/* --- テーマ変数の定義 --- */
html[data-theme='light'] {
    --background: #f8fafc; /* slate-50 */
    --foreground: #020617; /* slate-950 */
    --card-background: #ffffff;
    --card-hover-background: #f1f5f9; /* slate-100 */
    --border-color: #e2e8f0; /* slate-200 */
    --input-background: #ffffff;
    --input-border-color: #cbd5e1; /* slate-300 */
    --primary-color: #4f46e5; /* indigo-600 */
    --primary-hover-color: #4338ca; /* indigo-700 */
    --muted-foreground: #64748b; /* slate-500 */
    --card-read-background: #eef2ff; /* indigo-50 */
    --card-read-foreground: #3730a3; /* indigo-800 */
    --card-read-muted: #6366f1; /* indigo-500 */
    --card-toread-background: #fefce8; /* yellow-50 */
    --card-toread-foreground: #854d0e; /* yellow-800 */
    --card-toread-muted: #ca8a04; /* yellow-500 */
    --card-skimmed-background: #f0f9ff; /* sky-50 */
    --card-skimmed-foreground: #075985; /* sky-800 */
    --card-skimmed-muted: #0ea5e9; /* sky-500 */
}

html[data-theme='metallic'] {
    --background: #d1d5db; /* gray-300 */
    --foreground: #111827; /* gray-900 */
    --card-background: linear-gradient(145deg, #e5e7eb, #d1d5db);
    --card-hover-background: linear-gradient(145deg, #f3f4f6, #e5e7eb);
    --border-color: #9ca3af; /* gray-400 */
    --input-background: #e5e7eb;
    --input-border-color: #9ca3af;
    --primary-color: #1d4ed8; /* blue-700 */
    --primary-hover-color: #1e40af; /* blue-800 */
    --muted-foreground: #4b5563; /* gray-600 */
    --card-read-background: #dbeafe; /* blue-100 */
    --card-read-foreground: #1e3a8a; /* blue-800 */
    --card-read-muted: #2563eb; /* blue-600 */
    --card-toread-background: #fef3c7; /* amber-100 */
    --card-toread-foreground: #78350f; /* amber-900 */
    --card-toread-muted: #b45309; /* amber-600 */
    --card-skimmed-background: #e0f2fe; /* sky-100 */
    --card-skimmed-foreground: #0c4a6e; /* sky-900 */
    --card-skimmed-muted: #0369a1; /* sky-600 */
}

html[data-theme='snow'] {
    --background: #f7faff;
    --foreground: #334155; /* slate-700 */
    --card-background: #ffffff;
    --card-hover-background: #f0f8ff;
    --border-color: #dbeafe; /* blue-200 */
    --input-background: #ffffff;
    --input-border-color: #93c5fd; /* blue-300 */
    --primary-color: #3b82f6; /* blue-500 */
    --primary-hover-color: #2563eb; /* blue-600 */
    --muted-foreground: #64748b; /* slate-500 */
    --card-read-background: #eff6ff; /* blue-50 */
    --card-read-foreground: #1e40af; /* blue-800 */
    --card-read-muted: #3b82f6; /* blue-500 */
    --card-toread-background: #fefce8; /* yellow-50 */
    --card-toread-foreground: #854d0e; /* yellow-800 */
    --card-toread-muted: #ca8a04; /* yellow-500 */
    --card-skimmed-background: #f0f9ff; /* sky-50 */
    --card-skimmed-foreground: #075985; /* sky-800 */
    --card-skimmed-muted: #0ea5e9; /* sky-500 */
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--foreground);
    transition: background-color 0.3s, color 0.3s;
}

.paper-card.is-read { background: var(--card-read-background); color: var(--card-read-foreground); }
.paper-card.is-read p, .paper-card.is-read span { color: var(--card-read-foreground) !important; }
.paper-card.is-read .text-\[\--muted-foreground\] { color: var(--card-read-muted) !important; }
.paper-card.is-read a { color: var(--card-read-foreground) !important; text-decoration: underline; }
.paper-card.is-read svg { color: var(--card-read-muted) !important; }

.paper-card.is-to-read { background: var(--card-toread-background); color: var(--card-toread-foreground); border-color: var(--card-toread-muted) !important; }
.paper-card.is-to-read p, .paper-card.is-to-read span { color: var(--card-toread-foreground) !important; }
.paper-card.is-to-read .text-\[\--muted-foreground\] { color: var(--card-toread-muted) !important; }
.paper-card.is-to-read a { color: var(--card-toread-foreground) !important; text-decoration: underline; }
.paper-card.is-to-read svg { color: var(--card-toread-muted) !important; }

.paper-card.is-skimmed { background: var(--card-skimmed-background); color: var(--card-skimmed-foreground); }
.paper-card.is-skimmed p, .paper-card.is-skimmed span { color: var(--card-skimmed-foreground) !important; }
.paper-card.is-skimmed .text-\[\--muted-foreground\] { color: var(--card-skimmed-muted) !important; }
.paper-card.is-skimmed a { color: var(--card-skimmed-foreground) !important; text-decoration: underline; }
.paper-card.is-skimmed svg { color: var(--card-skimmed-muted) !important; }

.category-heading {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--foreground);
    font-size: 1.25rem;
    font-weight: 700;
}
.category-heading:first-of-type {
    margin-top: 0;
}

.loader {
    border: 4px solid var(--border-color); border-top: 4px solid var(--primary-color);
    border-radius: 50%; width: 24px; height: 24px; animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.toast {
    visibility: hidden; min-width: 250px; margin-left: -125px; color: #fff;
    text-align: center; border-radius: 8px; padding: 16px; position: fixed;
    z-index: 100; left: 50%; bottom: 30px; opacity: 0;
    transition: visibility 0s, opacity 0.5s linear, transform 0.3s ease-out;
    transform: translateY(20px);
}
.toast.show { visibility: visible; opacity: 1; transform: translateY(0); }
.admin-only { display: none; }

.skeleton-card {
    background-color: var(--card-background); border: 1px solid var(--border-color);
    border-radius: 0.75rem; padding: 1rem;
}
.skeleton {
    opacity: 0.7; animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
    background-color: var(--muted-foreground); border-radius: 0.25rem;
}
@keyframes pulse {
    50% { opacity: .5; }
}

/* --- View Switcher --- */
.view-switch-btn {
    padding: 0.25rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.2s;
    border: 1px solid transparent;
}
.view-switch-btn.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
}
.view-switch-btn:not(.active) {
    color: var(--muted-foreground);
    border: 1px solid var(--border-color);
}
.view-switch-btn:not(.active):hover {
    background-color: var(--card-hover-background);
    color: var(--foreground);
}

/* --- Contribution Graph --- */
#contribution-graph-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
#graph-grid {
    display: grid;
    grid-template-rows: repeat(7, 1fr);
    grid-auto-flow: column;
    grid-auto-columns: minmax(16px, 1fr);
    gap: 4px;
}
.graph-day {
    aspect-ratio: 1 / 1;
    background-color: var(--border-color);
    border-radius: 3px;
}
.graph-day.level-4 { background-color: var(--primary-color); }

#graph-days {
     height: calc(7 * 16px + 6 * 4px); /* (block_height * 7) + (gap * 6) */
}
#graph-days span {
    display: flex;
    align-items: center;
}

/* --- Stats Card --- */
.stat-card {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem;
    text-align: center;
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
}
.stat-card-count {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}
.stat-card-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--muted-foreground);
    margin-top: 0.5rem;
    word-break: break-all;
}
.theme-option {
    color: var(--foreground); display: block; padding: 8px 16px; font-size: 14px;
}
.theme-option:hover {
    background-color: var(--card-hover-background);
}
.theme-option.active {
    font-weight: 600; color: var(--primary-color);
}

/* --- Responsive Header for Mobile --- */
@media (max-width: 767px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    header > div {
        width: 100%;
    }

    header > div:first-child {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    header > div:last-child {
        display: flex;
        justify-content: flex-end;
        align-items: center;
    }

    /* Adjust title size */
    header h1.text-3xl {
        font-size: 1.5rem; /* = text-2xl */
    }

    /* Adjust button sizes */
    #login-btn, #logout-btn {
        padding: 0.5rem 0.75rem; /* py-2 px-3 */
        font-size: 0.875rem; /* text-sm */
    }
}