/*
 * İsmet Aslan Acar — Executive Portfolio
 * 
 * Design System:
 * - Palette: Navy + White + Gold (classic authority)
 * - Typography: Montserrat (headlines) + Playfair Display (accent/serif)
 * - Spacing: 8px rhythm (Material Design standard)
 * - Target: Core Web Vitals (LCP ≤2.5s, CLS ≤0.1)
 */

/* ================================
   1. Design Tokens
   ================================ */
:root {
    /* Color Palette: Deep Forest Green + Warm Gold (AcarVerde story) */
    --green-950: #0a1a14;
    --green-900: #0f2920;
    --green-800: #14382c;
    --green-700: #1a4738;
    --green-600: #235e49;
    
    --gold-500: #d4a84b;
    --gold-400: #e0ba5e;
    --gold-300: #eacd7d;
    
    --white: #ffffff;
    --warm-white: #fdfcfa;
    --cream: #f5f3ef;
    --sand-400: #c4bfb5;
    --sand-500: #9a958b;
    --sand-600: #706b63;
    
    /* Semantic Colors */
    --color-bg: var(--green-950);
    --color-bg-elevated: var(--green-900);
    --color-bg-card: var(--green-800);
    
    --color-text: var(--warm-white);
    --color-text-secondary: var(--sand-400);
    --color-text-muted: var(--sand-500);
    
    --color-accent: var(--gold-500);
    --color-accent-hover: var(--gold-400);
    
    --color-border: rgba(212, 168, 75, 0.12);
    --color-border-strong: rgba(212, 168, 75, 0.25);
    
    /* Typography Scale (1.25 ratio) */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 2rem;        /* 32px */
    --text-4xl: 2.5rem;      /* 40px */
    --text-5xl: 3.5rem;      /* 56px */
    
    /* Spacing (8px base) */
    --space-1: 0.25rem;      /* 4px */
    --space-2: 0.5rem;       /* 8px */
    --space-3: 0.75rem;      /* 12px */
    --space-4: 1rem;         /* 16px */
    --space-5: 1.5rem;       /* 24px */
    --space-6: 2rem;         /* 32px */
    --space-8: 3rem;         /* 48px */
    --space-10: 4rem;        /* 64px */
    --space-12: 5rem;        /* 80px */
    --space-16: 8rem;        /* 128px */
    
    /* Fonts */
    --font-sans: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    
    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.15;
    --leading-snug: 1.35;
    --leading-normal: 1.5;
    --leading-relaxed: 1.65;
    
    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 150ms;
    --duration-base: 250ms;
    
    /* Focus Ring */
    --focus-ring: 0 0 0 3px rgba(201, 162, 39, 0.4);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* ================================
   2. Reset & Base
   ================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: 400;
    line-height: var(--leading-relaxed);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus States (WCAG 2.2) */
:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    padding: var(--space-3) var(--space-5);
    background: var(--color-accent);
    color: var(--navy-900);
    font-weight: 600;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
    transition: top var(--duration-fast);
}

.skip-link:focus {
    top: var(--space-4);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

/* ================================
   3. Container
   ================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-inline: var(--space-5);
}

/* ================================
   4. Navigation
   ================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    background: rgba(10, 26, 20, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-logo {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.2em;
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--duration-fast);
}

.nav-links a:hover {
    color: var(--color-text);
}

.nav-cta {
    padding: var(--space-2) var(--space-5);
    background: var(--color-accent);
    color: var(--green-950) !important;
    font-weight: 600;
    border-radius: 4px;
    transition: background var(--duration-fast), transform var(--duration-fast);
}

.nav-cta:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-accent);
    transition: transform var(--duration-fast);
}

.nav-toggle.open span:first-child {
    transform: rotate(45deg) translate(3px, 3px);
}

.nav-toggle.open span:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: 1px solid var(--color-border-strong);
    border-radius: 4px;
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all var(--duration-fast);
    margin-left: var(--space-4);
}

.lang-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.lang-current {
    color: inherit;
}

/* ================================
   5. Hero Section
   ================================ */
.hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-16) var(--space-6) var(--space-10);
    background: linear-gradient(165deg, var(--green-900) 0%, var(--green-950) 50%, var(--green-950) 100%);
}

.hero-content {
    max-width: 720px;
}

.hero-eyebrow {
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl));
    font-weight: 500;
    line-height: var(--leading-tight);
    color: var(--color-text);
    margin-bottom: var(--space-5);
}

.hero-sub {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
    max-width: 560px;
    margin-bottom: var(--space-8);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.hero-stats {
    display: flex;
    gap: var(--space-10);
    margin-top: auto;
    padding-top: var(--space-12);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-serif);
    font-size: var(--text-4xl);
    font-weight: 500;
    color: var(--color-accent);
    line-height: var(--leading-none);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-top: var(--space-2);
}

/* ================================
   6. Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    min-height: 48px;
    border: none;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--green-950);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border-strong);
}

.btn-ghost:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ================================
   7. Trust Bar
   ================================ */
.trust-bar {
    padding: var(--space-6) 0;
    background: var(--green-900);
    border-bottom: 1px solid var(--color-border);
}

.trust-bar .container {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.trust-label {
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.trust-logos {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    flex-wrap: wrap;
}

.trust-logo {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    opacity: 0.7;
    transition: opacity var(--duration-fast);
}

a.trust-logo:hover {
    opacity: 1;
    color: var(--color-accent);
}

/* ================================
   8. Section Headers
   ================================ */
.section-label {
    display: block;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.section-header {
    margin-bottom: var(--space-10);
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
    font-weight: 500;
    color: var(--color-text);
    line-height: var(--leading-tight);
    margin-bottom: var(--space-4);
}

.section-header-center {
    text-align: center;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-intro {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
}

/* ================================
   9. About Section
   ================================ */
.about {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: var(--space-12);
    align-items: start;
}

.about-image {
    position: sticky;
    top: 100px;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.about-content h2 {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
    font-weight: 500;
    color: var(--color-text);
    line-height: var(--leading-snug);
    margin-bottom: var(--space-6);
}

.about-content .lead {
    font-size: var(--text-lg);
    color: var(--color-text);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-5);
}

.about-content p {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-4);
}

.about-content blockquote {
    margin: var(--space-8) 0;
    padding-left: var(--space-5);
    border-left: 3px solid var(--color-accent);
}

.about-content blockquote p {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    font-style: italic;
    color: var(--color-text);
    line-height: var(--leading-snug);
}

.about-cta {
    margin-top: var(--space-8);
}

/* ================================
   10. Work / Projects Section
   ================================ */
.work {
    padding: var(--space-16) 0;
    background: var(--green-900);
}

.projects {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.project {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--space-8);
    position: relative;
    transition: border-color var(--duration-base);
}

.project:hover {
    border-color: var(--color-border-strong);
}

.project-featured {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, var(--color-bg) 0%, rgba(201, 162, 39, 0.03) 100%);
}

.project-badge {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    padding: var(--space-1) var(--space-3);
    background: var(--color-accent);
    color: var(--green-950);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 4px;
}

.project-header {
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

.project-era {
    display: block;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-2);
}

.project-header h3 {
    font-family: var(--font-serif);
    font-size: var(--text-3xl);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.project-tagline {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
}

.project-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.detail {
    min-width: 0;
}

.detail-label {
    display: block;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
}

.detail p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

.detail strong {
    color: var(--color-text);
}

.detail ul {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

.detail li {
    position: relative;
    padding-left: var(--space-4);
    margin-bottom: var(--space-2);
}

.detail li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

/* ================================
   11. Legacy / Timeline Section
   ================================ */
.legacy {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}

.legacy-photo {
    max-width: 800px;
    margin: 0 auto var(--space-12);
    text-align: center;
}

.legacy-photo img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.legacy-photo-caption {
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    font-style: italic;
    color: var(--color-text-secondary);
}

.timeline {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-10);
}

.timeline-item {
    text-align: center;
    padding: var(--space-6);
}

.timeline-marker {
    margin-bottom: var(--space-5);
}

.timeline-year {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: var(--green-800);
    color: var(--color-accent);
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: 0.05em;
    border-radius: 4px;
}

.timeline-item-current .timeline-year {
    background: var(--color-accent);
    color: var(--green-950);
}

.timeline-content h3 {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-1);
}

.timeline-role {
    display: block;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-4);
}

.timeline-content p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
}

/* ================================
   12. Quote Section
   ================================ */
.quote-section {
    padding: var(--space-16) 0;
    background: var(--green-900);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.featured-quote {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.featured-quote p {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-xl), 3vw, var(--text-3xl));
    font-style: italic;
    font-weight: 400;
    color: var(--color-text);
    line-height: var(--leading-snug);
    margin-bottom: var(--space-6);
}

.featured-quote footer {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.featured-quote cite {
    font-style: normal;
    font-weight: 500;
}

/* ================================
   13. Contact Section
   ================================ */
.contact {
    padding: var(--space-16) 0;
    background: var(--color-bg);
}

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact h2 {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

.contact p {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

.contact-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    max-width: 400px;
    margin: 0 auto;
}

.contact-primary,
.contact-secondary {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    background: var(--green-900);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--duration-fast);
    min-height: 64px;
}

.contact-primary:hover,
.contact-secondary:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--green-800);
    border-radius: 8px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.contact-label {
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.contact-value {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text);
}

/* ================================
   14. Footer
   ================================ */
.footer {
    padding: var(--space-6) 0;
    background: var(--green-900);
    border-top: 1px solid var(--color-border);
}

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

.footer-parent {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--duration-fast);
}

.footer-parent:hover {
    color: var(--color-accent);
}

.footer-legal {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ================================
   15. Responsive Design
   ================================ */
@media (max-width: 1024px) {
    .project-details {
        grid-template-columns: 1fr;
        gap: var(--space-5);
    }
    
    .timeline {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .timeline-item {
        text-align: left;
        padding: var(--space-5);
        background: var(--green-900);
        border-radius: 8px;
        display: flex;
        gap: var(--space-5);
        align-items: flex-start;
    }
    
    .timeline-marker {
        margin-bottom: 0;
        flex-shrink: 0;
    }
}

@media (max-width: 768px) {
    .nav {
        padding: var(--space-3) var(--space-4);
    }
    
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: var(--space-5);
        gap: var(--space-4);
        display: none;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-links.open {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-cta {
        width: 100%;
        text-align: center;
        padding: var(--space-3) var(--space-5);
    }
    
    .lang-toggle {
        width: 100%;
        justify-content: center;
        margin-left: 0;
        margin-top: var(--space-2);
        padding: var(--space-3);
    }
    
    .hero {
        padding: var(--space-12) var(--space-4) var(--space-8);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--space-6);
        padding-top: var(--space-8);
        align-items: center;
        text-align: center;
    }
    
    .stat {
        align-items: center;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .trust-bar .container {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .trust-logos {
        justify-content: center;
        gap: var(--space-5);
    }
    
    .about,
    .work,
    .legacy,
    .contact {
        padding: var(--space-12) 0;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .about-image {
        position: static;
        order: -1;
    }
    
    .project {
        padding: var(--space-5);
    }
    
    .project-badge {
        position: static;
        display: inline-block;
        margin-bottom: var(--space-3);
    }
    
    .section-header {
        margin-bottom: var(--space-8);
    }
    
    .quote-section {
        padding: var(--space-12) 0;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }
}

/* ================================
   16. Scroll Margin
   ================================ */
section[id] {
    scroll-margin-top: 80px;
}

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

/* ================================
   18. Print Styles
   ================================ */
@media print {
    .nav,
    .skip-link,
    .nav-toggle {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero,
    .about,
    .work,
    .legacy,
    .contact {
        padding: 2rem 0;
    }
}