:root {
  --ink: #12233f;
  --ink-soft: #31415c;
  --paper: #f3f6fb;
  --surface: #ffffff;
  --line: #dce4ef;
  --muted: #68778e;
  --accent: #1a9d94;
  --accent-dark: #08766f;
  --accent-soft: #e0f5f2;
  --gold: #e5a72d;
  --gold-soft: #fff3d7;
  --danger: #b84755;
  --shadow: 0 12px 35px rgba(20, 36, 61, .08);
  --radius: 20px;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--paper); }
body { margin: 0; min-height: 100vh; color: var(--ink); background: var(--paper); font: 16px/1.5 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
.app-shell { min-height: 100vh; }
.sidebar { position: fixed; inset: 0 auto 0 0; z-index: 20; width: 270px; display: flex; flex-direction: column; padding: 28px 20px; color: #fff; background: var(--ink); }
.brand { display: flex; gap: 13px; align-items: center; margin: 0 6px 38px; }
.brand-mark { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 15px; color: var(--ink); background: var(--accent); font-weight: 850; letter-spacing: -.04em; }
.brand strong, .brand span { display: block; }
.brand strong { font-size: 1.08rem; }
.brand span { color: #aebbd0; font-size: .8rem; }
.nav-list { display: grid; gap: 7px; }
.nav-button { width: 100%; min-height: 48px; display: flex; gap: 13px; align-items: center; padding: 0 14px; border: 0; border-radius: 13px; color: #c9d3e1; background: transparent; cursor: pointer; text-align: left; }
.nav-button:hover { background: rgba(255,255,255,.06); }
.nav-button.active { color: #fff; background: rgba(36,176,165,.18); }
.nav-icon { width: 24px; font-size: 1.18rem; text-align: center; }
.sidebar-goal { margin-top: auto; padding: 17px; border: 1px solid rgba(255,255,255,.1); border-radius: 16px; background: rgba(255,255,255,.04); }
.sidebar-goal span, .sidebar-goal strong, .sidebar-goal small { display: block; }
.sidebar-goal span { color: #aebbd0; font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; }
.sidebar-goal strong { margin-top: 4px; }
.sidebar-goal small { color: #aebbd0; }
.main { margin-left: 270px; min-height: 100vh; }
.topbar { height: 112px; display: flex; align-items: center; justify-content: space-between; padding: 22px clamp(24px, 4vw, 58px) 14px; border-bottom: 1px solid var(--line); background: rgba(243,246,251,.92); backdrop-filter: blur(12px); }
.topbar h1 { margin: 1px 0 0; font-size: clamp(1.75rem, 3vw, 2.35rem); line-height: 1.15; letter-spacing: -.04em; }
.eyebrow { margin: 0; color: var(--muted); font-size: .78rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.icon-button { width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); cursor: pointer; box-shadow: var(--shadow); font-size: 1.4rem; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.sync-status { padding: 6px 10px; border-radius: 999px; color: var(--muted); background: #e9eef6; font-size: .76rem; font-weight: 700; white-space: nowrap; }
.sync-status.saved { color: var(--accent-dark); background: var(--accent-soft); }
.sync-status.saving { color: #805a16; background: var(--gold-soft); }
.sync-status.error { color: var(--danger); background: #fae9ec; }
.logout-link { color: var(--muted); font-size: .8rem; font-weight: 700; text-decoration: none; }
.logout-link:hover { color: var(--ink); }
.view { max-width: 1320px; margin: 0 auto; padding: 30px clamp(24px, 4vw, 58px) 64px; }
.bottom-nav { display: none; }
.grid { display: grid; gap: 20px; }
.dashboard-grid { grid-template-columns: minmax(0, 1.55fr) minmax(290px, .8fr); align-items: start; }
.card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.card-pad { padding: clamp(19px, 3vw, 28px); }
.hero-card { overflow: hidden; color: #fff; background: linear-gradient(135deg, #12233f 0%, #1b355b 68%, #175a65 100%); border: 0; }
.hero-card .card-pad { position: relative; }
.hero-card .card-pad::after { content: "B2"; position: absolute; right: -8px; bottom: -75px; color: rgba(255,255,255,.055); font-size: 15rem; font-weight: 900; line-height: 1; letter-spacing: -.1em; }
.hero-top { position: relative; z-index: 1; display: flex; justify-content: space-between; gap: 20px; }
.week-label { margin: 0 0 8px; color: #8ee1da; font-size: .78rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.hero-card h2 { max-width: 680px; margin: 0; font-size: clamp(1.45rem, 3vw, 2.2rem); line-height: 1.2; letter-spacing: -.035em; }
.hero-card p { position: relative; z-index: 1; max-width: 720px; color: #d2dcea; }
.week-pill { flex: 0 0 auto; height: fit-content; padding: 7px 11px; border-radius: 999px; background: rgba(255,255,255,.12); font-size: .8rem; }
.progress-row { position: relative; z-index: 1; display: flex; align-items: center; gap: 12px; margin-top: 22px; }
.progress-track { width: 100%; height: 9px; overflow: hidden; border-radius: 999px; background: rgba(255,255,255,.15); }
.progress-fill { height: 100%; border-radius: inherit; background: var(--accent); transition: width .3s ease; }
.progress-text { flex: 0 0 auto; color: #fff; font-size: .86rem; font-weight: 750; }
.section-title { display: flex; justify-content: space-between; gap: 14px; align-items: center; margin: 0 0 15px; }
.section-title h2, .section-title h3 { margin: 0; letter-spacing: -.025em; }
.section-title h2 { font-size: 1.3rem; }
.section-title h3 { font-size: 1.08rem; }
.muted { color: var(--muted); }
.small { font-size: .84rem; }
.task-list { display: grid; gap: 12px; }
.task { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: start; padding: 17px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.task.done { border-color: #b9e3de; background: #f3fbfa; }
.check { width: 24px; height: 24px; margin-top: 1px; border: 2px solid #b8c5d6; border-radius: 8px; background: #fff; cursor: pointer; appearance: none; }
.check:checked { border-color: var(--accent); background: var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='m6 12 4 4 8-9'/%3E%3C/svg%3E") center/18px no-repeat; }
.task-title { margin: 0; font-weight: 760; }
.task.done .task-title { text-decoration: line-through; text-decoration-color: #78aaa4; }
.task-desc { margin: 4px 0 0; color: var(--muted); font-size: .9rem; }
.task-meta { padding: 5px 9px; border-radius: 9px; color: var(--accent-dark); background: var(--accent-soft); font-size: .76rem; font-weight: 750; white-space: nowrap; }
.prompt-box { margin-top: 14px; padding: 16px; border-radius: 15px; background: #f5f8fc; }
.prompt-box strong { display: block; margin-bottom: 5px; font-size: .86rem; }
.prompt-box p { margin: 0; color: var(--ink-soft); }
.lesson-open-button { width: 100%; margin-top: 14px; }
.lesson-modal { width: min(820px, 100%); }
.lesson-sections { display: grid; gap: 15px; margin-top: 20px; }
.lesson-section { padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: #fbfcfe; }
.lesson-section-head { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; }
.lesson-section-head h3 { margin: 0; font-size: 1.05rem; }
.lesson-number { flex: 0 0 auto; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; color: #fff; background: var(--accent-dark); font-size: .8rem; font-weight: 800; }
.lesson-content > :first-child, .answer-box > :first-child { margin-top: 0; }
.lesson-content > :last-child, .answer-box > :last-child { margin-bottom: 0; }
.lesson-list, .lesson-content ol, .lesson-content ul, .answer-box ol, .answer-box ul { padding-left: 23px; }
.lesson-list li, .lesson-content li, .answer-box li { margin: 6px 0; }
.lesson-vocab { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 8px; }
.lesson-vocab div { padding: 10px 12px; border-radius: 10px; background: #fff; }
.lesson-vocab strong, .lesson-vocab span { display: block; }
.lesson-vocab span { color: var(--muted); font-size: .82rem; }
.answer-box { margin-top: 12px; padding: 14px; border-left: 3px solid var(--accent); border-radius: 0 12px 12px 0; background: var(--accent-soft); }
.note-area { width: 100%; min-height: 104px; resize: vertical; padding: 13px 14px; border: 1px solid var(--line); border-radius: 13px; color: var(--ink); background: #fbfcfe; outline: none; }
.note-area:focus, .field:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(26,157,148,.12); }
.button { min-height: 44px; display: inline-flex; justify-content: center; align-items: center; gap: 8px; padding: 0 16px; border: 0; border-radius: 12px; color: #fff; background: var(--ink); cursor: pointer; font-weight: 740; }
.button:hover { filter: brightness(1.07); }
.button.accent { background: var(--accent-dark); }
.button.secondary { color: var(--ink); background: #e9eef6; }
.button.danger { color: var(--danger); background: #fae9ec; }
.button.small-button { min-height: 36px; padding: 0 12px; font-size: .84rem; }
.button-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.stat { padding: 16px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.stat strong { display: block; font-size: 1.55rem; line-height: 1.1; letter-spacing: -.04em; }
.stat span { display: block; margin-top: 5px; color: var(--muted); font-size: .78rem; }
.ring-wrap { display: grid; place-items: center; padding: 8px 0 2px; }
.ring { --p: 0; position: relative; width: 156px; height: 156px; display: grid; place-items: center; border-radius: 50%; background: conic-gradient(var(--accent) calc(var(--p) * 1%), #e5ebf3 0); }
.ring::before { content: ""; width: 120px; height: 120px; border-radius: 50%; background: #fff; }
.ring-label { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.ring-label strong { display: block; font-size: 1.7rem; }
.ring-label span { color: var(--muted); font-size: .78rem; }
.focus-list { display: grid; gap: 10px; }
.focus-item { padding: 12px 13px; border-left: 3px solid var(--accent); border-radius: 0 10px 10px 0; background: #f3f7fb; }
.focus-item strong { display: block; font-size: .86rem; }
.focus-item span { color: var(--muted); font-size: .82rem; }
.week-grid { display: grid; gap: 13px; }
.week-card { width: 100%; display: grid; grid-template-columns: 60px minmax(0,1fr) auto; gap: 16px; align-items: center; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: #fff; cursor: pointer; text-align: left; }
.week-card:hover { border-color: #b8c6d8; transform: translateY(-1px); }
.week-card.current { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(26,157,148,.1); }
.week-card.completed { background: #f5fbfa; }
.week-no { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; color: var(--ink); background: #eaf0f7; font-weight: 820; }
.week-card.current .week-no { color: #fff; background: var(--accent-dark); }
.week-card h3 { margin: 0 0 4px; font-size: 1rem; }
.week-card p { margin: 0; color: var(--muted); font-size: .83rem; }
.week-score { min-width: 58px; text-align: right; font-weight: 800; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.filter { min-height: 36px; padding: 0 13px; border: 1px solid var(--line); border-radius: 999px; background: #fff; cursor: pointer; font-size: .84rem; }
.filter.active { color: #fff; border-color: var(--ink); background: var(--ink); }
.vocab-toolbar { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 10px; margin-bottom: 18px; }
.field { width: 100%; min-height: 44px; padding: 0 13px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink); background: #fff; outline: none; }
.field.textarea { min-height: 90px; padding-top: 12px; resize: vertical; }
.vocab-list { display: grid; gap: 10px; }
.vocab-item { width: 100%; display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,1fr) auto; gap: 15px; align-items: center; padding: 15px 17px; border: 1px solid var(--line); border-radius: 14px; background: #fff; cursor: pointer; text-align: left; }
.vocab-en { font-weight: 790; }
.vocab-ru { color: var(--muted); }
.status { padding: 5px 9px; border-radius: 999px; font-size: .73rem; font-weight: 760; white-space: nowrap; }
.status.new { color: #5b6676; background: #edf1f6; }
.status.learning { color: #946217; background: var(--gold-soft); }
.status.mastered { color: #08766f; background: var(--accent-soft); }
.progress-layout { grid-template-columns: repeat(2, minmax(0,1fr)); }
.bar-list { display: grid; gap: 14px; }
.bar-row { display: grid; grid-template-columns: 110px 1fr 45px; gap: 10px; align-items: center; font-size: .84rem; }
.bar { height: 9px; overflow: hidden; border-radius: 999px; background: #e8edf4; }
.bar > span { display: block; height: 100%; border-radius: inherit; background: var(--accent); }
.milestones { display: grid; gap: 0; }
.milestone { position: relative; display: grid; grid-template-columns: 24px 105px minmax(0,1fr); gap: 12px; padding: 0 0 22px; }
.milestone::before { content: ""; position: absolute; left: 7px; top: 15px; bottom: 0; width: 2px; background: var(--line); }
.milestone:last-child::before { display: none; }
.dot { position: relative; z-index: 1; width: 16px; height: 16px; margin-top: 3px; border: 3px solid #cdd7e5; border-radius: 50%; background: #fff; }
.milestone.passed .dot { border-color: var(--accent); background: var(--accent); }
.milestone-date { color: var(--muted); font-size: .78rem; }
.milestone strong { display: block; font-size: .9rem; }
.milestone span { color: var(--muted); font-size: .8rem; }
.empty { padding: 36px 20px; border: 1px dashed #c9d4e2; border-radius: 16px; text-align: center; color: var(--muted); }
.form-grid { display: grid; gap: 13px; }
.form-grid label { display: grid; gap: 6px; color: var(--muted); font-size: .82rem; }
.form-grid label .field { color: var(--ink); font-size: 1rem; }
.modal-backdrop { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 18px; background: rgba(10,23,42,.55); backdrop-filter: blur(5px); }
.modal { width: min(560px, 100%); max-height: min(760px, 90vh); overflow: auto; padding: 24px; border-radius: 22px; background: #fff; box-shadow: 0 30px 90px rgba(10,23,42,.25); }
.modal h2 { margin: 0 0 6px; }
.modal > p { margin-top: 0; color: var(--muted); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 200; max-width: 330px; padding: 12px 16px; border-radius: 12px; color: #fff; background: var(--ink); box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(10px); transition: .2s ease; }
.toast.show { opacity: 1; transform: translateY(0); }
.settings-list { display: grid; gap: 12px; }
.settings-row { display: flex; justify-content: space-between; gap: 18px; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--line); }
.settings-row:last-child { border-bottom: 0; }
.settings-row strong, .settings-row span { display: block; }
.settings-row span { color: var(--muted); font-size: .82rem; }
.auth-body { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: linear-gradient(135deg, #12233f 0%, #1b355b 65%, #175a65 100%); }
.auth-card { width: min(440px, 100%); padding: clamp(24px, 5vw, 38px); border-radius: 24px; background: #fff; box-shadow: 0 30px 80px rgba(5,18,36,.3); }
.auth-card.install-card { width: min(760px, 100%); }
.auth-card h1 { margin: 25px 0 6px; font-size: clamp(1.7rem, 4vw, 2.2rem); letter-spacing: -.04em; }
.auth-card > p { margin: 0 0 22px; color: var(--muted); }
.auth-brand { display: flex; gap: 12px; align-items: center; }
.auth-brand strong, .auth-brand span { display: block; }
.auth-brand span { color: var(--muted); font-size: .82rem; }
.auth-form { display: grid; gap: 15px; }
.auth-form label { display: grid; gap: 6px; color: var(--muted); font-size: .84rem; }
.auth-form h2 { margin: 12px 0 0; font-size: 1.05rem; }
.auth-error, .auth-success { margin: 0 0 18px; padding: 13px 15px; border-radius: 12px; }
.auth-error { color: #8f2d3a; background: #fae9ec; }
.auth-success { color: var(--accent-dark); background: var(--accent-soft); }
.auth-main-button { width: 100%; margin-top: 5px; text-decoration: none; }
.install-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }

@media (max-width: 950px) {
  .sidebar { width: 225px; }
  .main { margin-left: 225px; }
  .dashboard-grid, .progress-layout { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { padding-bottom: calc(72px + env(safe-area-inset-bottom)); }
  .sidebar { display: none; }
  .main { margin-left: 0; }
  .topbar { height: 94px; padding: 18px 18px 12px; }
  .sync-status { max-width: 126px; overflow: hidden; text-overflow: ellipsis; }
  .logout-link { display: none; }
  .view { padding: 20px 14px 32px; }
  .bottom-nav { position: fixed; inset: auto 0 0 0; z-index: 40; height: calc(68px + env(safe-area-inset-bottom)); display: grid; grid-template-columns: repeat(5, 1fr); padding: 7px 4px env(safe-area-inset-bottom); border-top: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
  .bottom-nav .nav-button { min-height: 52px; display: grid; justify-items: center; align-content: center; gap: 1px; padding: 0; border-radius: 10px; color: var(--muted); font-size: .67rem; text-align: center; }
  .bottom-nav .nav-button.active { color: var(--accent-dark); background: var(--accent-soft); }
  .bottom-nav .nav-icon { font-size: 1.18rem; line-height: 1; }
  .hero-top { display: block; }
  .week-pill { display: inline-block; margin-top: 14px; }
  .hero-card .card-pad::after { font-size: 10rem; bottom: -45px; }
  .stats { grid-template-columns: repeat(3, 1fr); }
  .stat { padding: 12px 10px; }
  .stat strong { font-size: 1.28rem; }
  .task { grid-template-columns: auto 1fr; }
  .task-meta { grid-column: 2; justify-self: start; }
  .week-card { grid-template-columns: 48px minmax(0,1fr) auto; gap: 11px; padding: 14px 12px; }
  .week-no { width: 42px; height: 42px; }
  .vocab-item { grid-template-columns: 1fr auto; }
  .vocab-ru { grid-column: 1; }
  .vocab-item .status { grid-column: 2; grid-row: 1 / span 2; }
  .bar-row { grid-template-columns: 85px 1fr 37px; }
  .milestone { grid-template-columns: 22px 85px minmax(0,1fr); gap: 8px; }
}

@media (max-width: 410px) {
  .stats { grid-template-columns: 1fr; }
  .stat { display: flex; justify-content: space-between; align-items: center; }
  .stat span { margin: 0; }
  .vocab-toolbar { grid-template-columns: 1fr; }
  .lesson-vocab { grid-template-columns: 1fr; }
  .install-grid { grid-template-columns: 1fr; }
  .install-grid > span { display: none; }
}