/* =========================================
   y-toolbox 全局统一 UI 样式库
========================================= */
:root {
    --bg-app: #0f172a; 
    --bg-panel: #1e293b; 
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8; 
    --border-color: #334155;
    --accent: #3b82f6; 
    --accent-hover: #2563eb; 
    --accent-glow: rgba(59, 130, 246, 0.4);
    --btn-bg: #334155; 
    --btn-hover: #475569; 
    --btn-text: #cbd5e1;
}

html.light-mode {
    --bg-app: #f1f5f9; 
    --bg-panel: #ffffff; 
    --text-primary: #1e293b;
    --text-secondary: #64748b; 
    --border-color: #cbd5e1;
    --accent: #2563eb; 
    --accent-hover: #1d4ed8;
    --btn-bg: #e2e8f0; 
    --btn-hover: #cbd5e1; 
    --btn-text: #334155;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
    background-color: var(--bg-app); 
    color: var(--text-primary);
    margin: 0; padding: 20px; 
    display: flex; flex-direction: column; align-items: center; 
    min-height: 100vh; box-sizing: border-box;
}

.main-wrapper { width: 100%; max-width: 1100px; display: flex; flex-direction: column; flex: 1; }

/* =========================================
   四维口袋专属页眉 (终极居中焊死版)
========================================= */
.pocket-header {
    position: relative; /* 设置相对参考系 */
    display: flex; justify-content: space-between; align-items: center;
    background-color: var(--bg-panel); border: 1px solid var(--border-color);
    border-radius: 12px; padding: 15px 20px; margin-bottom: 25px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
    min-height: 74px; box-sizing: border-box;
}

.pocket-brand {
    position: absolute; left: 50%; transform: translateX(-50%); /* 绝对居中，无视左右按钮宽度 */
    font-size: 22px !important; 
    font-weight: 900; letter-spacing: 2px;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    user-select: none; text-align: center; white-space: nowrap;
}

.btn-back, .theme-toggle {
    height: 40px !important;
    display: flex; align-items: center; justify-content: center;
    box-sizing: border-box; white-space: nowrap;
}

.btn-back {
    background: var(--accent); color: #fff; font-size: 15px; font-weight: bold;
    border-radius: 30px; text-decoration: none; padding: 0 24px; gap: 6px;
    box-shadow: 0 4px 15px var(--accent-glow);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.btn-back:hover {
    transform: translateX(-6px);
    background: var(--accent-hover); box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-back.placeholder {
    visibility: hidden; pointer-events: none;
}

.theme-toggle {
    background: var(--bg-app); border: 1px solid var(--border-color);
    color: var(--text-primary); border-radius: 20px; padding: 0 16px;
    cursor: pointer; font-size: 14px; font-weight: bold; transition: all 0.3s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ----------------------------------------- */

.global-header {
    display: flex; justify-content: space-between; align-items: flex-end;
    margin-bottom: 20px; padding-bottom: 15px; border-bottom: 1px dashed var(--border-color);
}
.global-header .title-group h1 {
    margin: 0; font-size: 26px !important; color: var(--text-primary);
}
.global-header .title-group .subtitle { font-size: 13px; color: var(--text-secondary); margin-top: 5px; display: block; }

.panel {
    background: var(--bg-panel); border: 1px solid var(--border-color);
    border-radius: 12px; padding: 20px; box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    margin-bottom: 20px; box-sizing: border-box;
}

.btn {
    border: none; padding: 8px 16px; border-radius: 6px; cursor: pointer;
    font-size: 14px; font-weight: 600; transition: all 0.2s;
    display: inline-flex; align-items: center; gap: 6px; text-decoration: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 12px var(--accent-glow); }
.btn-normal { background: var(--btn-bg); color: var(--btn-text); border: 1px solid transparent; }
.btn-normal:hover { background: var(--btn-hover); color: var(--text-primary); border-color: var(--border-color); }

input[type="text"], input[type="number"], textarea {
    width: 100%; padding: 10px 15px; background-color: var(--bg-app);
    border: 1px solid var(--border-color); border-radius: 6px;
    color: var(--text-primary); font-family: inherit; box-sizing: border-box;
    outline: none; transition: border-color 0.2s;
}
input:focus, textarea:focus { border-color: var(--accent); }