* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --bg-primary: #0b0d1a;
    --bg-card: rgba(18, 22, 40, 0.75);
    --border-glow: #6b5cff;
    --text-primary: #e8eaff;
    --text-secondary: #a6b0e0;
    --accent-cyan: #00e5ff;
    --accent-purple: #b388ff;
    --shadow-glow: 0 0 30px rgba(0, 229, 255, 0.15);
    --font-mono: 'Segoe UI', 'JetBrains Mono', monospace;
    --radius-lg: 24px;
}
body {
    background: radial-gradient(circle at 20% 30%, #141a2b, #07090f 90%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: var(--font-mono);
    color: var(--text-primary);
    padding: 24px;
    padding-top: 40px;
    padding-bottom: 40px;
    overflow-x: hidden;
}
#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    z-index: 0;
    pointer-events: none;
}
.container {
    display: flex;
    gap: 20px;
    max-width: 1400px;
    width: 100%;
    flex-wrap: wrap;
    position: relative;
    z-index: 10;
    padding: 20px 0;
}

/* ==================== 左侧窄边栏 (新增) ==================== */
.social-sidebar {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    padding: 20px 12px;
    border: 1px solid rgba(107, 92, 255, 0.25);
    box-shadow: var(--shadow-glow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    transition: 0.3s;
    height: fit-content; /* 使其高度自适应图标数量并与顶部对齐 */
}

.social-sidebar:hover {
    border-color: rgba(0, 229, 255, 0.5);
    box-shadow: 0 0 45px rgba(0, 229, 255, 0.2);
}

.sidebar-icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(0, 229, 255, 0.04);
    border: 1px solid rgba(0, 229, 255, 0.15);
    color: var(--text-secondary);
    transition: all 0.3s ease;
    text-decoration: none;
}

.sidebar-icon-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
    transition: fill 0.3s ease;
}

.sidebar-icon-btn:hover {
    background: rgba(0, 229, 255, 0.15);
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
    transform: scale(1.1);
    box-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
}

/* ==================== 主卡片样式 ==================== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    border: 1px solid rgba(107, 92, 255, 0.25);
    box-shadow: var(--shadow-glow);
    transition: 0.3s;
    display: flex;
    flex-direction: column;
}
.card:hover {
    border-color: rgba(0, 229, 255, 0.5);
    box-shadow: 0 0 45px rgba(0, 229, 255, 0.2);
}
.left-card { flex: 1 1 32%; min-width: 300px; max-width: 420px; gap: 20px; }
.profile-header { text-align: center; }
.avatar {
    width: 90px; height: 90px; border-radius: 50%; margin: 0 auto 12px;
    background: linear-gradient(145deg, #3d3f7a, #1d1f3a);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: #b388ff; border: 2px solid rgba(0, 229, 255, 0.5);
}
.profile-header h2 {
    font-size: 22px; font-weight: 400; letter-spacing: 3px;
    background: linear-gradient(135deg, #e8eaff, #b388ff);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.tagline { color: var(--text-secondary); font-size: 11px; letter-spacing: 3px; text-transform: uppercase; border-top: 1px solid rgba(0, 229, 255, 0.2); padding-top: 6px; }
.profile-desc { line-height: 1.6; color: var(--text-secondary); font-size: 13px; border-left: 2px solid rgba(0, 229, 255, 0.3); padding-left: 12px; }
.section-block { display: flex; flex-direction: column; gap: 10px; }
.section-title { font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--accent-cyan); border-bottom: 1px solid rgba(0, 229, 255, 0.15); padding-bottom: 6px; }
.tree-container { background: rgba(0, 0, 0, 0.25); border: 1px solid rgba(0, 229, 255, 0.15); border-radius: 12px; padding: 10px 14px; font-size: 12px; color: var(--text-secondary); }
.tree-container summary { cursor: pointer; color: var(--accent-cyan); padding: 3px 6px; }
.tree-container ul { list-style: none; padding-left: 18px; border-left: 1px dashed rgba(107, 92, 255, 0.3); margin: 4px 0; }
.tree-container li { margin: 4px 0; color: #d0d9ff; }

/* 项目列表滚动条 */
.repo-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 175px;
    overflow-y: auto;
    padding-right: 4px;
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 229, 255, 0.3) rgba(0, 0, 0, 0.2);
}
.repo-list::-webkit-scrollbar { width: 5px; }
.repo-list::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.25); border-radius: 10px; }
.repo-list::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, rgba(0, 229, 255, 0.4), rgba(179, 136, 255, 0.4));
    border-radius: 10px;
    border: 1px solid rgba(0, 229, 255, 0.2);
    transition: background 0.3s;
}
.repo-list::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
    box-shadow: 0 0 8px rgba(0, 229, 255, 0.6);
}

.repo-card-item { background: rgba(0, 229, 255, 0.03); border: 1px solid rgba(0, 229, 255, 0.1); border-radius: 12px; padding: 10px 14px; text-decoration: none; color: var(--text-secondary); transition: 0.2s; }
.repo-card-item:hover { background: rgba(0, 229, 255, 0.08); transform: translateX(4px); color: #fff; }
.repo-card-title { display: flex; justify-content: space-between; font-size: 13px; color: var(--accent-cyan); }
.repo-card-desc { font-size: 11px; opacity: 0.75; }

/* AI 聊天卡片 */
.chat-card {
    flex: 1 1 50%;
    min-width: 340px;
    padding: 28px 24px 20px;
    background: rgba(10, 12, 28, 0.6);
    height: 520px;
    align-self: flex-start;
    justify-content: space-between;
}
.chat-title { font-size: 18px; letter-spacing: 4px; color: var(--accent-cyan); border-bottom: 1px solid rgba(0, 229, 255, 0.2); padding-bottom: 14px; margin-bottom: 14px; }
.chat-box {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 380px;
    padding-right: 4px;
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 229, 255, 0.3) rgba(0, 0, 0, 0.2);
}
.chat-box::-webkit-scrollbar { width: 5px; }
.chat-box::-webkit-scrollbar-track { background: rgba(0, 0, 0, 0.25); border-radius: 10px; }
.chat-box::-webkit-scrollbar-thumb { background: rgba(0, 229, 255, 0.3); border-radius: 10px; }
.chat-box::-webkit-scrollbar-thumb:hover { background: var(--accent-cyan); }

.message { max-width: 82%; padding: 12px 16px; border-radius: 20px; font-size: 14px; line-height: 1.6; }
.msg-ai { background: rgba(40, 45, 85, 0.7); color: #d0d9ff; align-self: flex-start; border-left: 2px solid var(--accent-cyan); }
.msg-user { background: linear-gradient(135deg, #2f2f7a, #1b1d4a); color: #f0f3ff; align-self: flex-end; border-right: 2px solid var(--accent-purple); }
.input-area { display: flex; gap: 8px; background: rgba(0, 0, 0, 0.3); padding: 4px; border-radius: 80px; border: 1px solid rgba(0, 229, 255, 0.15); }
.input-area input { flex: 1; padding: 12px 16px; background: transparent; border: none; outline: none; color: var(--text-primary); font-family: var(--font-mono); }
.input-area button { background: linear-gradient(145deg, #3d3f7a, #26285a); border: 1px solid rgba(0, 229, 255, 0.2); color: white; padding: 0 22px; border-radius: 60px; cursor: pointer; transition: 0.2s; }
.btn-reset { background: rgba(255, 50, 50, 0.15) !important; border-color: rgba(255, 50, 50, 0.3) !important; padding: 0 14px !important; }

.input-area input:disabled,
.input-area button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* 响应式支持 */
@media (max-width: 860px) {
    .container { flex-direction: column; }
    .social-sidebar { flex-direction: row; justify-content: center; width: 100%; }
    .left-card, .chat-card { width: 100%; max-width: 100%; }
    #bg-canvas { display: none; }
}