:root {
    --bg: #16241d;
    --surface: #1f322a;
    --edge: rgba(242, 243, 238, 0.14);
    --rule: rgba(242, 243, 238, 0.18);
    --rule-strong: rgba(242, 243, 238, 0.34);
    --chalk: #f2f3ee;
    --chalk-dim: #9fb3a6;
    --chalk-yellow: #f2c94c;
    --chalk-yellow-dim: rgba(242, 201, 76, 0.22);
    --chalk-pink: #e78fa6;
    --chalk-red: #e2694f;
    --row-alt: rgba(242, 243, 238, 0.045);

    --font-display: 'Caveat', cursive;
    --font-body: 'Work Sans', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background-color: var(--bg);
    background-image:
        radial-gradient(ellipse at 15% 0%, rgba(242, 243, 238, 0.05), transparent 55%),
        radial-gradient(ellipse at 85% 100%, rgba(242, 201, 76, 0.05), transparent 55%);
    color: var(--chalk);
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: var(--font-body);
    padding: 2rem 1rem 4rem;
}

.brand {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--chalk-yellow);
    margin: 0 0 1.5rem;
}

.page {
    width: 100%;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--edge);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
    border-radius: 10px;
    padding: 1.6rem 1.4rem 1.5rem;
}

.panel-header {
    text-align: center;
}

.panel-header--left {
    text-align: left;
}

.panel-caption {
    margin: 0.2rem 0 0;
    font-size: 0.85rem;
    color: var(--chalk-dim);
}

.panel-title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.9rem;
    color: var(--chalk);
}

#dateDisplay {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2.6rem;
    line-height: 1.1;
    color: var(--chalk-yellow);
}

.rule {
    border: none;
    border-top: 1px dashed var(--rule-strong);
    margin: 1rem 0 1.25rem;
}

.picker-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

#text {
    color: var(--chalk-dim);
    font-size: 0.9rem;
}

input[type=date] {
    padding: 0.5rem 0.7rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--chalk);
    border: 1px solid var(--edge);
    border-radius: 6px;
    accent-color: var(--chalk-yellow);
    background-color: rgba(242, 243, 238, 0.06);
    color-scheme: dark;
}

input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1) opacity(0.7);
    cursor: pointer;
}

input[type="date"]:focus-visible,
input[type="date"]:focus {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
    border-color: var(--chalk-yellow);
}

.secondary-btn {
    display: block;
    width: 100%;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--chalk);
    background: transparent;
    border-radius: 6px;
    border: 1px dashed var(--rule-strong);
    padding: 0.6rem 0.8rem;
    margin-bottom: 1.4rem;
    cursor: pointer;
    transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.secondary-btn:hover {
    border-color: var(--chalk-yellow);
    color: var(--chalk-yellow);
}

.secondary-btn.is-active {
    background: var(--chalk-yellow-dim);
    border-style: solid;
    border-color: var(--chalk-yellow);
    color: var(--chalk-yellow);
}

.secondary-btn:focus-visible {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    text-align: left;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--chalk-dim);
    padding: 0 0.6rem 0.6rem;
    border-bottom: 1px solid var(--rule-strong);
}

th:first-child,
td:first-child {
    width: 3.2rem;
}

tbody td {
    padding: 0.72rem 0.6rem;
    border-bottom: 1px dashed var(--rule);
    font-size: 0.94rem;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:nth-child(even) td {
    background-color: var(--row-alt);
}

tbody tr:hover td {
    background-color: var(--chalk-yellow-dim);
}

tbody td:first-child {
    font-family: var(--font-mono);
    color: var(--chalk-yellow);
    font-weight: 500;
}

tbody td[colspan] {
    text-align: center;
    padding: 1.3rem 0.6rem;
    color: var(--chalk-dim);
    font-style: italic;
}

.add-subject-form {
    display: flex;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.add-subject-form input[type="text"] {
    flex: 1;
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--chalk);
    background-color: rgba(242, 243, 238, 0.06);
    border: 1px solid var(--edge);
    border-radius: 6px;
    padding: 0.55rem 0.7rem;
}

.add-subject-form input[type="text"]::placeholder {
    color: var(--chalk-dim);
}

.add-subject-form input[type="text"]:focus-visible,
.add-subject-form input[type="text"]:focus {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
    border-color: var(--chalk-yellow);
}

.primary-btn {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: #16241d;
    background-color: var(--chalk-yellow);
    border: none;
    border-radius: 6px;
    padding: 0 1rem;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.primary-btn:hover {
    opacity: 0.85;
}

.primary-btn:focus-visible {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
}

.subject-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}

.empty-state {
    color: var(--chalk-dim);
    font-size: 0.9rem;
    font-style: italic;
    text-align: center;
    padding: 1rem 0;
}

.subject-card {
    border: 1px solid var(--edge);
    border-radius: 6px;
    padding: 0.9rem 1rem;
    background-color: rgba(242, 243, 238, 0.02);
}

.subject-card__top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.6rem;
}

.subject-card__name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--chalk-dim);
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.1rem 0.3rem;
}

.icon-btn:hover {
    color: var(--chalk-red);
}

.icon-btn:focus-visible {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
}

.subject-card__status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    flex-wrap: wrap;
    padding-top: 0.6rem;
    border-top: 1px dashed var(--rule);
}

.status-text {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--chalk-dim);
}

.check-btn {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--chalk-pink);
    background: rgba(231, 143, 166, 0.16);
    border: none;
    border-radius: 5px;
    padding: 0.35rem 0.6rem;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.check-btn:hover {
    opacity: 0.8;
}

.check-btn:focus-visible {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
}

.subject-card__note {
    margin-top: 0.6rem;
}

.subject-card__note summary {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--chalk-dim);
    cursor: pointer;
}

.subject-card__note summary:hover {
    color: var(--chalk);
}

.note-input {
    width: 100%;
    min-height: 4.5rem;
    margin-top: 0.6rem;
    resize: vertical;
    font-family: var(--font-body);
    font-size: 0.88rem;
    color: var(--chalk);
    background-color: rgba(242, 243, 238, 0.05);
    border: 1px solid var(--edge);
    border-radius: 6px;
    padding: 0.55rem 0.7rem;
}

.note-input::placeholder {
    color: var(--chalk-dim);
}

.note-input:focus-visible,
.note-input:focus {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
    border-color: var(--chalk-yellow);
}

.save-note-btn {
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--chalk);
    background: transparent;
    border: 1px dashed var(--rule-strong);
    border-radius: 5px;
    padding: 0.35rem 0.6rem;
    cursor: pointer;
}

.save-note-btn:hover {
    border-color: var(--chalk-yellow);
    color: var(--chalk-yellow);
}

.save-note-btn:focus-visible {
    outline: 2px solid var(--chalk-yellow);
    outline-offset: 2px;
}

@media (max-width: 400px) {
    #dateDisplay {
        font-size: 2.1rem;
    }

    .panel {
        padding: 1.25rem 1rem 1.2rem;
    }

    .picker-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .subject-card__status {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}