/* ========================================
   BASE STYLES
   ======================================== */

:root {
    --color-black: #0a0a0a;
    --color-dark: #1a1a1a;
    --color-gray: #6b6b6b;
    --color-light-gray: #e5e5e5;
    --color-off-white: #f8f8f8;
    --color-white: #ffffff;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;

    --max-width: 1100px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3 {
    font-weight: 500;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.25rem);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-lg);
}

h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

p {
    color: var(--color-gray);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

/* ========================================
   LAYOUT
   ======================================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-alt {
    background-color: var(--color-off-white);
}

.section-title {
    color: var(--color-black);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--color-black);
}

/* ========================================
   NAVIGATION
   ======================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-light-gray);
}

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

.nav-logo {
    font-weight: 400;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.nav-tagline {
    font-size: 0.7rem;
    font-weight: 400;
    color: #a0a0a0;
    letter-spacing: 0;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    font-size: 0.875rem;
    color: var(--color-gray);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-black);
}

/* Language Switch */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    margin-left: var(--spacing-md);
}

.lang-switch a {
    color: var(--color-gray);
    padding: 0.25rem 0.5rem;
}

.lang-switch a:hover {
    color: var(--color-black);
}

.lang-switch a.lang-active {
    color: var(--color-black);
    font-weight: 500;
}

.lang-divider {
    color: var(--color-light-gray);
}

/* ========================================
   HERO
   ======================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-headline {
    color: var(--color-black);
    margin-bottom: var(--spacing-md);
    max-width: 800px;
}

.hero-subheadline {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    line-height: 1.6;
}

.hero-text {
    font-size: 1.0625rem;
    max-width: 650px;
}

/* ========================================
   CONTEXTS GRID
   ======================================== */

.contexts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.context-card {
    padding: var(--spacing-lg);
    background-color: var(--color-off-white);
    border-radius: 4px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.context-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.context-card h3 {
    color: var(--color-black);
}

/* ========================================
   PRINCIPLES
   ======================================== */

.principles {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    max-width: 700px;
}

.principle {
    padding-left: var(--spacing-md);
    border-left: 2px solid var(--color-black);
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.principle.visible {
    opacity: 1;
    transform: translateX(0);
}

.principle h3 {
    color: var(--color-black);
    font-size: 1rem;
}

.principle p {
    font-size: 0.9375rem;
}

/* ========================================
   BACKGROUND
   ======================================== */

.background-content {
    max-width: 650px;
}

.background-content p {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-sm);
}

.background-content p:last-child {
    margin-bottom: 0;
}

/* ========================================
   CONTACT
   ======================================== */

.contact-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.contact-content p {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-md);
}

.contact-email {
    display: inline-block;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-black);
    padding-bottom: 2px;
    border-bottom: 1px solid var(--color-black);
    transition: opacity var(--transition);
}

.contact-email:hover {
    opacity: 0.7;
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer p {
    font-size: 0.875rem;
}

.footer-social a {
    color: var(--color-gray);
    transition: color var(--transition);
}

.footer-social a:hover {
    color: var(--color-black);
}

.footer-social svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    .nav,
    .lang-switch,
    .footer-social {
        display: none !important;
    }

    .hero {
        min-height: auto;
        padding-top: 0;
    }

    .section {
        padding: 2rem 0;
        page-break-inside: avoid;
    }

    .section-alt {
        background-color: transparent;
    }

    .context-card,
    .principle {
        opacity: 1;
        transform: none;
    }

    body {
        font-size: 11pt;
        line-height: 1.5;
        color: #000;
    }

    h1 {
        font-size: 24pt;
    }

    h2 {
        font-size: 16pt;
    }

    h3 {
        font-size: 12pt;
    }

    a {
        color: #000;
    }

    .contact-email {
        border-bottom: none;
    }

    .contact-email::after {
        content: " (" attr(href) ")";
        font-size: 10pt;
        font-weight: normal;
    }
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-md);
    }

    .hero {
        min-height: auto;
        padding: 120px 0 var(--spacing-2xl);
    }

    .section {
        padding: var(--spacing-xl) 0;
    }

    .contexts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-links {
        display: none;
    }

    .lang-switch {
        margin-left: auto;
    }

    .hero-subheadline {
        font-size: 1.125rem;
    }
}