/* ==========================================
   CSS Custom Properties
   ========================================== */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1e2a47;
  --text-primary: #e8e8e8;
  --text-secondary: #a0a0b8;
  --accent: #0ea5e9;
  --accent-hover: #38bdf8;
  --accent-glow: rgba(14, 165, 233, 0.15);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(14, 165, 233, 0.3);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --navbar-height: 72px;
  --max-width: 1200px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-height);
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul {
  list-style: none;
}

h1, h2, h3, h4 {
  color: var(--text-primary);
  line-height: 1.3;
  font-weight: 600;
}

/* ==========================================
   Utility / Shared
   ========================================== */
.section {
  padding: 80px 24px;
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__heading {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 48px;
  position: relative;
}

.section__heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  gap: 8px;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn--primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(14, 165, 233, 0.35);
}

.btn--outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn--outline:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

.btn--full {
  width: 100%;
}

.btn__loading {
  display: none;
}

.btn--loading .btn__text {
  display: none;
}

.btn--loading .btn__loading {
  display: inline;
}

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* ==========================================
   Navbar
   ========================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar--scrolled {
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.navbar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: var(--navbar-height);
}

.navbar__logo {
  text-decoration: none;
  flex-shrink: 0;
}

.navbar__monogram {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  font-weight: 700;
  font-size: 1.1rem;
  transition: all var(--transition);
}

.navbar__logo:hover .navbar__monogram {
  background: var(--accent);
  color: #fff;
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar__link {
  color: var(--text-secondary);
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.navbar__link:hover,
.navbar__link--active {
  color: var(--text-primary);
}

.navbar__link--active {
  color: var(--accent);
}

.navbar__link--cta {
  background: var(--accent);
  color: #fff;
  margin-left: 8px;
}

.navbar__link--cta:hover {
  background: var(--accent-hover);
  color: #fff;
}

/* Hamburger */
.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1001;
}

.navbar__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.navbar__toggle--open .navbar__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle--open .navbar__toggle-bar:nth-child(2) {
  opacity: 0;
}

.navbar__toggle--open .navbar__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================
   Hero
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--navbar-height) + 40px) 24px 80px;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.hero__greeting {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.hero__name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.hero__title {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 20px;
}

.hero__tagline {
  font-size: 1.05rem;
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero__social {
  display: flex;
  gap: 16px;
  align-items: center;
}

.hero__social a {
  color: var(--text-secondary);
  transition: color var(--transition), transform var(--transition);
}

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

.hero__image {
  display: flex;
  justify-content: center;
}

.hero__headshot {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 3px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero__headshot::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), transparent 60%);
  z-index: -1;
}

.hero__headshot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.hero__headshot-placeholder {
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.3;
}

/* ==========================================
   About
   ========================================== */
.about {
  background: var(--bg-secondary);
}

.about__grid {
  max-width: 900px;
  margin: 0 auto;
}

.about__bio {
  text-align: center;
}

.about__bio p {
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.about__bio p:last-child {
  margin-bottom: 0;
}

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about__stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

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

.about__stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.about__stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ==========================================
   Skills
   ========================================== */
.skills__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.skills__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.skills__card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.skills__icon {
  color: var(--accent);
  margin-bottom: 16px;
}

.skills__title {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.skills__desc {
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ==========================================
   Experience / Timeline
   ========================================== */
.experience {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 32px;
}

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

.timeline__item {
  position: relative;
  margin-bottom: 40px;
}

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

.timeline__item::before {
  content: '';
  position: absolute;
  left: -37px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--bg-secondary);
  z-index: 1;
}

.timeline__content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition);
}

.timeline__content:hover {
  border-color: var(--border-hover);
}

.timeline__date {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 8px;
}

.timeline__title {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.timeline__company {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 4px;
}

.timeline__location {
  font-size: 0.85rem;
  color: var(--text-secondary);
  opacity: 0.7;
  margin-bottom: 12px;
}

.timeline__desc {
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ==========================================
   Projects
   ========================================== */
.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.projects__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.projects__card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.projects__card-header {
  color: var(--accent);
  margin-bottom: 16px;
}

.projects__title {
  font-size: 1.15rem;
  margin-bottom: 12px;
}

.projects__desc {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.projects__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.projects__tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.8rem;
  background: var(--accent-glow);
  color: var(--accent);
  border-radius: 20px;
  font-weight: 500;
}

/* ==========================================
   Blog
   ========================================== */
.blog {
  background: var(--bg-secondary);
}

.blog__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.blog__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.blog__card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.blog__card-image {
  height: 180px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  display: flex;
  align-items: center;
  justify-content: center;
}

.blog__card-placeholder {
  font-size: 1.2rem;
  color: var(--text-secondary);
  opacity: 0.4;
  font-weight: 500;
}

.blog__card-body {
  padding: 24px;
}

.blog__date {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
}

.blog__title {
  font-size: 1.1rem;
  margin: 8px 0 12px;
  line-height: 1.4;
}

.blog__excerpt {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.blog__read-more {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
}

.blog__read-more:hover {
  color: var(--accent-hover);
}

/* ==========================================
   Contact
   ========================================== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.contact__intro {
  font-size: 1.05rem;
  margin-bottom: 32px;
  line-height: 1.8;
}

.contact__detail {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.contact__detail svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact__detail-label {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.contact__detail p {
  font-size: 0.9rem;
}

.contact__detail a {
  color: var(--text-secondary);
}

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

/* Form */
.form__group {
  margin-bottom: 20px;
}

.form__label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.form__input {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-family);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form__input::placeholder {
  color: var(--text-secondary);
  opacity: 0.5;
}

.form__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form__input--error {
  border-color: #ef4444;
}

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

.form__error {
  display: block;
  font-size: 0.8rem;
  color: #ef4444;
  margin-top: 4px;
  min-height: 1.2em;
}

.form__status {
  text-align: center;
  margin-top: 12px;
  font-size: 0.9rem;
  min-height: 1.4em;
}

.form__status--success {
  color: #22c55e;
}

.form__status--error {
  color: #ef4444;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 24px 24px;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.footer__tagline {
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 300px;
}

.footer__heading {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

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

.footer__social-links {
  display: flex;
  gap: 16px;
}

.footer__social-links a {
  color: var(--text-secondary);
  transition: color var(--transition), transform var(--transition);
}

.footer__social-links a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.footer__bottom {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

/* ==========================================
   Back to Top
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition);
  box-shadow: var(--shadow);
  z-index: 900;
}

.back-to-top--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

/* ==========================================
   Responsive: Tablet (768px+)
   ========================================== */
@media (min-width: 768px) {
  .section {
    padding: 100px 40px;
  }

  .section__heading {
    font-size: 2.2rem;
  }

  .hero__inner {
    grid-template-columns: 1.2fr 1fr;
  }

  .hero__image {
    order: 0;
  }

  .hero__headshot {
    width: 320px;
    height: 320px;
  }


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

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

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

  .contact__grid {
    grid-template-columns: 1fr 1.2fr;
  }

  .footer__inner {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

/* ==========================================
   Responsive: Desktop (1024px+)
   ========================================== */
@media (min-width: 1024px) {
  .section {
    padding: 120px 40px;
  }

  .section__heading {
    font-size: 2.4rem;
    margin-bottom: 56px;
  }

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

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

  .hero__headshot {
    width: 360px;
    height: 360px;
  }

  /* Desktop timeline: alternating */
  .timeline {
    padding-left: 0;
  }

  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline__item {
    width: 50%;
    margin-bottom: 48px;
  }

  .timeline__item::before {
    left: auto;
    top: 24px;
  }

  .timeline__item--left {
    padding-right: 48px;
    text-align: right;
  }

  .timeline__item--left::before {
    right: -6px;
  }

  .timeline__item--right {
    margin-left: 50%;
    padding-left: 48px;
  }

  .timeline__item--right::before {
    left: -6px;
  }
}

/* ==========================================
   Responsive: Mobile (<768px)
   ========================================== */
@media (max-width: 767px) {
  .navbar__toggle {
    display: flex;
  }

  .navbar__menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    align-items: stretch;
    padding: calc(var(--navbar-height) + 16px) 24px 24px;
    gap: 0;
    transform: translateX(100%);
    transition: transform var(--transition);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.4);
  }

  .navbar__menu--open {
    transform: translateX(0);
  }

  .navbar__link {
    padding: 12px 16px;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .navbar__link--cta {
    margin-left: 0;
    margin-top: 16px;
    text-align: center;
    border-bottom: none;
  }

  .hero {
    text-align: center;
  }

  .hero__tagline {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__social {
    justify-content: center;
  }

  .hero__image {
    order: -1;
  }

  .hero__headshot {
    width: 200px;
    height: 200px;
  }

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

/* ==========================================
   Focus States (Accessibility)
   ========================================== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.navbar__link:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Nav overlay for mobile */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.nav-overlay--visible {
  opacity: 1;
  visibility: visible;
}