.daily-challenge { margin: 0 0 30px; padding: 30px; border-radius: 23px; border: 1px solid rgba(var(--accent-rgb),.24); background: linear-gradient(140deg,rgba(255,255,255,.96),var(--bg)); box-shadow: 0 13px 35px rgba(var(--accent-rgb),.08); position: relative; overflow: hidden; scroll-margin-top: 20px; }
.daily-challenge::before { content: ""; position: absolute; top: 0; left: 28px; right: 28px; height: 2px; background: linear-gradient(90deg,var(--accent),var(--secondary),transparent); }
.daily-heading { display: flex; gap: 22px; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.daily-kicker { color: var(--accent-dark); font-size: .67rem; letter-spacing: .1em; font-weight: 750; display: flex; align-items: center; gap: 7px; }
.daily-kicker > span { font-size: 21px; }
.daily-heading h2 { font-size: 1.75rem; margin: 9px 0; }
.daily-heading p { color: var(--muted); font-size: .83rem; line-height: 1.6; margin: 0; }
.daily-badge { font: 2.3rem Georgia,serif; color: var(--accent); display: flex; align-items: center; gap: 9px; }
.daily-badge span { font: .72rem ui-sans-serif,system-ui,sans-serif; color: var(--muted); }
.daily-level-row { display: flex; align-items: center; gap: 13px; padding: 15px 18px; border-radius: 12px; background: var(--soft); margin: 0 0 24px; }
.daily-level-row label { color: var(--accent-dark); font-size: .8rem; font-weight: 700; }
.daily-level-row select { width: min(320px,100%); min-height: 42px; color: var(--text); background: #fff; border: 1px solid var(--line); border-radius: 9px; padding: 8px 12px; font: inherit; font-size: .83rem; }
.daily-level-row > span { margin-left: auto; color: var(--muted); font-size: .72rem; }
.daily-problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.daily-meta { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; margin-bottom: 16px; }
.daily-meta > span { color: var(--accent-dark); background: var(--soft); padding: 5px 8px; border-radius: 5px; font-size: .68rem; }
.daily-meta > time { font: .66rem ui-monospace,monospace; color: var(--muted); margin-left: 4px; }
.daily-meta > .daily-done { color: #176342; background: #e8f6ef; }
.daily-problem h3 { margin: 0 0 12px; font-size: 1.2rem; line-height: 1.65; font-weight: 680; letter-spacing: -.02em; white-space: pre-wrap; }
.daily-topic { color: var(--muted); font-size: .75rem; }
.daily-hint-toggle { color: var(--accent-dark); padding: 0; margin-top: 16px; border: 0; border-bottom: 1px dashed rgba(var(--accent-rgb),.4); font-size: .75rem; cursor: pointer; background: transparent; }
.daily-hint { padding: 12px; background: var(--soft); color: var(--muted); font-size: .82rem; line-height: 1.7; border-radius: 9px; }
.daily-options { display: grid; gap: 9px; }
.daily-choice { width: 100%; border: 1px solid var(--line); background: #fff; padding: 13px 14px; border-radius: 11px; display: flex; align-items: center; gap: 12px; text-align: left; color: var(--text); font-size: .9rem; cursor: pointer; transition: border-color .15s ease,background .15s ease; min-height: 54px; }
.daily-choice:hover:not(:disabled),.daily-choice.pending { border-color: var(--accent); background: var(--soft); }
.daily-option-letter { width: 25px; height: 25px; display: grid; place-items: center; border-radius: 7px; color: var(--accent-dark); background: var(--soft); font: 700 .7rem ui-monospace,monospace; flex-shrink: 0; }
.daily-choice:disabled { opacity: 1; cursor: default; }
.daily-choice.correct { background: #edf8f1; border-color: #3a9366; color: #185a38; }
.daily-choice.incorrect { background: #fff0ef; border-color: #bc5b56; color: #843b36; }
.daily-choice-mark { margin-left: auto; font-size: 1.1rem; }
.daily-status { color: var(--muted); font-size: .8rem; padding-top: 13px; min-height: 18px; }
.daily-status:empty { display: none; }
.daily-answer { padding: 19px 22px; margin-top: 22px; border-radius: 14px; border: 1px solid #bcdcca; background: #f0faf4; color: #204c34; }
.daily-answer.review { border-color: rgba(var(--accent-rgb),.23); background: var(--soft); color: var(--text); }
.daily-answer-title { display: flex; align-items: center; gap: 10px; font-size: 1rem; }
.daily-answer-title > span { font-size: 1.1rem; }
.daily-answer p { margin: 12px 0; font-size: .85rem; line-height: 1.85; white-space: pre-wrap; }
.daily-answer-key { font-weight: 700; }
.daily-answer small { color: var(--muted); font-size: .72rem; }
.daily-review-link { color: var(--accent-dark); background: transparent; border: 0; font-weight: 650; font-size: .76rem; display: block; margin-top: 13px; padding: 0; cursor: pointer; }
.daily-footer { display: flex; align-items: center; gap: 7px; font-size: .72rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; margin-top: 23px; }
.daily-clock { font-size: 1rem; }
.daily-empty { padding: 22px; color: var(--muted); border: 1px dashed var(--line); border-radius: 13px; font-size: .85rem; }
@media(max-width:780px) { .daily-problem-grid { gap: 22px; } .daily-level-row > span { display: none; } }
@media(max-width:560px) { .daily-challenge { padding: 22px 18px; } .daily-problem-grid { grid-template-columns: 1fr; } .daily-heading { align-items: flex-start; } .daily-heading h2 { font-size: 1.55rem; } .daily-badge { font-size: 1.8rem; } .daily-badge span { display: none; } .daily-level-row { align-items: stretch; flex-direction: column; gap: 8px; } .daily-level-row select { width: 100%; } .daily-answer { padding: 17px; } }