:root {
    --bg: #f6f7fb;
    --card: #ffffff;
    --text: #222;
    --muted: #666;
    --primary: #5c6ac4;
    --accent: #7c3aed;
    --border: #e5e7eb;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

header {
    padding: 16px 24px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 5;
}

h1 {
    font-size: 40px;
    margin: 0 0 8px;
}

.filters {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

select,
button {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    color: var(--text);
}

button.primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

button.accent {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

main {
    max-width: 1100px;
    margin: 16px auto;
    padding: 0 16px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    background: var(--card);
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.weekday {
    text-align: center;
    font-weight: 600;
    color: var(--muted);
    padding: 6px 0;
}

.day {
    min-height: 92px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px;
    position: relative;
    cursor: pointer;
    transition: outline 140ms ease;
}

.day:hover {
    outline: 2px solid rgba(92, 106, 196, 0.25);
}

.day-number {
    font-weight: 600;
    color: var(--muted);
}

/* .emoji-mark {
    position: absolute;
    bottom: 6px;
    right: 6px;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    font-size: 20px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
} */

.emoji-mark {
    position: absolute;
    bottom: 6px;
    right: 6px;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    font-size: 20px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    background: var(--accent-color, #d0a6ff); /* giữ màu nền nếu có */
    
    /* Quan trọng: Thu nhỏ emoji trên màn hình nhỏ */
    @media (max-width: 480px) {
        width: 100%;
        max-width: 32px;
        font-size: 18px;
        bottom: 4px;
        right: 4px;
    }

    @media (max-width: 360px) {
        width: 100%;
        max-width: 28px;
        font-size: 16px;
        bottom: 4px;
        right: 4px;
    }
}

.legend {
    display: flex;
    flex-wrap: wrap;
    padding: 0 30px;
    gap: 8px;
    margin-top: 12px;
    color: var(--muted);
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
}

.legend-dot {
    width: 14px;
    height: 14px;
    border-radius: 999px;
    display: inline-block;
}

/* Tooltip ghi chú trong ô ngày */
.day {
    position: relative;
}

.note-indicator {
    position: absolute;
    bottom: 6px;
    left: 6px;
    width: 10px;
    height: 10px;
    border-radius: 999px;
    background: #7c3aed;
    /* cùng tone với --accent */
    opacity: 0.65;
}

.note-tooltip {
    position: absolute;
    left: 6px;
    bottom: 28px;
    /* trên chấm note-indicator */
    max-width: 260px;
    background: #111827;
    /* nền đậm */
    color: #f9fafb;
    /* chữ sáng */
    border-radius: 8px;
    padding: 8px 10px;
    font-size: 12px;
    line-height: 1.4;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: none;
    /* chỉ hiện khi hover */
    z-index: 3;
    white-space: normal;
}

.note-tooltip::after {
    content: "";
    position: absolute;
    left: 10px;
    bottom: -6px;
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid #111827;
}

.day:hover .note-tooltip {
    display: block;
}

.day[style*="visibility:hidden"] .note-tooltip {
    display: none !important;
}

/* Modal */
.backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: none;
    place-items: center;
    z-index: 50;
}

.modal {
    width: 480px;
    max-width: calc(100vw - 32px);
    background: #fff;
    border-radius: 12px;
    padding: 14px 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
}

.modal h2 {
    margin-top: 4px;
    font-size: 18px;
}

.moods {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 8px;
}

/* Hiệu ứng chọn cảm xúc trong popup */
.mood {
    border-radius: 12px;
    padding: 10px;
    display: grid;
    place-items: center;
    cursor: pointer;
    border: 2px solid transparent;
    min-height: 70px;
    transition: transform 140ms ease, box-shadow 140ms ease, opacity 140ms ease, border-color 140ms ease;
}

.mood .emoji {
    font-size: 28px;
}

/* Nổi bật khi được chọn */
.mood.active {
    transform: scale(1.06);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
    border-color: rgba(0, 0, 0, 0.25);
    opacity: 1;
}

/* Giảm nổi bật cho các mood không được chọn */
.mood.dimmed {
    opacity: 0.45;
    box-shadow: none;
    border-color: transparent;
}

.mood.dimmed:hover {
    opacity: 0.7;
    transform: scale(1.02);
}

.mood:focus-visible {
    outline: 3px solid rgba(124, 58, 237, 0.55);
    /* dùng tone --accent */
}

.modal textarea {
    width: 100%;
    min-height: 80px;
    margin-top: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px;
    resize: vertical;
}

.modal .actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 10px;
}

/* Stats */
.stats-card {
    margin-top: 18px;
    background: var(--card);
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    position: relative;
}

.stats-filters {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

canvas {
    width: 100%;
    max-width: 960px;
    height: 260px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.notice {
    font-size: 13px;
    color: var(--muted);
}

/* Ẩn nút refresh vì đã auto-update thống kê */
#refreshStats {
    display: none;
}

/* Hover panel (bảng liệt kê ngày/tháng theo cảm xúc khi hover cột) */
.hover-panel {
    position: fixed;
    /* Đổi từ absolute sang fixed để theo màn hình */
    width: 340px;
    max-height: 350px;
    overflow-y: auto;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.14);
    padding: 10px 12px;
    display: none;
    z-index: 20;
    pointer-events: auto;
    /* Cho phép scroll */
    font-size: 13px;
}

.hover-panel h3 {
    margin: 0 0 8px;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hover-panel .badge {
    display: inline-grid;
    place-items: center;
    width: 24px;
    height: 24px;
    border-radius: 6px;
    font-size: 16px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.hover-panel .month {
    margin: 8px 0 4px;
    font-weight: 600;
    color: var(--muted);
}

.hover-panel ul {
    margin: 0;
    padding-left: 18px;
}

.hover-panel li {
    margin-bottom: 4px;
    font-size: 13px;
    color: #1f2937;
}

.hover-panel .empty {
    color: var(--muted);
    font-size: 13px;
}