/* =========================================================================
   Yilcay Birinci – CV / Portfolio
   Statisches Stylesheet: Layout, Typografie, Light/Dark, Responsive, Print
   Keine externen Requests (Fonts/Icons/CDN) – alles selbst gehostet.
   ========================================================================= */

:root {
  --color-bg: #f4f5f7;
  --color-surface: #eceef1;        /* Footer / abgesetzte Flächen */
  --color-card: #ffffff;           /* Karten, Kacheln */
  --color-border: #e2e5ea;
  --color-text: #1f2430;
  --color-text-soft: #565f70;
  --color-accent: #1d3a63;         /* dezentes Dunkelblau / Navy */
  --color-accent-hover: #16305a;
  --color-accent-contrast: #ffffff;
  --color-accent-soft: #eef2f8;

  --shadow-sm: 0 1px 2px rgba(20, 30, 55, 0.06), 0 2px 10px rgba(20, 30, 55, 0.05);
  --shadow-md: 0 6px 24px rgba(20, 30, 55, 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, "Noto Sans", sans-serif;

  --wrap-max: 820px;
  --space-section: 3.5rem;
  --radius: 8px;
  --radius-sm: 6px;
  --header-h: 3.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14171d;
    --color-surface: #1a1d24;
    --color-card: #1c2029;
    --color-border: #2c313c;
    --color-text: #e7e9ee;
    --color-text-soft: #a2abbd;
    --color-accent: #8fb4e8;
    --color-accent-hover: #a9c8f2;
    --color-accent-contrast: #10131a;
    --color-accent-soft: #1f2735;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.5);
  }
}

/* --------------------------------------------------------------- Reset --- */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  line-height: 1.25;
  font-weight: 650;
  color: var(--color-text);
}

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

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

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

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

/* ------------------------------------------------------------- Layout --- */

.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* --------------------------------------------------------------- Card --- */

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.4rem;
}

/* ------------------------------------------------------------- Header --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
}

.brand {
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.brand:hover {
  text-decoration: none;
}

.primary-nav ul {
  display: flex;
  gap: 1.25rem;
}

.primary-nav a {
  display: inline-block;
  padding: 0.35rem 0;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  border-bottom: 2px solid transparent;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--color-text);
  text-decoration: none;
}

.primary-nav a.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 1.1rem;
  height: 2px;
  margin: 0 auto;
  background: var(--color-text);
}

/* --------------------------------------------------------------- Hero --- */

.hero {
  padding: 3.5rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem;
  align-items: center;
}

.hero-eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-soft);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 2.75rem);
}

.hero-subtitle {
  margin: 0.35rem 0 0;
  font-size: 1.15rem;
  color: var(--color-accent);
  font-weight: 600;
}

.hero-claim {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  color: var(--color-text-soft);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: 1.5rem;
  font-size: 0.95rem;
}

.hero-links li {
  position: relative;
}

.hero-links li + li::before {
  content: "";
  position: absolute;
  left: -0.65rem;
  top: 0.4em;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-text-soft);
}

/* Profilfoto (Bild kommt separat; bis dahin Initialen-Platzhalter) */
.hero-photo {
  margin: 0;
}

.hero-photo-frame {
  position: relative;
  display: grid;
  place-items: center;
  width: clamp(140px, 34vw, 190px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  box-shadow: var(--shadow-md);
  border: 4px solid var(--color-card);
}

.hero-photo-frame::after {
  content: attr(data-initials);
  font-size: clamp(2.5rem, 9vw, 3.75rem);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.hero-photo-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-photo-frame.is-missing img {
  display: none;
}

/* ------------------------------------------------------------ Section --- */

.section {
  padding: var(--space-section) 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

.section h2 {
  margin: 0 0 1.75rem;
  font-size: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.prose-card p {
  margin: 0 0 1rem;
}

.prose-card p:last-child {
  margin-bottom: 0;
}

/* ---------------------------------------------------- Card-Liste (Edu) --- */

.card-list {
  display: grid;
  gap: 1rem;
}

.card-period {
  margin: 0 0 0.3rem;
  font-size: 0.85rem;
  color: var(--color-text-soft);
}

.card-period-note {
  white-space: nowrap;
}

.card h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
}

.card-org {
  margin: 0 0 0.35rem;
  color: var(--color-text);
  font-weight: 500;
}

.card-detail {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.95rem;
}

/* ------------------------------------------------ Timeline (Erfahrung) --- */

.exp-timeline {
  position: relative;
  display: grid;
  gap: 1.25rem;
  padding-left: 1.75rem;
}

.exp-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--color-border);
}

.exp-item {
  position: relative;
}

.exp-item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 0.55rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-bg);
}

/* ------------------------------------------------------- Skills-Kacheln --- */

.skills-group-title {
  margin: 2.25rem 0 1rem;
  font-size: 0.95rem;
  color: var(--color-text-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.skills-group-title:first-of-type {
  margin-top: 0;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
  gap: 0.75rem;
}

.skill-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 1rem 0.5rem;
  text-align: center;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-size: 0.85rem;
  color: var(--color-text);
  min-height: 104px;
}

.skill-icon {
  width: 26px;
  height: 26px;
  fill: currentColor;
  color: var(--color-accent);
  flex-shrink: 0;
}

.lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.lang-list li {
  padding: 0.35rem 0.8rem;
  background: var(--color-accent-soft);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--color-text);
}

/* --------------------------------------------------- Zertifikat-Karten --- */

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.cert-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.cert-card h3 {
  margin: 0;
  font-size: 1rem;
}

.cert-issuer {
  margin: 0 0 0.9rem;
  font-size: 0.78rem;
  color: var(--color-text-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.btn {
  align-self: flex-start;
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.95rem;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-accent-hover);
  color: var(--color-accent-contrast);
  text-decoration: none;
}

/* ------------------------------------------------------ Kontakt-Buttons --- */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(266px, 1fr));
  gap: 1rem;
}

.contact-btn {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 0.9rem;
  align-items: center;
  padding: 1rem 1.2rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
}

.contact-btn:hover,
.contact-btn:focus-visible {
  text-decoration: none;
  box-shadow: var(--shadow-md);
}

.contact-icon {
  grid-row: 1 / 3;
  width: 24px;
  height: 24px;
  fill: currentColor;
  color: var(--color-accent);
}

.contact-btn-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-soft);
}

.contact-btn-value {
  font-size: 0.95rem;
  word-break: break-word;
}

.contact-location {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: var(--color-text-soft);
  font-size: 0.95rem;
}

.contact-location svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  color: var(--color-accent);
}

/* -------------------------------------------------------------- Footer --- */

.site-footer {
  padding: 2rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-soft);
}

.site-footer p {
  margin: 0;
}

.footer-note {
  margin-top: 0.25rem;
}

/* ------------------------------------------------------ Scroll-to-Top --- */

.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
}

.to-top[hidden] {
  display: none;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@media (prefers-reduced-motion: reduce) {
  .to-top { transition: none; }
}

/* ---------------------------------------------------- Hover (Zeiger) --- */

@media (hover: hover) {
  .card,
  .skill-tile,
  .cert-card,
  .contact-btn {
    transition: box-shadow 0.18s ease, transform 0.18s ease;
  }

  .skill-tile:hover,
  .cert-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .card,
  .skill-tile,
  .cert-card,
  .contact-btn {
    transition: none;
  }

  .skill-tile:hover,
  .cert-card:hover {
    transform: none;
  }
}

/* --------------------------------------------------------- Responsive --- */

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
  }

  .primary-nav.is-open {
    display: block;
  }

  .primary-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
  }

  .primary-nav a {
    display: block;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  .primary-nav a.is-active {
    border-bottom-color: var(--color-border);
  }

  .header-inner {
    position: relative;
  }

  .hero {
    padding: 2.5rem 0;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 1.5rem;
  }

  .hero-photo {
    order: -1;
  }

  .skill-grid {
    grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  }

  .cert-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .exp-timeline {
    padding-left: 1.4rem;
  }

  .exp-item::before {
    left: -1.4rem;
  }
}

/* ------------------------------------------------------------- Print --- */

@media print {
  :root {
    --color-bg: #fff;
    --color-card: #fff;
    --color-surface: #fff;
    --color-text: #000;
    --color-text-soft: #333;
    --color-accent: #000;
    --color-accent-hover: #000;
    --color-accent-contrast: #000;
    --color-accent-soft: #fff;
    --color-border: #999;
    --shadow-sm: none;
    --shadow-md: none;
  }

  .site-header,
  .nav-toggle,
  .skip-link,
  .hero-eyebrow,
  .to-top {
    display: none !important;
  }

  body {
    font-size: 11pt;
    line-height: 1.4;
  }

  .wrap {
    max-width: none;
    padding: 0;
  }

  .hero {
    padding: 0 0 1rem;
  }

  .hero-inner {
    grid-template-columns: 1fr auto;
    gap: 1rem;
  }

  .hero-photo-frame {
    width: 2.6cm;
    border: 1px solid #999;
    box-shadow: none;
    filter: grayscale(1);
  }

  .section {
    padding: 0.9rem 0;
    break-inside: avoid;
  }

  .card,
  .skill-tile,
  .cert-card,
  .contact-btn {
    box-shadow: none;
    border: 1px solid #bbb;
    border-left: 2px solid #000;
    break-inside: avoid;
  }

  .skill-icon,
  .contact-icon,
  .contact-location svg {
    color: #000;
  }

  a {
    color: #000;
    text-decoration: none;
  }

  .exp-timeline {
    padding-left: 0;
  }

  .exp-timeline::before,
  .exp-item::before {
    display: none;
  }

  .btn {
    padding: 0;
    background: none;
    color: #000;
    font-weight: 500;
  }

  .cert-card .btn[href]::after,
  .contact-btn[href]::after {
    content: " – " attr(href);
    font-size: 8pt;
    color: #555;
    word-break: break-all;
  }

  .cert-card .btn span[aria-hidden] {
    display: none;
  }
}