/* ═══════════════════════════════════════════════════════════════
   Portfolio — Design Tokens & Base
   BEM • Token-driven • Dark/Light theme
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Colors — Dark (default) */
  --color-bg: #0a0a0f;
  --color-bg-elevated: #12121a;
  --color-bg-card: #16161f;
  --color-surface: #1a1a26;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #f0f0f5;
  --color-text-muted: #a0a0b0;
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-muted: rgba(99, 102, 241, 0.2);

  /* Typography */
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Layout */
  --container-max: 72rem;
  --nav-height: 4rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

[data-theme="light"] {
  --color-bg: #f8f9fc;
  --color-bg-elevated: #ffffff;
  --color-bg-card: #ffffff;
  --color-surface: #f0f2f8;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-text: #1a1a26;
  --color-text-muted: #5a5a6e;
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-accent-muted: rgba(79, 70, 229, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

main {
  position: relative;
  z-index: 1;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 500;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--space-4);
}

/* ═══════════════════════════════════════════════════════════════
   Navigation
   ═══════════════════════════════════════════════════════════════ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
[data-theme="light"] .nav {
  background: rgba(248, 249, 252, 0.9);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
}

.nav__logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
}
.nav__logo-symbol { color: var(--color-accent); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}
.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.nav__menu {
  display: flex;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast), outline var(--transition-fast);
}
.nav__link:hover { color: var(--color-text); }
.nav__link:focus-visible {
  color: var(--color-text);
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}
.nav__link--active {
  color: var(--color-accent);
  font-weight: 600;
  position: relative;
}
.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-1);
  right: var(--space-1);
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.theme-toggle:hover { background: var(--color-bg-elevated); }

.theme-toggle__icon--sun { display: none; }
.theme-toggle__icon--moon { display: block; }
[data-theme="light"] .theme-toggle__icon--sun { display: block; }
[data-theme="light"] .theme-toggle__icon--moon { display: none; }

@media (max-width: 768px) {
  .nav__toggle { display: flex; }
  .nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: var(--space-6);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-4);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }
  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

/* ═══════════════════════════════════════════════════════════════
   Layout
   ═══════════════════════════════════════════════════════════════ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-16) 0;
}
.section__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.section__title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.2em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--color-accent), #8b5cf6);
  flex-shrink: 0;
}
.section__subtitle {
  margin: 0 0 var(--space-10);
  font-size: var(--text-base);
  color: var(--color-text-muted);
}

/* ═══════════════════════════════════════════════════════════════
   Hero
   ═══════════════════════════════════════════════════════════════ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--nav-height) var(--space-6) var(--space-16);
}

.hero__container {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 42rem;
}

/* Hero scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-base), visibility var(--transition-base);
}
.hero__scroll-indicator.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.hero__scroll-indicator:hover,
.hero__scroll-indicator:focus-visible {
  color: var(--color-accent);
  opacity: 1;
}
.hero__scroll-indicator:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-md);
}
.hero__scroll-mouse {
  display: block;
  width: 24px;
  height: 38px;
  border: 2px solid currentColor;
  border-radius: 12px;
  position: relative;
  opacity: 0.7;
}
.hero__scroll-wheel {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: currentColor;
  border-radius: 2px;
  animation: scrollBounce 2s ease-in-out infinite;
}
@media (prefers-reduced-motion: reduce) {
  .hero__scroll-wheel { animation: none; }
}
@keyframes scrollBounce {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.4; transform: translateX(-50%) translateY(8px); }
}

.terminal {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: visible;
  box-shadow: var(--shadow-card);
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.terminal__dots { display: flex; gap: 6px; }
.terminal__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.terminal__dot--red { background: #ff5f56; }
.terminal__dot--yellow { background: #ffbd2e; }
.terminal__dot--green { background: #27c93f; }
.terminal__title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.terminal__body {
  padding: var(--space-6);
  background: var(--color-bg-card);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  position: relative;
}
.terminal__line {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.terminal__line:last-child { margin-bottom: 0; }
.terminal__prompt {
  color: var(--color-accent);
  flex-shrink: 0;
}
.terminal__text { color: var(--color-text); }
.terminal__line--output { margin-left: var(--space-6); }
.terminal__cursor {
  color: var(--color-accent);
  animation: blink 1s step-end infinite;
}

/* Terminal interactive input */
.terminal__input-line {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  position: relative;
}

.terminal__input-wrap {
  flex: 1;
  position: relative;
  z-index: 21;
}

.terminal__input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  caret-color: transparent;
  padding: var(--space-1) 0;
}

.terminal__input-wrap::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 1.2em;
  background: var(--color-accent);
  border-radius: 1px;
  animation: blink 1s step-end infinite;
  pointer-events: none;
  left: var(--cursor-x, 0px);
}

.terminal__input::placeholder {
  color: var(--color-text-muted);
  opacity: 0.5;
}

.terminal__suggestions {
  position: absolute;
  left: 0;
  top: calc(100% + 4px);
  min-width: 240px;
  max-width: 340px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  padding: var(--space-2) 0;
  display: none;
  z-index: 20;
  max-height: 260px;
  overflow-y: auto;
}

.terminal__suggestions.is-visible {
  display: block;
}

.terminal__suggestion {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  transition: background 0.15s ease;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.terminal__suggestion:hover,
.terminal__suggestion.is-active {
  background: rgba(99, 102, 241, 0.1);
}

.terminal__suggestion-cmd {
  color: var(--color-accent);
  font-weight: 500;
  white-space: nowrap;
}

.terminal__suggestion-desc {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Terminal output area */
.terminal__output {
  margin-top: var(--space-3);
  max-height: 280px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
  scroll-behavior: smooth;
}

.terminal__output:empty {
  display: none;
}

.terminal__result {
  padding: var(--space-2) 0;
  border-top: 1px solid var(--color-border);
  animation: termFadeIn 0.3s ease;
}

.terminal__result-cmd {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.terminal__result-cmd span {
  color: var(--color-accent);
}

.terminal__result-body {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.6;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.terminal__result-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.terminal__result-body a:hover {
  opacity: 0.8;
}

.terminal__result-body .terminal__success {
  color: #27c93f;
}

.terminal__result-body .terminal__warning {
  color: #ffbd2e;
}

.terminal__result-body .terminal__error {
  color: #ff5f56;
}

/* ═══════════════════════════════════════════════════════════════
   Space Impact mini-oyun — terminal içinde ASCII renderer
   ═══════════════════════════════════════════════════════════════ */
.terminal__game {
  margin-top: var(--space-2);
  padding: var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  user-select: none;
  -webkit-user-select: none;
}

.terminal__game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px dashed var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.terminal__game-header b {
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0;
  text-transform: none;
}

.terminal__game-screen {
  margin: 0;
  padding: 0;
  white-space: pre;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.05;
  letter-spacing: 0;
  color: var(--color-accent);
  /* ASCII karakterlerin ligature ile birle\u015fmesini engelle (\u00f6r. --> \u2192 \u2192) */
  font-variant-ligatures: none;
  -webkit-font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "clig" 0, "calt" 0;
  text-shadow: 0 0 6px rgba(99, 102, 241, 0.25);
  overflow-x: auto;
  cursor: default;
}

[data-theme="light"] .terminal__game-screen {
  text-shadow: none;
}

.terminal__game-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px dashed var(--color-border);
}

.terminal__game-hint {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.terminal__game-controls {
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
}

.terminal__game-btn {
  padding: 0.4rem 0.7rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 120ms ease, background-color 150ms, border-color 150ms, color 150ms;
  min-width: 2.25rem;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.terminal__game-btn:hover,
.terminal__game-btn:focus-visible {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  outline: none;
}

.terminal__game-btn:active {
  transform: scale(0.94);
}

.terminal__game-btn--fire {
  color: #ff5f56;
}
.terminal__game-btn--fire:hover,
.terminal__game-btn--fire:focus-visible {
  background: #ff5f56;
  border-color: #ff5f56;
  color: #fff;
}

.terminal__game-btn--exit {
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .terminal__game-screen {
    font-size: 0.62rem;
    line-height: 1;
  }
  .terminal__game-hint {
    display: none;
  }
  .terminal__game-controls {
    width: 100%;
    justify-content: space-between;
  }
  .terminal__game-btn {
    flex: 1;
    min-width: 0;
    padding: 0.5rem 0.4rem;
  }
}

@keyframes termFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes blink {
  50% { opacity: 0; }
}

/* Crash effect (easter egg) */
@keyframes crashShake {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-8px, -4px); }
  20% { transform: translate(8px, 4px); }
  30% { transform: translate(-6px, 6px); }
  40% { transform: translate(6px, -6px); }
  50% { transform: translate(-4px, -2px); }
  60% { transform: translate(4px, 2px); }
  70% { transform: translate(-2px, 4px); }
  80% { transform: translate(2px, -4px); }
  90% { transform: translate(-1px, 1px); }
}

@keyframes crashOverlay {
  0% { opacity: 0; }
  15% { opacity: 1; }
  30% { opacity: 0.3; }
  45% { opacity: 1; }
  60% { opacity: 0.5; }
  75% { opacity: 1; }
  90% { opacity: 0.8; }
  100% { opacity: 0; }
}

@keyframes crashGlitch {
  0%, 100% { opacity: 1; transform: translateX(0); }
  20% { opacity: 0.7; transform: translateX(-3px); }
  40% { opacity: 1; transform: translateX(2px); }
  60% { opacity: 0.8; transform: translateX(-1px); }
  80% { opacity: 1; transform: translateX(1px); }
}

body.crash-shake {
  animation: crashShake 0.6s ease-in-out;
}

.crash-overlay {
  position: fixed;
  inset: 0;
  z-index: 99999;
  background: linear-gradient(180deg, #1a0a0a 0%, #0d0000 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  color: #ff4444;
  animation: crashOverlay 2s ease-out forwards;
  pointer-events: none;
}

.crash-overlay__text {
  font-size: clamp(0.9rem, 3vw, 1.2rem);
  text-align: center;
  line-height: 1.6;
  margin: 0;
  opacity: 0.9;
}

.crash-overlay__error {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 700;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
  text-shadow: 0 0 20px rgba(255, 68, 68, 0.5);
  animation: crashGlitch 0.4s ease-in-out 2;
}

.hero__title {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
}
.hero__name { color: var(--color-accent); }
.hero__expertise-list {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.hero__expertise-link {
  display: inline-block;
  margin-top: var(--space-3);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

/* Full-page background (canvas + ambient orbs) */
.page-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-bg__canvas {
  z-index: 0;
  /* LCP koruması: Pixi yüklenmeden canvas LCP candidate olarak sayılmasın
     diye opacity 0 ile başlat, JS .is-ready eklediğinde fade-in. */
  opacity: 0;
  transition: opacity 600ms ease-out;
}
.page-bg__canvas.is-ready {
  opacity: 1;
}

.page-bg__ambient {
  z-index: 0;
  overflow: hidden;
}

.page-bg__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}

.page-bg__orb--1 {
  width: 400px;
  height: 400px;
  background: var(--color-accent);
  top: -100px;
  right: -100px;
}

.page-bg__orb--2 {
  width: 300px;
  height: 300px;
  background: #8b5cf6;
  bottom: 20%;
  left: -80px;
}

.page-bg__orb--3 {
  width: 200px;
  height: 200px;
  background: #06b6d4;
  bottom: -50px;
  right: 20%;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}
.btn--primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}
.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--outline:hover {
  background: var(--color-surface);
  border-color: var(--color-text-muted);
}
.btn--sm { padding: var(--space-2) var(--space-4); }
.btn--full { width: 100%; }

/* ═══════════════════════════════════════════════════════════════
   About — Professional profile card
   ═══════════════════════════════════════════════════════════════ */

.about {
  position: relative;
  z-index: 2;
}

.about__card {
  position: relative;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  z-index: 1;
}

.about__card-banner {
  position: relative;
  z-index: 0;
  height: 180px;
  background: linear-gradient(135deg, var(--color-accent) 0%, #8b5cf6 50%, #06b6d4 100%);
  opacity: 0.7;
}
[data-theme="light"] .about__card-banner {
  opacity: 0.55;
}

.about__card-header {
  position: relative;
  z-index: 1;
  display: flex;
  gap: var(--space-8);
  padding: 0 var(--space-10) var(--space-6);
  flex-wrap: wrap;
  align-items: flex-start;
}

.about__portrait-wrap {
  position: relative;
  z-index: 2;
  flex-shrink: 0;
  width: 176px;
  height: 176px;
  margin-top: -88px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--color-bg-card);
  background: var(--color-surface);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
[data-theme="light"] .about__portrait-wrap {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.about__portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about__card-info {
  flex: 1;
  min-width: 240px;
  padding-top: var(--space-4);
}

.about__name {
  margin: 0 0 var(--space-2);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.about__headline {
  margin: 0 0 var(--space-3);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-muted);
}

.about__location {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.about__icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
  opacity: 0.8;
}

.about__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.about__link-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}
.about__link-btn:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-accent-muted);
  color: var(--color-accent);
}
.about__link-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.about__card-body {
  padding: var(--space-8) var(--space-10) var(--space-10);
  border-top: 1px solid var(--color-border);
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.about__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.about__stat:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.12);
}

.about__stat-icon {
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.about__stat-number {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.about__stat-suffix {
  color: var(--color-accent);
  font-weight: 700;
  font-size: var(--text-lg);
}

.about__stat-label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.about__bio {
  margin-bottom: var(--space-8);
}

.about__subtitle {
  margin: 0 0 var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.about__text {
  margin: 0 0 var(--space-4);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-muted);
}

.about__text:last-child { margin-bottom: 0; }

.about__quote {
  margin: var(--space-8) 0;
  padding: 0;
  border: none;
  background: none;
}

.about__quote-text {
  margin: 0;
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-base);
  font-style: italic;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-accent-muted);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

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

.about__education .about__subtitle {
  margin-bottom: var(--space-3);
}

.about__languages {
  margin-top: var(--space-8);
}
.about__lang-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.about__lang {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.about__lang-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.about__lang-level {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.about__lang-level--native {
  color: var(--color-accent);
  font-weight: 500;
}

@media (max-width: 640px) {
  .about__card-banner {
    height: 120px;
  }
  .about__card-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 0 var(--space-6) var(--space-4);
  }
  .about__portrait-wrap {
    width: 140px;
    height: 140px;
    margin-top: -70px;
  }
  .about__card-info {
    width: 100%;
  }
  .about__location {
    justify-content: center;
  }
  .about__links {
    justify-content: center;
  }
  .about__card-body {
    padding: var(--space-6) var(--space-6) var(--space-8);
  }
  .about__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
}

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════════════════════
   Expertise
   ═══════════════════════════════════════════════════════════════ */

.expertise__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.expertise__card {
  position: relative;
  padding: var(--space-6);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.expertise__card:hover,
.expertise__card:focus-visible {
  border-color: var(--color-accent-muted);
  box-shadow: var(--shadow-card);
}
.expertise__card-canvas {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  overflow: hidden;
}
.expertise__card-icon {
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}
.expertise__card-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}
.expertise__card-desc {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.expertise__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}
.expertise__card-tags li {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  background: var(--color-accent-muted);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
}

/* ═══════════════════════════════════════════════════════════════
   Skills — Marquee
   ═══════════════════════════════════════════════════════════════ */

.skills__tech-marquee {
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 5%, black 95%, transparent);
}
.skills__tech-marquee:hover .skills__tech-track,
.skills__tech-marquee:focus-within .skills__tech-track {
  animation-play-state: paused;
}
@media (prefers-reduced-motion: reduce) {
  .skills__tech-track { animation: none; }
}

.skills__tech-track {
  display: flex;
  width: max-content;
  animation: marquee 60s linear infinite;
}
@media (max-width: 768px) {
  .skills__tech-track { animation-duration: 45s; }
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.skills__tech-stack {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-3);
  flex-shrink: 0;
}
@media (min-width: 768px) {
  .skills__tech-stack {
    gap: var(--space-6);
    padding: var(--space-4) var(--space-6);
  }
}

.skills__tech-tag {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  min-width: 5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: transform var(--transition-fast),
              border-color var(--transition-fast),
              background var(--transition-fast),
              box-shadow var(--transition-fast);
  will-change: transform;
}
.skills__tech-tag:hover {
  border-color: var(--color-accent-muted);
  background: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px -8px rgba(99, 102, 241, 0.45);
}
.skills__tech-tag:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.skills__tech-icon-wrap {
  position: relative;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.skills__tech-icon {
  width: 32px;
  height: 32px;
  display: block;
}
/* Tek-renk simpleicons SVG'leri light tema için invert ile koyulaştırılır.
   Renkli marka logoları (Slack, NATS) --no-filter ile bu kuralın dışında kalır. */
[data-theme="light"] .skills__tech-icon:not(.skills__tech-icon--no-filter) {
  filter: invert(1) brightness(0.15);
}

/* ═══════════════════════════════════════════════════════════════
   Projects
   ═══════════════════════════════════════════════════════════════ */

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-6);
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.project-card:hover {
  border-color: var(--color-accent-muted);
  box-shadow: var(--shadow-card);
}

.project-card__image {
  position: relative;
  aspect-ratio: 16/9;
  background: var(--color-surface);
}
.project-card__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}
.project-card__category {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  background: var(--color-accent-muted);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
}

.project-card__body { padding: var(--space-5); }
.project-card__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}
.project-card__desc {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}
.project-card__tech li {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  background: var(--color-surface);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
}

/* ═══════════════════════════════════════════════════════════════
   Experience — Timeline
   ═══════════════════════════════════════════════════════════════ */

.timeline {
  position: relative;
  max-width: 36rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent) 0%, #8b5cf6 40%, var(--color-border) 100%);
  border-radius: 1px;
}

.timeline__item {
  position: relative;
  padding-left: var(--space-8);
  padding-bottom: var(--space-8);
}
.timeline__item:last-child { padding-bottom: 0; }

.timeline__marker {
  position: absolute;
  left: -5px;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 2px solid var(--color-bg);
}

.timeline__item:first-child .timeline__marker {
  box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.5);
  animation: timeline-pulse 2s ease-in-out infinite;
}

@keyframes timeline-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.5);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(99, 102, 241, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
  }
}

.timeline__date {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}
.timeline__title {
  margin: 0 0 var(--space-4);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
}
.timeline__desc {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}
.timeline__list {
  margin: 0;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.timeline__list li {
  margin-bottom: var(--space-2);
}
.timeline__list li:last-child { margin-bottom: 0; }
.timeline__list strong { color: var(--color-text); }
.timeline__list em {
  font-style: normal;
  font-weight: 600;
  color: var(--color-accent);
}

.timeline__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}
.timeline__badges li {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  background: var(--color-accent-muted);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
}

/* ═══════════════════════════════════════════════════════════════
   Contact
   ═══════════════════════════════════════════════════════════════ */

.form-group {
  margin-bottom: var(--space-5);
}
.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}
.form-input::placeholder { color: var(--color-text-muted); }
.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
}
.form-input:invalid:not(:placeholder-shown) { border-color: #ef4444; }
.form-textarea {
  resize: vertical;
  min-height: 8rem;
}
.form-error {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: #ef4444;
}

/* ═══════════════════════════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════════════════════════ */

.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__socials {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.footer__social-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(99, 102, 241, 0.08);
}

@media (max-width: 640px) {
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ═══════════════════════════════════════════════════════════════
   Scroll Reveal Animations
   ═══════════════════════════════════════════════════════════════ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ═══════════════════════════════════════════════════════════════
   Cursor canvas (hidden by default)
   ═══════════════════════════════════════════════════════════════ */

#cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9998;
}

/* ═══════════════════════════════════════════════════════════════
   Scroll Progress Bar (üst kenarda ince accent çizgi)
   ═══════════════════════════════════════════════════════════════ */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  background: transparent;
  z-index: 1100;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), #8b5cf6 60%, #ec4899);
  transform-origin: left center;
  transition: width 80ms linear;
  box-shadow: 0 0 8px rgba(99, 102, 241, 0.5);
}

/* ═══════════════════════════════════════════════════════════════
   Project card placeholder — gradient + grid pattern
   ═══════════════════════════════════════════════════════════════ */

.project-card__image {
  background:
    radial-gradient(60% 80% at 30% 20%, rgba(99, 102, 241, 0.35), transparent 60%),
    radial-gradient(50% 70% at 80% 90%, rgba(139, 92, 246, 0.30), transparent 60%),
    linear-gradient(135deg, #1a1a26 0%, #12121a 100%);
}
[data-theme="light"] .project-card__image {
  background:
    radial-gradient(60% 80% at 30% 20%, rgba(99, 102, 241, 0.18), transparent 60%),
    radial-gradient(50% 70% at 80% 90%, rgba(236, 72, 153, 0.14), transparent 60%),
    linear-gradient(135deg, #ffffff 0%, #f0f2f8 100%);
}
.project-card__image::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}
[data-theme="light"] .project-card__image::before {
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
}
.project-card__placeholder {
  position: relative;
  z-index: 1;
  color: var(--color-accent);
  opacity: 0.85;
  transition: transform var(--transition-base);
}
.project-card:hover .project-card__placeholder {
  transform: scale(1.08);
}

/* ═══════════════════════════════════════════════════════════════
   Mobile / Responsive iyileştirmeleri
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  /* Bölüm dikey aralıklarını biraz sıkılaştır */
  .section { padding: var(--space-12) 0; }
  .section__title { font-size: var(--text-xl); }

  /* Container daha az yan boşluk */
  .container { padding: 0 var(--space-4); }

  /* Hero terminali küçük ekranda taşmasın */
  .hero__container { padding: 0 var(--space-3); }
  .terminal__body { font-size: var(--text-sm); }

  /* Tech tag'lar mobilde daha kompakt */
  .skills__tech-tag {
    min-width: 4.25rem;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    gap: var(--space-1);
  }
  .skills__tech-icon,
  .skills__tech-icon-wrap { width: 26px; height: 26px; }
}

@media (max-width: 640px) {
  /* Timeline mobilde daha ferah */
  .timeline__item { padding-left: var(--space-6); }
  .timeline__title { font-size: var(--text-base); }
  .timeline__list { padding-left: var(--space-4); }

  /* Project grid tek sütun */
  .projects__grid { grid-template-columns: 1fr; }

  /* About link butonları hizada kalsın */
  .about__links { gap: var(--space-2); flex-wrap: wrap; }
}