/* ===========================
   DESIGN TOKENS & THEME
=========================== */

:root {
    /* Colors */
    --bg-primary: #0a0e27;
    --bg-secondary: #131729;
    --bg-tertiary: #1a1f3a;
    --bg-hover: #232d4d;
  
    --text-primary: #f5f7fa;
    --text-secondary: #c5cae9;
    --text-tertiary: #8b92b3;
  
    --accent-primary: #6366f1;
    --accent-primary-light: #818cf8;
    --accent-secondary: #ec4899;
    --accent-tertiary: #14b8a6;
  
    --border-color: #1e293b;
    --border-light: #2d3748;
  
    /* Spacing */
    --spacing-unit: 0.25rem;
  
    /* Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
  
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 20px 40px rgba(6, 13, 56, 0.4);
    --shadow-xl: 0 25px 60px rgba(6, 13, 56, 0.5);
  
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  /* ===========================
     RESET & BASE
  =========================== */
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    scroll-behavior: smooth;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #0f1530 100%);
    color: var(--text-primary);
    line-height: 1.65;
    font-weight: 400;
  }
  
  /* Custom scrollbar */
  ::-webkit-scrollbar {
    width: 10px;
  }
  
  ::-webkit-scrollbar-track {
    background: var(--bg-primary);
  }
  
  ::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 5px;
  }
  
  ::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--accent-primary-light), var(--accent-secondary));
  }
  
  /* ===========================
     NAVBAR (STICKY)
  =========================== */
  
  .navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: transparent;
    transition: all var(--transition-base);
  }
  
  .navbar.scrolled {
    background: rgba(10, 14, 39, 0.85);
    backdrop-filter: blur(20px) saturate(150%);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .nav-logo {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  
  .nav-menu {
    display: flex;
    gap: 2.5rem;
    font-size: 0.9rem;
    font-weight: 500;
  }
  
  .nav-link {
    position: relative;
    text-decoration: none;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    padding: 0.5rem 0;
  }
  
  .nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transition: width var(--transition-base);
  }
  
  .nav-link:hover {
    color: var(--text-primary);
  }
  
  .nav-link.active {
    color: var(--accent-primary);
  }
  
  .nav-link.active::after {
    width: 100%;
  }
  
  /* ===========================
     PAGE CONTAINER
  =========================== */
  
  .page-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 4rem 1.5rem 3rem;
  }
  
  section {
    scroll-margin-top: 5rem;
  }
  
  /* ===========================
     HERO SECTION
  =========================== */
  
  .hero-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    margin-bottom: 6rem;
    align-items: center;
  }
  
  .hero-left {
    max-width: 720px;
    animation: fadeInUp 0.8s ease-out;
  }
  
  .hero-title {
    font-size: clamp(2.5rem, 5vw + 0.5rem, 4rem);
    line-height: 1.15;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-tertiary);
    margin-bottom: 1.5rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }
  
  .hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 520px;
    line-height: 1.8;
  }
  
  .hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 3rem;
  }
  
  .btn-primary,
  .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
  }
  
  .btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-primary-light));
    color: #ffffff;
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
  }
  
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.6);
  }
  
  .btn-primary:active {
    transform: translateY(-1px);
  }
  
  .btn-secondary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    backdrop-filter: blur(10px);
  }
  
  .btn-secondary:hover {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--accent-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
  }
  
  .hero-links {
    display: flex;
    gap: 2rem;
    font-size: 0.9rem;
    color: var(--text-tertiary);
  }
  
  .hero-links a {
    color: var(--text-secondary);
    text-decoration: none;
    position: relative;
    transition: color var(--transition-fast);
  }
  
  .hero-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 1.5px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary));
    transition: width var(--transition-base);
  }
  
  .hero-links a:hover {
    color: var(--accent-primary);
  }
  
  .hero-links a:hover::after {
    width: 100%;
  }
  
  /* Hero image card */
  .hero-right {
    position: relative;
    height: 20rem;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.05));
    border: 1px solid var(--border-light);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeInScale 0.8s ease-out 0.2s backwards;
  }
  
  .hero-right::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.2), transparent 50%),
      radial-gradient(circle at 70% 70%, rgba(236, 72, 153, 0.1), transparent 50%);
    pointer-events: none;
  }
  
  .profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s ease-out;
  }
  
  .hero-right:hover .profile-image {
    transform: scale(1.05);
  }
  
  @media (min-width: 768px) {
    .hero-section {
      grid-template-columns: 1.2fr 1fr;
      gap: 3rem;
    }
    .hero-right {
      height: 24rem;
    }
  }
  
  /* ===========================
     SECTION HEADINGS
  =========================== */
  
  .section-heading {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
  }
  
  /* ===========================
     EXPERIENCE SECTION
  =========================== */
  
  .exp-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
  }
  
  @media (min-width: 1024px) {
    .exp-grid {
      grid-template-columns: 1.8fr 1.1fr;
      gap: 2.5rem;
    }
  }
  
  .exp-item {
    position: relative;
    padding-left: 2rem;
    padding-bottom: 2.5rem;
    margin-bottom: 1.5rem;
    border-left: 2px solid var(--border-light);
    transition: all var(--transition-base);
    animation: slideInLeft 0.6s ease-out backwards;
  }
  
  .exp-item:nth-child(1) {
    animation-delay: 0.1s;
  }
  .exp-item:nth-child(2) {
    animation-delay: 0.2s;
  }
  .exp-item:nth-child(3) {
    animation-delay: 0.3s;
  }
  
  .exp-item.border-blue {
    border-left-color: var(--accent-primary);
  }
  
  .exp-item::before {
    content: "";
    position: absolute;
    left: -0.65rem;
    top: 0;
    width: 1.3rem;
    height: 1.3rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: 3px solid var(--bg-primary);
    transition: all var(--transition-base);
  }
  
  .exp-item:hover::before {
    transform: scale(1.3);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
  }
  
  .exp-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  .exp-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
  }
  
  .exp-date {
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 600;
    white-space: nowrap;
  }
  
  .exp-company {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 0.75rem;
  }
  
  .exp-list {
    list-style: none;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
  }
  
  .exp-list li {
    margin-bottom: 0.6rem;
    padding-left: 0.5rem;
  }
  
  .exp-list li::before {
    content: "→";
    margin-right: 0.5rem;
    color: var(--accent-primary);
    font-weight: 700;
  }
  
  /* Right column */
  .exp-right {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }
  
  .right-label {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    font-weight: 700;
    margin-bottom: 1rem;
  }
  
  .metric-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(20, 184, 166, 0.05));
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    animation: slideInRight 0.6s ease-out backwards;
  }
  
  .metric-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15), transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-base);
  }
  
  .metric-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.3);
  }
  
  .metric-card:hover::before {
    opacity: 1;
  }
  
  .metric-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  
  .metric-label {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: 0.5rem;
    font-weight: 500;
  }
  
  .mt-40 {
    margin-top: 1.5rem;
  }
  
  .edu-card {
    background: rgba(99, 102, 241, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    padding: 1rem 1.25rem;
    transition: all var(--transition-base);
  }
  
  .edu-card:hover {
    border-color: var(--accent-tertiary);
    background: rgba(20, 184, 166, 0.1);
    transform: translateX(4px);
  }
  
  .edu-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
  }
  
  .edu-sub {
    font-size: 0.85rem;
    color: var(--text-tertiary);
  }
  
  /* ===========================
     SKILLS GRID
  =========================== */
  
  .skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 4rem;
  }
  
  @media (max-width: 480px) {
    .skills-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 0.75rem;
    }
  }
  
  .skill-card {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(20, 184, 166, 0.04));
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    padding: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: default;
    transition: all var(--transition-base);
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  
  .skill-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(236, 72, 153, 0.1));
    opacity: 0;
    transition: opacity var(--transition-base);
  }
  
  .skill-card:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
  }
  
  .skill-card:hover::before {
    opacity: 1;
  }
  
  .skill-card > * {
    position: relative;
    z-index: 1;
  }
  
  /* ===========================
     FOOTER
  =========================== */
  
  .footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 1.5rem 2rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-tertiary);
  }
  
  /* ===========================
     ANIMATIONS
  =========================== */
  
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  @keyframes fadeInScale {
    from {
      opacity: 0;
      transform: scale(0.95);
    }
    to {
      opacity: 1;
      transform: scale(1);
    }
  }
  
  @keyframes slideInLeft {
    from {
      opacity: 0;
      transform: translateX(-30px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }
  
  @keyframes slideInRight {
    from {
      opacity: 0;
      transform: translateX(30px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }
  
  /* ===========================
     RESPONSIVE
  =========================== */
  
  @media (max-width: 768px) {
    .page-container {
      padding: 3rem 1rem 2rem;
    }
  
    .nav-inner {
      padding: 1rem;
    }
  
    .nav-menu {
      gap: 1.5rem;
      font-size: 0.85rem;
    }
  
    .hero-buttons {
      flex-direction: column;
    }
  
    .btn-primary,
    .btn-secondary {
      width: 100%;
    }
  
    .hero-links {
      flex-direction: column;
      gap: 1rem;
    }
  
    .exp-grid {
      grid-template-columns: 1fr;
    }
  
    .hero-section {
      gap: 2.5rem;
    }
  }