:root {
    --primary: #10b981;       /* Emerald 500 */
    --background: #022c22;    /* Emerald 950 */
    --surface: #064e3b;       /* Emerald 900 */
    --text: #ecfdf5;          /* Emerald 50 */
    --text-light: #6ee7b7;    /* Emerald 300 */
    --border: #047857;        /* Emerald 700 */
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--surface);
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    padding: 20px 0;
    margin-bottom: 40px;
    border-bottom: 2px solid var(--primary);
}

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

h1 {
    color: var(--primary);
    font-size: 26px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

nav a {
    text-decoration: none;
    color: var(--text-light);
    margin-left: 20px;
    font-weight: 600;
    transition: color 0.3s;
}

nav a.active, nav a:hover {
    color: var(--primary);
}

.intro {
    text-align: center;
    margin-bottom: 40px;
}

.intro h2 {
    margin-bottom: 10px;
    color: var(--primary);
}

.intro p {
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Translator UI */
.translator-ui {
    display: flex;
    gap: 20px;
}

.box {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.box label {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--primary);
}

.box textarea {
    height: 300px;
    padding: 15px;
    background-color: #065f46;
    color: #ffffff;
    border: 2px solid var(--border);
    border-radius: 8px;
    resize: none;
    font-size: 16px;
    transition: border-color 0.2s;
}

.box textarea:focus {
    outline: none;
    border-color: var(--primary);
}

#output-text {
    background-color: #047857;
}

/* Grammar Page */
.grammar-content h2 {
    margin-bottom: 15px;
    color: var(--primary);
}

.rule-box {
    background-color: var(--surface);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    border: 1px solid var(--border);
}

.rule-box h3 {
    color: var(--primary);
    margin-bottom: 10px;
}

.rule-box ul {
    margin-top: 10px;
    padding-left: 20px;
}