/* =====================================================================================
   基础样式：设计变量、全局重置、排版、表单控件与按钮
   ===================================================================================== */

/* ---------- 设计变量：颜色、圆角、阴影、间距统一在此维护 ---------- */
:root {
    /* 主色与语义色 */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-soft: #eff6ff;
    --color-success: #16a34a;
    --color-success-soft: #ecfdf5;
    --color-warning: #d97706;
    --color-warning-soft: #fffbeb;
    --color-danger: #dc2626;
    --color-danger-soft: #fef2f2;
    --color-info: #0891b2;
    --color-info-soft: #ecfeff;

    /* 中性色 */
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;
    --color-bg: #f1f5f9;
    --color-surface: #ffffff;
    --color-surface-alt: #f8fafc;

    /* 优先级颜色（1 最高 - 5 最低） */
    --priority-1: #dc2626;
    --priority-2: #ea580c;
    --priority-3: #2563eb;
    --priority-4: #64748b;
    --priority-5: #94a3b8;

    /* 尺寸 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-pill: 999px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.16);

    /* 层级 */
    --z-header: 100;
    --z-drawer: 200;
    --z-modal: 300;
    --z-toast: 400;
}

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    margin: 0;
}

body {
    font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: 600;
    line-height: 1.4;
}

p {
    margin: 0;
}

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

a:hover {
    text-decoration: underline;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

/* 滚动条美化（Chromium 内核） */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border: 3px solid transparent;
    border-radius: var(--radius-pill);
    background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
    background-clip: content-box;
}

/* ---------- 表单控件 ---------- */
.form-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.form-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-label .required {
    color: var(--color-danger);
    margin-left: 2px;
}

.form-hint {
    font-size: 12px;
    color: var(--color-text-muted);
}

.form-error {
    font-size: 12px;
    color: var(--color-danger);
}

.input,
.select,
.textarea {
    width: 100%;
    padding: 8px 12px;
    font-family: inherit;
    font-size: 14px;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.input:focus,
.select:focus,
.textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.input:disabled,
.select:disabled,
.textarea:disabled {
    background: var(--color-surface-alt);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

.input.is-invalid,
.select.is-invalid,
.textarea.is-invalid {
    border-color: var(--color-danger);
}

.textarea {
    min-height: 96px;
    resize: vertical;
}

.select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8.5 1.5 4h9z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 16px;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.15s, border-color 0.15s, color 0.15s, opacity 0.15s;
}

.btn:hover:not(:disabled) {
    background: var(--color-surface-alt);
    border-color: var(--color-text-muted);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

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

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

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

.btn-danger:hover:not(:disabled) {
    background: #fee2e2;
    border-color: var(--color-danger);
}

/* 完成类操作的强调按钮（任务列表与详情中的「完成」） */
.btn-success {
    color: var(--color-success);
    border-color: #bbf7d0;
    background: var(--color-success-soft);
}

.btn-success:hover:not(:disabled) {
    background: #dcfce7;
    border-color: var(--color-success);
}

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

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

.btn-sm {
    padding: 4px 10px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
}

/* 按钮内的加载指示器 */
.btn .spinner {
    width: 14px;
    height: 14px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* ---------- 通用工具类 ---------- */
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.hidden { display: none !important; }
.nowrap { white-space: nowrap; }