/* ========================================
   Header
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-bg);
    background-image: var(--bg-pattern);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    box-sizing: border-box;
    transition: background-color var(--transition-normal), border-color var(--transition-normal), background-image var(--transition-normal);
}

.header-content {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-primary);
    font-family: var(--ui-serif);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-icon {
    width: 24px;
    height: 24px;
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.file-name {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.file-name:hover {
    background: var(--color-hover);
    color: var(--color-text);
}

.file-name-input {
    font-size: 0.875rem;
    padding: 4px 8px;
    border: 1px solid var(--color-primary);
    border-radius: 4px;
    background: var(--color-bg);
    color: var(--color-text);
    outline: none;
    max-width: 300px;
    min-width: 150px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

.icon-btn:active {
    transform: scale(0.95);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

#editBtn svg {
    width: 16px;
    height: 16px;
}

/* Edit button - placeholder styles only */
#editBtn {
    opacity: 1;
    cursor: pointer;
}

/* Save button */
#saveBtn {
    opacity: 1;
    cursor: pointer;
}

#saveBtn.active {
    color: var(--color-accent);
}

.theme-icon {
    transition: all var(--transition-normal);
}

.theme-icon.sun {
    display: block;
}

.theme-icon.moon {
    display: none;
}

[data-theme="dark"] .theme-icon.sun {
    display: none;
}

[data-theme="dark"] .theme-icon.moon {
    display: block;
}

#themeToggle:hover .theme-icon.sun {
    transform: rotate(45deg);
}

#themeToggle:hover .theme-icon.moon {
    transform: rotate(-15deg);
}

/* ========================================
   Pattern Theme —— 标题栏/状态栏从背景取主色
   仅在 body.has-pattern-theme 时生效（国风/信笺），
   深色模式与纯色/文艺背景保持原样
   ======================================== */

body.has-pattern-theme .header {
    border-bottom-color: var(--pattern-line);
}

body.has-pattern-theme .status-bar {
    border-top-color: var(--pattern-line);
}

/* Logo 与书名 */
body.has-pattern-theme .logo {
    color: var(--pattern-accent);
}

/* 标题栏图标按钮：Lucide 会把 <i> 换成 <svg>，pattern-theme 下统一改用 mask 上主色 */
body.has-pattern-theme .header-right .icon-btn {
    color: var(--pattern-accent);
    border: 1px solid transparent;
    transition: background-color var(--transition-fast), border-color var(--transition-fast),
                color var(--transition-fast), transform var(--transition-fast);
}
body.has-pattern-theme .header-right .icon-btn svg,
body.has-pattern-theme .header-right .icon-btn i {
    display: inline-block;
}
body.has-pattern-theme .header-right .icon-btn > svg,
body.has-pattern-theme .header-right .icon-btn > i > svg {
    color: currentColor;
    stroke: currentColor;
}
body.has-pattern-theme .header-right .icon-btn:hover {
    color: var(--pattern-accent);
    border-color: var(--pattern-line);
    background-color: color-mix(in srgb, var(--pattern-paper) 55%, var(--pattern-accent) 8%);
}

/* 编辑模式保存态强调色也随主题 */
body.has-pattern-theme #saveBtn.active {
    color: var(--pattern-accent);
}