:root{
  --bg:#f5f7fb;--bg2:#eef4ff;--panel:#ffffff;--panel2:#f9fbff;--text:#1b2340;--muted:#69738a;
  --primary:#3563e9;--primary-dark:#2148b7;--soft:#e9f0ff;--soft-strong:#dbe7ff;
  --border:#e3e8f4;--success:#1a8f57;--success-bg:#ecfbf2;--danger:#c63f3f;--danger-bg:#fff1f1;
  --shadow:0 16px 40px rgba(53,99,233,.12);--shadow-soft:0 8px 24px rgba(22,32,60,.06)
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,var(--bg2) 0,#f8fbff 140px,var(--bg) 100%);color:var(--text);font-family:Inter,Arial,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}
button,select{font:inherit}button{cursor:pointer}
.site-header{position:sticky;top:0;z-index:20;padding:0;background:rgba(245,247,251,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(227,232,244,.9)}
.header-inner,.container{width:min(1120px,calc(100% - 24px));margin:0 auto}
.header-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 0}
.container{padding:18px 0 72px}
h1{font-size:clamp(26px,6vw,46px);letter-spacing:-.04em;line-height:1.2;margin:4px 0 0}
h2{font-size:clamp(22px,4.8vw,36px);margin:0;line-height:1.25}h3{margin-top:0}
.eyebrow{color:var(--primary);font-size:11px;font-weight:900;letter-spacing:.16em;margin:0}.description{color:var(--muted);line-height:1.85}
.panel{background:linear-gradient(180deg,#fff,var(--panel2));border:1px solid var(--border);border-radius:28px;padding:clamp(18px,4vw,40px);box-shadow:var(--shadow)}.hidden{display:none!important}
.section-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.question-count{padding:9px 13px;border-radius:999px;background:var(--soft);color:var(--primary);font-weight:900}
.score-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}
.score-card{position:relative;text-align:left;padding:22px;border:1px solid var(--border);border-radius:22px;background:#fff;transition:.22s;box-shadow:var(--shadow-soft)}
.score-card:hover,.score-card.active{transform:translateY(-2px);border-color:var(--primary);background:linear-gradient(180deg,#fff,var(--soft))}
.score-card strong,.score-card small,.score-range{display:block}.score-range{font-size:24px;font-weight:900;color:var(--primary)}.score-card strong{font-size:20px;margin-top:8px}.score-card small{color:var(--muted);margin-top:8px;line-height:1.5}
.settings-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:16px;background:#f8faff;border-radius:20px;border:1px solid var(--border)}
.settings-grid label{display:grid;gap:8px;font-weight:900;font-size:14px}
select{width:100%;padding:14px 16px;border:1px solid var(--border);border-radius:14px;background:#fff;color:var(--text);appearance:none;background-image:linear-gradient(45deg,transparent 50%, var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) calc(1em + 2px),calc(100% - 13px) calc(1em + 2px);background-size:5px 5px,5px 5px;background-repeat:no-repeat}
.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.button{border-radius:16px;padding:14px 18px;border:1px solid transparent;font-weight:900;min-height:50px}.button-primary{background:var(--primary);color:#fff;box-shadow:0 10px 24px rgba(53,99,233,.25)}.button-primary:hover{background:var(--primary-dark)}.button-soft{background:var(--soft);color:var(--primary)}.button-outline{background:#fff;color:var(--text);border-color:var(--border)}.button-danger{background:var(--danger-bg);color:var(--danger)}.button:disabled{opacity:.45;cursor:not-allowed}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:24px}.feature-grid article{padding:16px;border:1px solid var(--border);border-radius:16px;background:#fff}.feature-grid strong,.feature-grid span{display:block}.feature-grid span{font-size:12px;color:var(--muted);margin-top:7px;line-height:1.5}
.quiz-meta{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}.badge{display:inline-block;padding:7px 10px;background:var(--primary);color:#fff;border-radius:999px;font-size:12px;font-weight:900;margin:2px}.badge-light{background:var(--soft);color:var(--primary)}.quiz-numbers{display:flex;gap:14px;color:var(--muted);font-weight:900}
.progress{height:10px;margin:18px 0 26px;background:#e9eef6;border-radius:999px;overflow:hidden}.progress div{height:100%;width:0;background:linear-gradient(90deg,var(--primary),#6b90ff);transition:.25s}
.passage{padding:20px;background:#f9fbff;border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:18px;white-space:pre-line;line-height:1.85;margin-bottom:22px}
.question-text{font-size:clamp(20px,4.6vw,28px);line-height:1.65;white-space:pre-line}.option-list{display:grid;gap:12px}.option-button{width:100%;display:flex;align-items:flex-start;gap:14px;padding:16px;background:#fff;border:1px solid var(--border);border-radius:16px;text-align:left;box-shadow:var(--shadow-soft)}.option-button:hover{border-color:var(--primary)}.option-letter{width:34px;height:34px;display:grid;place-items:center;flex-shrink:0;background:#eef3ff;color:var(--primary);border-radius:10px;font-weight:900}.option-button.correct{background:var(--success-bg);border-color:var(--success)}.option-button.wrong{background:var(--danger-bg);border-color:var(--danger)}.option-button:disabled{color:var(--text);cursor:default}
.explanation,.advice-box{margin-top:22px;padding:20px;background:#f8fbff;border-radius:18px;border:1px solid var(--border);line-height:1.8}.vocabulary-list{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.vocabulary-item{background:#fff;border:1px solid var(--border);padding:7px 10px;border-radius:999px;font-size:13px}.estimated-score{font-size:22px;font-weight:900;color:var(--primary)}
.stats-grid,.analysis-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.stats-grid{margin:20px 0}.stat-box,.analysis-card{padding:18px;border:1px solid var(--border);border-radius:16px;background:#fff}.stat-box strong,.stat-box span{display:block}.stat-box strong{font-size:27px;margin-top:6px}.stat-box span,.analysis-card small{font-size:12px;color:var(--muted)}.result-list{border-top:1px solid var(--border);margin-top:24px}.result-row{display:grid;grid-template-columns:55px 1fr 130px 35px;gap:10px;padding:14px 0;border-bottom:1px solid var(--border);align-items:center}.analysis-card strong{display:block;font-size:29px;margin:9px 0 4px}.meter{height:8px;background:#edf0f5;border-radius:999px;overflow:hidden;margin-top:13px}.meter div{height:100%;background:var(--primary)}.empty-state{padding:28px;text-align:center;color:var(--muted);background:#f8fafc;border-radius:17px;border:1px dashed var(--border)}
.passage:has(.document-set){padding:0;background:transparent;border-left:0;border:0}.document-set{display:grid;gap:12px}.document-set-heading{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#1b2340;color:#fff;border-radius:14px}.document-set-heading span{font-size:11px;font-weight:900;letter-spacing:.14em}.document-set-heading strong{font-size:14px}.document-grid{display:grid;gap:16px}.document-grid-double,.document-grid-triple{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.document-card{background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-soft);white-space:normal}.document-label{padding:8px 13px;background:#eef2f7;color:#44516a;font-size:11px;font-weight:900;letter-spacing:.04em;text-transform:uppercase}.email-header{padding:15px 18px;background:#f8fafc;border-bottom:1px solid var(--border);display:grid;gap:5px;font-size:13px}.document-body{padding:18px;line-height:1.75}.document-card h3{margin:0;padding:18px 18px 7px;font-size:20px}.document-subtitle{margin:0;padding:0 18px 12px;color:var(--muted);font-weight:700}.document-fields{padding:9px 18px 16px;display:grid}.document-field{display:grid;grid-template-columns:minmax(105px,.8fr) 1.4fr;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}.document-field span{color:var(--muted);font-size:12px;font-weight:800}.document-field strong{font-size:13px}.document-note{margin:0;padding:14px 18px;background:#fff8df;border-top:1px solid #f1df9b;font-size:12px;line-height:1.6}.chat-title{padding:15px 18px;font-weight:900;border-bottom:1px solid var(--border)}.chat-row{display:grid;grid-template-columns:48px 1fr;gap:10px;padding:13px 16px;border-bottom:1px solid var(--border)}.chat-row:last-child{border-bottom:0}.chat-time{font-size:11px;color:var(--muted);padding-top:3px}.chat-row p{margin:4px 0 0;line-height:1.6;font-size:13px}
@media(max-width:780px){.score-grid,.settings-grid,.feature-grid,.analysis-grid,.stats-grid{grid-template-columns:1fr}.header-inner,.section-heading,.quiz-meta{align-items:flex-start}.header-inner{flex-direction:column}.result-row{grid-template-columns:45px 1fr 30px}.result-row .result-skill{display:none}.document-grid-double,.document-grid-triple{grid-template-columns:1fr}}
@media(max-width:600px){body{background:linear-gradient(180deg,#eef4ff 0,#f6f8fd 120px,#f5f7fb 100%)}.site-header{padding-top:env(safe-area-inset-top)}.header-inner,.container{width:min(100%,calc(100% - 20px))}.header-inner{padding:14px 0 12px}.panel{border-radius:24px;padding:16px}.question-count{font-size:12px;padding:7px 10px}.description{font-size:14px;line-height:1.75}.score-grid{gap:10px;margin:18px 0}.score-card{padding:18px;border-radius:18px}.score-range{font-size:22px}.score-card strong{font-size:18px}.score-card small{font-size:13px}.settings-grid{gap:10px;padding:12px;border-radius:16px}.settings-grid label{font-size:13px}.button-row{display:grid;grid-template-columns:1fr;position:sticky;bottom:12px;z-index:10}.button{width:100%;min-height:52px;border-radius:14px}.feature-grid article{padding:14px;border-radius:14px}.quiz-meta{gap:10px}.quiz-numbers{width:100%;justify-content:space-between;font-size:13px}.passage,.explanation,.advice-box{padding:16px;border-radius:16px}.option-button{padding:14px;border-radius:14px}.option-letter{width:32px;height:32px}.question-text{font-size:20px}.document-set-heading{padding:10px 12px}.document-card{border-radius:14px}.document-body,.email-header{padding:14px}.document-card h3{padding:15px 14px 6px;font-size:18px}.document-subtitle,.document-fields,.document-note,.chat-title,.chat-row{padding-left:14px;padding-right:14px}}


/* Vocabulary flashcards */
.vocabulary-launch{width:100%;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;margin:0 0 24px;padding:20px 22px;text-align:left;border:1px solid #b9ccff;border-radius:22px;background:linear-gradient(135deg,#eef4ff,#fff 58%,#e7efff);color:var(--text);box-shadow:var(--shadow-soft);transition:.22s}
.vocabulary-launch:hover{transform:translateY(-2px);border-color:var(--primary);box-shadow:var(--shadow)}
.vocabulary-launch-mark{display:grid;place-items:center;width:58px;height:58px;border-radius:18px;background:var(--primary);color:#fff;font-size:23px;font-weight:900;box-shadow:0 10px 24px rgba(53,99,233,.25)}
.vocabulary-launch-copy,.vocabulary-launch-copy strong,.vocabulary-launch-copy small,.vocabulary-launch-kicker{display:block}
.vocabulary-launch-kicker{font-size:10px;font-weight:900;letter-spacing:.12em;color:var(--primary)}
.vocabulary-launch-copy strong{font-size:23px;margin:4px 0}.vocabulary-launch-copy small{color:var(--muted);line-height:1.5}
.vocabulary-launch-arrow{font-size:40px;line-height:1;color:var(--primary)}
.vocabulary-heading{margin-bottom:8px}
.vocab-toolbar{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:12px;margin:22px 0;padding:16px;background:#f8faff;border:1px solid var(--border);border-radius:20px}
.vocab-toolbar label{display:grid;gap:8px;font-weight:900;font-size:14px}
input[type="search"]{width:100%;padding:14px 16px;border:1px solid var(--border);border-radius:14px;background:#fff;color:var(--text);outline:none}
input[type="search"]:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(53,99,233,.12)}
.vocab-summary{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px;font-weight:900}
.vocab-progress{margin:10px 0 22px}
.vocab-card{display:block;width:min(720px,100%);height:330px;margin:0 auto;border:0;background:transparent;padding:0;perspective:1200px;text-align:center}
.vocab-card-inner{position:relative;display:block;width:100%;height:100%;transition:transform .48s cubic-bezier(.2,.75,.25,1);transform-style:preserve-3d}
.vocab-card.flipped .vocab-card-inner{transform:rotateY(180deg)}
.vocab-face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:28px;border:1px solid var(--border);border-radius:28px;backface-visibility:hidden;box-shadow:var(--shadow);overflow:auto}
.vocab-front{background:linear-gradient(145deg,#fff,#edf3ff)}
.vocab-back{transform:rotateY(180deg);background:linear-gradient(145deg,#1f4fd0,#3563e9);color:#fff;border-color:#3563e9}
.vocab-face strong{font-size:clamp(31px,7vw,62px);line-height:1.2;overflow-wrap:anywhere}
.vocab-face small{margin-top:24px;color:var(--muted);font-weight:800}.vocab-back small{color:#dce6ff}
.vocab-kind{display:inline-block;margin-bottom:24px;padding:7px 11px;border-radius:999px;background:var(--soft);color:var(--primary);font-size:11px;font-weight:900;letter-spacing:.13em}
.vocab-back .vocab-kind{background:rgba(255,255,255,.16);color:#fff}
.vocab-actions{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;width:min(720px,100%);margin:20px auto 0}
.vocab-learned-active{background:var(--success-bg)!important;color:var(--success)!important;border-color:#9bd9ba!important}
.vocab-import-box{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:28px;padding:18px;border:1px solid var(--border);border-radius:18px;background:#fff}
.vocab-import-box p{margin:6px 0 0;color:var(--muted);font-size:13px;line-height:1.6}
.vocab-import-buttons{display:flex;gap:8px;flex-wrap:wrap;flex-shrink:0}
@media(max-width:780px){.vocab-toolbar{grid-template-columns:1fr}.vocab-import-box{align-items:stretch;flex-direction:column}.vocab-import-buttons{display:grid;grid-template-columns:1fr}.vocab-actions{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.vocabulary-launch{grid-template-columns:auto 1fr auto;padding:16px;gap:12px;border-radius:18px}.vocabulary-launch-mark{width:48px;height:48px;border-radius:15px;font-size:19px}.vocabulary-launch-copy strong{font-size:20px}.vocabulary-launch-copy small{font-size:12px}.vocab-toolbar{padding:12px;border-radius:16px}.vocab-card{height:300px}.vocab-face{padding:20px;border-radius:22px}.vocab-face strong{font-size:clamp(30px,10vw,48px)}.vocab-actions{position:static}.vocab-import-buttons .button{width:100%}}