.free-hero { background: #1d1d1b; color: #fff; padding: 84px 0 72px; }
.free-hero-inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; }
.free-hero-inner > div { max-width: 760px; }
.free-hero h1 { margin-top: 18px; font-size: clamp(40px, 6vw, 68px); line-height: 1.02; letter-spacing: -.045em; }
.free-hero p { margin-top: 20px; max-width: 680px; color: rgba(255,255,255,.72); font-size: 17px; }
.free-hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.free-hero-meta span { padding: 7px 12px; border: 1px solid rgba(255,255,255,.16); border-radius: 999px; color: rgba(255,255,255,.72); font-size: 12px; }

.free-main { min-height: 620px; padding: 74px 0 88px; background: #f5f5f2; }
.free-shell { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }
.free-noscript { padding: 30px; background: #fff4db; border-radius: 14px; }
.free-page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 30px; }
.free-page-head h2 { font-size: clamp(28px, 4vw, 42px); line-height: 1.1; letter-spacing: -.035em; }
.free-page-head p { margin-top: 10px; max-width: 660px; color: #6d6d6d; }
.free-progress-total { flex: 0 0 auto; padding: 12px 16px; border-radius: 12px; background: #e7f4ec; color: #0b6e40; font-size: 13px; font-weight: 700; }

.free-dashboard { overflow: hidden; border: 1px solid #deddd8; border-radius: 18px; background: #fff; box-shadow: 0 22px 60px rgba(30,30,28,.07); }
.free-dashboard-head { display: flex; justify-content: space-between; gap: 20px; padding: 20px 24px; border-bottom: 1px solid #ecebe7; }
.free-dashboard-head strong { font-size: 14px; }
.free-dashboard-head span { color: #92928e; font-size: 12px; }
.free-course-row { width: 100%; display: grid; grid-template-columns: minmax(220px, 1.3fr) minmax(180px, 1fr) 84px 26px; align-items: center; gap: 18px; padding: 18px 24px; border: 0; border-bottom: 1px solid #ecebe7; background: #fff; color: #171715; text-align: left; cursor: pointer; font: inherit; transition: background .16s; }
.free-course-row:last-child { border-bottom: 0; }
.free-course-row:hover { background: #fafaf8; }
.free-course-name { display: flex; align-items: center; gap: 14px; font-weight: 650; }
.free-course-icon { width: 40px; height: 40px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 10px; background: #e7f4ec; color: #087143; font-size: 12px; font-weight: 750; }
.free-course-copy { color: #74746f; font-size: 13px; }
.free-course-score { justify-self: end; padding: 5px 10px; border-radius: 999px; background: #f0f0ed; color: #777; font-size: 12px; font-weight: 700; }
.free-course-score.done { background: #e2f4ea; color: #087143; }
.free-course-arrow { color: #aaa; font-size: 20px; }

.free-back { margin-bottom: 22px; border: 0; background: transparent; color: #555; cursor: pointer; font: inherit; font-size: 14px; font-weight: 600; }
.free-back:hover { color: #111; }
.free-course-hero { display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: center; padding: 30px; border-radius: 18px; background: #20201e; color: #fff; }
.free-course-title { display: flex; align-items: center; gap: 17px; }
.free-course-title .free-course-icon { width: 52px; height: 52px; font-size: 14px; }
.free-course-title h2 { font-size: clamp(25px, 4vw, 38px); letter-spacing: -.035em; }
.free-course-hero p { margin-top: 10px; color: rgba(255,255,255,.62); }
.free-course-hero .btn { min-width: 190px; }

.free-access-grid { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 20px; margin-top: 20px; }
.free-open-card, .free-lock-panel { border: 1px solid #dfded9; border-radius: 16px; background: #fff; }
.free-open-card { padding: 25px; }
.free-open-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.free-open-top h3 { font-size: 20px; }
.free-open-top p { margin-top: 7px; color: #70706c; font-size: 14px; }
.free-badge { padding: 6px 10px; border-radius: 999px; background: #e3f5eb; color: #087143; font-size: 11px; font-weight: 750; text-transform: uppercase; letter-spacing: .06em; }
.difficulty-ramp { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; margin-top: 24px; }
.difficulty-ramp span { height: 8px; border-radius: 99px; background: #dfeee5; }
.difficulty-ramp span:nth-child(n+4) { background: #b8dfc9; }
.difficulty-ramp span:nth-child(n+7) { background: #f0c97a; }
.difficulty-ramp span:nth-child(n+9) { background: #e59074; }
.difficulty-ramp span:last-child { background: #b84135; }
.ramp-labels { display: flex; justify-content: space-between; margin-top: 7px; color: #898984; font-size: 10px; }
.free-open-actions { display: flex; align-items: center; gap: 14px; margin-top: 24px; }
.free-open-actions small { color: #888; }

.free-lock-panel { padding: 22px; }
.free-lock-panel h3 { font-size: 16px; }
.free-lock-panel > p { margin-top: 7px; color: #777; font-size: 13px; }
.locked-tests { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; margin-top: 17px; max-height: 280px; overflow: auto; padding-right: 4px; }
.locked-test { min-height: 42px; border: 1px solid #e1e0db; border-radius: 9px; background: #f7f7f5; color: #7e7e79; cursor: pointer; font: inherit; font-size: 11px; }
.locked-test:hover { border-color: #c3c2bd; background: #efefec; }
.lock-note { margin-top: 14px; min-height: 40px; padding: 10px 12px; border-radius: 9px; background: #f3f3f0; color: #666; font-size: 12px; line-height: 1.45; }
.lock-note.is-active { background: #fff2d9; color: #735016; }

.quiz-shell { max-width: 900px; margin: 0 auto; }
.quiz-top { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; margin-bottom: 18px; }
.quiz-top .free-back { margin: 0; }
.quiz-track { height: 8px; border-radius: 99px; background: #deded9; overflow: hidden; }
.quiz-track i { display: block; height: 100%; border-radius: inherit; background: #0e8a4f; transition: width .25s; }
.quiz-count { color: #74746f; font-size: 13px; font-weight: 650; white-space: nowrap; }
.quiz-card { padding: clamp(24px, 5vw, 48px); border: 1px solid #deddd8; border-radius: 20px; background: #fff; box-shadow: 0 24px 70px rgba(28,28,26,.08); }
.quiz-meta { display: flex; justify-content: space-between; align-items: center; gap: 14px; }
.quiz-meta strong { color: #0b7445; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.difficulty-chip { padding: 6px 10px; border-radius: 99px; background: #e8f3ec; color: #0b7043; font-size: 11px; font-weight: 750; }
.difficulty-chip[data-level="8"], .difficulty-chip[data-level="9"] { background: #fff0d5; color: #845b12; }
.difficulty-chip[data-level="10"] { background: #ffe5e2; color: #9c2e25; }
.quiz-focus { display: flex; align-items: center; gap: 9px; width: fit-content; margin-top: 18px; padding: 7px 10px; border: 1px solid #e1e4df; border-radius: 8px; background: #f7f8f5; color: #4f504b; font-size: 12px; }
.quiz-focus span { color: #777972; }
.quiz-focus strong { color: #2b2d29; font-weight: 700; }
.quiz-feedback + .quiz-focus { margin-top: 12px; }
.quiz-prompt { margin-top: 24px; font-size: clamp(21px, 3.5vw, 30px); line-height: 1.35; font-weight: 600; letter-spacing: -.02em; }
.series-prompt { margin-top: 28px; }
.series-prompt > p { margin-bottom: 16px; color: #555550; font-size: 13px; font-weight: 600; text-align: center; }
.number-series { display: flex; align-items: center; justify-content: center; gap: clamp(8px, 2vw, 17px); padding: 13px 4px 19px; overflow-x: auto; overscroll-behavior-inline: contain; scrollbar-width: thin; }
.number-tile { width: 54px; height: 54px; flex: 0 0 54px; display: grid; place-items: center; border: 2px solid #20201e; background: #fff; color: #171715; font: 650 13px/1.05 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: center; }
.number-tile.is-missing { border-style: dashed; background: #f4faf7; color: #087544; }
.number-tile .math-frac { font-size: 1.08em; }
.checking-pair { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 14px; margin-top: 26px; padding: 22px; border-radius: 13px; background: #f4f4f1; font: 650 clamp(17px, 3vw, 24px)/1.2 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: center; word-break: break-all; }
.checking-pair i { color: #aaa; font-style: normal; }
.checking-string { display: inline-flex; justify-content: center; flex-wrap: wrap; gap: .04em; }
.checking-char { min-width: .62em; padding: .08em .03em; border-radius: 4px; }
.checking-char.is-different { background: #ffe1de; color: #a5271d; box-shadow: inset 0 0 0 1px #e59a93; }
.answer-options { display: grid; grid-template-columns: 1fr; gap: 7px; margin-top: 22px; }
.answer-option { min-height: 50px; padding: 8px 16px; border: 1px solid #d9d8d3; border-radius: 12px; background: #fff; color: #20201e; cursor: pointer; font: inherit; font-size: 14px; font-weight: 600; text-align: left; transition: border-color .15s, background .15s, transform .15s; }
.answer-option:hover:not(:disabled) { border-color: #0e8a4f; transform: translateY(-1px); }
.answer-option.is-selected { border-color: #0e8a4f; background: #e9f5ee; }
.answer-option.is-correct { border-color: #0e8a4f; background: #dff4e9; color: #075b35; }
.answer-option.is-wrong { border-color: #d87970; background: #fff0ee; color: #982f26; }
.answer-option:disabled { cursor: default; }
.answer-options.number-answer-options { grid-template-columns: 1fr; gap: 7px; margin-top: 20px; }
.number-answer-options .answer-option { min-height: 50px; display: flex; align-items: center; gap: 12px; border-color: #e4e6e5; border-radius: 4px; background: #f1f3f4; font-weight: 500; }
.number-answer-options .answer-option:hover:not(:disabled) { border-color: #8ccdab; background: #eaf4ee; transform: none; }
.number-answer-options .answer-option.is-selected { border-color: #69c796; background: #dff3e8; }
.number-answer-options .answer-option.is-correct { border-color: #35ad70; background: #6eca98; color: #113d29; }
.number-answer-options .answer-option.is-wrong { border-color: #dc847a; background: #fff0ee; }
.option-radio { width: 15px; height: 15px; flex: 0 0 15px; display: grid; place-items: center; border: 1px solid #bfc5c1; border-radius: 50%; background: #fff; }
.answer-option.is-selected .option-radio::after, .answer-option.is-correct .option-radio::after { content: ''; width: 7px; height: 7px; border-radius: 50%; background: #138953; }
.answer-input { width: 100%; margin-top: 28px; padding: 16px 18px; border: 1px solid #d7d6d1; border-radius: 12px; font: inherit; font-size: 18px; }
.double-groups { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 26px; }
.double-group { padding: 18px; border-radius: 13px; background: #f5f5f2; }
.double-group h3 { margin-bottom: 12px; font-size: 13px; color: #70706c; text-transform: uppercase; letter-spacing: .06em; }
.double-group .answer-options { grid-template-columns: 1fr; margin-top: 0; }
.figure-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 9px; margin-top: 28px; }
.figure-option { padding: 9px; border: 1px solid #deddd8; border-radius: 12px; background: #fff; cursor: pointer; text-align: center; }
.figure-option:hover:not(:disabled) { border-color: #0e8a4f; }
.figure-option.is-selected { border-color: #0e8a4f; background: #eaf5ee; }
.figure-option.is-correct { border-color: #0e8a4f; background: #dff4e9; }
.figure-option.is-wrong { border-color: #d87970; background: #fff0ee; }
.figure-option svg { width: 100%; aspect-ratio: 1; color: #111; }
.figure-option span { display: block; margin-top: 5px; font-size: 12px; font-weight: 750; }
.mirror-reference { width: 150px; margin: 24px auto 0; padding: 13px; border: 1px solid #d8d7d2; border-radius: 12px; background: #fafaf8; text-align: center; }
.mirror-reference small { display: block; margin-bottom: 7px; color: #777; font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.mirror-reference svg { width: 100%; }
.quiz-actions { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin-top: 28px; }
.quiz-actions > span:empty { display: none; }
.quiz-actions .btn { min-width: 170px; margin-left: auto; }
.quiz-actions .btn:disabled { opacity: .48; cursor: not-allowed; transform: none; }
.quiz-feedback { margin-top: 22px; padding: 18px; border-radius: 12px; background: #edf7f1; color: #244d38; font-size: 14px; line-height: 1.6; }
.quiz-feedback.wrong { background: #fff0ee; color: #71342f; }
.quiz-feedback strong { display: block; margin-bottom: 4px; }
.math-frac { display: inline-flex; align-items: center; justify-content: center; min-width: 0; margin: 0 .06em; vertical-align: middle; line-height: 1; white-space: nowrap; }
.math-frac-top, .math-frac-bottom { display: inline-block; padding: 0; font-size: .68em; line-height: 1; font-variant-numeric: tabular-nums; }
.math-frac-top { transform: translateY(-.3em); }
.math-frac-slash { display: inline-block; margin: 0 .015em; font-size: 1em; line-height: 1; }
.math-frac-bottom { transform: translateY(.3em); }

.result-card { max-width: 760px; margin: 0 auto; padding: clamp(28px, 6vw, 56px); border-radius: 20px; background: #20201e; color: #fff; text-align: center; }
.result-ring { width: 142px; height: 142px; margin: 0 auto 24px; border: 10px solid rgba(255,255,255,.12); border-top-color: #45c78a; border-radius: 50%; display: grid; place-items: center; }
.result-ring > span { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.result-ring b { font-size: 34px; }
.result-ring small { max-width: 88px; color: rgba(255,255,255,.66); font-size: 10px; line-height: 1.15; text-transform: uppercase; letter-spacing: .05em; }
.result-card h2 { font-size: clamp(28px, 5vw, 42px); letter-spacing: -.035em; }
.result-card > p { margin: 13px auto 0; max-width: 570px; color: rgba(255,255,255,.66); }
.result-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.result-actions .btn-outline-light { border-color: rgba(255,255,255,.25); }
.result-value { margin-top: 26px; padding: 17px; border-radius: 12px; background: rgba(255,255,255,.07); color: rgba(255,255,255,.76); font-size: 13px; }

.free-disclaimer { padding: 26px 0; background: #ecece8; color: #666; }
.free-disclaimer p { font-size: 12.5px; line-height: 1.6; }

@media (max-width: 900px) {
  .free-hero-inner { align-items: flex-start; flex-direction: column; }
  .free-access-grid { grid-template-columns: 1fr; }
  .free-course-row { grid-template-columns: minmax(200px, 1.2fr) minmax(160px, 1fr) 72px 20px; }
}
@media (max-width: 650px) {
  .free-hero { padding: 68px 0 58px; }
  .free-main { padding: 54px 0 68px; }
  .free-shell { width: min(100% - 28px, 1120px); }
  .free-page-head { align-items: flex-start; flex-direction: column; }
  .free-dashboard-head span { display: none; }
  .free-course-row { grid-template-columns: 1fr auto 18px; gap: 10px; padding: 16px; }
  .free-course-copy { display: none; }
  .free-course-title { align-items: flex-start; }
  .free-course-hero { grid-template-columns: 1fr; padding: 24px; }
  .free-course-hero .btn { width: 100%; }
  .free-open-top { flex-direction: column-reverse; }
  .free-open-actions { align-items: stretch; flex-direction: column; }
  .free-open-actions .btn { width: 100%; }
  .quiz-top { grid-template-columns: auto 1fr; }
  .quiz-count { grid-column: 1 / -1; grid-row: 2; text-align: right; }
  .quiz-card { padding: 22px 18px; }
  .number-series { justify-content: center; }
  .number-tile { width: 46px; height: 46px; flex-basis: 46px; font-size: 11px; }
  .answer-options { grid-template-columns: 1fr; }
  .double-groups { grid-template-columns: 1fr; }
  .figure-row { grid-template-columns: repeat(3, 1fr); }
  .checking-pair { grid-template-columns: 1fr; }
  .checking-pair i { width: fit-content; justify-self: center; font-size: 0; }
  .checking-pair i::before { content: '↓'; font-size: 18px; }
  .quiz-actions { align-items: stretch; flex-direction: column; }
  .quiz-actions .btn { width: 100%; }
}