/* ===========================================================
   Dear Diary — 温暖极简主题
   单一暖色系统 · 系统字体 · 直角到 8px 圆角 · 无装饰动画
   =========================================================== */

:root {
    /* 背景层级 */
    --bg: #f7f4ef;            /* 页面背景：米白 */
    --surface: #ffffff;       /* 卡片表面 */
    --surface-2: #faf8f4;     /* 二级表面（输入框、hover） */

    /* 文字层级 */
    --text: #2e2823;          /* 主文字：深棕 */
    --text-2: #6b6258;        /* 次要文字 */
    --text-3: #9a9088;        /* 三级（占位、辅助） */

    /* 边框 / 分隔 */
    --border: #e8e2d8;
    --border-strong: #d8d0c4;

    /* 强调色（克制使用） */
    --accent: #8b6f5c;        /* 暖棕：主按钮、链接 */
    --accent-hover: #6e5746;
    --accent-soft: #f3ede4;   /* 暖棕的浅底 */

    /* 状态色 */
    --success: #5d8a6a;
    --success-soft: #ebf2ed;
    --error: #b95a4a;
    --error-soft: #f7ebe8;
    --warning: #b8884a;
    --warning-soft: #f6efe2;

    /* 圆角 / 阴影 */
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(46, 40, 35, 0.04);
    --shadow: 0 1px 3px rgba(46, 40, 35, 0.06), 0 1px 2px rgba(46, 40, 35, 0.04);
    --shadow-md: 0 4px 12px rgba(46, 40, 35, 0.08);

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    --font-serif: "Georgia", "Source Han Serif SC", "Songti SC", "STSong", serif;
    --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
}

/* 重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}

/* 标题层级 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text);
    line-height: 1.3;
    letter-spacing: -0.01em;
}

h1 { font-size: 1.625rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.0625rem; }
h4 { font-size: 0.9375rem; }

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover { color: var(--accent-hover); }

/* ===========================================================
   导航栏
   =========================================================== */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 56px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 22px;
    height: 22px;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-2);
    text-decoration: none;
    padding: 0.4375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.nav-links a:hover {
    background: var(--surface-2);
    color: var(--text);
}

.nav-links a.active {
    background: var(--accent-soft);
    color: var(--accent);
}

/* ===========================================================
   容器 / 卡片
   =========================================================== */
.container {
    max-width: 760px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.container-wide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
}

/* ===========================================================
   表单
   =========================================================== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4375rem;
    color: var(--text-2);
    font-size: 0.8125rem;
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-family: inherit;
    background: var(--surface);
    color: var(--text);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-input::placeholder { color: var(--text-3); }

textarea.form-input {
    min-height: 200px;
    resize: vertical;
    line-height: 1.7;
}

/* ===========================================================
   按钮
   =========================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4375rem;
    padding: 0.5625rem 1.125rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.2;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #fff;
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border-strong);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--surface-2);
    border-color: var(--text-3);
}

.btn-ghost {
    background: transparent;
    color: var(--text-2);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background: var(--surface-2);
    color: var(--text);
}

.btn-danger {
    background: var(--surface);
    color: var(--error);
    border-color: var(--border-strong);
}

.btn-danger:hover:not(:disabled) {
    background: var(--error-soft);
    border-color: var(--error);
}

.btn-full { width: 100%; }
.btn-sm { padding: 0.375rem 0.6875rem; font-size: 0.8125rem; }

/* 图标按钮 */
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
}

.icon-btn:hover {
    background: var(--surface-2);
    color: var(--text);
}

.icon-btn svg {
    width: 16px;
    height: 16px;
}

/* ===========================================================
   工具类
   =========================================================== */
.text-muted { color: var(--text-2); }
.text-subtle { color: var(--text-3); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }
.text-warning { color: var(--warning); }

.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* ===========================================================
   Loading / Spinner
   =========================================================== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2.5rem;
    color: var(--text-3);
    font-size: 0.875rem;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===========================================================
   消息提示
   =========================================================== */
.message {
    padding: 0.6875rem 0.875rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
    border: 1px solid transparent;
}

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

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

.message-info {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}

/* ===========================================================
   认证页（login / register / admin_login）
   =========================================================== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    padding: 1.5rem;
}

.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h1 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.4375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.auth-header h1 .auth-icon {
    width: 22px;
    height: 22px;
    color: var(--accent);
}

.auth-header p {
    color: var(--text-2);
    font-size: 0.875rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.25rem;
    font-size: 0.8125rem;
    color: var(--text-2);
}

/* ===========================================================
   写日记 / 历史日记 卡片列表
   =========================================================== */
.diary-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.375rem;
    margin-bottom: 0.875rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
}

.diary-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow);
}

.diary-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    gap: 1rem;
}

.diary-card-date {
    font-size: 0.8125rem;
    color: var(--text-3);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4375rem;
}

.diary-card-weather {
    font-size: 1rem;
    line-height: 1;
}

.diary-card-preview {
    color: var(--text-2);
    font-size: 0.9375rem;
    line-height: 1.6;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    margin-bottom: 0.75rem;
}

.diary-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--text-3);
}

.diary-card-actions {
    display: flex;
    gap: 0.25rem;
}

/* ===========================================================
   批改面板
   =========================================================== */
.corrections-panel {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-top: 1.25rem;
}

.correction-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    padding: 0.875rem 1rem;
    margin-bottom: 0.6875rem;
    font-size: 0.9375rem;
}

.correction-original {
    color: var(--error);
    text-decoration: line-through;
    margin-bottom: 0.3125rem;
}

.correction-corrected {
    color: var(--success);
    font-weight: 500;
    margin-bottom: 0.3125rem;
}

.correction-explanation {
    color: var(--text-2);
    font-size: 0.8125rem;
    margin-top: 0.3125rem;
}

.suggestion-tag {
    display: inline-block;
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 0.1875rem 0.5625rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-2);
    margin-right: 0.3125rem;
    margin-top: 0.3125rem;
}

/* ===========================================================
   短语搜索框
   =========================================================== */
.phrase-search-box {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
}

.phrase-search-box h3 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.4375rem;
    display: flex;
    align-items: center;
    gap: 0.4375rem;
}

.phrase-search-box h3 svg {
    width: 16px;
    height: 16px;
    color: var(--accent);
}

.phrase-search-box > p {
    color: var(--text-2);
    font-size: 0.8125rem;
    margin-bottom: 0.875rem;
    line-height: 1.5;
}

.phrase-input-row {
    display: flex;
    gap: 0.5rem;
}

.phrase-input-row input {
    flex: 1;
    padding: 0.5625rem 0.875rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
    background: var(--surface);
    color: var(--text);
}

.phrase-input-row input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ===========================================================
   写日记编辑器
   =========================================================== */
.editor-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
}

.editor-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-2);
    font-size: 0.8125rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.editor-toolbar .toolbar-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.editor-toolbar .toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.875rem;
}

.toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.8125rem;
    color: var(--text-2);
    user-select: none;
}

.toggle input { display: none; }

.toggle-switch {
    position: relative;
    width: 32px;
    height: 18px;
    background: var(--border-strong);
    border-radius: 999px;
    transition: background 0.15s ease;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.15s ease;
    box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

.toggle input:checked + .toggle-switch {
    background: var(--accent);
}

.toggle input:checked + .toggle-switch::after {
    transform: translateX(14px);
}

.diary-textarea {
    width: 100%;
    min-height: 360px;
    border: none;
    background: transparent;
    color: var(--text);
    font-family: var(--font-serif);
    font-size: 1rem;
    line-height: 1.8;
    resize: vertical;
    padding: 0;
}

.diary-textarea:focus { outline: none; }
.diary-textarea::placeholder { color: var(--text-3); font-style: italic; }

.word-count-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0 0;
    color: var(--text-3);
    font-size: 0.8125rem;
    border-top: 1px solid var(--border);
    margin-top: 1rem;
}

.word-count-bar strong {
    color: var(--text-2);
    font-weight: 500;
}

.submit-section {
    display: flex;
    gap: 0.625rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.submit-section .btn { flex: 1; min-width: 120px; }

/* 天气选择器（仅作图标选择，无主题切换） */
.weather-selector {
    display: inline-flex;
    align-items: center;
    gap: 0.4375rem;
    color: var(--text-2);
    font-size: 0.8125rem;
}

.weather-selector select {
    padding: 0.3125rem 0.625rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-family: inherit;
    font-size: 0.8125rem;
    cursor: pointer;
}

.weather-selector select:focus {
    outline: none;
    border-color: var(--accent);
}

/* ===========================================================
   Admin 表格 / 图表
   =========================================================== */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.875rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.125rem 1.25rem;
}

.stat-number {
    font-size: 1.625rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.1;
    margin-bottom: 0.25rem;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    color: var(--text-2);
    font-size: 0.8125rem;
}

.section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.25rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border);
}

.section-header h2 {
    font-size: 1.0625rem;
    font-weight: 600;
}

.table-container {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

thead th {
    text-align: left;
    padding: 0.6875rem 1rem;
    font-weight: 500;
    color: var(--text-2);
    background: var(--surface-2);
    border-bottom: 1px solid var(--border);
    font-size: 0.8125rem;
    white-space: nowrap;
}

tbody td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: middle;
}

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

tbody tr:hover { background: var(--surface-2); }

/* Token 使用情况 */
.token-bar {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-variant-numeric: tabular-nums;
    font-size: 0.8125rem;
}

.token-bar-fill {
    width: 60px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}

.token-bar-fill > span {
    display: block;
    height: 100%;
    background: var(--accent);
    border-radius: 2px;
}

.token-bar-fill.warn > span { background: var(--warning); }
.token-bar-fill.danger > span { background: var(--error); }

/* 图表容器 */
.chart-container {
    position: relative;
    height: 280px;
    width: 100%;
}

/* ===========================================================
   模态框
   =========================================================== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(46, 40, 35, 0.4);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 1.5rem;
}

.modal[style*="display: flex"],
.modal.show {
    display: flex !important;
}

.modal-content {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    max-width: 640px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    font-size: 1.0625rem;
    font-weight: 600;
}

.modal-close {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-3);
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--surface-2);
    color: var(--text);
}

.modal-body {
    line-height: 1.7;
    color: var(--text);
}

/* ===========================================================
   空状态
   =========================================================== */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--text-2);
}

.empty-state h3 {
    color: var(--text);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.4375rem;
}

.empty-state p {
    font-size: 0.875rem;
}

/* ===========================================================
   Toast 提示
   =========================================================== */
.toast-message {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    padding: 0.625rem 1rem;
    background: var(--text);
    color: #fff;
    border-radius: var(--radius);
    font-size: 0.875rem;
    box-shadow: var(--shadow-md);
    z-index: 1100;
    opacity: 1;
    transition: opacity 0.2s ease, transform 0.2s ease;
    animation: toastIn 0.18s ease-out;
}

.toast-message.toast-error {
    background: var(--error);
}

.toast-message.toast-out {
    opacity: 0;
    transform: translateY(8px);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width: 768px) {
    .container, .container-wide {
        padding: 1.25rem 1rem;
    }
    .navbar-content { padding: 0 1rem; }
    .auth-card { padding: 2rem 1.5rem; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .submit-section .btn { min-width: 100%; }
    .editor-toolbar { font-size: 0.75rem; }
    h1 { font-size: 1.375rem; }
}

@media (max-width: 480px) {
    .stat-grid { grid-template-columns: 1fr; }
    .nav-links a { padding: 0.4375rem 0.5625rem; }
}

/* 站脚（备案号 + 站点说明） */
.site-footer {
    margin-top: 3rem;
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg);
}

.site-footer-inner {
    max-width: var(--container);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    flex-wrap: wrap;
    font-size: 0.8125rem;
    color: var(--text-3);
}

.beian-link {
    color: var(--text-2);
    text-decoration: none;
    transition: color 0.15s ease;
}

.beian-link:hover {
    color: var(--accent);
}

.site-footer-sep {
    color: var(--border-strong);
}

.site-footer-meta {
    color: var(--text-3);
}

@media (max-width: 480px) {
    .site-footer-inner { font-size: 0.75rem; gap: 0.375rem; }
}

/* 打印 */
@media print {
    .navbar, .btn, .diary-card-actions, .modal { display: none !important; }
}