/* ===== Theme Variables ===== */
/* GitHub Dark High Contrast (default) */
:root {
    --bg-canvas: #010409;
    --bg-surface: #0d1117;
    --bg-surface-hover: #161b22;
    --bg-inset: #010409;
    --border: #ffffff;
    --border-emphasis: #ffffff;
    --text-primary: #ffffff;
    --text-secondary: #e0e4e8;
    --text-muted: #b0b8c1;
    --link: #71b7ff;
    --link-hover: #409eff;
    --accent-blue: #409eff;
    --accent-green: #26a148;
    --accent-red: #da3633;
    --btn-bg: #21262d;
    --btn-hover: #30363d;
    --btn-primary: #1f6feb;
    --btn-primary-hover: #388bfd;
    --btn-danger: #da3633;
    --btn-danger-hover: #b62324;
    --nav-bg: #0d1117;
    --card-bg: #0d1117;
    --input-bg: #161b22;
    --overlay: rgba(1, 4, 9, 0.8);
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --code-bg: #161b22;
    --success-bg: #0d2818;
    --success-border: #196c2e;
    --success-text: #3fb950;
    --error-bg: #2d1115;
    --error-border: #6e2b2b;
    --error-text: #f85149;
    color-scheme: dark;
}

/* GitHub Light High Contrast */
[data-theme="light"] {
    --bg-canvas: #ffffff;
    --bg-surface: #f6f8fa;
    --bg-surface-hover: #eaeef2;
    --bg-inset: #eff2f5;
    --border: #000000;
    --border-emphasis: #000000;
    --text-primary: #0e1116;
    --text-secondary: #32383f;
    --text-muted: #59636e;
    --link: #0349b4;
    --link-hover: #0969da;
    --accent-blue: #0969da;
    --accent-green: #1a7f37;
    --accent-red: #cf222e;
    --btn-bg: #e8ecf0;
    --btn-hover: #d1d9e0;
    --btn-primary: #0969da;
    --btn-primary-hover: #0860ca;
    --btn-danger: #cf222e;
    --btn-danger-hover: #a40e26;
    --nav-bg: #ffffff;
    --card-bg: #ffffff;
    --input-bg: #f6f8fa;
    --overlay: rgba(31, 35, 40, 0.5);
    --shadow: 0 1px 3px rgba(31,35,40,0.12);
    --code-bg: #eff2f5;
    --success-bg: #dafbe1;
    --success-border: #82e596;
    --success-text: #1a7f37;
    --error-bg: #ffebe9;
    --error-border: #ff8182;
    --error-text: #cf222e;
    color-scheme: light;
}

/* ===== Reset ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== Base ===== */
body {
    background-color: var(--bg-canvas);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    overscroll-behavior-y: none;
    transition: background-color 0.2s, color 0.2s;
}

a {
    color: var(--link);
    text-decoration: none;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* ===== Container ===== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Box (generic surface) ===== */
.box {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 20px;
    margin-bottom: 0;
    border-radius: 0;
}

/* ===== Navigation ===== */
nav {
    background-color: var(--nav-bg);
    border: 1px solid var(--border);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 50;
}

nav:has(+ .admin-bar) {
    margin-bottom: 0;
}

.admin-bar {
    border-top: none;
}

nav .nav-content {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    max-width: 800px;
    margin: 0 auto;
}

nav .logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    padding: 10px 16px;
}

nav .logo:hover {
    background-color: var(--bg-surface-hover);
    text-decoration: none;
}

@media (max-width: 600px) {
    nav .logo {
        display: none;
    }
}

nav .nav-links {
    display: flex;
    gap: 0;
    align-items: stretch;
    flex: 1;
}

nav .nav-links a,
nav .nav-links .theme-toggle,
nav .nav-links .lang-btn,
nav .nav-links .nav-logout-btn {
    color: var(--text-primary);
    padding: 0px 0px;
    border: none;
    border-radius: 0;
    border-right: none;
    font-size: clamp(0.7rem, 2.4cqi, 1.1rem);
    font-weight: 500;
    background: none;
    cursor: pointer;
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    transition: background-color 0.15s;
    text-decoration: none;
    white-space: nowrap;
}
nav .nav-links > *:first-child {
    border-left: none;
}

nav .nav-links a:hover,
nav .nav-links .theme-toggle:hover,
nav .nav-links .lang-btn:hover,
nav .nav-links .nav-logout-btn:hover {
    background-color: var(--bg-surface-hover);
    text-decoration: none;
}

/* Theme toggle */
.theme-toggle {
    color: var(--text-secondary) !important;
    font-size: 1rem !important;
    line-height: 1;
}

.theme-toggle:hover {
    color: var(--text-primary) !important;
}

/* Language dropdown */
.lang-dropdown {
    position: relative;
    display: flex;
}

.lang-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    background: var(--card-bg);
    border: none;
    border: 1px solid var(--border);
    border-radius: 0;
    z-index: 100;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.lang-menu.show {
    display: block;
}

.lang-menu a {
    display: block;
    padding: 8px 16px;
    color: var(--text-primary);
    text-decoration: none;
    white-space: nowrap;
    font-size: 0.9rem;
    transition: background-color 0.15s;
}

.lang-menu a:hover {
    background-color: var(--bg-surface-hover);
}

.lang-menu a.active {
    background-color: var(--bg-surface-hover);
    font-weight: 600;
}

/* ===== Quick Actions Grid ===== */
.quick-actions-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 20px;
}

@media (min-width: 300px) {
    .quick-actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 800px) {
    .quick-actions-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===== Header ===== */
header {
    margin-bottom: 20px;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 10px;
    letter-spacing: -0.02em;
}

/* Compact header */
.compact-header {
    padding: 16px 20px;
    margin-bottom: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: none;
}

.compact-header h1 {
    font-size: 1.25rem;
    margin-bottom: 0;
    font-weight: 600;
}

/* Chat history separator */
.chat-history-separator {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    padding: 8px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin: 8px 0;
}

/* ===== Border overlap prevention ===== */
/* Adjacent boxes: remove double border between them */
.box + .box,
.box + .post-list,
.box + .report-tabs,
.post-list + .box,
.post-content + .box {
    border-top: none;
}

/* First post-item in list directly after a box: top border already provided by box's bottom */
.box + .post-list > .post-item:first-child {
    border-top: none;
}

/* Home section: post-list directly under section-header */
.home-section-header + .post-list > .post-item:first-child {
    border-top: none;
}


/* ===== Report Tabs ===== */
.report-tabs {
    display: flex;
    border: 1px solid var(--border);
    border-bottom: none;
}

.report-tab {
    flex: 1;
    padding: 10px 16px;
    background: var(--bg-surface);
    color: var(--text-muted);
    border: none;
    border-bottom: 1px solid transparent;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    transition: background-color 0.15s, color 0.15s;
}

.report-tab:not(:first-child) {
    border-left: 1px solid var(--border);
}

.report-tab:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
}

.report-tab.active {
    background: var(--card-bg);
    color: var(--text-primary);
    border-bottom: 1px solid var(--accent-blue);
}

.report-panel {
    display: none;
}

.report-panel.active {
    display: block;
}

/* ===== Home Page ===== */
/* Hide nav links bar on home page (card UI replaces it) */
.home-page > nav:not(.admin-bar) {
    display: none;
}

.home-toolbar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 0;
    max-width: 800px;
    margin: 0 auto;
    padding: 8px 20px;
}

.home-toolbar .theme-toggle,
.home-toolbar .lang-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 4px 8px;
    font-family: inherit;
    transition: color 0.15s;
}

.home-toolbar .theme-toggle:hover,
.home-toolbar .lang-btn:hover {
    color: var(--text-primary);
}

.home-toolbar .lang-dropdown {
    position: relative;
}

@media (max-width: 768px) {
    .home-toolbar {
        padding: 8px 12px;
    }
}

.home-hero {
    padding: 32px 24px;
}

.home-hero h1 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.home-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.home-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
}

.home-card {
    display: block;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-top: none;
    padding: 12px 16px;
    text-decoration: none;
    transition: background-color 0.15s;
    /* collapse borders between cards */
    margin-left: -1px;
}

.home-cards > .home-card:nth-child(odd) {
    margin-left: 0;
}

.home-card:hover {
    background-color: var(--bg-surface-hover);
    text-decoration: none;
}

.home-card h2 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.home-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.5;
}

.home-section {
    margin-top: 24px;
}

.home-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-bottom: none;
    padding: 14px 20px;
}

.home-section-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

@media (max-width: 480px) {
    .home-hero {
        padding: 24px 16px;
    }

    .home-hero h1 {
        font-size: 1.2rem;
    }

    .home-cards {
        grid-template-columns: 1fr;
    }

    .home-card {
        margin-left: 0;
    }

    .home-section-header {
        padding: 12px 16px;
    }

    .home-section-header h2 {
        font-size: 1rem;
    }
}

/* ===== Post List & Cards ===== */
.post-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.post-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-bottom: none;
    padding: 20px 24px;
    border-radius: 0;
    transition: border-color 0.15s;
}

.post-item + .post-item {
    border-top: none;
}

.post-item:last-child {
    border-bottom: 1px solid var(--border);
}

.post-item h2 {
    margin-bottom: 8px;
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.4;
}

.post-item h2 a {
    color: var(--text-primary);
}

.post-item h2 a:hover {
    color: var(--link);
    text-decoration: none;
}

.post-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.post-excerpt {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===== Single Post ===== */
.post-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 32px;
    border-radius: 0;
}

.post-content h1 {
    margin-bottom: 15px;
    font-size: 1.6rem;
    letter-spacing: -0.02em;
}

.post-content .post-body {
    margin-top: 20px;
    line-height: 1.8;
}

/* ===== Forms ===== */
form {
    max-width: 100%;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 0;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.2);
}

.form-group textarea {
    min-height: 300px;
    resize: vertical;
    font-family: inherit;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    background-color: var(--btn-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 0;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    font-family: inherit;
    line-height: 1;
    box-sizing: border-box;
    transition: background-color 0.15s, border-color 0.15s;
}

.btn:hover {
    background-color: var(--btn-hover);
    text-decoration: none;
}

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

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-danger:hover {
    background-color: var(--btn-danger-hover);
}

.btn-small {
    padding: 5px 10px;
    font-size: 0.85rem;
    height: 30px;
}

/* ===== Admin ===== */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.admin-header h1 {
    font-size: 1.3rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
    margin-bottom: 15px;
}

.stat-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 10px 14px;
    text-align: center;
}

.stat-box .stat-number {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--accent-blue);
}

.stat-box .stat-label {
    color: var(--text-muted);
    margin-top: 2px;
    font-size: 0.85rem;
}

/* ===== Posts Table ===== */
.posts-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.posts-table th,
.posts-table td {
    vertical-align: top;
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.posts-table th {
    background-color: var(--bg-surface);
    font-weight: 600;
}

.posts-table tr:hover {
    background-color: var(--bg-surface-hover);
}

.posts-table td.actions {
    display: table-cell;
    gap: 5px;
}

.action-group {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

/* ===== Messages ===== */
.message {
    padding: 12px 16px;
    margin-bottom: 20px;
    border: 1px solid;
    border-radius: 0;
    font-size: 0.92rem;
}

.message-success {
    background-color: var(--success-bg);
    border-color: var(--success-border);
    color: var(--success-text);
}

.message-error {
    background-color: var(--error-bg);
    border-color: var(--error-border);
    color: var(--error-text);
}

/* ===== Login Form ===== */
.login-container {
    max-width: 400px;
    margin: 50px auto;
}

.login-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 30px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
}

/* ===== Footer ===== */
footer {
    padding: 12px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.stealth-link {
    color: inherit;
    text-decoration: none;
}

.stealth-link:hover {
    color: inherit;
    text-decoration: none;
}

.chat-page footer {
    margin-top: 4px;
    padding: 4px;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    margin: 24px 0;
    flex-wrap: wrap;
}

.pagination .btn-small {
    min-width: 36px;
    text-align: center;
}

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

.pagination .btn-small.active:hover {
    background-color: var(--btn-primary-hover);
    border-color: var(--btn-primary-hover);
}

.pagination-ellipsis {
    color: var(--text-muted);
    padding: 0 4px;
}

/* ===== Link Toolbar & Modal ===== */
.link-toolbar {
    margin-bottom: 8px;
}

.link-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.link-modal {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 24px;
    width: 100%;
    max-width: 450px;
}

.link-modal h3 {
    margin-bottom: 16px;
}

/* ===== Chat Page Layout ===== */
.chat-page {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    height: var(--vh, 100dvh);
    overflow: hidden;
}

.chat-page nav {
    flex-shrink: 0;
    margin-bottom: 0;
}

.chat-page .container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    max-width: none;
    width: 100%;
    padding: 0;
}

.chat-page nav .nav-content {
    max-width: 100%;
}

.chat-page footer {
    display: none;
}

/* Chat Box */
.chat-box {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0;
    padding: 20px;
    margin-bottom: 0;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

.chat-message {
    padding: 10px 14px;
    margin-bottom: 10px;
    max-width: 80%;
    word-wrap: break-word;
    line-height: 1.5;
    border-radius: 0;
}

.chat-message-user {
    background-color: var(--btn-primary);
    color: #fff;
    margin-left: auto;
    text-align: right;
    white-space: pre-wrap;
}

.chat-message-ai {
    background-color: var(--bg-surface-hover);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.chat-message-ai p { margin: 0.4em 0; }
.chat-message-ai p:first-child { margin-top: 0; }
.chat-message-ai p:last-child { margin-bottom: 0; }
.chat-message-ai ul, .chat-message-ai ol { padding-left: 1.5em; margin: 0.4em 0; }
.chat-message-ai li { margin-bottom: 0.2em; }

.chat-message-ai code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 0;
    font-size: 0.9em;
}

.chat-message-ai pre {
    background-color: var(--bg-inset);
    padding: 12px;
    border-radius: 0;
    overflow-x: auto;
    margin: 10px 0;
    border: 1px solid var(--border);
}

.chat-message-ai pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-primary);
}

.chat-message-ai a { color: var(--link); text-decoration: none; }
.chat-message-ai a:hover { text-decoration: underline; }

.chat-message-log {
    background-color: var(--bg-inset);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9em;
    font-style: italic;
    padding: 10px 15px;
    line-height: 1.4;
    border-radius: 0;
}

.chat-message-log p,
.chat-message-log ul,
.chat-message-log ol {
    margin: 2px 0; font-size: 0.9em; color: var(--text-secondary);
}

.chat-message-log ul,
.chat-message-log ol {
    padding-left: 20px;
}

.chat-message-log li { margin-bottom: 2px; }
.chat-message-log > *:last-child { margin-bottom: 0; }

.chat-message-log code {
    background: var(--code-bg);
    color: #ffca28;
}

.chat-message-error {
    color: var(--error-text);
}

.chat-input-row {
    display: flex;
    gap: 0;
}

.chat-input-row input {
    flex: 1;
    padding: 10px 12px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 0;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.15s;
}

.chat-input-row input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.2);
}

.chat-input-row button {
    white-space: nowrap;
}

/* Post Navigation */
.post-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.post-nav-left {
    display: flex;
    align-items: center;
    gap: 5px;
}

.post-nav-right {
    display: flex;
    gap: 8px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .container {
        padding: 0;
    }

    nav {
        padding: 0;
        margin-bottom: 0;
    }

    nav .logo {
        font-size: 1.1rem;
        padding: 8px 10px;
    }

    nav .nav-content {
        flex-direction: row;
        gap: 0;
    }

    nav .nav-links a,
    nav .nav-links .theme-toggle,
    nav .nav-links .lang-btn,
    nav .nav-links .nav-logout-btn {
        padding: 8px 8px;
        font-size: 0.82rem;
    }

    .compact-header {
        padding: 10px 14px;
        margin-bottom: 0;
    }

    .compact-header h1 {
        font-size: 1rem;
    }

    .post-item {
        padding: 16px;
    }

    .post-item h2 {
        font-size: 1.05rem;
    }

    .admin-header {
        flex-direction: column;
        gap: 15px;
    }

    .posts-table {
        font-size: 0.9rem;
    }

    .posts-table .actions {
        flex-direction: column;
        gap: 5px;
    }

    .posts-table .actions .btn-small {
        font-size: 0.75rem;
        padding: 4px 8px;
        white-space: nowrap;
        height: auto;
    }

    .chat-message {
        max-width: 90%;
    }

    .chat-box {
        min-height: 0;
    }

    .post-content {
        padding: 20px 16px;
    }
}