:root {
    --background: #2C2F36;
    --background-dark: #1E2124;
    --surface: #36393F;
    --surface-elevated: #3C4043;
    --cyan: #4ECDC4;
    --cyan-light: #66D9EF;
    --cyan-dark: #3BA99C;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B3B8;
    --text-muted: #8B949E;
    --text-accent: #4ECDC4;
    --success: #00D084;
    --warning: #FFB84D;
    --error: #FF6B6B;
    --info: #4ECDC4;
    --border: #404449;
    --divider: #36393F;
    --shadow: rgba(0, 0, 0, 0.3);
    --font-mono: "SF Mono", Monaco, Inconsolata, 'Roboto Mono', Consolas, 'Courier New', monospace;
    --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    font-family: var(--font-mono);
    background: var(--background-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.terminal-window {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 8px 24px var(--shadow);
    margin: 2rem auto;
    width: 90%;
    max-width: 900px;
}

.title-bar {
    background: var(--surface);
    height: 32px;
    border-radius: 12px 12px 0 0;
    display: flex;
    align-items: center;
    padding: 0 16px;
}

.mac-buttons {
    display: flex;
    gap: 8px;
}

.mac-button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.red { background: #FF5F57; }
.yellow { background: #FFBD2E; }
.green { background: #28CA42; }

.window-title {
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    flex-grow: 1;
}

.terminal-content {
    padding: 24px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 24px;
    text-decoration: none;
    background: linear-gradient(90deg, var(--text-muted) 0%, var(--surface) 50%, var(--background) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 2px;
    text-transform: lowercase;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 24px;
}

nav a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

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

main {
    flex-grow: 1;
}

h1, h2, h3 {
    color: var(--cyan);
    margin-bottom: 16px;
    font-weight: 600;
}

p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.tool-section, .test-section {
    margin-top: 16px;
}

textarea, input[type="text"], input[type="email"], input[type="number"] {
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    padding: 12px;
    width: 100%;
    font-size: 14px;
}

textarea {
    min-height: 80px;
    resize: vertical;
}

.button-group, .option-group {
    margin-top: 16px;
}

button, .button {
    background: var(--text-primary);
    color: var(--background);
    border: 1px solid var(--border);
    padding: 12px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s ease-in-out;
    display: inline-block;
    text-decoration: none;
}

button:hover, .button:hover {
    background: var(--surface);
    color: var(--text-primary);
    border-color: var(--cyan);
}

.input-group {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 16px;
}

.character-count {
    font-size: 12px;
    color: var(--text-muted);
    text-align: right;
    margin-top: 8px;
}

.instructions-section ul {
    list-style-type: none;
    padding-left: 0;
}

.instructions-section li {
    margin-bottom: 16px;
    padding-left: 28px;
    position: relative;
}

.instructions-section li::before {
    content: '>';
    color: var(--cyan);
    position: absolute;
    left: 0;
    font-weight: 700;
}

footer {
    border-top: 1px solid var(--border);
    padding: 24px;
    margin-top: 32px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

footer nav ul {
    justify-content: center;
    margin-bottom: 16px;
}

footer nav a {
    font-size: 12px;
    text-transform: none;
    letter-spacing: 0;
}

.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.test-section {
    grid-column: 1 / -1;
}

@media (max-width: 768px) {
    .terminal-window {
        width: 95%;
        margin: 1rem auto;
    }

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

    nav ul {
        margin-top: 16px;
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }

    .input-group {
        flex-direction: column;
        align-items: stretch;
    }

    h1 {
        font-size: 24px;
    }
}