/* ============================================================
   个人网站 - 共用样式
   ============================================================ */

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

:root,
body.theme-light {
    --bg: #ffffff;
    --fg: #000000;
    --border: #000000;
    --hover-bg: #000000;
    --hover-fg: #ffffff;
}

body.theme-gray {
    --bg: #606060;
    --fg: #ffffff;
    --border: #ffffff;
    --hover-bg: #ffffff;
    --hover-fg: #000000;
}

body.theme-dark {
    --bg: #000000;
    --fg: #ffffff;
    --border: #ffffff;
    --hover-bg: #ffffff;
    --hover-fg: #000000;
}

html, body {
    width: 100%;
    min-height: 100%;
}

body {
    font-family: Arial, "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--fg);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.2s ease;
}

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

/* ===== 顶部栏 ===== */

.top-bar {
    flex-shrink: 0;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 12px;
    padding: 20px 4%;
}

.top-bar .back {
    margin-right: auto;
    border: 1px solid var(--border);
    padding: 10px 20px;
    font-size: 15px;
    transition: background-color 0.12s ease, color 0.12s ease;
}

.top-bar .back:hover {
    background: var(--hover-bg);
    color: var(--hover-fg);
}

.theme-toggle {
    background: transparent;
    color: var(--fg);
    border: 1px solid var(--border);
    padding: 10px 20px;
    font-size: 15px;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.12s ease, color 0.12s ease;
}

.theme-toggle:hover {
    background: var(--hover-bg);
    color: var(--hover-fg);
}

/* ===== 大按钮 ===== */

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border: 2px solid var(--border);
    background: var(--bg);
    color: var(--fg);
    font-size: clamp(18px, 1.8vw, 28px);
    cursor: pointer;
    transition: background-color 0.12s ease, color 0.12s ease, transform 0.08s ease;
    padding: 10px;
    line-height: 1.3;
}

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

.btn:active {
    transform: scale(0.98);
}

/* ===== 页面标题 ===== */

.page-title {
    flex-shrink: 0;
    text-align: center;
    font-size: clamp(24px, 3vw, 36px);
    font-weight: normal;
    padding: 0 4% 20px 4%;
    margin: 0;
}

/* ===== 内容区 ===== */

.content-area {
    flex: 1;
    min-height: 0;
    margin: 0 4% 2% 4%;
    border: 2px solid var(--border);
    padding: 30px;
    font-size: 17px;
    line-height: 1.8;
    overflow-y: auto;
}

.content-area p {
    margin-bottom: 12px;
}

/* ===== 页脚 ===== */

.footer {
    flex-shrink: 0;
    padding: 10px 4% 14px 4%;
    text-align: center;
    font-size: 12px;
}

.footer a {
    opacity: 0.55;
}

.footer a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* ===== 站长入口 ===== */

.admin-entry {
    position: fixed;
    bottom: 25px;
    right: 16px;
    font-size: 12px;
    border: 1px solid var(--border);
    padding: 5px 10px;
    background: var(--bg);
    opacity: 0;
    transition: opacity 0.25s ease;
}

.admin-entry:hover {
    opacity: 0.85;
}

/* ===== 手机端 ===== */

@media (max-width: 700px) {
    .top-bar {
        padding: 14px 5%;
        gap: 8px;
    }
    .top-bar .back,
    .theme-toggle {
        padding: 8px 14px;
        font-size: 14px;
    }
    .content-area {
        margin: 0 5% 3% 5%;
        padding: 20px;
        font-size: 15px;
    }
}


/* ===== 主题按钮组 ===== */
.theme-group {
    display: flex;
}

.theme-btn {
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--border);
    padding: 8px 18px;
    font-size: 14px;
    cursor: pointer;
    font-family: inherit;
    transition: background-color 0.12s ease, color 0.12s ease;
}

.theme-btn:hover {
    background: var(--hover-bg);
    color: var(--hover-fg);
}

.theme-btn.active {
    background: var(--hover-bg);
    color: var(--hover-fg);
    font-weight: bold;
}