui-icon{width:16px;height:16px;color:#5de087}
.hero-product-v6{position:relative;min-height:540px;display:grid;place-items:center}
.product-window-v6{width:min(100%,580px);border:1px solid rgba(118,154,214,.24);border-radius:24px;background:linear-gradient(145deg,rgba(17,37,64,.96),rgba(7,18,33,.98));box-shadow:0 40px 100px rgba(0,0,0,.40),0 0 80px rgba(37,99,235,.12);overflow:hidden;transform:perspective(1200px) rotateY(-4deg) rotateX(1deg)}
:root[data-theme="light"] .product-window-v6{background:linear-gradient(145deg,#fff,#f7faff);box-shadow:0 35px 80px rgba(20,50,95,.16)}
.product-window-bar{height:48px;display:flex;align-items:center;gap:7px;padding:0 16px;border-bottom:1px solid var(--line)}.product-window-bar i{width:8px;height:8px;border-radius:50%;background:#53647d}.product-window-bar strong{margin-left:8px;font-size:11px;color:var(--muted)}
.product-window-body{display:grid;grid-template-columns:135px 1fr;min-height:390px}.product-mini-nav{padding:15px;border-right:1px solid var(--line);display:grid;align-content:start;gap:7px}.product-mini-nav span{height:31px;border-radius:8px;background:rgba(120,150,195,.07)}.product-mini-nav span:first-child{background:linear-gradient(90deg,#2f75ff,#1d5dd6)}
.product-mini-main{padding:18px}.product-greeting{font-size:18px;color:var(--ink);font-weight:820;margin-bottom:15px}.product-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.product-stat{padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--card-soft)}.product-stat small{display:block;color:var(--muted);font-size:9px}.product-stat strong{font-size:19px;color:var(--ink)}
.product-course-row{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:13px}.product-course{padding:13px;border:1px solid var(--line);border-radius:12px;background:var(--card-soft)}.product-course b{font-size:11px;color:var(--ink)}.product-course small{display:block;color:var(--muted);font-size:9px;margin-top:4px}.product-course .progress{margin-top:11px}
.product-login-v6{position:absolute;right:-12px;bottom:2px;width:275px;padding:18px;border:1px solid rgba(111,153,222,.26);border-radius:18px;background:color-mix(in srgb,var(--glass) 94%,transparent);box-shadow:0 24px 65px rgba(0,0,0,.34);backdrop-filter:blur(18px)}.product-login-v6 h2{font-size:18px;margin:6px 0 3px;color:var(--ink)}.product-login-v6 p{font-size:11px;margin:0 0 12px;color:var(--muted)}.product-login-v6 .field{margin-bottom:9px}.product-login-v6 .field label{font-size:10px}.product-login-v6 .field input{padding:9px 10px;font-size:11px}.product-login-v6 .btn{min-height:36px;font-size:11px}.product-login-links{display:flex;justify-content:space-between;margin-top:10px;font-size:9px;color:#7ca6ed}
.commercial-proof-v6{max-width:var(--page-width);margin:-26px auto 0;padding:0 24px;position:relative;z-index:3}.proof-grid-v6{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:17px;background:var(--glass);backdrop-filter:blur(16px);box-shadow:var(--shadow-soft);overflow:hidden}.proof-item-v6{padding:18px;display:flex;align-items:center;gap:11px;border-right:1px solid var(--line)}.proof-item-v6:last-child{border:0}.proof-item-v6 .ui-icon{color:#70a5ff}.proof-item-v6 strong{display:block;color:var(--ink);font-size:12px}.proof-item-v6 small{display:block;color:var(--muted);font-size:10px;margin-top:2px}
.commercial-section-v6{max-width:var(--page-width);margin:auto;padding:90px 24px}.commercial-section-head-v6{max-width:780px;margin:0 auto 38px;text-align:center}.commercial-section-head-v6 h2{font-size:42px;line-height:1.1;margin:9px 0 13px;color:var(--ink);letter-spacing:-1.35px}.commercial-section-head-v6 p{color:var(--muted);font-size:16px}
.feature-grid-v6{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.feature-card-v6{padding:24px;border:1px solid var(--line);border-radius:19px;background:linear-gradient(145deg,var(--card),var(--card-soft));box-shadow:var(--shadow-soft);position:relative;overflow:hidden}.feature-card-v6::before{content:"";position:absolute;width:170px;height:170px;border-radius:50%;right:-95px;top:-105px;background:radial-gradient(circle,rgba(47,117,255,.16),transparent 70%)}.feature-icon-v6{width:46px;height:46px;display:grid;place-items:center;border-radius:13px;background:rgba(47,117,255,.13);color:#75a6ff;border:1px solid rgba(69,129,228,.20)}.feature-card-v6 h3{color:var(--ink);font-size:18px;margin:18px 0 8px}.feature-card-v6 p{color:var(--muted);font-size:13px;line-height:1.55}.feature-card-v6 a{display:inline-flex;align-items:center;gap:6px;color:#7ca9ff;font-size:12px;font-weight:750;margin-top:12px}
.segment-band-v6{max-width:none;padding-left:max(24px,calc((100vw - var(--page-width))/2));padding-right:max(24px,calc((100vw - var(--page-width))/2));background:linear-gradient(180deg,rgba(12,29,50,.72),rgba(7,17,31,.82));border-block:1px solid var(--line)}:root[data-theme="light"] .segment-band-v6{background:#fff}
.segment-grid-v6{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.segment-card-v6{padding:22px;border:1px solid var(--line);border-radius:17px;background:var(--card);box-shadow:var(--shadow-soft)}.segment-card-v6 h3{color:var(--ink);margin:14px 0 7px}.segment-card-v6 p{color:var(--muted);font-size:12.5px}.segment-card-v6 .feature-icon-v6{width:42px;height:42px}
.cta-v6{margin:25px auto 0;max-width:var(--page-width);padding:45px;border:1px solid rgba(70,131,235,.28);border-radius:25px;background:linear-gradient(135deg,rgba(47,117,255,.18),rgba(18,42,74,.75) 45%,rgba(34,211,238,.08));display:flex;align-items:center;justify-content:space-between;gap:30px;box-shadow:var(--shadow)}.cta-v6 h2{font-size:34px;margin:0 0 8px;color:var(--ink)}.cta-v6 p{color:var(--muted);margin:0;max-width:720px}.cta-actions-v6{display:flex;gap:9px;flex-wrap:wrap}

/* Dashboard 6 */
.dashboard-page-v6{max-width:var(--page-width);padding-top:24px}
.dashboard-hero-v6{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.55fr);gap:16px;margin-bottom:16px}
.dashboard-welcome-v6{position:relative;overflow:hidden;padding:27px;border:1px solid var(--line);border-radius:20px;background:linear-gradient(135deg,rgba(47,117,255,.16),rgba(14,31,53,.82) 48%,rgba(34,211,238,.06));box-shadow:var(--shadow-soft)}
:root[data-theme="light"] .dashboard-welcome-v6{background:linear-gradient(135deg,#f4f8ff,#fff 55%,#f0fbff)}
.dashboard-welcome-v6::after{content:"";position:absolute;inset:auto -5% -55% 20%;height:230px;background:url("brand/studiai-wave.svg") center/cover no-repeat;opacity:.35}.dashboard-welcome-v6>*{position:relative;z-index:1}.dashboard-welcome-v6 h1{font-size:30px;letter-spacing:-.8px;margin:7px 0;color:var(--ink)}.dashboard-welcome-v6 p{max-width:680px;color:var(--muted);margin:0}.dashboard-welcome-actions{display:flex;gap:9px;margin-top:21px;flex-wrap:wrap}
.dashboard-focus-v6{padding:22px;border:1px solid var(--line);border-radius:20px;background:var(--card);box-shadow:var(--shadow-soft);display:grid;grid-template-columns:auto 1fr;align-items:center;gap:18px}.focus-ring-v6{--value:0;width:105px;height:105px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--cyan) calc(var(--value)*1%),rgba(126,153,195,.14) 0);position:relative}.focus-ring-v6::after{content:"";position:absolute;inset:9px;border-radius:50%;background:var(--card)}.focus-ring-v6 strong{position:relative;z-index:1;color:var(--ink);font-size:22px}.dashboard-focus-v6 small{color:var(--muted)}.dashboard-focus-v6 h3{margin:5px 0;color:var(--ink)}
.dashboard-stats-v6{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
.dashboard-layout-v6{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:16px;margin-top:16px}.dashboard-main-v6,.dashboard-rail-v6{min-width:0}.dashboard-rail-v6{display:grid;align-content:start;gap:16px}.rail-card-v6{padding:19px;border:1px solid var(--line);border-radius:17px;background:var(--card);box-shadow:var(--shadow-soft)}.rail-card-v6 h3{font-size:16px;margin:0;color:var(--ink)}.rail-card-v6 p{font-size:12px;color:var(--muted)}.quick-actions-v6{display:grid;grid-template-columns:1fr 1fr;gap:9px}.quick-action-v6{padding:13px;border:1px solid var(--line);border-radius:12px;background:var(--card-soft);display:flex;align-items:center;gap:9px;color:var(--muted-strong);font-size:11px;font-weight:720}.quick-action-v6:hover{background:var(--surface-hover);color:var(--ink);border-color:var(--line-strong)}.quick-action-v6 .ui-icon{color:#75a6ff;width:17px;height:17px}.rail-list-v6{display:grid;gap:9px;margin-top:13px}.rail-list-item-v6{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px;border:1px solid var(--line);border-radius:11px;background:var(--card-soft)}.rail-list-item-v6 strong{font-size:11px;color:var(--ink)}.rail-list-item-v6 small{font-size:9px;color:var(--muted);display:block}.rail-list-item-v6 span:last-child{font-size:11px;color:#7ca7f5;font-weight:800}

/* Responsive */
@media(max-width:1280px){
  :root{--sidebar-width:240px}.app-nav-link{padding:9px 10px;font-size:13px}.sidebar-brand-row{padding:0 15px}.stats-grid,.dashboard-stats-v6{grid-template-columns:repeat(3,1fr)}
  .commercial-hero-inner{grid-template-columns:minmax(0,1fr) 460px}.commercial-hero-copy-v6 h1{font-size:54px}.feature-grid-v6{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:1050px){
  .app-shell-v6{display:block}.app-main-v6{grid-column:auto}.app-sidebar-v6{transform:translateX(-105%);transition:transform .25s ease;width:min(300px,88vw)}.app-sidebar-v6.open{transform:translateX(0)}.sidebar-close{display:grid;place-items:center}.app-overlay{display:block;position:fixed;inset:0;z-index:65;background:rgba(0,0,0,.48);opacity:0;visibility:hidden;transition:.2s}.app-overlay.open{opacity:1;visibility:visible}.nav-open{overflow:hidden}.app-menu-button{display:grid;place-items:center}.app-header-v6{padding:0 18px}
  .commercial-hero-inner{grid-template-columns:1fr;padding-top:55px}.hero-product-v6{min-height:520px}.commercial-hero-v6{min-height:auto}.proof-grid-v6{grid-template-columns:repeat(2,1fr)}.proof-item-v6:nth-child(2){border-right:0}.proof-item-v6:nth-child(-n+2){border-bottom:1px solid var(--line)}.segment-grid-v6{grid-template-columns:repeat(2,1fr)}
  .dashboard-hero-v6{grid-template-columns:1fr}.dashboard-layout-v6{grid-template-columns:1fr}.dashboard-rail-v6{grid-template-columns:repeat(2,1fr)}
  .marketplace-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:820px){
  .public-header-inner{height:68px;padding:0 14px;gap:10px}.public-header-v6 .brand small{display:none}.public-header-v6 .brand strong{font-size:16px}.public-header-v6 .brand img{width:36px;height:36px}.public-header-v6 .nav-menu-button{display:grid;place-items:center;margin-left:auto}.public-nav-v6{position:absolute;top:68px;left:12px;right:12px;display:none;flex-direction:column;align-items:stretch;padding:10px;border:1px solid var(--line);border-radius:15px;background:var(--glass);box-shadow:var(--shadow);backdrop-filter:blur(18px)}.public-nav-v6.open{display:flex}.public-nav-v6 a{padding:12px}.public-actions-v6{margin-left:0}.public-actions-v6 .theme-toggle-label,.app-header-actions .theme-toggle-label{display:none}.public-actions-v6 .public-register-button{display:none}.public-actions-v6 .btn{padding:8px 11px;min-height:39px;font-size:12px}
  .commercial-hero-inner{padding:38px 15px 55px}.commercial-hero-copy-v6 h1{font-size:43px;letter-spacing:-1.8px}.commercial-hero-copy-v6>p{font-size:16px}.hero-product-v6{min-height:480px}.product-window-v6{transform:none}.product-login-v6{right:8px}.commercial-proof-v6{padding:0 15px}.commercial-section-v6{padding:65px 15px}.commercial-section-head-v6 h2{font-size:34px}.feature-grid-v6{grid-template-columns:1fr}.cta-v6{margin-inline:12px;padding:30px;display:block}.cta-actions-v6{margin-top:20px}
  .page{padding:22px 15px 58px}.page-head{display:block}.page-head>div:last-child{margin-top:15px}.page-head h1{font-size:28px}.stats-grid,.dashboard-stats-v6{grid-template-columns:repeat(2,1fr)}.subject-list{grid-template-columns:1fr}.grid-3,.grid-4{grid-template-columns:1fr 1fr}.admin-shell{grid-template-columns:1fr}.admin-side{position:static}.dashboard-rail-v6{grid-template-columns:1fr 1fr}.marketplace-grid{grid-template-columns:1fr 1fr}.public-footer-v6{grid-template-columns:1fr;padding:40px 20px 20px}.footer-columns{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:620px){
  .app-header-v6{height:64px;padding:0 12px}.app-header-title .eyebrow{display:none}.app-header-title strong{font-size:13px}.header-action span{display:none}.header-action{width:38px;padding:8px;justify-content:center}.app-header-actions{gap:5px}.theme-toggle{width:38px;padding:8px}.header-avatar{width:36px;height:36px}.page{padding-inline:12px}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.stats-grid,.dashboard-stats-v6{grid-template-columns:1fr 1fr}.stat-card{padding:13px}.stat-icon{width:36px;height:36px}.stat-card strong{font-size:19px}.dashboard-welcome-v6{padding:20px}.dashboard-welcome-v6 h1{font-size:25px}.dashboard-focus-v6{grid-template-columns:85px 1fr}.focus-ring-v6{width:82px;height:82px}.dashboard-layout-v6{gap:12px}.dashboard-rail-v6{grid-template-columns:1fr}.quick-actions-v6{grid-template-columns:1fr 1fr}
  .commercial-hero-inner{display:flex;flex-direction:column;align-items:stretch;gap:28px}.commercial-hero-copy-v6 h1{font-size:36px}.hero-actions-v6{display:grid}.hero-product-v6{min-height:500px}.product-window-body{grid-template-columns:88px 1fr}.product-mini-nav{padding:10px}.product-mini-main{padding:12px}.product-stats{grid-template-columns:1fr 1fr}.product-stat:last-child{display:none}.product-course-row{grid-template-columns:1fr}.product-course:last-child{display:none}.product-login-v6{left:12px;right:12px;width:auto;bottom:-4px}.proof-grid-v6{grid-template-columns:1fr}.proof-item-v6{border-right:0;border-bottom:1px solid var(--line)!important}.proof-item-v6:last-child{border-bottom:0!important}.segment-grid-v6{grid-template-columns:1fr}.marketplace-grid{grid-template-columns:1fr}.marketplace-hero{padding:22px}.marketplace-hero h1{font-size:32px}.price-card.featured{transform:none}.footer-columns{grid-template-columns:1fr 1fr}.footer-bottom-v6{display:grid;gap:6px}
  .auth-shell{display:block;padding:16px 12px}.auth-promo{min-height:auto;padding:28px;margin-bottom:12px}.auth-promo h1{font-size:34px}.auth-card{padding:22px}.question-card{padding:19px}.question-card h1{font-size:22px}
}
@media(max-width:410px){.stats-grid,.dashboard-stats-v6{grid-template-columns:1fr}.quick-actions-v6{grid-template-columns:1fr}.footer-columns{grid-template-columns:1fr}.theme-toggle-label{display:none}}

@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}


/* StudiAI 6.1.1 – Login, Profil und Admin polish */
.password-input-wrap{position:relative;display:block}
.password-input-wrap input{min-height:56px;padding-right:136px}
.password-toggle{min-width:108px;display:inline-flex;align-items:center;justify-content:center}
.auth-card .field input,.auth-card .field select,.auth-card .field textarea{min-height:56px;font-size:16px}
.auth-card .checkbox.field,.checkbox-card{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:14px;padding:10px 0;margin:6px 0 2px}
.auth-card .checkbox.field input,.checkbox-card input{width:20px;height:20px;margin:0}
.auth-card .checkbox.field span,.checkbox-card span{display:block;line-height:1.45}
.auth-help-links{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.auth-help-links a{display:inline-flex}
.auth-recovery-link{padding-top:14px;border-top:1px solid var(--line)}
.profile-form-grid .form-row{margin-bottom:0}
.profile-form-grid .checkbox-card{padding:14px 15px;border:1px solid var(--line);border-radius:14px;background:var(--card-soft)}

.admin-page{max-width:var(--page-width)}
.admin-page .page-head{align-items:flex-start;gap:14px;margin-bottom:22px}
.admin-page .page-head>div{max-width:840px}
.admin-page .page-head .pill{margin-top:8px}
.admin-page .admin-shell{grid-template-columns:260px minmax(0,1fr);gap:20px;align-items:start}
.admin-page .admin-tabs{position:sticky;top:92px;padding:12px;border:1px solid var(--line);border-radius:20px;background:linear-gradient(180deg,color-mix(in srgb,var(--card) 96%,#fff 4%),var(--card));box-shadow:var(--shadow-soft);display:grid;gap:6px}
.admin-page .admin-tabs a{display:flex;align-items:center;min-height:44px;padding:11px 14px;border-radius:12px;color:var(--muted-strong);font-weight:780;line-height:1.3}
.admin-page .admin-tabs a:hover{background:var(--surface-hover);color:var(--ink)}
.admin-page .admin-tabs a.active{background:linear-gradient(135deg,rgba(47,117,255,.98),rgba(28,91,213,.92));color:#fff;box-shadow:0 10px 24px rgba(37,99,235,.24)}
.admin-page .admin-content{display:grid;gap:18px}
.admin-page .admin-content>.section,.admin-page .admin-content>.card{margin-top:0}
.launch-health-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.launch-health-card{display:grid;gap:7px;padding:19px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,color-mix(in srgb,var(--card) 97%,#fff 3%),var(--card));box-shadow:var(--shadow-soft);color:var(--text);position:relative;overflow:hidden}
.launch-health-card::before{content:'';position:absolute;inset:0 auto 0 0;width:4px;background:rgba(125,151,191,.25)}
.launch-health-card span{font-size:11px;text-transform:uppercase;letter-spacing:.08em;font-weight:820;color:var(--muted)}
.launch-health-card strong{font-size:18px;line-height:1.25;color:var(--ink)}
.launch-health-card small{color:var(--muted);line-height:1.45}
.launch-health-card.is-good::before{background:linear-gradient(180deg,var(--green),#7ee8aa)}
.launch-health-card.is-warn::before{background:linear-gradient(180deg,var(--orange),#ffd071)}
.launch-health-card.is-bad::before{background:linear-gradient(180deg,var(--red),#ff9f9f)}
.admin-page .search-form input{min-height:42px;background:var(--card-soft);border:1px solid var(--line);border-radius:12px;color:var(--text)}
.admin-page .inline-form select,.admin-page .search-form button,.admin-page details summary.btn{min-height:38px}
.admin-page .inline-form select{background:var(--card-soft);border:1px solid var(--line);border-radius:10px;color:var(--text);padding:8px 10px}
.admin-page details>summary{list-style:none}
.admin-page details>summary::-webkit-details-marker{display:none}
.admin-page code{background:var(--card-soft);padding:3px 6px;border-radius:8px}
.admin-page .table-wrap,.admin-page .card{width:100%}
.admin-page .section-title{margin-bottom:0}
.admin-page .section-title + .card.section,.admin-page .section-title + .table-wrap{margin-top:0}

@media(max-width:1100px){
  .admin-page .admin-shell{grid-template-columns:1fr}
  .admin-page .admin-tabs{position:static;display:flex;overflow:auto;padding:8px}
  .admin-page .admin-tabs a{white-space:nowrap;flex:0 0 auto}
  .launch-health-grid{grid-template-columns:1fr}
}
@media(max-width:820px){
  .auth-help-links{display:grid}
}
@media(max-width:620px){
  .password-input-wrap input{padding-right:118px}
  .password-toggle{min-width:96px;padding-inline:10px}
  .admin-page .page-head{display:block}
  .admin-page .page-head .pill{display:inline-flex;margin-top:12px}
}