/* ============================================
   DESIGN SYSTEM — Tao Portfolio
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --color-bg: #f7f8fa;
  --color-bg-light: #eef0f4;
  --color-bg-card: rgba(255, 255, 255, 0.85);
  --color-accent: #0d9488;
  --color-accent-dim: rgba(13, 148, 136, 0.1);
  --color-text: #374151;
  --color-text-dim: #6b7280;
  --color-text-bright: #111827;
  --color-white: #ffffff;
  --color-border: rgba(13, 148, 136, 0.18);

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 4px 24px -4px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(13, 148, 136, 0.15);
  --shadow-strong: 0 12px 40px -8px rgba(0, 0, 0, 0.14);

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-med: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --max-width: 1100px;
}

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

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

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

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

a:hover {
  color: var(--color-text-bright);
}

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

ul {
  list-style: none;
}

::selection {
  background: rgba(100, 255, 218, 0.25);
  color: var(--color-text-bright);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-dim);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 2rem;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(247, 248, 250, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--transition-med);
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

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

.nav__links a:hover::after {
  width: 100%;
}

.nav__links .nav-number {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-right: 4px;
}

.nav__resume-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.nav__resume-btn:hover {
  background: var(--color-accent-dim);
  color: var(--color-accent) !important;
}

.nav__resume-btn::after {
  display: none !important;
}

/* Mobile hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.nav__hamburger span {
  width: 28px;
  height: 2px;
  background: var(--color-accent);
  transition: all var(--transition-fast);
  border-radius: 2px;
}

/* ---------- Sections (shared) ---------- */
section {
  padding: 100px 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-text-bright);
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.section-heading .heading-number {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--color-accent);
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #e5e7eb;
  max-width: 300px;
}

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(13, 148, 136, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4rem;
  width: 100%;
}

.hero__content {
  max-width: 600px;
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-accent);
  margin-bottom: 1.2rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 0.2s;
}

.hero__name {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  color: var(--color-text-bright);
  line-height: 1.05;
  margin-bottom: 0.3rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 0.35s;
}

.hero__tagline {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4vw, 3rem);
  font-weight: 600;
  color: var(--color-text-dim);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 0.5s;
}

.hero__typing {
  display: inline;
}

.hero__cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--color-accent);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}

.hero__description {
  font-size: 1.05rem;
  color: var(--color-text-dim);
  max-width: 500px;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 0.65s;
}

.hero__cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 0.8s;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--color-accent);
  text-decoration: none;
}

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

.btn--primary:hover {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn--secondary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.btn--secondary:hover {
  background: rgba(100, 255, 218, 0.85);
  color: var(--color-bg);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Hero photo */
.hero__photo-wrapper {
  position: relative;
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: 0.5s;
}

.hero__photo-frame {
  position: relative;
  width: 280px;
  height: 280px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.hero__photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: relative;
  z-index: 1;
  filter: brightness(1.03) contrast(1.08) saturate(1.15);
  transition: filter var(--transition-med);
}

.hero__photo-frame:hover img {
  filter: brightness(1.03) contrast(1.08) saturate(1.15);
}

/* Blurred bokeh backdrop — fills horizontal space around portrait */
.hero__photo-frame::before {
  content: '';
  position: absolute;
  inset: -30px;
  background: url('image2.png') center / cover no-repeat;
  filter: blur(20px) brightness(0.72) saturate(1.15);
  transform: scale(1.12);
  /* prevents blur edge ghosting */
  z-index: 0;
  border-radius: 0;
}

.hero__photo-frame:hover::before {
  filter: blur(20px) brightness(0.78) saturate(1.15);
}

.hero__photo-border {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 280px;
  height: 280px;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  z-index: -1;
  transition: all var(--transition-med);
}

.hero__photo-wrapper:hover .hero__photo-border {
  top: 10px;
  left: 10px;
}

/* ---------- ABOUT ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about__text p {
  margin-bottom: 1rem;
  color: var(--color-text-dim);
  font-size: 0.95rem;
}

.about__details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.about__detail-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.4rem;
  backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
}

.about__detail-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.about__detail-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}

.about__detail-value {
  font-size: 0.95rem;
  color: var(--color-text-bright);
  font-weight: 500;
}

/* ---------- SKILLS ---------- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.8rem;
  backdrop-filter: blur(10px);
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-med);
}

.skill-card:hover {
  border-color: rgba(100, 255, 218, 0.3);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

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

.skill-card__icon {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--color-accent);
}

.skill-card__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-bright);
  margin-bottom: 1rem;
}

.skill-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text);
  background: rgba(100, 255, 218, 0.06);
  border: 1px solid rgba(100, 255, 218, 0.1);
  padding: 0.3rem 0.7rem;
  border-radius: 50px;
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- EXPERIENCE TIMELINE ---------- */
.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-bg-light));
}

.timeline__item {
  position: relative;
  margin-bottom: 3rem;
  padding-left: 2rem;
}

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

.timeline__dot {
  position: absolute;
  left: -2.6rem;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  background: var(--color-bg);
  transition: all var(--transition-fast);
  z-index: 1;
}

.timeline__item:hover .timeline__dot {
  background: var(--color-accent);
  box-shadow: 0 0 12px rgba(100, 255, 218, 0.4);
}

.timeline__header {
  margin-bottom: 0.6rem;
}

.timeline__role {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-bright);
}

.timeline__company {
  color: var(--color-accent);
  font-weight: 500;
}

.timeline__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  margin-bottom: 0.8rem;
}

.timeline__description {
  color: var(--color-text-dim);
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
  max-width: 600px;
}

.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.timeline__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-accent);
  background: var(--color-accent-dim);
  padding: 0.2rem 0.6rem;
  border-radius: 50px;
}

/* ---------- TECH TAGS ---------- */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- CONTACT ---------- */
.contact {
  text-align: center;
}

.contact__inner {
  max-width: 600px;
  margin: 0 auto;
}

.contact__overline {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  margin-bottom: 0.8rem;
}

.contact__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--color-text-bright);
  margin-bottom: 1.2rem;
}

.contact__text {
  color: var(--color-text-dim);
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

.contact__btn {
  margin-bottom: 3rem;
}

.contact__socials {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-dim);
  transition: all var(--transition-fast);
}

.contact__social-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.contact__social-link svg {
  width: 22px;
  height: 22px;
}

/* ---------- FOOTER ---------- */
.footer {
  padding: 2rem 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer__text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  line-height: 1.8;
}

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

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* ---------- Keyframes ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(25px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__content {
    max-width: 100%;
  }

  .hero__description {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero__cta {
    justify-content: center;
  }

  .hero__photo-wrapper {
    margin: 0 auto;
    order: -1;
    margin-bottom: 2rem;
  }

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

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__links.active {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    right: 0;
    width: 75%;
    max-width: 320px;
    height: 100vh;
    background: var(--color-bg-light);
    padding: 6rem 2rem 2rem;
    gap: 1.5rem;
    box-shadow: var(--shadow-strong);
    z-index: 999;
    animation: slideIn 0.3s ease;
  }

  @keyframes slideIn {
    from {
      transform: translateX(100%);
    }

    to {
      transform: translateX(0);
    }
  }

  .hero__photo-frame,
  .hero__photo-border {
    width: 220px;
    height: 220px;
  }

  section {
    padding: 70px 0;
  }

  .section-heading {
    font-size: 1.4rem;
  }

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

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

  .hero__name {
    font-size: 2.2rem;
  }

  .hero__tagline {
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1.2rem;
  }

  .nav {
    padding: 0 1.2rem;
  }

  .hero__photo-frame,
  .hero__photo-border {
    width: 180px;
    height: 180px;
  }

  .btn {
    padding: 0.7rem 1.4rem;
    font-size: 0.8rem;
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline__item {
    padding-left: 1rem;
  }

  .timeline__dot {
    left: -1.6rem;
  }
}