.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; gap: .55rem; border: 1px solid transparent; border-radius: 999px; padding: .7rem 1.1rem; font-size: .92rem; font-weight: 800; line-height: 1.2; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.button-primary { background: var(--brand); color: #fff; }
.button-primary:hover { background: var(--brand-deep); color: #fff; }
.button-secondary { border-color: var(--brand); background: transparent; color: var(--brand); }
.button-secondary:hover { background: var(--brand-soft); color: var(--brand-deep); }
.button-accent { background: var(--accent); color: #fff; }
.button-accent:hover { background: var(--accent-deep); color: #fff; }
.button-quiet { border-color: var(--line); background: var(--surface); color: var(--ink); }
.button-quiet:hover { border-color: var(--brand); color: var(--brand); }
.button[disabled] { cursor: not-allowed; opacity: .5; transform: none; box-shadow: none; }
.button-link { border: 0; background: transparent; padding: 0; color: var(--brand); font-weight: 800; text-decoration: underline; text-underline-offset: .2em; }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }
.icon-button { display: inline-grid; min-width: 44px; min-height: 44px; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); font-size: 1.2rem; }

.page-intro { padding-block: var(--space-12) var(--space-8); border-bottom: 1px solid var(--line); }
.page-intro-grid { display: flex; align-items: end; justify-content: space-between; gap: var(--space-8); }
.page-intro h1 { font-size: clamp(2.35rem, 6vw, 4.5rem); }
.page-intro .lead { max-width: 690px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: var(--space-5); color: var(--ink-muted); font-size: .83rem; }
.breadcrumbs a { color: var(--ink-soft); }

.notice { border-left: 4px solid var(--brand); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; background: var(--brand-soft); padding: var(--space-4) var(--space-5); color: var(--ink); }
.notice-warning { border-color: var(--yellow); background: var(--yellow-soft); }
.notice-danger { border-color: var(--danger); background: var(--danger-soft); }
.notice-success { border-color: var(--success); background: var(--success-soft); }
.disclaimer { margin-block: var(--space-6); font-size: .9rem; }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-5); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-4); }
.surface { border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); box-shadow: var(--shadow-sm); }
.surface-pad { padding: var(--space-6); }
.surface:hover { border-color: color-mix(in srgb, var(--brand) 42%, var(--line)); }
.muted { color: var(--ink-muted); }
.rule { height: 1px; margin-block: var(--space-8); border: 0; background: var(--line); }

.stat-strip { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
.stat { padding: var(--space-5); }
.stat + .stat { border-left: 1px solid var(--line); }
.stat strong { display: block; color: var(--brand); font-size: clamp(1.7rem, 4vw, 2.8rem); line-height: 1; }
.stat span { display: block; margin-top: .45rem; color: var(--ink-muted); font-size: .85rem; }

.module-index { display: grid; grid-template-columns: 1.1fr 2fr; gap: var(--space-8); align-items: start; }
.module-list { display: grid; gap: var(--space-3); }
.module-row { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: var(--space-4); border-bottom: 1px solid var(--line); padding: var(--space-4) 0; }
.module-row:first-child { border-top: 1px solid var(--line); }
.module-number { display: inline-grid; width: 40px; height: 40px; place-items: center; border-radius: 50%; background: var(--brand); color: #fff; font-weight: 900; }
.module-row h3 { margin-bottom: .25rem; font-size: 1.1rem; }
.module-row p { margin: 0; color: var(--ink-muted); font-size: .9rem; }

.lesson-list { display: grid; gap: var(--space-3); }
.lesson-item { display: grid; grid-template-columns: 56px 1fr auto; align-items: center; gap: var(--space-4); border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); padding: var(--space-4) var(--space-5); text-decoration: none; transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
.lesson-item:hover { border-color: var(--brand); box-shadow: var(--shadow-sm); transform: translateX(3px); }
.lesson-item.is-done { background: var(--success-soft); }
.lesson-number { display: inline-grid; width: 44px; height: 44px; place-items: center; border-radius: 12px; background: var(--brand-soft); color: var(--brand); font-weight: 900; }
.lesson-item.is-done .lesson-number { background: var(--success); color: #fff; }
.lesson-item h3 { margin: 0 0 .2rem; font-size: 1.08rem; }
.lesson-item p { margin: 0; color: var(--ink-muted); font-size: .87rem; }
.lesson-status { color: var(--success); font-size: .8rem; font-weight: 800; }

.progress-track { overflow: hidden; height: 10px; border-radius: 99px; background: var(--line); }
.progress-fill { height: 100%; border-radius: inherit; background: var(--brand); transition: width .5s ease; }
.progress-fill.accent { background: var(--accent); }
.progress-meta { display: flex; justify-content: space-between; gap: var(--space-3); margin-bottom: .5rem; color: var(--ink-muted); font-size: .82rem; }

.callout { border-radius: var(--radius-lg); background: var(--brand); padding: clamp(var(--space-6), 5vw, var(--space-10)); color: #fff; }
.callout h2, .callout h3 { color: #fff; }
.callout p { color: #d7eceb; }
.callout .button-secondary { border-color: #c7e8e5; color: #fff; }

.icon-tile { display: grid; width: 54px; height: 54px; place-items: center; border-radius: 16px; background: var(--brand-soft); color: var(--brand); }
.feature { padding: var(--space-6) 0; border-top: 1px solid var(--line); }
.feature h3 { margin-top: var(--space-4); margin-bottom: .45rem; font-size: 1.25rem; }
.feature p { margin: 0; color: var(--ink-muted); }

.reading-layout { display: grid; grid-template-columns: minmax(0, var(--reading-width)) 250px; gap: var(--space-10); align-items: start; }
.reading-content > * + * { margin-top: var(--space-6); }
.reading-content h2 { margin-top: var(--space-10); font-size: clamp(1.65rem, 3.5vw, 2.3rem); }
.reading-content h3 { margin-top: var(--space-8); font-size: 1.3rem; }
.reading-content ul, .reading-content ol { padding-left: 1.4rem; }
.reading-content li + li { margin-top: .5rem; }
.reading-sidebar { position: sticky; top: 100px; }
.sidebar-box { border-top: 4px solid var(--accent); padding-top: var(--space-4); }
.sidebar-box + .sidebar-box { margin-top: var(--space-8); }
.sidebar-box h3 { font-size: 1rem; }

.lesson-hero { display: grid; grid-template-columns: 1fr auto; gap: var(--space-8); align-items: end; }
.lesson-hero h1 { font-size: clamp(2.3rem, 6vw, 4.7rem); }
.lesson-badge { display: inline-flex; align-items: center; gap: .5rem; margin-bottom: var(--space-4); color: var(--accent-deep); font-size: .84rem; font-weight: 800; }
.lesson-badge::before { content: ""; width: 28px; height: 4px; border-radius: 99px; background: var(--accent); }
.lesson-actions { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-4); border-block: 1px solid var(--line); padding-block: var(--space-5); }
.lesson-nav { display: flex; justify-content: space-between; gap: var(--space-3); }

.quiz-progress { display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-6); }
.quiz-progress .progress-track { flex: 1; }
.quiz-question { margin-bottom: var(--space-6); font-size: clamp(1.35rem, 3.5vw, 2rem); }
.quiz-options { display: grid; gap: var(--space-3); margin: 0; padding: 0; list-style: none; }
.quiz-option { width: 100%; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); padding: var(--space-4) var(--space-5); text-align: left; font-size: 1rem; transition: border-color .2s ease, background .2s ease; }
.quiz-option:hover { border-color: var(--brand); background: var(--brand-soft); }
.quiz-option.is-correct { border-color: var(--success); background: var(--success-soft); }
.quiz-option.is-wrong { border-color: var(--danger); background: var(--danger-soft); }
.quiz-option:disabled { cursor: default; }
.option-label { display: inline-grid; width: 30px; height: 30px; margin-right: .5rem; place-items: center; border: 1px solid currentColor; border-radius: 50%; font-weight: 800; }
.feedback { margin-top: var(--space-5); border-left: 4px solid var(--success); background: var(--success-soft); padding: var(--space-4) var(--space-5); }
.feedback.wrong { border-color: var(--danger); background: var(--danger-soft); }

.form-grid { display: grid; gap: var(--space-4); }
.form-field { display: grid; gap: .45rem; }
.form-field label { font-weight: 800; }
.form-field input, .form-field select { min-height: 48px; width: 100%; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); padding: .7rem .85rem; font-size: 1rem; }
.form-field input:focus, .form-field select:focus { border-color: var(--brand); outline: 3px solid color-mix(in srgb, var(--focus) 35%, transparent); }
.form-help { margin: 0; color: var(--ink-muted); font-size: .85rem; }

.settings-list { display: grid; gap: 0; }
.setting-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-4); border-top: 1px solid var(--line); padding-block: var(--space-5); }
.setting-copy { max-width: 600px; }
.setting-copy strong { display: block; margin-bottom: .2rem; }
.segmented { display: inline-flex; flex-wrap: wrap; gap: .35rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); padding: .25rem; }
.segmented button { border: 0; border-radius: 999px; background: transparent; padding: .5rem .8rem; font-weight: 800; }
.segmented button[aria-pressed="true"] { background: var(--brand); color: #fff; }

.certificate { position: relative; overflow: hidden; border: 10px solid var(--brand); background: var(--surface); padding: clamp(var(--space-8), 8vw, var(--space-16)); text-align: center; }
.certificate::before, .certificate::after { position: absolute; content: ""; width: 180px; height: 180px; border: 1px solid var(--accent); border-radius: 50%; opacity: .35; }
.certificate::before { top: -110px; left: -90px; }
.certificate::after { right: -90px; bottom: -110px; }
.certificate h2 { color: var(--brand); font-size: clamp(2rem, 5vw, 3.8rem); }
.certificate-name { margin-block: var(--space-8); border-bottom: 2px solid var(--line); padding-bottom: var(--space-3); color: var(--ink); font-family: Georgia, serif; font-size: clamp(1.6rem, 4vw, 2.6rem); }

.faq-item { border-top: 1px solid var(--line); }
.faq-item summary { cursor: pointer; padding: var(--space-5) 0; font-weight: 800; }
.faq-item p { padding: 0 0 var(--space-5); color: var(--ink-soft); }

.toast-region { position: fixed; right: 1rem; bottom: 1rem; z-index: 50; display: grid; gap: .6rem; max-width: min(360px, calc(100% - 2rem)); }
.toast { border: 1px solid var(--line); border-left: 4px solid var(--brand); border-radius: var(--radius-sm); background: var(--surface); box-shadow: var(--shadow-md); padding: .8rem 1rem; color: var(--ink); font-size: .9rem; animation: toast-in .25s ease both; }
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.reveal { animation: reveal .55s ease both; }
@keyframes reveal { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }