/* ============================================
   Kerem Özben — CV Portfolio Website
   Screen Stylesheet
   ============================================ */

/* --- Google Fonts --- */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

/* --- CSS Custom Properties --- */
:root {
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #6b6b6b;
  --color-bg: #ffffff;
  --color-bg-subtle: #f7f7f8;
  --color-border: #e2e2e5;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-tag-bg: #f0f0f3;
  --color-tag-border: #d4d4d8;

  --font-family:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-base: 15px;
  --font-size-sm: 13px;
  --font-size-xs: 12px;
  --font-size-lg: 17px;
  --font-size-xl: 20px;
  --font-size-2xl: 28px;
  --font-size-3xl: 34px;

  --line-height: 1.6;
  --max-width: 800px;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
}

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* --- Page Container --- */
.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
}

/* --- Language Toggle --- */
.lang-toggle {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  display: flex;
  gap: 2px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 3px;
  z-index: 100;
  font-size: var(--font-size-xs);
}

.lang-toggle a {
  display: block;
  padding: 5px 14px;
  border-radius: 6px;
  color: var(--color-text-muted);
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
}

.lang-toggle a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.lang-toggle a.active {
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  font-weight: 600;
}

/* --- Header --- */
.cv-header {
  padding-bottom: var(--spacing-xl);
  border-bottom: 2px solid var(--color-text);
  margin-bottom: var(--spacing-xl);
}

.cv-header h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.2;
  margin-bottom: var(--spacing-xs);
}

.cv-header .title {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-md);
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.contact-info span {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.contact-info .icon {
  font-size: var(--font-size-base);
  line-height: 1;
}

.summary-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.7;
  max-width: 680px;
}

.summary-bullets li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 4px;
}

.summary-bullets li::before {
  content: "\2022";
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
}

/* --- Sections --- */
.cv-section {
  margin-bottom: var(--spacing-2xl);
}

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

.section-title {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

/* --- Skills --- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md) var(--spacing-xl);
}

.skills-group {
  margin-bottom: 0;
}

.skills-group-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.skill-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-tag-bg);
  border: 1px solid var(--color-tag-border);
  border-radius: 6px;
  white-space: nowrap;
}

/* --- Experience --- */
.experience-entry {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.experience-entry:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.experience-header {
  margin-bottom: var(--spacing-sm);
}

.experience-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
}

.experience-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.experience-meta .role {
  font-weight: 600;
  color: var(--color-text-secondary);
}

.experience-meta .separator {
  color: var(--color-border);
}

.experience-bullets {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-lg);
}

.experience-bullets li {
  list-style: disc;
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.experience-bullets li::marker {
  color: var(--color-border);
}

.early-career-companies {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

/* --- Footer --- */
.cv-footer {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
}

/* --- Responsive --- */
@media (max-width: 640px) {
  :root {
    --font-size-3xl: 26px;
    --font-size-2xl: 22px;
    --font-size-xl: 18px;
  }

  .page {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .contact-info {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .lang-toggle {
    position: static;
    margin-bottom: var(--spacing-md);
    align-self: flex-end;
    width: fit-content;
    margin-left: auto;
  }

  .experience-meta {
    flex-direction: column;
    gap: 2px;
  }

  .experience-meta .separator {
    display: none;
  }

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