.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.card-pad { padding: clamp(1rem, 2vw, 1.35rem); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 42px; padding: .65rem 1rem; border: 1px solid transparent; border-radius: .85rem; font-weight: 800; cursor: pointer; text-decoration: none; transition: var(--transition); }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn-primary { background: var(--primary); color: white; }
.btn-secondary { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.icon-btn { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 50%; background: var(--surface); color: var(--text); cursor: pointer; }
.badge { display: inline-flex; align-items: center; gap: .3rem; padding: .28rem .62rem; border-radius: var(--radius-pill); background: var(--surface-2); color: var(--text-soft); font-size: .78rem; font-weight: 800; }
.pill-row { display: flex; flex-wrap: wrap; gap: .5rem; }
.lesson-card { position: relative; overflow: hidden; padding: 1.2rem; min-height: 210px; display: flex; flex-direction: column; border-top: 5px solid var(--lesson-color, var(--primary)); }
.lesson-card::after { content: attr(data-icon); position: absolute; right: .8rem; bottom: -.35rem; z-index: 0; font-size: 5.5rem; opacity: .09; pointer-events: none; }
.lesson-card > * { position: relative; z-index: 1; }
.lesson-card h3 { font-size: 1.3rem; }
.lesson-card p { color: var(--text-soft); }
.lesson-card .lesson-footer { margin-top: auto; display: flex; align-items: center; justify-content: space-between; gap: .75rem; }
.progress-track { height: 10px; border-radius: var(--radius-pill); background: var(--surface-2); overflow: hidden; }
.progress-fill { height: 100%; width: var(--progress, 0%); border-radius: inherit; background: linear-gradient(90deg, var(--primary), var(--teal)); transition: width .35s ease; }
.stat-card { padding: 1rem; display: flex; gap: .85rem; align-items: center; }
.stat-icon { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; background: var(--primary-soft); font-size: 1.5rem; }
.stat-value { font-size: 1.5rem; font-weight: 900; }
.stat-label { color: var(--text-soft); font-size: .85rem; }
.filter-bar { display: flex; flex-wrap: wrap; gap: .75rem; padding: 1rem; margin-bottom: 1rem; }
.filter-bar input, .filter-bar select { min-height: 42px; padding: .6rem .8rem; color: var(--text); background: var(--surface-2); border: 1px solid var(--border); border-radius: .8rem; }
.filter-bar input { flex: 1 1 260px; }
.callout { padding: 1rem 1.1rem; border-left: 5px solid var(--primary); border-radius: 0 var(--radius-md) var(--radius-md) 0; background: var(--primary-soft); }
.callout.warning { border-color: var(--accent); background: var(--surface-3); }
.chips { display: flex; flex-wrap: wrap; gap: .45rem; }
.chip { padding: .36rem .65rem; border-radius: var(--radius-pill); border: 1px solid var(--border); background: var(--surface); font-weight: 700; }
.tabs { display: flex; gap: .35rem; overflow-x: auto; padding-bottom: .35rem; margin-bottom: 1rem; }
.tab { white-space: nowrap; border: 1px solid var(--border); border-radius: var(--radius-pill); padding: .55rem .9rem; background: var(--surface); color: var(--text-soft); font-weight: 800; cursor: pointer; }
.tab.active { background: var(--primary); color: white; border-color: var(--primary); }
.example-sentence { font-size: 1.08rem; padding: .85rem 1rem; border-radius: .85rem; background: var(--surface-2); }
.highlight { padding: .08rem .28rem; border-radius: .35rem; background: #fde68a; color: #713f12; font-weight: 900; }
.quiz-option { width: 100%; text-align: left; padding: .9rem 1rem; border: 1px solid var(--border); border-radius: .9rem; background: var(--surface); color: var(--text); cursor: pointer; }
.quiz-option:hover { border-color: var(--primary); }
.quiz-option.selected { border-color: var(--primary); background: var(--primary-soft); }
.quiz-option.correct { border-color: var(--success); background: color-mix(in srgb, var(--success) 14%, var(--surface)); }
.quiz-option.incorrect { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 14%, var(--surface)); }
.quiz-options { display: grid; gap: .65rem; margin: 1rem 0; }
.toast { position: fixed; z-index: 500; right: 1rem; bottom: 1rem; max-width: 360px; padding: .9rem 1rem; border-radius: 1rem; background: var(--text); color: var(--surface); box-shadow: var(--shadow-md); animation: toast-in .2s ease; }
@keyframes toast-in { from { transform: translateY(20px); opacity: 0; } }
.modal-backdrop { position: fixed; inset: 0; z-index: 300; display: grid; place-items: start center; padding: 8vh 1rem 1rem; background: rgba(4, 10, 30, .65); }
.modal { width: min(780px, 100%); max-height: 80vh; overflow: auto; background: var(--surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.modal-head { position: sticky; top: 0; display: flex; gap: .75rem; align-items: center; padding: 1rem; background: var(--surface); border-bottom: 1px solid var(--border); }
.modal-head input { flex: 1; min-height: 44px; padding: .65rem .85rem; border: 1px solid var(--border); border-radius: .8rem; background: var(--surface-2); color: var(--text); }
.search-result { display: block; padding: .9rem 1rem; color: var(--text); text-decoration: none; border-bottom: 1px solid var(--border); }
.search-result:hover { background: var(--surface-2); }
.empty-state { padding: 2.5rem 1rem; text-align: center; color: var(--text-soft); }

.btn-danger { background: color-mix(in srgb, var(--danger) 12%, var(--surface)); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 38%, var(--border)); }
.level-selector { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .65rem; }
.level-button { min-height: 92px; padding: .75rem; border: 1px solid var(--border); border-radius: 1rem; background: var(--surface); color: var(--text); text-align: left; cursor: pointer; transition: var(--transition); }
.level-button:hover { border-color: var(--primary); transform: translateY(-1px); }
.level-button.active { border-color: var(--primary); background: var(--primary-soft); box-shadow: inset 0 0 0 1px var(--primary); }
.level-button strong, .level-button span { display: block; }
.level-button span { color: var(--text-soft); font-size: .78rem; margin-top: .2rem; }
.level-best { margin-top: .4rem; font-size: .74rem; font-weight: 900; color: var(--primary-strong); }
.level-dots { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .5rem; }
.level-dot { min-width: 32px; height: 28px; display: inline-grid; place-items: center; padding-inline: .35rem; border-radius: var(--radius-pill); background: var(--surface-2); border: 1px solid var(--border); font-size: .72rem; font-weight: 900; }
.level-dot.mastered { background: color-mix(in srgb, var(--success) 15%, var(--surface)); border-color: var(--success); color: var(--success); }
.confirm-box { padding: 1.2rem; }