:root {
    /* Цветовая палитра (VS Code Dark Theme inspired) */
    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --bg-tertiary: #333333;
    --text-primary: #d4d4d4;
    --text-secondary: #a0a0a0;
    --accent-color: #007acc;
    --accent-hover: #0062a3;
    --border-color: #454545;
    --error-color: #f48771;
    --success-color: #89d185;

    /* Шрифты */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    /* Размеры */
    --container-width: 1200px;
    --header-height: 60px;
    --radius: 6px;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

/* --- Layout --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* --- Navbar --- */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    border: none;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

.btn-outline:hover {
    background-color: rgba(0, 122, 204, 0.1);
}

.btn-block {
    display: block;
    width: 100%;
}

/* --- Hero Section --- */
.hero {
    padding: 80px 0;
    text-align: center;
    background: radial-gradient(circle at center, #2d2d2d 0%, var(--bg-primary) 70%);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 15px;
    color: #fff;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Features Section --- */
.features {
    padding: 60px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 15px;
    display: block;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: #fff;
}

/* --- Auth Page (Login/Register) --- */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    padding: 40px 20px;
}

.auth-card {
    background-color: var(--bg-secondary);
    width: 100%;
    max-width: 400px;
    border-radius: var(--radius);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 15px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.auth-form-container {
    padding: 30px;
    display: none;
}

.auth-form-container.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

/* --- CodeMirror Hints (Dark Theme) --- */
.CodeMirror-hints {
    background: #252526 !important;
    border: 1px solid #454545 !important;
    color: #d4d4d4 !important;
    border-radius: var(--radius);
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    padding: 0 !important;
    z-index: 2000 !important;
}

.CodeMirror-hint {
    color: #d4d4d4 !important;
    padding: 2px 8px !important;
    border-radius: 0 !important;
}

.CodeMirror-hint-active {
    background: var(--accent-color) !important;
    color: #ffffff !important;
}

.hint-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-width: 150px;
}

.hint-label {
    color: #808080;
    font-size: 0.85em;
    margin-left: 10px;
    white-space: nowrap;
}