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

:root {
    --ch-bg: #f3f2ef;
    --ch-white: #ffffff;
    --ch-primary: #0a66c2;
    --ch-primary-dark: #004182;
    --ch-text: #191919;
    --ch-text2: #666666;
    --ch-muted: #999;
    --ch-border: #e0dfdc;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--ch-bg);
    color: var(--ch-text);
    min-height: 100vh;
    line-height: 1.5;
}

.ch-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    height: 52px;
    background: var(--ch-white);
    border-bottom: 1px solid var(--ch-border);
}

.ch-brand { font-size: 1.1rem; font-weight: 700; color: var(--ch-primary); }

.ch-nav-r { display: flex; align-items: center; gap: 1rem; }

.ch-link { color: var(--ch-text2); text-decoration: none; font-size: 0.9rem; }
.ch-link:hover, .ch-link.active { color: var(--ch-primary); }

.ch-user { color: var(--ch-muted); font-size: 0.85rem; }

.ch-btn {
    display: inline-block; padding: 0.4rem 1rem; border-radius: 20px;
    font-size: 0.85rem; font-weight: 600; text-decoration: none;
    cursor: pointer; border: none; font-family: inherit; transition: all 0.15s;
}

.ch-btn.primary { background: var(--ch-primary); color: white; }
.ch-btn.primary:hover { background: var(--ch-primary-dark); }
.ch-btn.outline { background: none; color: var(--ch-text2); border: 1px solid var(--ch-border); }
.ch-btn.outline:hover { background: var(--ch-bg); border-color: var(--ch-text2); }
.ch-btn.lg { padding: 0.6rem 2rem; font-size: 1rem; }
.ch-btn.sm { padding: 0.25rem 0.7rem; font-size: 0.8rem; }
.ch-btn.block { width: 100%; text-align: center; }

.ch-hero {
    text-align: center; padding: 6rem 2rem; max-width: 600px; margin: 0 auto;
}

.ch-hero h1 { font-size: 2.2rem; margin-bottom: 1rem; }
.ch-hero p { color: var(--ch-text2); margin-bottom: 2rem; }

/* Login */
.ch-login-bg { display: flex; min-height: 100vh; background: var(--ch-bg); }
.ch-login-wrap { display: flex; justify-content: center; align-items: center; width: 100%; padding: 2rem; }

.ch-login-card {
    width: 100%; max-width: 380px; background: var(--ch-white);
    border-radius: 8px; padding: 2rem; box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    text-align: center;
}

.ch-login-card h1 { font-size: 1.3rem; color: var(--ch-primary); margin-bottom: 0.2rem; }
.ch-login-card > p { color: var(--ch-text2); font-size: 0.9rem; margin-bottom: 1.5rem; }

.ch-form { display: flex; flex-direction: column; gap: 0.7rem; }
.ch-form input {
    padding: 0.55rem 0.8rem; border: 1px solid var(--ch-border);
    border-radius: 4px; font-size: 0.9rem; font-family: inherit;
}
.ch-form input:focus { outline: none; border-color: var(--ch-primary); }

.ch-alert {
    background: #fef2f2; border: 1px solid #fecaca; color: #dc2626;
    padding: 0.5rem; border-radius: 4px; font-size: 0.85rem; margin-bottom: 0.5rem;
}

.ch-login-demo { margin-top: 1rem; font-size: 0.8rem; color: var(--ch-muted); }
.ch-login-demo code { background: var(--ch-bg); padding: 0.1rem 0.3rem; border-radius: 3px; }

/* Content */
.ch-content { max-width: 700px; margin: 0 auto; padding: 1.5rem; }

.ch-profile-mini {
    background: var(--ch-white); border: 1px solid var(--ch-border);
    border-radius: 8px; padding: 1.5rem; margin-bottom: 1rem; text-align: center;
}
.ch-profile-mini h2 { font-size: 1.2rem; }
.ch-profile-mini p { color: var(--ch-text2); font-size: 0.9rem; }

.ch-section {
    background: var(--ch-white); border: 1px solid var(--ch-border);
    border-radius: 8px; padding: 1.5rem; margin-bottom: 1rem;
}
.ch-section h2 { font-size: 1rem; margin-bottom: 0.5rem; }
.ch-section p { font-size: 0.9rem; color: var(--ch-text2); margin-bottom: 0.8rem; }

.ch-textarea {
    width: 100%; padding: 0.8rem; border: 1px solid var(--ch-border);
    border-radius: 4px; font-family: monospace; font-size: 0.85rem;
    margin-bottom: 0.5rem; resize: vertical;
}
.ch-textarea:focus { outline: none; border-color: var(--ch-primary); }

.ch-pre {
    margin-top: 0.8rem; padding: 1rem; background: #1e1e1e; color: #d4d4d4;
    border-radius: 6px; font-size: 0.8rem; font-family: monospace;
    max-height: 400px; overflow: auto; white-space: pre-wrap; display: none;
}
.ch-pre:not(:empty) { display: block; }

.ch-quick { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.ch-footer { text-align: center; padding: 2rem; color: var(--ch-muted); font-size: 0.8rem; }

@media (max-width: 600px) { .ch-content { padding: 1rem; } }