/* Design tokens */
:root {
    --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
    --font-serif: "Source Serif 4", Georgia, serif;
    --color-bg: #f8f7f4;
    --color-surface: #ffffff;
    --color-text: #1a2332;
    --color-text-muted: #5c6b7a;
    --color-border: #e2e6eb;
    --color-accent: #c45c26;
    --color-accent-hover: #a34a1e;
    --color-nav-bg: rgba(248, 247, 244, 0.92);
    --color-hero-bg: #1a2332;
    --color-hero-text: #f8f7f4;
    --shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.06);
    --shadow-md: 0 8px 24px rgba(26, 35, 50, 0.08);
    --radius: 12px;
    --max-width: 920px;
    --nav-height: 4rem;
}

[data-theme="dark"] {
    --color-bg: #0f1419;
    --color-surface: #1a2332;
    --color-text: #e8ecf0;
    --color-text-muted: #9aa8b5;
    --color-border: #2d3a4a;
    --color-nav-bg: rgba(15, 20, 25, 0.94);
    --color-hero-bg: #0a0e12;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
}

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 1.05rem;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    padding: 0.5rem 1rem;
    background: var(--color-accent);
    color: white;
    border-radius: 4px;
    z-index: 200;
}

.skip-link:focus {
    top: 1rem;
}

/* Site nav */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    background: var(--color-nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.site-nav__brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text);
    text-decoration: none;
}

.site-nav__brand:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.site-nav__links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav__links a {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    text-decoration: none;
}

.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] {
    color: var(--color-text);
    background: var(--color-border);
    text-decoration: none;
}

.site-nav__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-toggle,
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    font-size: 1.1rem;
}

.nav-toggle {
    display: none;
}

.theme-toggle__icon-dark { display: none; }
[data-theme="dark"] .theme-toggle__icon-light { display: none; }
[data-theme="dark"] .theme-toggle__icon-dark { display: inline; }

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

    .site-nav__links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        padding: 1rem;
        background: var(--color-nav-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }

    .site-nav__links.is-open {
        display: flex;
    }

    .site-nav__links a {
        width: 100%;
        padding: 0.75rem 1rem;
    }
}

/* Hero */
.hero {
    background: var(--color-hero-bg);
    color: var(--color-hero-text);
    padding: 4rem 1.5rem 5rem;
    text-align: center;
}

.hero__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero__img {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid rgba(255, 255, 255, 0.2);
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-md);
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 600;
    margin: 0 0 0.75rem;
    letter-spacing: -0.02em;
}

.hero__tagline {
    font-size: 1.15rem;
    opacity: 0.9;
    max-width: 36rem;
    margin: 0 auto 1.75rem;
    line-height: 1.5;
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.65rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

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

.btn--primary:hover {
    background: var(--color-accent-hover);
    color: white;
}

.btn--ghost {
    background: transparent;
    color: var(--color-hero-text);
    border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn--ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

/* Main layout */
.page-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

.section {
    margin-bottom: 3rem;
}

.section__header {
    margin-bottom: 1.25rem;
}

.section h2 {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 600;
    margin: 0 0 0.35rem;
    color: var(--color-text);
}

.section__lead {
    color: var(--color-text-muted);
    margin: 0;
    font-size: 1rem;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

/* Contact list */
.contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.65rem;
}

.contact-list img {
    width: 18px;
    height: 18px;
    object-fit: contain;
}

/* Badges */
.badges {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.badges li {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 0.88rem;
    color: var(--color-text);
}

.badge-icon {
    width: 16px;
    height: 16px;
    object-fit: contain;
}

/* CV timeline */
.cv-timeline {
    list-style: none;
    margin: 0;
    padding: 0 0 0 1.5rem;
    border-left: 2px solid var(--color-border);
}

.cv-item {
    position: relative;
    margin-bottom: 2.5rem;
    padding-left: 2.5rem;
}

.cv-item:last-child {
    margin-bottom: 0;
}

.cv-logo {
    position: absolute;
    left: -1.35rem;
    top: 0;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 8px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    object-fit: contain;
    padding: 2px;
    box-shadow: var(--shadow-sm);
}

.cv-item h3 {
    margin: 0 0 0.25rem;
    font-size: 1.2rem;
}

.job-title {
    font-weight: 600;
    margin: 1rem 0 0.15rem;
    color: var(--color-text);
}

.job-meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin: 0 0 0.75rem;
}

.cv-item ul {
    margin: 0;
    padding-left: 1.25rem;
}

.cv-item li {
    margin-bottom: 0.35rem;
}

/* Recommendations accordion */
.recommendation {
    margin-bottom: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--color-surface);
}

.recommendation summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.recommendation summary::-webkit-details-marker {
    display: none;
}

.recommendation summary::after {
    content: "+";
    font-size: 1.25rem;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.recommendation[open] summary::after {
    content: "−";
}

.recommendation__body {
    padding: 0 1.25rem 1.25rem;
    border-top: 1px solid var(--color-border);
}

.recommendation-text p {
    font-style: italic;
    color: var(--color-text-muted);
    margin: 0 0 0.75rem;
}

.recommendation-author {
    margin: 1rem 0 0;
    font-size: 0.9rem;
}

.recommendation-meta {
    display: block;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-top: 0.25rem;
    font-weight: normal;
}

/* Publications */
.publication {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
}

.publication:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.publication-title {
    font-weight: 600;
    margin: 0 0 0.25rem;
}

.publication-meta {
    font-style: italic;
    color: var(--color-text-muted);
    margin: 0 0 0.25rem;
    font-size: 0.95rem;
}

/* Blog cards */
.blog-grid {
    display: grid;
    gap: 1.25rem;
}

@media (min-width: 640px) {
    .blog-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }
}

.blog-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.35rem;
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
    height: 100%;
}

.blog-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
    text-decoration: none;
    color: inherit;
}

.blog-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.6rem;
}

.blog-card__tag {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15rem 0.5rem;
    background: var(--color-bg);
    border-radius: 4px;
    color: var(--color-text-muted);
}

.blog-card h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    margin: 0 0 0.5rem;
    color: var(--color-text);
}

.blog-card__excerpt {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin: 0 0 1rem;
    flex: 1;
}

.blog-card__date {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: auto;
}

.blog-card__read {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-accent);
    margin-top: 0.5rem;
}

/* Blog article page */
.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 4vw, 2.35rem);
    margin: 0 0 0.75rem;
    line-height: 1.25;
}

.article-meta {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.article-body h2 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    margin: 2rem 0 0.75rem;
}

.article-body h3 {
    font-size: 1.1rem;
    margin: 1.5rem 0 0.5rem;
}

.article-body p,
.article-body li {
    color: var(--color-text);
}

.article-body blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.25rem;
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    color: var(--color-text-muted);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* Blog filters */
.blog-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.filter-btn {
    padding: 0.35rem 0.85rem;
    font-size: 0.88rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface);
    color: var(--color-text-muted);
    cursor: pointer;
    font-family: inherit;
}

.filter-btn:hover,
.filter-btn.is-active {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-bg);
}

/* Footer */
.site-footer {
    text-align: center;
    padding: 2rem 1.5rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.site-footer a {
    color: var(--color-text-muted);
}

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

/* Page title (blog index) */
.page-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin: 0 0 0.5rem;
}

.page-intro {
    color: var(--color-text-muted);
    max-width: 40rem;
    margin: 0 0 2rem;
}

/* Two-column skills on wide screens */
.skills-grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 700px) {
    .skills-grid {
        grid-template-columns: 1fr 1fr;
    }
}
.blog-grid--loading { min-height: 8rem; opacity: 0.6; }

/* Döner Index dashboard */
.doner-hero {
    background: linear-gradient(135deg, var(--color-hero-bg) 0%, #2a3544 100%);
    color: var(--color-hero-text);
    padding: 2.5rem 1.5rem;
    margin: calc(-1 * var(--nav-height)) 0 2rem;
    padding-top: calc(var(--nav-height) + 2rem);
}

.doner-hero h1 {
    font-family: var(--font-serif);
    margin: 0 0 0.5rem;
    font-size: clamp(1.75rem, 4vw, 2.35rem);
}

.doner-hero__lead {
    opacity: 0.9;
    max-width: 42rem;
    margin: 0;
}

.doner-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0 2rem;
}

.doner-stat {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow-sm);
}

.doner-stat__label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin: 0 0 0.25rem;
}

.doner-stat__value {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    color: var(--color-accent);
}

.doner-chart-card {
    margin-bottom: 2rem;
}

.doner-chart-wrap {
    position: relative;
    height: 320px;
    max-width: 100%;
}

.doner-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.doner-table th,
.doner-table td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

.doner-table th {
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
}

.doner-badge {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

.doner-badge--anchor {
    opacity: 0.85;
}

.doner-methodology {
    font-size: 0.92rem;
    color: var(--color-text-muted);
}

.doner-methodology ul {
    margin: 0.5rem 0 0;
    padding-left: 1.25rem;
}