:root {
    --bg-primary: #001327;
    --bg-secondary: #ffffff;
    --bg-accent: #f1f3f6;
    --text-primary: #1a1a1a;
    --text-secondary: #5f6368;
    --text-accent: #007aff;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0,0,0,0.06);
    --hover-bg: #f1f3f6;
    --active-bg: #e5e7eb;
}

[data-theme="dark"] {
    --bg-primary: #18191a;
    --bg-secondary: #23272f;
    --bg-accent: #222326;
    --text-primary: #f5f6fa;
    --text-secondary: #b0b3b8;
    --text-accent: #0a84ff;
    --border-color: #2c2c2e;
    --shadow-color: rgba(0,0,0,0.25);
    --hover-bg: #23272f;
    --active-bg: #18191a;
}

body {
    background: var(--bg-primary) !important;
    color: var(--text-primary) !important;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 18px;
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

.bg-primary {
    background: var(--bg-primary) !important;
}

.bg-secondary {
    background: var(--bg-secondary) !important;
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
}

.bg-accent {
    background: var(--bg-accent) !important;
}

.text-primary {
    color: var(--text-primary) !important;
}

.text-secondary {
    color: var(--text-secondary) !important;
}

.text-accent {
    color: var(--text-accent) !important;
}

.text-brand-copper {
    color: var(--brand-copper) !important;
}

.text-brand-brass {
    color: var(--brand-brass) !important;
}

.border-accent {
    border-color: var(--border-color) !important;
}

/* Interactive elements */
.btn {
    background: linear-gradient(135deg, var(--brand-copper), var(--brand-brass));
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px var(--shadow-color);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.card {
    background: var(--bg-secondary);
    border-radius: 1.25rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 12px var(--shadow-color);
    transition: box-shadow 0.3s, border-color 0.3s, transform 0.3s;
}

.card:hover {
    box-shadow: 0 8px 32px var(--shadow-color);
    border-color: var(--text-accent);
    transform: translateY(-2px) scale(1.01);
}

/* Logo styling */
.logo {
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.08));
    transition: filter 0.3s;
}

.logo:hover {
    filter: drop-shadow(0 4px 16px rgba(0,0,0,0.12));
}

/* Theme toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: box-shadow 0.3s, border-color 0.3s, transform 0.3s;
    box-shadow: 0 2px 8px var(--shadow-color);
    color: var(--text-accent);
}

.theme-toggle:hover {
    box-shadow: 0 8px 24px var(--shadow-color);
    border-color: var(--text-accent);
    transform: scale(1.08);
}

/* Gradient text - theme aware */
.gradient-text {
    background: linear-gradient(90deg, #007aff 0%, #0a84ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    font-weight: 700;
    letter-spacing: -0.5px;
    transition: background 0.3s;
}

/* Animations */
.animate-float {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.animate-glow {
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from { box-shadow: 0 0 12px #007aff33; }
    to { box-shadow: 0 0 32px #0a84ff66; }
}

/* Responsive design */
@media (max-width: 768px) {
    .card {
        padding: 1rem;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
    }
}

/* Navigation links */
.nav-link {
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
}

.nav-link:hover {
    color: var(--text-accent);
    background: var(--hover-bg);
    transform: translateY(-2px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--brand-copper), var(--brand-brass));
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

/* Background gears */
.gear-animation {
    color: var(--text-secondary);
    opacity: 0.1;
}

[data-theme="dark"] .gear-animation {
    color: var(--brand-brass);
    opacity: 0.15;
}

/* Modern glassmorphism effects */
.glass {
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(24px);
    border: 1px solid #e5e7eb;
}

[data-theme="dark"] .glass {
    background: rgba(30,30,30,0.7);
    border: 1px solid #2c2c2e;
}