/* ==========================================================================
   BAKAKI YUNUSU PORTFOLIO - MAIN STYLESHEET
   Dark-First, Modern, High Contrast, Responsive
   ========================================================================== */

:root {
  /* Color System - Dark Mode (Default) */
  --bg-primary: #0b0f17;
  --bg-secondary: #161f30;
  --bg-tertiary: #1e293b;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
  --accent-glow: rgba(56, 189, 248, 0.15);
  --card-bg: #111827;
  --card-border: #1f2937;
  
  /* Typography & Spacing */
  --font-main: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-tertiary: #e2e8f0;
  --border-color: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.15);
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography Elements */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.2;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

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

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

ul {
  list-style: none;
}

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

/* Layout Utilities */
.container {
  width: 90%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  text-align: center;
  margin-bottom: 0.5rem;
  position: relative;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  font-size: 1.1rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--accent);
  color: #0f172a;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-small {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

/* Navigation Header */
.header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

[data-theme="light"] .header {
  background-color: rgba(248, 250, 252, 0.85);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 5rem;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle, .mobile-toggle {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover, .mobile-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--accent);
}

.mobile-toggle {
  display: none;
}

/* Hero Section */
.hero-section {
  padding: 6rem 0 4rem;
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.hero-tag {
  display: inline-block;
  padding: 0.35rem 0.8rem;
  background-color: var(--accent-glow);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: -1px;
  margin-bottom: 0.75rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-description {
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 2rem;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}

.social-icon:hover {
  background-color: var(--accent);
  color: #0f172a;
  border-color: var(--accent);
  transform: translateY(-3px);
}

.hero-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.profile-container {
  width: 280px;
  height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow);
  background-color: var(--bg-secondary);
}

@media (min-width: 576px) {
  .profile-container {
    width: 320px;
    height: 320px;
  }
}

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

.profile-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 1.5rem;
  text-align: center;
}

.profile-placeholder i {
  font-size: 3.5rem;
  color: var(--accent);
}

/* About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.about-card, .facts-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}

.facts-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.fact-item {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.fact-item:last-child {
  border-bottom: none;
}

.fact-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.fact-value {
  font-weight: 600;
  color: var(--text-primary);
}

/* Skills Section */
.skills-grid {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.skill-category {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.category-header i {
  color: var(--accent);
  font-size: 1.25rem;
}

.badges-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.badge {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.badge:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* Projects Section */
.filter-container {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.filter-btn {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
  background-color: var(--accent);
  color: #0f172a;
  border-color: var(--accent);
}

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

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.project-img-wrapper {
  position: relative;
  height: 180px;
  background-color: var(--bg-tertiary);
  overflow: hidden;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-img {
  transform: scale(1.05);
}

.project-status {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-color);
  color: var(--accent);
  padding: 0.25rem 0.6rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  backdrop-filter: blur(4px);
}

.project-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.925rem;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.tech-tag {
  font-size: 0.75rem;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.project-actions {
  display: flex;
  gap: 0.75rem;
}

/* Services Section */
.services-grid {
  grid-template-columns: 1fr;
}

@media (min-width: 576px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.service-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-glow);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.service-title {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

/* Timeline Components (Education & Journey) */
.timeline-grid {
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

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

.timeline {
  position: relative;
  padding-left: 1.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

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

.timeline-dot {
  position: absolute;
  left: calc(-1.5rem - 5px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-date {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.timeline-content {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
}

/* Value Props / Why Work With Me */
.props-grid {
  grid-template-columns: 1fr;
}

@media (min-width: 576px) {
  .props-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .props-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.prop-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.prop-card:hover {
  border-color: var(--accent);
}

.prop-icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

/* Contact Section */
.contact-grid {
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.2fr;
  }
}

.contact-info-card, .contact-form-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-detail-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.copy-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  transition: var(--transition);
}

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

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-links h4 {
  margin-bottom: 1rem;
  font-size: 1rem;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Scroll To Top Button */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: var(--accent);
  color: #0f172a;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 900;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-3px);
}

/* Mobile Nav Overlay */
@media (max-width: 767px) {
  .mobile-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 2rem 1rem;
    gap: 1.25rem;
    transform: translateY(-150%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
  }
  
  .nav-menu.active {
    transform: translateY(0);
  }
}

/* Animations & Motion Accessibility */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .fade-in-up {
    opacity: 1;
    transform: none;
  }
}