/* --- 基础样式 --- */
:root {
    --bg-color: #050510;
    --accent-cyan: #00f3ff;
    --accent-purple: #bc13fe;
    --glass-bg: rgba(20, 20, 35, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #ffffff;
    --text-dim: #a0a0b0;
}

body, html {
    margin: 0; padding: 0; height: 100%;
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color); color: var(--text-main);
    overflow: hidden;
}

#canvas-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; }
.app-container { position: relative; z-index: 10; width: 100%; height: 100%; display: flex; flex-direction: column; }

/* Header */
header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 0 30px; height: 70px;
    backdrop-filter: blur(10px); background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
}
.brand {
    font-size: 1.4rem; font-weight: bold; letter-spacing: 2px;
    background: linear-gradient(90deg, #fff, var(--accent-cyan));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    cursor: pointer;
}
.header-right { display: flex; gap: 15px; align-items: center; }
nav ul { display: flex; list-style: none; gap: 20px; margin: 0; padding: 0; }
nav li {
    cursor: pointer; font-size: 0.85rem; text-transform: uppercase;
    letter-spacing: 1px; color: var(--text-dim); transition: 0.3s;
}
nav li:hover, nav li.active { color: var(--accent-cyan); text-shadow: 0 0 8px var(--accent-cyan); }
#lang-select {
    background-color: rgba(0,0,0,0.3); color: var(--accent-cyan);
    border: 1px solid var(--glass-border); padding: 5px;
    border-radius: 5px; cursor: pointer; outline: none; width: 100px;
}
#lang-select option { background-color: #1a1a2e; color: #fff; }

/* Main */
main { flex: 1; position: relative; display: flex; justify-content: center; align-items: center; }
.page {
    position: absolute; width: 85%; max-width: 900px;
    opacity: 0; transform: translateY(20px); transition: all 0.5s ease;
    pointer-events: none; display: none;
}
.page.active { opacity: 1; transform: translateY(0); pointer-events: all; display: block; }

.hero-title { font-size: 3.5rem; margin-bottom: 20px; text-shadow: 0 0 20px rgba(0, 243, 255, 0.3); text-align: center; }
.hero-content { text-align: center; }
.highlight { font-style: italic; color: var(--accent-purple); }
.status-badge {
    display: inline-block; padding: 5px 15px; border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan); font-size: 0.8rem; margin-top: 30px;
    border-radius: 20px; background: rgba(0, 243, 255, 0.05);
}

/* Chat Interface */
.chat-interface {
    background: rgba(0, 0, 0, 0.85);
    border: 1px solid var(--accent-cyan);
    border-radius: 5px;
    height: 550px;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(20px);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.1);
    position: relative;
    overflow: hidden;
}
.chat-interface::before {
    content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: repeating-linear-gradient(0deg, transparent 0px, transparent 1px, rgba(0, 243, 255, 0.03) 2px);
    pointer-events: none; z-index: 1;
}

.chat-window {
    flex: 1; padding: 20px; overflow-y: auto;
    font-family: 'Courier New', monospace; font-size: 0.9rem;
    z-index: 2;
    scrollbar-width: thin; scrollbar-color: var(--accent-cyan) transparent;
}

/* 消息样式 */
.msg { margin-bottom: 4px; line-height: 1.4; word-break: break-all; text-shadow: 0 0 2px rgba(0,0,0,0.5); }
.msg.sys { color: #888; font-size: 0.8rem; }
.msg.sys-info { color: var(--accent-cyan); }
.msg.sys-warn { color: #ffcc00; }
.msg.sys-err { color: #ff3333; font-weight: bold;}
.msg.ai { 
    color: #fff; margin-top: 20px; padding: 15px;
    border-left: 3px solid var(--accent-purple);
    background: linear-gradient(90deg, rgba(188,19,254,0.1), transparent);
    font-size: 1.1rem;
    animation: fadeIn 1s ease;
}

/* 底部状态栏 & 进度条 */
.terminal-status-bar {
    padding: 15px 20px;
    border-top: 1px solid var(--glass-border);
    background: rgba(10, 10, 20, 0.95);
    z-index: 2;
    min-height: 60px;
    display: flex;
    flex-direction: column; /* 改为纵向排列以适应文字和条 */
    justify-content: center;
}

.progress-track {
    width: 100%; height: 6px; background: rgba(255,255,255,0.1); border-radius: 3px; overflow: hidden; margin-top: 5px;
}
.progress-fill {
    height: 100%; width: 0%; 
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    box-shadow: 0 0 15px var(--accent-cyan);
    transition: width 0.1s linear; /* 平滑过渡 */
    position: relative;
}
/* 增加进度条上的斜纹流动动画 */
.progress-fill::after {
    content: ""; position: absolute; top: 0; left: 0; bottom: 0; right: 0;
    background-image: linear-gradient(45deg,rgba(255,255,255,.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.15) 50%,rgba(255,255,255,.15) 75%,transparent 75%,transparent);
    background-size: 20px 20px;
    animation: moveStripes 1s linear infinite;
}

@keyframes moveStripes {
    0% { background-position: 0 0; }
    100% { background-position: 20px 0; }
}

/* 交互按钮 */
.cyber-btn {
    background: transparent; color: var(--accent-cyan);
    font-family: inherit; font-size: 1rem; font-weight: bold; letter-spacing: 2px;
    padding: 12px 40px; border: 1px solid var(--accent-cyan);
    cursor: pointer; text-transform: uppercase; transition: 0.3s;
    clip-path: polygon(10% 0, 100% 0, 100% 70%, 90% 100%, 0 100%, 0 30%);
    margin-top: 5px;
}
.cyber-btn:hover { background: var(--accent-cyan); color: #000; box-shadow: 0 0 20px var(--accent-cyan); }

/* Vision */
.vision-card {
    background: var(--glass-bg); padding: 40px; border-radius: 15px;
    border: 1px solid var(--glass-border); backdrop-filter: blur(15px);
}
.vision-card h2 { color: var(--accent-cyan); margin-top: 0; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@media (max-width: 768px) {
    .hero-title { font-size: 2rem; }
    header { padding: 0 10px; }
    #lang-select { width: 80px; }
}