:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #151515;
    --bg-tertiary: #1f1f1f;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #2ecc71;
    --accent-hover: #27ae60;
    --border: #2a2a2a;
    --shadow: rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8e8e8;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #27ae60;
    --accent-hover: #229954;
    --border: #d0d0d0;
    --shadow: rgba(0, 0, 0, 0.1);
}

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

html, body {
    height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(10, 10, 10, 0.95);
}

[data-theme="light"] .navbar {
    background-color: rgba(255, 255, 255, 0.95);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: 70px;
}

.nav-logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 1px;
    justify-self: start;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
    justify-self: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

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

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border);
    border-radius: 50px;
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s;
    justify-self: end;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

.theme-toggle .sun {
    display: none;
}

.theme-toggle .moon {
    display: inline;
}

[data-theme="light"] .theme-toggle .sun {
    display: inline;
}

[data-theme="light"] .theme-toggle .moon {
    display: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all 0.3s;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow);
}

.btn-secondary {
    border-color: var(--accent);
    color: var(--accent);
    background: transparent;
}

.btn-secondary:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-2px);
}

.btn-disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-disabled:hover {
    transform: none;
}

.hero-logo-small {
    width: 80px;
    height: auto;
    margin-top: 25px;
    opacity: 0.9;
}

main {
    flex: 1 0 auto;
}

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 30px 0;
    text-align: center;
    margin-top: 60px;
    flex-shrink: 0;
}

.footer-logo {
    width: 80px;
    height: auto;
    margin-bottom: 15px;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-logo:hover {
    opacity: 1;
}

.footer-links {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--accent);
}

.fade-in {
    animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .nav-container {
        grid-template-columns: auto 1fr auto;
    }

    .nav-toggle {
        display: flex;
        order: 2;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-secondary);
        width: 100%;
        padding: 30px 0;
        transition: left 0.3s;
        border-bottom: 1px solid var(--border);
        grid-column: 1 / -1;
    }

    .nav-menu.active {
        left: 0;
    }

    .theme-toggle {
        order: 3;
    }
}