/* ============================================================================
 *  MODERN DARK THEME PORTFOLIO - PROFESSIONAL DESIGN
 * =========================================================================== */

:root {
  --bg-primary: #0a1420;
  --bg-secondary: #0f1929;
  --bg-tertiary: #162a3a;
  --text-primary: #ecf0f1;
  --text-secondary: #b0c4de;
  --text-tertiary: #7a8fa3;
  --accent: #00d9ff;
  --accent-dark: #0096b3;
  --accent-light: #1ff9ff;
  --accent-secondary: #0fa8cc;
  --accent-green: #1dd1a1;
  --accent-purple: #a29bfe;
  --border: #1e3a52;
  --shadow: 0 0 0 1px rgba(30, 58, 82, 0.8);
  --shadow-md: 0 3px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.6);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  background-attachment: fixed;
  line-height: 1.6;
  font-size: 16px;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================================================
 *  NAVBAR
 * =========================================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  box-shadow: 0 0 0 1px var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
}

.nav-brand:hover {
  transform: scale(1.05);
}

.logo-icon {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 0 8px rgba(0, 217, 255, 0.4));
  transition: var(--transition);
}

.nav-brand:hover .logo-icon {
  filter: drop-shadow(0 0 12px rgba(0, 217, 255, 0.6)) drop-shadow(0 0 20px rgba(31, 249, 255, 0.3));
  transform: rotate(10deg);
}

.brand-text {
  font-weight: 700;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.3px;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transition: width 0.3s ease;
  box-shadow: 0 0 12px rgba(0, 217, 255, 0.4);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  box-shadow: 0 0 8px rgba(0, 217, 255, 0.3);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================================================
 *  MAIN CONTENT
 * =========================================================================== */

.main-content {
  flex: 1;
  margin-top: 80px;
}

/* ============================================================================
 *  HERO SECTION
 * =========================================================================== */

.hero {
  padding: 5rem 2rem;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(0, 217, 255, 0.05) 100%);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(0, 217, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 2rem;
  border: 3px solid var(--accent);
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.3), inset 0 0 30px rgba(0, 217, 255, 0.1);
  transition: var(--transition);
}

.hero-avatar:hover {
  transform: scale(1.05);
  box-shadow: 0 0 40px rgba(0, 217, 255, 0.5), inset 0 0 30px rgba(0, 217, 255, 0.15);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.1;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--accent-light);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.cta-btn {
  padding: 1rem 2.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
  border: 2px solid;
  position: relative;
  overflow: hidden;
}

.cta-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.cta-btn:hover::before {
  opacity: 1;
}

.cta-btn.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--bg-primary);
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.3);
}

.cta-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.5);
  border-color: var(--accent-light);
}

.cta-btn.secondary {
  background: transparent;
  color: var(--accent-light);
  border-color: var(--accent);
}

.cta-btn.secondary:hover {
  background: rgba(0, 217, 255, 0.1);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
}

.hero-socials {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--accent);
  text-decoration: none;
  font-size: 1.3rem;
  transition: var(--transition);
  border: 2px solid var(--border);
}

.social-link:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent-light);
  transform: translateY(-4px) rotate(5deg);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.4);
}

/* ============================================================================
 *  SECTIONS
 * =========================================================================== */

.section {
  padding: 5rem 2rem;
  border-bottom: 1px solid var(--border);
}

.section:nth-child(odd) {
  background: var(--bg-secondary);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 3rem;
  text-align: center;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 50%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* ============================================================================
 *  ABOUT SECTION
 * =========================================================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.about-description {
  font-size: 1.1rem !important;
  color: var(--text-primary) !important;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.stat {
  text-align: center;
  padding: 2rem;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(211, 157, 255, 0.05) 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: var(--transition);
}

.stat:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ============================================================================
 *  EXPERIENCE SECTION
 * =========================================================================== */

.experience-list {
  max-width: 800px;
  margin: 0 auto;
}

.experience-item {
  padding: 2rem;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.experience-item::before {
  content: '';
  position: absolute;
  top: 0;
  right: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 217, 255, 0.1), transparent);
  transition: right 0.5s ease;
}

.experience-item:hover::before {
  right: 100%;
}

.experience-item:hover {
  box-shadow: var(--shadow-lg);
  border-left-color: var(--accent-light);
  transform: translateX(8px);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 1rem;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

.company-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.position {
  font-size: 1rem;
  color: var(--accent-light);
  font-weight: 600;
  margin-top: 0.25rem;
}

.duration {
  color: var(--text-tertiary);
  font-weight: 500;
  white-space: nowrap;
  font-size: 0.9rem;
}

.experience-desc {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

.responsibilities {
  list-style: none;
  padding-left: 0;
  position: relative;
  z-index: 1;
}

.responsibilities li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  color: var(--text-secondary);
  position: relative;
  line-height: 1.6;
}

.responsibilities li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-green);
  font-weight: 700;
  font-size: 1.2rem;
}

.location-badge {
  display: inline-block;
  background: rgba(0, 217, 255, 0.15);
  color: var(--accent-light);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 1rem;
  border: 1px solid var(--accent);
  position: relative;
  z-index: 1;
}

/* ============================================================================
 *  SKILLS SECTION
 * =========================================================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.skill-card {
  padding: 2rem;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent-purple));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.skill-card:hover::before {
  transform: scaleX(1);
}

.skill-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
  transform: translateY(-8px);
}

.skill-category {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-category::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 24px;
  background: linear-gradient(180deg, var(--accent), var(--accent-light));
  border-radius: 2px;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.skill-tag {
  background: rgba(0, 217, 255, 0.1);
  color: var(--accent-light);
  padding: 0.6rem 1.2rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  border: 1px solid var(--accent);
  cursor: default;
}

.skill-tag:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(0, 217, 255, 0.3);
}

/* ============================================================================
 *  PROJECTS SECTION
 * =========================================================================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2.5rem;
}

.project-card {
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  position: relative;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent), var(--accent-purple));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover::before {
  opacity: 1;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.25);
  transform: translateY(-12px);
}

.project-header {
  padding: 2rem;
  background: linear-gradient(135deg, rgba(0, 217, 255, 0.1) 0%, rgba(211, 157, 255, 0.05) 100%);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
}

.project-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-light);
}

.project-year {
  color: var(--text-tertiary);
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

.project-body {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-desc {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.tech-tag {
  background: rgba(0, 217, 255, 0.15);
  color: var(--accent);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid rgba(0, 217, 255, 0.3);
  transition: var(--transition);
}

.tech-tag:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent-light);
}

.project-link {
  color: var(--accent-light);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  display: inline-block;
  align-self: flex-start;
}

.project-link:hover {
  color: var(--accent-orange);
  text-decoration: underline;
  transform: translateX(4px);
}

/* ============================================================================
 *  EDUCATION SECTION
 * =========================================================================== */

.education-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.education-item {
  padding: 2rem;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-green);
  border-radius: 8px;
  transition: var(--transition);
}

.education-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-left-color: var(--accent-light);
}

.institution {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.degree {
  color: var(--accent-light);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.field {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.edu-year {
  color: var(--text-tertiary);
  font-weight: 500;
  font-size: 0.9rem;
}

.certifications-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.cert-item {
  padding: 2rem;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent-orange);
  border-radius: 8px;
  transition: var(--transition);
}

.cert-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-top-color: var(--accent-light);
}

.cert-name {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.cert-issuer {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.cert-year {
  color: var(--accent-light);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ============================================================================
 *  CONTACT SECTION
 * =========================================================================== */

.contact-form {
  max-width: 700px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  transition: var(--transition);
  background: var(--bg-tertiary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-secondary);
  box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.2);
}

.form-status {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  display: none;
  font-weight: 600;
  border: 1px solid;
}

.form-status.success {
  display: block;
  background: rgba(63, 185, 80, 0.15);
  color: var(--accent-green);
  border-color: var(--accent-green);
}

.form-status.error {
  display: block;
  background: rgba(248, 81, 73, 0.15);
  color: #f85149;
  border-color: #f85149;
}

/* ============================================================================
 *  FOOTER
 * =========================================================================== */

.footer {
  background: var(--bg-primary);
  color: var(--text-secondary);
  padding: 3rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-content p {
  margin: 0.5rem 0;
}

.footer-subtitle {
  font-size: 0.9rem;
  opacity: 0.9;
  color: var(--accent);
}

/* ============================================================================
 *  RESPONSIVE DESIGN
 * =========================================================================== */

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

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0.5rem;
    background: var(--bg-secondary);
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-menu.active {
    max-height: 400px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .hero-cta {
    flex-direction: column;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
  }

  .cta-btn {
    width: 100%;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .skills-grid,
  .projects-grid,
  .education-list,
  .certifications-list {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3rem 1.5rem;
  }

  .hero {
    padding: 3rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .main-content {
    margin-top: 70px;
  }

  .navbar {
    padding: 0.75rem 0;
  }

  .nav-container {
    padding: 0 1rem;
  }

  .nav-brand {
    font-size: 1.3rem;
  }

  .nav-menu {
    padding: 0.75rem 1rem;
  }

  .hero-avatar {
    width: 120px;
    height: 120px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 1rem;
  }

  .hero-socials {
    gap: 0.75rem;
  }

  .social-link {
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }
}