:root { --primary: #007bff; --primary-dark: #0056b3; --text-dark: #1a1a2e; --text-gray: #71717a; --bg-gray: #f7f7f7; --white: #ffffff; --border: #e5e5e5; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Poppins', sans-serif; background: var(--bg-gray); color: var(--text-dark); }
.navbar { background: var(--white); padding: 1rem 2rem; box-shadow: 0 2px 10px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 0.5rem; text-decoration: none; color: var(--text-dark); font-weight: 700; }
.logo img { height: 40px; }
.nav-menu { display: flex; gap: 2rem; list-style: none; }
.nav-menu a { color: var(--text-dark); text-decoration: none; font-weight: 500; }
.container { max-width: 800px; margin: 0 auto; padding: 2rem; }
.page-header { margin-bottom: 2rem; }
.page-header h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.settings-card { background: var(--white); border-radius: 12px; padding: 2rem; box-shadow: 0 2px 10px rgba(0,0,0,0.05); margin-bottom: 1.5rem; }
.settings-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 2px solid var(--border); }
.setting-item { display: flex; justify-content: space-between; align-items: center; padding: 1.25rem 0; border-bottom: 1px solid var(--border); }
.setting-item:last-child { border-bottom: none; }
.setting-info h3 { font-size: 1.05rem; margin-bottom: 0.25rem; }
.setting-info p { color: var(--text-gray); font-size: 0.85rem; }
.setting-control select { padding: 0.6rem 2.5rem 0.6rem 1rem; border: 2px solid var(--border); border-radius: 8px; font-size: 0.95rem; background: var(--white); cursor: pointer; }
.setting-control select:focus { outline: none; border-color: var(--primary); }
.btn-save { background: var(--primary); color: white; padding: 0.75rem 2rem; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; margin-top: 1.5rem; }
.btn-save:hover { background: var(--primary-dark); }
.back-link { display: inline-block; margin-bottom: 1.5rem; color: var(--primary); text-decoration: none; font-weight: 600; }
@media (max-width: 768px) { .nav-menu { display: none; } }