:root {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --accent-color: #ff4757;
    --accent-hover: #ff6b81;
    --card-bg: #2f3542;
    --font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--card-bg);
    padding: 20px 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
    font-weight: 800;
}

header h1 a {
    color: var(--text-color);
    text-decoration: none;
}

nav a, nav button {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 600;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

nav .nav-btn {
    background-color: var(--accent-color);
    padding: 10px 20px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

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

main {
    padding: 40px 20px;
}

.flash {
    background-color: #7bed9f;
    color: #2f3542;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    font-weight: 600;
}

form div {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

input[type="text"], input[type="password"], input[type="email"], input[type="number"] {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 5px;
    background-color: #57606f;
    color: white;
}

button[type="submit"], .btn-primary {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    display: inline-block;
    text-decoration: none;
}

button[type="submit"]:hover, .btn-primary:hover {
    background-color: var(--accent-hover);
}

.error {
    color: var(--accent-color);
    font-weight: bold;
    display: block;
    margin-top: 5px;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: #a4b0be;
}