/* 
   CST Contabilidade - Estilo Principal
   Foco: Autoridade, Clareza e Profissionalismo
*/

:root {
    --primary-color: #1a2a6c;
    --secondary-color: #b21f1f;
    --accent-color: #fdbb2d;
    --text-dark: #2d3436;
    --text-light: #636e72;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --border-color: #dfe6e9;
    --font-main: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: "Georgia", "Times New Roman", serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--primary-color);
}

h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; position: relative; padding-bottom: 15px; }
h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--secondary-color);
}

p { margin-bottom: 20px; }

.educational-text {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: #444;
}

/* Header & Nav */
header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--secondary-color);
}

/* Hero Section */
.hero {
    background: var(--bg-light) url('../img/pattern.svg');
    padding: 100px 0;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 25px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 35px;
}

/* Cards & Blocks */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.card {
    background: var(--white);
    padding: 40px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--primary-color);
    color: var(--white);
}

/* Form */
.contact-form {
    max-width: 600px;
    margin: 40px auto;
    background: var(--bg-light);
    padding: 40px;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-main);
}

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}

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

/* Footer */
footer {
    background: #1a1a1a;
    color: rgba(255,255,255,0.7);
    padding: 60px 0 20px;
    font-size: 0.85rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info {
    opacity: 0.6;
    font-size: 0.8rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    h1 { font-size: 2.2rem; }
    .hero h1 { font-size: 2.5rem; }
}