:root {
    --bg: #f8f9fc;
    --bg-card: #ffffff;
    --text: #1e1e2e;
    --text-secondary: #585b70;
    --border: #e0e2e8;
    --accent: #6c5ce7;
    --accent-hover: #5a4bd1;
    --accent-light: #eae6ff;
    --header-border: #e0e2e8;
    --footer-text: #888;
    --shadow: 0 1px 3px rgba(0,0,0,0.06);
    --radius: 8px;
    --focus: #6c5ce7;
    --success-bg: #d4edda;
    --success-text: #155724;
    --success-border: #c3e6cb;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --error-border: #f5c6cb;
    --input-bg: #fff;
    --input-border: #d0d3db;
}

[data-theme="dark"] {
    --bg: #121218;
    --bg-card: #1a1a24;
    --text: #e4e4ec;
    --text-secondary: #9a9ab0;
    --border: #2a2a3a;
    --accent: #8b7cf7;
    --accent-hover: #a092ff;
    --accent-light: #2a2440;
    --header-border: #2a2a3a;
    --footer-text: #6a6a80;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --focus: #8b7cf7;
    --success-bg: #1a3a24;
    --success-text: #8bddb0;
    --success-border: #2a4a34;
    --error-bg: #3a1a1a;
    --error-text: #f5a0a0;
    --error-border: #5a2a2a;
    --input-bg: #222230;
    --input-border: #333345;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    max-width: 960px;
    margin: 0 auto;
    padding: 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    border-bottom: 1px solid var(--header-border);
    margin-bottom: 2.5rem;
    padding-bottom: 1rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

nav {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    align-items: center;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.925rem;
    font-weight: 500;
    transition: color 0.15s;
}

nav a:hover {
    color: var(--text);
}

nav a.ativo {
    color: var(--accent);
    font-weight: 600;
}

main {
    flex: 1;
}

main h2 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--text);
}

main p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

footer {
    border-top: 1px solid var(--header-border);
    margin-top: 3rem;
    padding-top: 1rem;
    text-align: center;
    color: var(--footer-text);
    font-size: 0.85rem;
}

form {
    max-width: 480px;
}

label {
    display: block;
    margin-top: 0.75rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text);
}

input, textarea, select {
    width: 100%;
    padding: 0.65rem 0.75rem;
    margin: 0.25rem 0 0.5rem;
    border: 1px solid var(--input-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: var(--input-bg);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    accent-color: var(--accent);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--focus);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 20%, transparent);
}

button {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.65rem 1.4rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: background 0.15s;
    margin-top: 1rem;
}

button:hover {
    background: var(--accent-hover);
}

.btn-toggle-tema {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    margin: 0;
    transition: background 0.15s, color 0.15s;
}

.btn-toggle-tema:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.oculto {
    display: none;
}

.msg-sucesso {
    color: var(--success-text);
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    padding: 0.75rem;
    border-radius: var(--radius);
    margin-top: 1rem;
}

.msg-erro {
    color: var(--error-text);
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    padding: 0.75rem;
    border-radius: var(--radius);
    margin-top: 1rem;
}

.erro {
    border-color: var(--error-text) !important;
}

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

    header {
        flex-direction: column;
        align-items: flex-start;
    }

    nav {
        width: 100%;
        gap: 0.75rem;
    }

    main h2 {
        font-size: 1.35rem;
    }
}