/* ============ 基础样式 ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #0f0f1a;
    color: #e0e0e0;
    min-height: 100vh;
}

a { color: #7c8aff; text-decoration: none; }
a:hover { color: #a0b0ff; }

/* ============ 导航栏 ============ */
.navbar {
    background: #1a1a2e;
    border-bottom: 1px solid #2a2a4a;
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 24px;
}
.nav-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
}
.nav-links { display: flex; align-items: center; gap: 16px; margin-left: auto; }
.nav-links a { font-size: 0.9rem; }
.nav-user { font-size: 0.85rem; color: #aab; }

/* ============ 按钮 ============ */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
    text-decoration: none;
}
.btn-primary { background: linear-gradient(135deg, #6c63ff, #4a42e0); color: #fff; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(108,99,255,0.4); }
.btn-secondary { background: #2a2a4a; color: #ccc; }
.btn-secondary:hover { background: #3a3a5a; }
.btn-danger { background: #c0392b; color: #fff; }
.btn-danger:hover { background: #e74c3c; }
.btn-block { display: block; width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ============ 表单 ============ */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 0.85rem; color: #aab; }
.form-control {
    width: 100%;
    padding: 10px 14px;
    background: #1a1a2e;
    border: 1px solid #2a2a4a;
    border-radius: 8px;
    color: #e0e0e0;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}
.form-control:focus { outline: none; border-color: #6c63ff; }
textarea.form-control { resize: vertical; }

/* ============ 首页 ============ */
.hero {
    text-align: center;
    padding: 80px 20px 60px;
    background: linear-gradient(180deg, #1a1a2e, #0f0f1a);
}
.hero h1 { font-size: 2.5rem; margin-bottom: 12px; }
.hero-desc { color: #aab; font-size: 1.1rem; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.features {
    max-width: 1000px;
    margin: 60px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}
.feature-card {
    background: #1a1a2e;
    border: 1px solid #2a2a4a;
    border-radius: 12px;
    padding: 28px 20px;
    text-align: center;
    transition: transform 0.2s;
}
.feature-card:hover { transform: translateY(-4px); border-color: #6c63ff; }
.feature-icon { font-size: 2.5rem; margin-bottom: 12px; }
.feature-card h3 { margin-bottom: 8px; }
.feature-card p { font-size: 0.85rem; color: #999; }

/* ============ 绘图页 ============ */
.draw-page { max-width: 1200px; margin: 0 auto; padding: 30px 20px; }
.draw-page h2 { margin-bottom: 24px; font-size: 1.6rem; }

.draw-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
}
@media (max-width: 768px) {
    .draw-container { grid-template-columns: 1fr; }
}

.draw-input-panel, .draw-result-panel {
    background: #1a1a2e;
    border: 1px solid #2a2a4a;
    border-radius: 12px;
    padding: 24px;
}

.result-placeholder {
    text-align: center;
    padding: 40px 20px;
    color: #666;
}
.result-placeholder .hint { font-size: 0.8rem; margin-top: 8px; }

/* 任务卡片 */
.task-item {
    background: #222240;
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 12px;
}
.task-status { margin-bottom: 8px; font-weight: 600; }
.task-error { color: #e74c3c; }
.task-info { font-size: 0.85rem; color: #aab; margin-top: 8px; }

.spinner {
    width: 32px; height: 32px;
    border: 3px solid #2a2a4a;
    border-top-color: #6c63ff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-img { width: 100%; border-radius: 8px; display: block; }

/* ============ 历史记录 ============ */
.history-section { margin-top: 20px; }
.history-section h3 { margin-bottom: 16px; }
.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
}
.history-item {
    background: #1a1a2e;
    border: 1px solid #2a2a4a;
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.2s;
}
.history-item:hover { transform: scale(1.03); }
.history-item img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
.history-info { padding: 8px; font-size: 0.78rem; }
.history-prompt { color: #aab; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-status { height: 100px; display: flex; align-items: center; justify-content: center; font-size: 2rem; }

/* ============ 登录/注册 ============ */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 140px);
    padding: 40px 20px;
}
.auth-card {
    background: #1a1a2e;
    border: 1px solid #2a2a4a;
    border-radius: 12px;
    padding: 32px;
    width: 100%;
    max-width: 400px;
}
.auth-card h2 { text-align: center; margin-bottom: 24px; }
.auth-switch { text-align: center; margin-top: 16px; font-size: 0.85rem; color: #888; }

/* ============ 管理后台 ============ */
.admin-page { max-width: 1000px; margin: 0 auto; padding: 30px 20px; }
.admin-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.admin-content { background: #1a1a2e; border: 1px solid #2a2a4a; border-radius: 12px; padding: 24px; }

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    margin-bottom: 8px;
    background: #222240;
    border-radius: 8px;
    gap: 12px;
}

/* ============ 页脚 ============ */
.footer {
    text-align: center;
    padding: 24px;
    border-top: 1px solid #2a2a4a;
    color: #666;
    font-size: 0.82rem;
    margin-top: 60px;
}