:root {
    --bg-color: var(--tg-theme-bg-color, #f3f4f6);
    --text-color: var(--tg-theme-text-color, #000000);
    --card-bg: var(--tg-theme-secondary-bg-color, #ffffff);
    --btn-bg: var(--tg-theme-button-color, #3390ec);
    --btn-text: var(--tg-theme-button-text-color, #ffffff);
    --hint-color: var(--tg-theme-hint-color, #999999);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 16px;
    padding-top: 70px; /* Отступ под шапку */
}

/* Шапка с профилем */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    background-color: var(--card-bg);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 100;
}
.user-profile { display: flex; align-items: center; gap: 10px; }
.user-profile img {
    width: 36px; height: 36px;
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--hint-color);
}
.user-profile span { font-weight: 600; font-size: 15px; }
.header h1 { font-size: 16px; color: var(--hint-color); }

/* Карточки ДЗ */
#hw-container { display: flex; flex-direction: column; gap: 16px; }
.card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
}
.card h2 {
    font-size: 18px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--bg-color);
    padding-bottom: 8px;
}
.task-item {
    margin-bottom: 12px;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 10px;
}
.task-item:last-child { margin-bottom: 0; }
.task-text { font-size: 15px; margin-bottom: 8px; line-height: 1.4; }
.task-meta { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.diff { color: var(--hint-color); background: var(--card-bg); padding: 4px 8px; border-radius: 6px; }
.gdz-btn {
    text-decoration: none;
    color: var(--btn-text);
    background-color: var(--btn-bg);
    padding: 4px 12px;
    border-radius: 6px;
    font-weight: 500;
}
.empty, .loader { text-align: center; color: var(--hint-color); margin-top: 40px; font-size: 16px; }