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12px;border-radius:10px;background:var(--accent-soft);color:#8d6900;font-size:14px}.muted-link{margin-top:20px;text-align:center;font-size:14px;color:var(--muted)}.muted-link a{color:var(--teal);font-weight:700}.text-back{display:inline-block;margin-top:14px;padding:0;border:0;background:none;color:var(--muted);font-size:13px;font-weight:700;cursor:pointer}.text-back:hover{color:var(--teal)}.role-grid{display:grid;gap:12px;margin-top:28px}.role-card{display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;gap:6px 14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px 16px;box-shadow:var(--shadow);transition:border-color .15s ease,transform .15s ease,box-shadow .15s ease}.role-card:hover,.role-card:focus-visible{border-color:var(--teal);transform:translateY(-2px);box-shadow:0 16px 40px #0b8a8324;outline:none}.role-icon{grid-row:1 / span 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16px}.app-shell{width:min(28rem,100%);margin-inline:auto;min-height:100vh;padding-bottom:6rem;background:transparent}@media(min-width:901px){.app-shell{width:min(32rem,100%);max-width:520px;border-inline:1px solid var(--line);background:#ffffffb3;box-shadow:0 0 0 1px #102f4405}html.site-desktop .app-shell{width:min(1200px,calc(100% - 48px));max-width:none;border-inline:none;background:transparent;box-shadow:none;padding-bottom:2rem}html.site-desktop .app-main{padding:32px 0}.auth-page{padding-top:48px}}.app-header{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;background:#fffffff2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.app-main{padding:24px 20px}.wallet-pill{border-radius:999px;background:var(--accent-soft);color:#8d6900;padding:8px 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var(--line);background:#fffffff5;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.header-start,.header-end{display:flex;align-items:center;gap:8px}.header-end{justify-content:flex-end}.header-center{min-width:0;text-align:center;padding:0 4px}.header-title{margin:0;font-family:var(--font-display-stack);font-size:.95rem;font-weight:800;color:var(--navy);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-title-muted{color:var(--muted);font-weight:700}.header-back{display:inline-flex;align-items:center;gap:2px;min-height:40px;min-width:40px;padding:0 10px 0 6px;margin:0;border:0;border-radius:999px;background:var(--mint);color:var(--teal);font:inherit;font-size:13px;font-weight:700;cursor:pointer;-webkit-tap-highlight-color:transparent}.header-back:active{transform:scale(.97)}.header-back-inline{background:#fff;border:1px solid var(--line);color:var(--navy)}.header-brand{display:grid;place-items:center;width:40px;height:40px}.brand-mark-sm{width:34px;height:34px;display:grid;place-items:center;background:var(--navy);color:#fff;border-radius:11px;font-family:var(--font-display-stack);font-weight:800;font-size:15px}.wallet-pill-compact{display:inline-flex;align-items:center;gap:4px;padding:8px 11px;font-size:12px}.app-header-right{display:flex;align-items:center;gap:8px}.header-page-title{margin-top:4px}.profile-chip{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:50%;background:linear-gradient(145deg,var(--navy),#1a4a66);color:#fff;box-shadow:0 8px 20px #102f442e;border:2px solid #fff;flex-shrink:0}.profile-chip-avatar{font-family:var(--font-display-stack);font-weight:800;font-size:15px;line-height:1}.wallet-pill{display:inline-flex;align-items:center;gap:4px;padding:8px 12px;border-radius:999px;background:var(--accent-soft);color:#7a5a00;font-size:12px;font-weight:800;border:1px solid #f0dfa0}.back-link-btn{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line)}.bottom-nav{position:fixed;left:50%;bottom:0;transform:translate(-50%);width:min(28rem,100%);display:grid;grid-template-columns:repeat(5,1fr);gap:4px;padding:10px 10px calc(10px + env(safe-area-inset-bottom));background:#fffffff7;border-top:1px solid var(--line);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);z-index:30;box-shadow:0 -8px 30px #102f440f}.bn-item{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center;font-size:10px;font-weight:700;color:var(--muted);padding:6px 2px;border-radius:14px}.bn-icon{display:grid;place-items:center;width:38px;height:38px;border-radius:13px;color:var(--muted)}.bn-item.on .bn-icon{background:var(--mint);color:var(--teal)}@media(max-width:380px){.header-back-label{display:none}.header-back{padding:0;width:40px;justify-content:center}}@media(min-width:901px){.bottom-nav{width:min(32rem,100%);max-width:520px}html.site-desktop .bottom-nav{position:sticky;left:auto;transform:none;width:100%;max-width:none;margin-top:auto;border-top:1px solid var(--line);border-radius:16px 16px 0 0;padding:12px 24px calc(12px + env(safe-area-inset-bottom));box-shadow:0 -4px 24px #102f440a}html.site-desktop .student-shell{padding-bottom:0;min-height:100vh;display:flex;flex-direction:column}html.site-desktop .student-shell-home{padding-bottom:0}html.site-desktop .app-header-bar{padding-inline:0;border-radius:16px;margin-bottom:8px;border:1px solid var(--line)}.bn-icon{width:42px;height:42px}.bn-label{font-size:11px}.welcome-sheet{border-radius:32px;margin-bottom:24px}.home-hero{border-radius:28px}html.site-desktop .home-screen{padding:0}html.site-desktop .home-hero{border-radius:28px;padding:32px 40px 40px}html.site-desktop .home-hero-inner{max-width:100%}html.site-desktop .home-pillars{padding:32px 0 16px}html.site-desktop .home-pillar-grid{grid-template-columns:repeat(4,1fr);gap:16px}html.site-desktop .home-pillar-grid .pillar-card-rich{grid-template-columns:1fr;justify-items:center;text-align:center;padding:24px 16px;border-radius:24px;border-left:none!important;min-height:160px;gap:12px}html.site-desktop .home-pillar-grid .pillar-icon{margin:0 auto}html.site-desktop .home-pillar-grid .row-chevron{display:none}html.site-desktop .home-title{font-size:2.4rem}html.site-desktop .home-motivation{font-size:17px;max-width:48ch}}.home-screen{min-height:100%}.home-hero{position:relative;padding:calc(16px + env(safe-area-inset-top,0px)) 20px 36px;color:#fff;overflow:hidden;border-radius:0 0 32px 32px}.home-hero-inner{position:relative;z-index:1}.home-hero-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.home-icon-btn{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:#ffffff24;border:1px solid rgba(255,255,255,.25);color:#fff}.header-settings-btn{background:var(--mint);border:1px solid #cfe9e4;color:var(--teal);flex-shrink:0}.header-settings-btn:active{transform:scale(.97)}.home-wallet{display:inline-flex;align-items:center;gap:6px;padding:10px 14px;border-radius:999px;background:#ffffff29;border:1px solid rgba(255,255,255,.28);color:#fff;font-size:13px;font-weight:800;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.home-motivation{margin:10px 0 0;font-size:15px;line-height:1.55;font-weight:500;opacity:.95;max-width:34ch}.home-hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 85% 15%,rgba(201,243,107,.35),transparent 45%),radial-gradient(circle at 10% 90%,rgba(255,212,90,.2),transparent 40%),linear-gradient(145deg,#0f3348,#0b8a83)}.home-hero-content{position:relative;z-index:1}.home-eyebrow{margin:0 0 8px;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;opacity:.85}.home-title{margin:0;font-family:var(--font-display-stack);font-size:clamp(1.65rem,6vw,2rem);line-height:1.15;letter-spacing:-.03em}.home-lead{margin:10px 0 0;font-size:14px;line-height:1.5;opacity:.92;max-width:28ch}.grade-badge{display:inline-flex;align-items:center;gap:10px;margin-top:18px;padding:8px 14px 8px 8px;border-radius:999px;background:#ffffff2e;border:1px solid rgba(255,255,255,.32);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 8px 24px #00000014}.grade-badge-icon{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#fffffff2;color:var(--teal);flex-shrink:0}.grade-badge-body{display:grid;gap:1px;line-height:1.2}.grade-badge-level{font-family:var(--font-display-stack);font-size:15px;font-weight:800;letter-spacing:-.02em}.grade-badge-series{font-size:11px;font-weight:600;opacity:.88;letter-spacing:.02em;text-transform:uppercase}.home-pillars{padding:24px 16px 32px}.home-section-label{margin:0 0 14px;font-size:13px;font-weight:700;color:var(--muted);letter-spacing:.04em;text-transform:uppercase}.home-pillar-grid{margin-top:0}@media(max-width:900px){html.pwa-mobile .home-pillar-grid,.home-pillar-grid{grid-template-columns:repeat(2,1fr);gap:12px}html.pwa-mobile .home-pillar-grid .pillar-card-rich,.home-pillar-grid .pillar-card-rich{grid-template-columns:1fr;grid-template-rows:auto auto;justify-items:center;text-align:center;padding:18px 12px 16px;border-radius:24px;border-left:none!important;min-height:130px;gap:10px}html.pwa-mobile .home-pillar-grid .pillar-icon,.home-pillar-grid .pillar-icon{width:48px;height:48px;border-radius:16px;margin:0 auto}html.pwa-mobile .home-pillar-grid .row-chevron,.home-pillar-grid .row-chevron{display:none}html.pwa-mobile .home-pillar-grid .pillar-copy span,.home-pillar-grid .pillar-copy span{font-size:11px;line-height:1.35}html.pwa-mobile .home-pillar-grid .pillar-card strong,.home-pillar-grid .pillar-card strong{font-size:.95rem}}.pillar-grid{display:grid;gap:12px;margin-top:22px}.pillar-card{display:grid;gap:6px;text-align:left;padding:18px 16px;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:0 12px 32px #102f4412;cursor:pointer;font:inherit;color:inherit;text-decoration:none;transition:transform .15s ease,box-shadow .15s ease}.pillar-card:active{transform:scale(.985)}.pillar-card-rich{grid-template-columns:auto 1fr auto;align-items:center;gap:14px;padding:16px}.pillar-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:18px;flex-shrink:0}.pillar-icon.tone-math{background:#e7f5f1;color:#0b8a83}.pillar-icon.tone-pc{background:#fff4e8;color:#a66e06}.pillar-icon.tone-svt{background:#eef3fb;color:#426ca6}.pillar-icon.tone-duel{background:#fff8e8;color:#d97706}.pillar-copy{display:grid;gap:4px;min-width:0}.pillar-card strong{font-family:var(--font-display-stack);font-size:1.05rem;color:var(--navy)}.pillar-card span{font-size:13px;color:var(--muted);line-height:1.45}.pillar-chevron{font-size:1.5rem;color:var(--line);font-weight:300;line-height:1}.tone-math.pillar-card-rich{border-left:4px solid #0b8a83}.tone-pc.pillar-card-rich{border-left:4px solid #a66e06}.tone-svt.pillar-card-rich{border-left:4px solid #426ca6}.tone-duel.pillar-card-rich{border-left:4px solid #f59e0b}.settings-page{display:grid;gap:16px}.settings-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px 16px;box-shadow:0 10px 28px #102f440d}.settings-actions{display:grid;gap:10px}.settings-feedback{margin:0}.settings-danger-zone{border-color:#fecaca;background:linear-gradient(180deg,snow,#fff);box-shadow:0 10px 28px #dc26260f}.danger-zone-header{display:flex;gap:12px;align-items:flex-start;margin-bottom:16px}.danger-zone-icon{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:#fef2f2;border:1px solid #fecaca;color:var(--danger);font-family:var(--font-display-stack);font-weight:800;font-size:18px;flex-shrink:0}.danger-zone-title{margin:0;font-family:var(--font-display-stack);font-size:1rem;font-weight:800;color:var(--danger)}.danger-zone-desc{margin:6px 0 0;font-size:13px;color:#7f1d1d;line-height:1.5}.app-modal-root{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:grid;place-items:center;padding:20px;background:#102f4473;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);animation:modal-fade-in .18s ease}@keyframes modal-fade-in{0%{opacity:0}to{opacity:1}}.app-modal{width:min(420px,100%);max-height:min(90vh,640px);overflow:auto;background:#fff;border-radius:22px;border:1px solid var(--line);box-shadow:0 24px 64px #102f442e;animation:modal-slide-up .22s ease;outline:none}.app-modal-danger{border-color:#fecaca}@keyframes modal-slide-up{0%{opacity:0;transform:translateY(12px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.app-modal-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:18px 18px 0}.app-modal-title{margin:0;font-family:var(--font-display-stack);font-size:1.1rem;font-weight:800;color:var(--navy);line-height:1.3}.app-modal-danger .app-modal-title{color:var(--danger)}.app-modal-close{display:grid;place-items:center;width:32px;height:32px;margin:0;padding:0;border:0;border-radius:50%;background:var(--mint);color:var(--teal);font-size:22px;line-height:1;cursor:pointer;flex-shrink:0}.app-modal-body{padding:14px 18px 18px}.app-modal-actions{display:flex;gap:10px;margin-top:18px}.app-modal-actions .btn{flex:1}.delete-modal-lead{margin:0;font-size:14px;line-height:1.55;color:var(--ink)}.delete-modal-list{margin:12px 0 16px;padding-left:18px;font-size:13px;line-height:1.55;color:#7f1d1d}.delete-modal-input{border-color:#fecaca}.delete-modal-input:focus{border-color:var(--danger);box-shadow:0 0 0 3px #dc26261f}.delete-modal-form{display:grid;gap:0}.welcome-screen{min-height:100vh;min-height:100dvh;display:grid;align-items:end;position:relative;background:var(--navy)}.welcome-screen-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 20% 20%,rgba(11,138,131,.45),transparent 50%),radial-gradient(circle at 80% 30%,rgba(255,212,90,.25),transparent 45%),linear-gradient(180deg,#102f44,#0b8a83 55%,#08706a)}.welcome-sheet{position:relative;z-index:1;width:100%;max-width:32rem;margin:0 auto;padding:32px 24px calc(28px + env(safe-area-inset-bottom));background:#fff;border-radius:32px 32px 0 0;text-align:center;box-shadow:0 -20px 60px #0000001f}.welcome-badge{width:72px;height:72px;margin:0 auto 16px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,var(--mint),#fff);color:var(--teal);font-size:2rem;font-weight:800;border:3px solid var(--mint)}.welcome-eyebrow{margin:0;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--teal)}.welcome-title{margin:8px 0 0;font-family:var(--font-display-stack);font-size:clamp(1.75rem,6vw,2.1rem);color:var(--navy);letter-spacing:-.03em}.welcome-lead{margin:12px 0 0;color:var(--muted);font-size:15px;line-height:1.55}.welcome-gift-rich{display:flex;align-items:center;gap:14px;margin-top:22px;padding:16px;border-radius:18px;background:var(--accent-soft);border:1px solid #f0dfa0;text-align:left}.welcome-gift-icon{font-size:1.75rem;line-height:1}.welcome-gift-rich strong{display:block;color:var(--navy);font-family:var(--font-display-stack)}.welcome-gift-rich span{font-size:13px;color:var(--muted)}.welcome-cta{margin-top:24px;border-radius:999px;min-height:52px;font-size:1rem}.bn-item.on{color:var(--teal)}.bn-label{line-height:1}.row-chevron{display:grid;place-items:center;color:var(--muted);flex-shrink:0}.card-row{display:flex;align-items:center;gap:12px;text-decoration:none;color:inherit}.card-row-body{flex:1;min-width:0}.action-stack{gap:12px}.action-card{display:flex;align-items:center;gap:14px;padding:16px;border-radius:20px;border:1px solid var(--line);background:#fff;box-shadow:0 10px 28px #102f440f;text-decoration:none;color:inherit}.action-card-primary{background:linear-gradient(135deg,var(--navy),#1a5575);border-color:transparent;color:#fff}.action-card-primary .action-card-copy span{color:#ffffffc7}.action-card-primary .row-chevron{color:#ffffff8c}.action-card-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:14px;background:#ffffff29;flex-shrink:0}.action-card-icon-alt{background:var(--mint);color:var(--teal)}.action-card-copy{flex:1;display:grid;gap:2px;min-width:0}.action-card-copy strong{font-family:var(--font-display-stack);font-size:.98rem}.action-card-copy span{font-size:13px;color:var(--muted)}.stat-card-icon{padding-top:4px}.stat-icon{display:grid;place-items:center;width:36px;height:36px;border-radius:12px;margin-bottom:4px}.stat-icon.tone-wallet{background:var(--accent-soft);color:#8d6900}.stat-icon.tone-sensei{background:var(--mint);color:var(--teal)}.stat-icon.tone-duel{background:#fff8e8;color:#d97706}.stat-icon.tone-activity{background:#eef3fb;color:#426ca6}.lesson-subject{margin-top:28px}.subject-label{margin:0 0 10px;font-family:var(--font-display-stack);font-size:1.05rem;display:flex;align-items:center;gap:8px}.subject-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;flex-shrink:0}.subject-icon-math{background:#e7f5f1;color:#0b8a83}.subject-icon-pc{background:#fff4e8;color:#a66e06}.subject-icon-svt{background:#eef3fb;color:#426ca6}.subject-label.math{color:#0b8a83}.subject-label.pc{color:#a66e06}.subject-label.svt{color:#426ca6}.sensei-chat{margin-top:12px;display:grid;gap:10px}.chat-thread{display:grid;gap:10px;max-height:48vh;overflow:auto;padding:4px}.chat-empty{text-align:center;padding:24px 8px}.bubble{padding:12px 14px;border-radius:16px;font-size:14px;line-height:1.55}.bubble.user{background:var(--navy);color:#fff;justify-self:end;max-width:90%}.bubble.assistant{background:#fff;border:1px solid var(--line);max-width:95%}.chat-img,.correct-hero-img,.upload-zone img{width:100%;max-height:180px;object-fit:cover;border-radius:12px;margin-bottom:8px}.chat-compose{display:grid;gap:8px}.chat-tools{display:flex;gap:8px}.chat-preview{display:grid;gap:8px}.chat-preview img{max-height:120px;border-radius:12px;object-fit:cover}.upload-zone{display:grid;place-items:center;gap:10px;min-height:180px;border:2px dashed var(--line);border-radius:18px;background:#fbfdfd;color:var(--muted);font-weight:600;cursor:pointer;overflow:hidden;text-align:center;padding:12px}.sci-markdown{font-size:14px;line-height:1.6}.sci-markdown p{margin:0 0 .6em}.sci-markdown .katex-display{margin:.6em 0;overflow-x:auto}.sci-block{margin:12px 0;padding:12px;border-radius:14px;background:var(--mint);border:1px solid #cfe9e4}.sci-block-title{margin:0 0 8px;font-weight:700;color:var(--navy)}.sci-chart{width:100%;background:#fff;border-radius:12px;padding:8px 4px}.sci-chart-labels{display:flex;flex-wrap:wrap;gap:8px 16px;margin-bottom:6px}.sci-axis-label{font-size:12px;font-weight:600;color:var(--muted)}.chem-structure{margin:8px 0;display:flex;justify-content:center;background:#fff;border-radius:12px;padding:8px}.chem-canvas{max-width:100%;height:auto;border-radius:8px}.chem-smiles-code{display:block;margin-top:6px;font-size:11px;word-break:break-all;color:var(--muted)}.chem-structure-fallback{font-size:12px;padding:8px}.sci-circuit-layout{margin:0 0 8px}.circuit-svg{width:100%;height:auto}.chem-smiles code{display:block;margin:6px 0;font-size:12px;word-break:break-all}.chem-placeholder{display:grid;place-items:center;height:88px;border-radius:12px;background:linear-gradient(135deg,#e7f5f1,#fff4c9);color:var(--navy);font-weight:800}.chem-placeholder small{font-weight:600;color:var(--muted)}.bio-svg{width:100%;height:auto}.bio-labels{margin:8px 0 0;padding-left:18px;color:var(--muted);font-size:13px}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:8px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;display:grid;gap:4px}.stat-card strong{font-family:var(--font-display-stack);font-size:1.5rem;color:var(--navy)}.stat-card span{font-size:12px;color:var(--muted);font-weight:600}.duel-score-bar{display:flex;justify-content:space-between;font-weight:700;margin-bottom:12px;color:var(--navy)}.duel-result-card{text-align:center;padding:24px 12px}