/* ===== HERBERT OKOLOWITZ PORTFOLIO - MODERN EDITORIAL STYLES ===== */

/* ===== COLOR SYSTEM ===== */
:root {
  /* Primary Palette - Sophisticated Blues */
  --color-navy-deep: #161925;      /* Deep navy - structure, primary text */
  --color-blue-dark: #23395B;      /* Dark blue - headers, emphasis */
  --color-blue-steel: #406E8E;     /* Steel blue - interactive, accents */
  --color-blue-sky: #8EA8C3;       /* Sky blue - subtle backgrounds */
  --color-aqua-pale: #CBF7ED;      /* Pale aqua - highlights, fresh accents */

  /* Semantic Color Application */
  --color-text-primary: var(--color-navy-deep);
  --color-text-secondary: var(--color-blue-dark);
  --color-text-muted: var(--color-blue-steel);

  --color-heading-primary: var(--color-navy-deep);
  --color-heading-secondary: var(--color-blue-dark);

  --color-background-primary: #ffffff;
  --color-background-secondary: var(--color-aqua-pale);
  --color-background-subtle: var(--color-blue-sky);

  --color-accent-primary: var(--color-blue-steel);
  --color-accent-secondary: var(--color-aqua-pale);

  --color-border-light: var(--color-blue-sky);
  --color-border-medium: var(--color-blue-steel);
  --color-border-strong: var(--color-blue-dark);

  /* Interactive States */
  --color-link: var(--color-blue-steel);
  --color-link-hover: var(--color-blue-dark);
  --color-button-primary: var(--color-navy-deep);
  --color-button-primary-hover: var(--color-blue-dark);
  --color-button-secondary: var(--color-blue-steel);
  --color-button-secondary-hover: var(--color-navy-deep);

  /* Editorial Elements */
  --color-divider: var(--color-blue-sky);
  --color-quote-accent: var(--color-aqua-pale);
  --color-highlight: var(--color-aqua-pale);
  --color-shadow: rgba(22, 25, 37, 0.1);
}

/* ===== CSS RESET & FOUNDATIONS ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-background-primary);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY SYSTEM ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Crimson Text', Georgia, serif;
    color: var(--color-heading-primary);
    line-height: 1.2;
    font-weight: 600;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* ===== LAYOUT CONTAINERS ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

@media (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }
}

/* ===== NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem 2rem;
}

.language-switcher {
    display: flex;
    gap: 0.5rem;
    margin-left: auto;
}

.lang-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.4rem 0.7rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.lang-link:hover {
    background: var(--color-background-secondary);
}

.lang-link.active {
    background: var(--color-accent-primary);
    color: white;
}

.portfolio-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.4rem 0.7rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    margin-left: 0.5rem;
    border: 1px solid var(--color-border-light);
}

.portfolio-link:hover {
    background: var(--color-background-secondary);
    border-color: var(--color-accent-primary);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    letter-spacing: 0.025em;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-link-hover);
    background: var(--color-background-secondary);
}

.nav-link.active {
    font-weight: 600;
    border-bottom: 2px solid var(--color-accent-primary);
}

@media (max-width: 768px) {
    .nav {
        padding: 0.75rem 1rem;
    }

    .nav-link {
        margin: 0 0.25rem;
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 8rem 0 6rem;
    background: var(--color-background-primary);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 768px) {
    .hero {
        padding: 6rem 0 4rem;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
        padding: 0 1.5rem;
    }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--color-heading-primary);
    margin-bottom: 1rem;
}

.hero-subtitle {
    display: block;
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    color: var(--color-text-secondary);
    font-weight: 400;
    margin-top: 0.5rem;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 2rem 0;
    max-width: 600px;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin: 3rem 0;
}

@media (max-width: 768px) {
    .hero-stats {
        justify-content: center;
        gap: 1.5rem;
    }
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-accent-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.hero-image {
    justify-self: center;
}

@media (max-width: 768px) {
    .hero-image {
        order: -1;
    }
}

.profile-image {
    width: 300px;
    height: 300px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 20px 40px var(--color-shadow);
}

@media (max-width: 768px) {
    .profile-image {
        width: 250px;
        height: 250px;
    }
}

/* ===== SECTION SYSTEM ===== */
.section {
    padding: 6rem 0;
}

.section:nth-child(even) {
    background: var(--color-background-secondary);
}

@media (max-width: 768px) {
    .section {
        padding: 4rem 0;
    }
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

@media (max-width: 768px) {
    .section-header {
        margin-bottom: 3rem;
    }
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    color: var(--color-heading-primary);
    margin-bottom: 1rem;
}

.section-divider {
    width: 60px;
    height: 3px;
    background: var(--color-accent-primary);
    margin: 0 auto;
}

/* ===== ABOUT SECTION ===== */
.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: start;
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

.about-lead {
    font-size: 1.375rem;
    color: var(--color-text-primary);
    font-weight: 500;
    line-height: 1.5;
}

.expertise {
    background: var(--color-background-primary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(22, 25, 37, 0.08);
}

.expertise-title {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--color-heading-secondary);
}

.expertise-list {
    list-style: none;
}

.expertise-list li {
    padding: 0.75rem 0;
    color: var(--color-text-primary);
    font-weight: 500;
    border-bottom: 1px solid var(--color-border-light);
}

.expertise-list li:last-child {
    border-bottom: none;
}

.expertise-list li::before {
    content: '→';
    color: var(--color-accent-primary);
    font-weight: bold;
    margin-right: 0.75rem;
}

/* ===== PROJECTS SECTION ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

@media (min-width: 768px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.project-card {
    background: var(--color-background-primary);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 4px 20px rgba(22, 25, 37, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--color-border-light);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(22, 25, 37, 0.12);
}

.project-title {
    font-size: 1.5rem;
    color: var(--color-heading-primary);
    margin-bottom: 1rem;
}

.project-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.project-results {
    margin-top: 1.5rem;
}

.result-badge {
    display: inline-block;
    background: var(--color-accent-secondary);
    color: var(--color-text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--color-border-light);
}

/* ===== CONTACT SECTION ===== */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: 3rem;
}

.contact-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

@media (max-width: 768px) {
    .contact-actions {
        flex-direction: column;
        align-items: center;
    }
}

/* ===== BUTTON SYSTEM ===== */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    letter-spacing: 0.025em;
}

.btn-primary {
    background: var(--color-button-primary);
    color: white;
    border-color: var(--color-button-primary);
}

.btn-primary:hover {
    background: var(--color-button-primary-hover);
    border-color: var(--color-button-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(22, 25, 37, 0.2);
}

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

.btn-secondary:hover {
    background: var(--color-button-secondary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(64, 110, 142, 0.2);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--color-navy-deep);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

.footer-text {
    font-size: 0.95rem;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    font-size: 0.95rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

/* ===== SKIP LINK ===== */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent-primary);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    font-weight: 600;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 3px solid var(--color-accent-primary);
    outline-offset: 3px;
    box-shadow: 0 0 0 3px rgba(64, 110, 142, 0.2);
}

.nav-link:focus {
    background: var(--color-accent-secondary);
    color: var(--color-text-primary);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .project-card {
        border: 2px solid var(--color-border-strong);
    }
}

/* ===== SMOOTH SCROLLING & POLISH ===== */
html {
    scroll-padding-top: 80px;
}

/* Selection styling */
::selection {
    background: var(--color-accent-secondary);
    color: var(--color-text-primary);
}