/* ===========================================
   TechDive - Clean & Cute Design System
   GitHub/Notion inspired, with subtle playfulness
   =========================================== */

/* CSS Custom Properties (Design Tokens) */
:root {
    /* Colors - Light theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-bg-tertiary: #f0f2f5;
    --color-border: #d1d9e0;
    --color-border-light: #e8eaed;

    --color-text-primary: #1f2328;
    --color-text-secondary: #4b5563;
    --color-text-muted: #6b7280;

    --color-accent: #0969da;
    --color-accent-hover: #0550ae;
    --color-accent-subtle: #ddf4ff;

    --color-success: #1a7f37;
    --color-success-subtle: #dafbe1;
    --color-warning: #9a6700;
    --color-warning-subtle: #fff8c5;
    --color-danger: #d1242f;
    --color-danger-subtle: #ffebe9;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;

    /* Border radius - slightly rounded for friendliness */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    /* Shadows - soft and subtle */
    --shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.04);
    --shadow-md: 0 3px 6px rgba(31, 35, 40, 0.06), 0 2px 4px rgba(31, 35, 40, 0.04);
    --shadow-lg: 0 8px 24px rgba(31, 35, 40, 0.08);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 0.9rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-top: 0;
    margin-bottom: var(--space-3);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.375rem; }
h3 { font-size: 1.125rem; }

h1:focus { outline: none; }

p {
    margin-top: 0;
    margin-bottom: var(--space-3);
}

/* Links */
a, .btn-link {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover, .btn-link:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus {
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
    outline: none;
}

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

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-outline-secondary {
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    border-color: var(--color-border);
}

.btn-outline-secondary:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-border);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-sm);
}

/* Form Controls */
.form-control, .form-select {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-base);
    font-family: inherit;
    line-height: 1.5;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus, .form-select:focus, .form-check-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
    outline: none;
}

.form-control-sm, .form-select-sm {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-sm);
}

.form-label {
    display: block;
    margin-bottom: var(--space-1);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin-top: 0.125rem;
    vertical-align: top;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.form-check-input:checked {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.darker-border-checkbox.form-check-input {
    border-color: var(--color-border);
}

/* Validation states */
.valid.modified:not([type=checkbox]) {
    border-color: var(--color-success);
}

.invalid {
    border-color: var(--color-danger);
}

.validation-message {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--space-1);
}

/* Cards */
.card {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-body {
    padding: var(--space-5);
}

.card-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

/* Alerts */
.alert {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
}

.alert-info {
    color: var(--color-accent);
    background-color: var(--color-accent-subtle);
    border-color: var(--color-accent);
}

.alert-success {
    color: var(--color-success);
    background-color: var(--color-success-subtle);
    border-color: var(--color-success);
}

.alert-warning {
    color: var(--color-warning);
    background-color: var(--color-warning-subtle);
    border-color: var(--color-warning);
}

.alert-danger {
    color: var(--color-danger);
    background-color: var(--color-danger-subtle);
    border-color: var(--color-danger);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge.bg-primary { background-color: var(--color-accent) !important; }
.badge.bg-secondary {
    background-color: var(--color-bg-tertiary) !important;
    color: var(--color-text-secondary) !important;
}
.badge.bg-success { background-color: var(--color-success) !important; }
.badge.bg-danger { background-color: var(--color-danger) !important; }
.badge.bg-warning {
    background-color: var(--color-warning-subtle) !important;
    color: var(--color-warning) !important;
}
.badge.bg-dark {
    background-color: var(--color-text-secondary) !important;
}
.badge.bg-light {
    background-color: var(--color-bg-secondary) !important;
    color: var(--color-text-secondary) !important;
}

/* List Group */
.list-group {
    display: flex;
    flex-direction: column;
    gap: 1px;
    background-color: var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.list-group-item {
    background-color: var(--color-bg-primary);
    padding: var(--space-4);
    border: none;
    transition: background-color var(--transition-fast);
}

.list-group-item:hover {
    background-color: var(--color-bg-secondary);
}

.list-group-flush {
    border-radius: 0;
    background-color: transparent;
}

.list-group-flush .list-group-item {
    border-bottom: 1px solid var(--color-border-light);
}

.list-group-flush .list-group-item:last-child {
    border-bottom: none;
}

/* Progress bars */
.progress {
    height: 8px;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    background-color: var(--color-accent);
    transition: width var(--transition-normal);
}

.progress-bar.bg-success {
    background-color: var(--color-success) !important;
}

/* Pagination */
.pagination {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--space-1);
}

.page-item .page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 var(--space-2);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.page-item .page-link:hover {
    background-color: var(--color-bg-secondary);
    border-color: var(--color-border);
}

.page-item.active .page-link {
    color: #fff;
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.page-item.disabled .page-link {
    color: var(--color-text-muted);
    pointer-events: none;
    background-color: var(--color-bg-secondary);
}

/* Spinner */
.spinner-border {
    border-color: var(--color-accent);
    border-right-color: transparent;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 2px;
}

/* Content area */
.content {
    padding-top: var(--space-4);
}

/* Lead text */
.lead {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* Error boundary */
.blazor-error-boundary {
    background: var(--color-danger-subtle);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-danger);
    color: var(--color-danger);
}

.blazor-error-boundary::after {
    content: "An error has occurred.";
}

/* Utility - Text colors */
.text-muted { color: var(--color-text-muted) !important; }
.text-secondary { color: var(--color-text-secondary) !important; }
.text-info { color: var(--color-accent) !important; }
.text-success { color: var(--color-success) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-warning { color: var(--color-warning) !important; }

/* Utility - Small text */
.small, small {
    font-size: var(--font-size-sm);
}

/* Cute micro-interactions */
@keyframes gentle-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-2px); }
}

.badge:hover {
    animation: gentle-bounce 0.3s ease;
}

/* Smooth transitions for interactive elements */
button, a, .btn, .form-control, .form-select, .badge, .card {
    transition: all var(--transition-fast);
}

/* Focus visible for accessibility */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ===========================================
   Article List Specific Styles
   =========================================== */

/* Article item animation */
.article-item {
    animation: slideIn 0.3s ease-out;
    overflow-x: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.article-item p {
    word-break: break-all;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Score bar */
.score-bar {
    height: 6px;
    border-radius: var(--radius-full);
    background-color: var(--color-bg-tertiary);
    overflow: hidden;
}

.score-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

/* Score grid */
.score-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-1);
    font-size: var(--font-size-sm);
}

/* Time info */
.time-info {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Collection status card */
.collection-status-card {
    overflow-x: hidden;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Article title link */
.article-item a.fw-bold {
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

.article-item a.fw-bold:hover {
    color: var(--color-accent);
}

/* Article summary - readable size */
.article-summary {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* Article metadata row */
.article-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.article-meta .badge {
    font-size: var(--font-size-xs);
}

/* ===========================================
   Weekly Summary Page Styles
   =========================================== */

/* Category columns */
.category-column {
    min-height: 400px;
    max-height: 900px;
    display: flex;
    flex-direction: column;
}

.category-articles {
    flex: 1;
    overflow-y: auto;
    padding-right: var(--space-2);
}

/* Category scrollbar */
.category-articles::-webkit-scrollbar {
    width: 6px;
}

.category-articles::-webkit-scrollbar-track {
    background: transparent;
}

.category-articles::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: var(--radius-full);
}

/* Load more button */
.load-more-btn {
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
    text-align: center;
}

/* Category headers */
.category-header {
    border-bottom: 3px solid;
    padding-bottom: var(--space-2);
    margin-bottom: var(--space-4);
}

.category-news .category-header { border-color: var(--color-danger); }
.category-tech .category-header { border-color: var(--color-accent); }
.category-academic .category-header { border-color: var(--color-success); }

/* Trend tags */
.trend-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
    margin-bottom: var(--space-4);
}

.trend-tag {
    font-size: var(--font-size-sm);
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    background-color: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-fast);
}

.trend-tag:hover {
    background-color: var(--color-bg-tertiary);
}

/* Weekly article item */
.category-articles .article-item {
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border-light);
    animation: none;
}

.category-articles .article-item:last-child {
    border-bottom: none;
}

.category-articles .article-item:hover {
    background-color: var(--color-bg-secondary);
    margin: 0 calc(-1 * var(--space-2));
    padding-left: var(--space-2);
    padding-right: var(--space-2);
    border-radius: var(--radius-md);
}

.article-title {
    font-size: var(--font-size-base);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--color-text-primary);
}

.article-title:hover {
    color: var(--color-accent);
}

.article-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* Summary card */
.summary-card {
    border-left: 4px solid var(--color-accent);
    background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-primary));
}

.summary-content {
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

.summary-content a {
    color: var(--color-accent);
    text-decoration: none;
}

.summary-content a:hover {
    text-decoration: underline;
}

.summary-content h2, .summary-content h3 {
    font-size: var(--font-size-md);
    margin-top: var(--space-3);
    margin-bottom: var(--space-2);
}

.summary-content ul, .summary-content ol {
    margin-bottom: var(--space-2);
    padding-left: var(--space-5);
}

.summary-content li {
    margin-bottom: var(--space-1);
}

.summary-content p {
    margin-bottom: var(--space-2);
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--space-6);
    color: var(--color-text-muted);
}

/* History navigation */
.history-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.history-nav .btn {
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-base);
}

.history-badge {
    font-size: var(--font-size-sm);
    padding: 2px var(--space-2);
    border-radius: var(--radius-sm);
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
}

.history-badge.latest {
    background-color: var(--color-success-subtle);
    color: var(--color-success);
}

/* ===========================================
   Table Styles
   =========================================== */

.table {
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.table thead th {
    background-color: var(--color-bg-secondary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    text-align: left;
}

.table tbody td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: middle;
}

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

.table tbody tr:hover {
    background-color: var(--color-bg-secondary);
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: transparent;
}

.table-striped tbody tr:nth-of-type(odd):hover {
    background-color: var(--color-bg-secondary);
}

/* ===========================================
   Input Group
   =========================================== */

.input-group {
    display: flex;
    align-items: stretch;
}

.input-group > .form-control {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    border-right: none;
}

.input-group > .btn {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}