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

:root {
    --color-bg: #0f0f0f;
    --color-surface: #1a1a1a;
    --color-surface-hover: #252525;
    --color-border: #333;
    --color-text: #e0e0e0;
    --color-text-muted: #888;
    --color-accent: #6c9bcf;
    --color-accent-hover: #8bb4e0;
    --color-danger: #cf6c6c;
    --nav-height: 56px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover {
    color: var(--color-accent-hover);
}

/* Navigation */
.main-nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-right: 2rem;
}

.nav-brand:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.25rem;
    align-items: center;
}

.nav-auth {
    display: flex;
    list-style: none;
    margin-left: auto;
    align-items: center;
}

.logout-form {
    display: inline;
}

.logout-btn {
    background: none;
    border: none;
    color: var(--color-text-muted);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: inherit;
    font-family: inherit;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
}

.logout-btn:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}

.nav-links a {
    color: var(--color-text-muted);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: color 0.2s, background 0.2s;
}

.nav-links a:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}

.nav-links a.active {
    color: var(--color-accent);
    background: var(--color-surface-hover);
}

/* Content */
.content {
    margin-top: var(--nav-height);
    min-height: calc(100vh - var(--nav-height));
}

.page-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.page-container h1 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.page-container p {
    margin-bottom: 1rem;
    color: var(--color-text-muted);
}

/* Forms */
.login-container {
    max-width: 400px;
    margin-top: calc(var(--nav-height) + 4rem);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.form-group input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.error-message {
    background: rgba(207, 108, 108, 0.15);
    border: 1px solid var(--color-danger);
    color: var(--color-danger);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
}

.btn-danger {
    background: var(--color-danger);
    color: #fff;
}

.btn-secondary {
    background: var(--color-surface-hover);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
}