/* Retinora — shared layout: clinical minimal + blue accent */

:root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f0f4ff;
    --color-bg-elevated: #ffffff;
    --color-bg-muted: #e8edf5;

    --color-ink: #0a0a0a;
    --color-accent-primary: #2563eb;
    --color-accent-deep: #1d4ed8;
    --color-accent-primary-hover: #3b82f6;
    --color-accent-warm: #1e40af;
    --color-accent-gold: #60a5fa;
    --color-highlight: #93c5fd;
    --color-cta: #2563eb;
    --color-cta-hover: #1d4ed8;

    --color-text-primary: #0a0a0a;
    --color-text-secondary: #374151;
    --color-text-muted: #6b7280;

    --color-border: rgba(37, 99, 235, 0.15);
    --color-border-strong: rgba(37, 99, 235, 0.3);

    --color-header-bg: linear-gradient(135deg, #0a0a0a 0%, #111827 48%, #1e3a8a 100%);
    --color-header-border: rgba(96, 165, 250, 0.35);

    --font-primary: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --shadow-sm: 0 2px 12px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 12px 40px rgba(15, 23, 42, 0.1);
    --shadow-lg: 0 24px 64px rgba(15, 23, 42, 0.12);
    --shadow-glow-warm: 0 8px 32px rgba(37, 99, 235, 0.25);

    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-blob: 60% 40% 55% 45% / 45% 55% 45% 55%;

    --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

main {
    position: relative;
    z-index: 1;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 1px 1px, rgba(37, 99, 235, 0.04) 1px, transparent 0),
        radial-gradient(ellipse 120% 80% at 0% 0%, rgba(37, 99, 235, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse 90% 60% at 100% 10%, rgba(96, 165, 250, 0.03) 0%, transparent 45%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.97) 0%, rgba(255, 255, 255, 1) 40%);
    background-size:
        24px 24px,
        100% 100%,
        100% 100%,
        100% 100%;
    pointer-events: none;
    z-index: 0;
}

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-header-border);
    box-shadow: 0 4px 24px rgba(10, 10, 10, 0.3);
    transition: var(--transition-base);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    transition: var(--transition-base);
}

.logo::before {
    content: '';
    width: 14px;
    height: 14px;
    background: radial-gradient(circle at 40% 40%, #93c5fd 0%, #2563eb 50%, #1d4ed8 100%);
    border-radius: 50%;
    box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.5), 0 0 12px rgba(37, 99, 235, 0.4);
    flex-shrink: 0;
}

.logo:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.65rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.03em;
    text-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
}

.logo-image {
    height: 50px;
    width: auto;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.35rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    color: rgba(255, 255, 255, 0.82);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    position: relative;
    transition: var(--transition-base);
    border-radius: 999px;
}

.nav-link::after {
    display: none;
}

.nav-link:hover {
    color: #fff;
    background: rgba(37, 99, 235, 0.25);
    box-shadow: 0 0 0 1px rgba(96, 165, 250, 0.35);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(96, 165, 250, 0.3);
    border-radius: 10px;
    cursor: pointer;
    padding: 0.55rem 0.65rem;
}

.mobile-menu-toggle span {
    width: 22px;
    height: 2px;
    background: #ffffff;
    transition: var(--transition-base);
    border-radius: 2px;
}

.main-footer {
    position: relative;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-top: calc(var(--spacing-lg) + 6px);
    background: linear-gradient(180deg, #0a0a0a 0%, #111827 40%, #1e3a8a 100%);
    z-index: 1;
    box-shadow: 0 -12px 48px rgba(10, 10, 10, 0.2);
}

.main-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-highlight), var(--color-accent-primary), var(--color-accent-gold), var(--color-highlight));
    background-size: 200% 100%;
    animation: footerShine 8s linear infinite;
}

.main-footer::after {
    content: '';
    position: absolute;
    top: 4px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(147, 197, 253, 0.3), transparent);
}

@keyframes footerShine {
    0% {
        background-position: 0% 50%;
    }
    100% {
        background-position: 200% 50%;
    }
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    text-align: center;
}

.footer-text,
.footer-links {
    color: rgba(226, 232, 240, 0.85);
    font-size: 0.9rem;
    line-height: 1.9;
}

.footer-link {
    color: #93c5fd;
    text-decoration: none;
    transition: var(--transition-base);
    font-weight: 500;
}

.footer-link:hover {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.contact-link {
    color: var(--color-accent-deep);
    text-decoration: none;
    transition: var(--transition-base);
    font-weight: 600;
    border-bottom: 2px solid rgba(37, 99, 235, 0.35);
}

.contact-link:hover {
    color: var(--color-accent-primary-hover);
    border-bottom-color: var(--color-accent-primary-hover);
}

.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-cta) 0%, #3b82f6 100%);
    border: none;
    color: #fff;
    padding: 0.95rem 2.5rem;
    font-size: 1.05rem;
    font-weight: 700;
    border-radius: 999px;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow-warm);
    font-family: var(--font-primary);
    letter-spacing: 0.02em;
    text-decoration: none;
    text-align: center;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.4);
    filter: brightness(1.05);
    color: #fff;
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: linear-gradient(180deg, #1e3a8a 0%, #111827 100%);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0.25rem;
        transform: translateX(-100%);
        transition: var(--transition-base);
        border-bottom: 1px solid var(--color-header-border);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm);
        border-radius: var(--radius-sm);
        border-bottom: none;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: var(--spacing-sm);
    }

    .logo-text {
        font-size: 1.4rem;
    }

    .logo-image {
        height: 40px;
    }
}