:root {
    color-scheme: light;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #f1f5f9;
    --accent-color: #0f9f91;
    --text-color: #172438;
    --text-light: #64748b;
    --text-primary: #172438;
    --text-secondary: #64748b;
    --background-color: #f5f7fb;
    --bg-primary: #f5f7fb;
    --card-background: #ffffff;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.92);
    --glass-border: rgba(226, 232, 240, 0.9);
    --glass-shadow: 0 16px 48px rgba(15, 23, 42, 0.08);
    --error-color: #dc2626;
    --success-color: #059669;
    --footer-bg: #101c2e;
    --footer-text: #e2e8f0;
    --border-radius: 14px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 20px 56px rgba(15, 23, 42, 0.12);
    --transition: 180ms ease;
}

.dark-theme {
    color-scheme: dark;
    --primary-color: #60a5fa;
    --primary-hover: #3b82f6;
    --secondary-color: #1e293b;
    --accent-color: #2dd4bf;
    --text-color: #e5edf8;
    --text-light: #9aabc1;
    --text-primary: #e5edf8;
    --text-secondary: #9aabc1;
    --background-color: #0b1220;
    --bg-primary: #0b1220;
    --card-background: #111c2e;
    --card-bg: #111c2e;
    --border-color: #26354b;
    --glass-bg: rgba(17, 28, 46, 0.94);
    --glass-border: rgba(51, 68, 91, 0.85);
    --glass-shadow: 0 18px 52px rgba(0, 0, 0, 0.28);
    --footer-bg: #080e19;
    --footer-text: #e5edf8;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.18);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 56px rgba(0, 0, 0, 0.28);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color var(--transition), color var(--transition);
}

.dark-theme body {
    background: var(--background-color);
}

.logo-link {
    color: inherit;
    text-decoration: none;
}

.dark-theme .hero {
    background: linear-gradient(120deg, #101c2f 0%, #142b49 58%, #10263f 100%);
}

.dark-theme .navbar {
    background-color: rgba(11, 18, 32, 0.92);
    border-bottom: 1px solid var(--border-color);
}

.dark-theme .features-section {
    background-color: var(--background-color);
}

.dark-theme .feature-card,
.dark-theme .auth-card,
.dark-theme .container,
.dark-theme .cta-card,
.dark-theme .policy-container {
    background-color: var(--card-background);
    border-color: var(--border-color);
    box-shadow: var(--shadow-md);
}

.dark-theme .feature-card p,
.dark-theme .about-content p,
.dark-theme .tagline,
.dark-theme .auth-header p {
    color: var(--text-light);
}

.dark-theme .about-section {
    background-color: #0e1929;
}

.dark-theme footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
}

.theme-toggle {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 1000;
    display: flex;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--card-background);
    color: var(--text-color);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: transform var(--transition), background-color var(--transition), color var(--transition);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    background: var(--primary-color);
    color: #ffffff;
}

:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.45);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}