/* ============================
   DESIGN TOKENS
   ============================ */

:root {
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.45);
  --shadow-card: 0 10px 30px rgba(15, 23, 42, 0.30);

  --transition-fast: 150ms ease-out;
  --transition-med: 220ms ease-out;

  --font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* DARK THEME (default) */
body.dark-theme {
  --bg-page: #020617;
  --bg-nav: rgba(15, 23, 42, 0.95);
  --bg-elevated: #020617;
  --bg-elevated-soft: #020617;
  --bg-soft: #020617;
  --bg-input: #020617;

  --border-subtle: rgba(148, 163, 184, 0.25);

  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --accent-soft: rgba(56, 189, 248, 0.12);

  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --text-soft: #6b7280;

  --chip-bg: rgba(15, 23, 42, 0.9);
  --pill-bg: rgba(15, 23, 42, 0.9);

  --footer-bg: radial-gradient(circle at top, rgba(37, 99, 235, 0.16), transparent 60%),
    #020617;
}

/* LIGHT THEME */
body.light-theme {
  --bg-page: #f3f4f6;
  --bg-nav: rgba(255, 255, 255, 0.98);
  --bg-elevated: #ffffff;
  --bg-elevated-soft: #f9fafb;
  --bg-soft: #e5e7eb;
  --bg-input: #ffffff;

  --border-subtle: rgba(148, 163, 184, 0.35);

  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: rgba(37, 99, 235, 0.08);

  --text-main: #111827;
  --text-muted: #4b5563;
  --text-soft: #6b7280;

  --chip-bg: #f3f4f6;
  --pill-bg: #edf2ff;

  --footer-bg: linear-gradient(to bottom, #f9fafb, #e5e7eb);
}

/* ============================
   GLOBAL BASE
   ============================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-main);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.top-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px);
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0.5rem 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle at 30% 0, #38bdf8, #4f46e5);
  color: #f9fafb;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 0 0 2px rgba(15, 23, 42, 0.6);
}

.logo-text {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  font-size: 0.85rem;
  font-weight: 500;
}

.nav-links a {
  position: relative;
  text-decoration: none;
  color: var(--text-soft);
  padding-bottom: 0.1rem;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
  border-radius: 999px;
  transition: width var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-main);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-button {
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated-soft);
  color: var(--text-soft);
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast), transform var(--transition-fast);
}

.icon-button:hover {
  color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
  transform: translateY(-1px);
}

.menu-button {
  display: none;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.4fr);
  gap: 2.5rem;
  padding: 3.2rem 1.5rem 2.6rem;
}

.hero-text h1 {
  font-size: clamp(2.6rem, 4.5vw, 3.2rem);
  margin: 0.35rem 0 0.75rem;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.hero-subtitle {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
  max-width: 34rem;
  line-height: 1.7;
  font-size: 1rem;
}

.eyebrow {
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
}

.accent {
  background: linear-gradient(90deg, var(--accent), #a855f7);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    filter var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #0b1120;
  box-shadow: var(--shadow-soft);
}

.btn.primary:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.btn.ghost {
  background: var(--bg-elevated-soft);
  border-color: var(--border-subtle);
  color: var(--text-muted);
}

.btn.ghost:hover {
  color: var(--accent);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.18);
}

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

.hero-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  max-width: 28rem;
}

.meta-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-soft);
}

.meta-value {
  font-size: 0.9rem;
  color: var(--text-main);
}

/* Hero Card */

.hero-card {
  background: radial-gradient(circle at 0 0, var(--accent-soft), transparent 55%),
    var(--bg-elevated);
  border-radius: 28px;
  border: 1px solid var(--border-subtle);
  padding: 1.4rem 1.4rem 1.3rem;
  box-shadow: var(--shadow-card);
}

.hero-card h2 {
  margin-top: 0.4rem;
  margin-bottom: 0.8rem;
  font-size: 1.1rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  background: rgba(22, 163, 74, 0.12);
  border: 1px solid rgba(22, 163, 74, 0.6);
  font-size: 0.78rem;
  color: #bbf7d0;
}

body.light-theme .status-pill {
  background: #dcfce7;
  color: #14532d;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #22c55e;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.3);
}

.hero-list {
  list-style: none;
  padding: 0;
  margin: 0.6rem 0 0;
}

.hero-list li {
  font-size: 0.9rem;
  color: var(--text-main);
  margin-bottom: 0.45rem;
}

/* ============================
   SECTIONS & CARDS
   ============================ */

.section {
  padding: 2rem 1.5rem 0.8rem;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1.4rem;
}

.section-header h2 {
  font-size: 1.55rem;
  margin: 0;
  letter-spacing: -0.02em;
}

.section-header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.card {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 1.2rem 1.25rem;
  box-shadow: var(--shadow-card);
}

/* Grids */

.grid {
  display: grid;
  gap: 1.4rem;
}

.grid.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Lists & Tags */

.bullet-list {
  padding-left: 1.1rem;
  margin: 0.3rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.bullet-list li+li {
  margin-top: 0.25rem;
}

.tag-list {
  list-style: none;
  padding: 0;
  margin: 0.4rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag-list li {
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--chip-bg);
  border: 1px solid var(--border-subtle);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Skills highlight */

.skills-highlight {
  margin-top: 1.7rem;
  padding: 1.25rem 1.25rem 1.05rem;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at 0 0, var(--accent-soft), transparent 55%),
    var(--bg-elevated-soft);
  border: 1px solid var(--accent-soft);
}

.skills-highlight h3 {
  margin-top: 0;
  margin-bottom: 0.7rem;
  font-size: 1.02rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.chips span {
  font-size: 0.78rem;
  padding: 0.28rem 0.7rem;
  border-radius: var(--radius-pill);
  background: var(--chip-bg);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

.chips.small span {
  font-size: 0.75rem;
}

/* ============================
   TIMELINE (EXPERIENCE)
   ============================ */

.timeline {
  position: relative;
  margin-top: 1.2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 6px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-soft), transparent);
}

.timeline-item {
  position: relative;
  padding-left: 2.6rem;
  margin-bottom: 1.3rem;
}

.timeline-marker {
  position: absolute;
  left: 4px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 2px solid var(--accent);
  background: var(--bg-page);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.timeline-content {
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 0.9rem 1.1rem 0.9rem;
}

.timeline-content h3 {
  margin: 0 0 0.15rem;
  font-size: 1.02rem;
}

.timeline-meta {
  margin: 0 0 0.45rem;
  font-size: 0.82rem;
  color: var(--text-soft);
}

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

.project-card {
  position: relative;
  overflow: hidden;
}

.project-card .pill {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  font-size: 0.72rem;
  color: var(--text-soft);
  background: var(--pill-bg);
}

.project-card h3 {
  margin: 0.65rem 0 0.4rem;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}

.project-card p {
  margin: 0 0 0.7rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.project-meta {
  margin: 0 0 0.7rem;
  padding-left: 1rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.text-link {
  font-size: 0.86rem;
  color: var(--accent-strong);
  text-decoration: none;
}

.text-link:hover {
  text-decoration: underline;
}

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

.contact-grid {
  align-items: flex-start;
}

.contact-card p {
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.contact-list li+li {
  margin-top: 0.3rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.field label {
  font-size: 0.8rem;
  color: var(--text-soft);
}

input,
textarea {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-input);
  color: var(--text-main);
  padding: 0.6rem 0.75rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    background-color var(--transition-fast), transform var(--transition-fast);
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
}

textarea {
  resize: vertical;
}

.contact-note {
  font-size: 0.75rem;
  color: var(--text-soft);
}

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

.site-footer {
  margin-top: 2.4rem;
  padding: 1.6rem 1.5rem 2.2rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--footer-bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-soft);
}

/* ============================
   UTILITIES
   ============================ */

.text-muted {
  color: var(--text-muted);
}

.hidden {
  display: none !important;
}

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

@media (max-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 2.4rem;
  }

  .hero-card {
    order: -1;
    margin-bottom: 1.8rem;
  }

  .grid.two-col,
  .grid.three-col {
    grid-template-columns: minmax(0, 1fr);
  }

  .timeline::before {
    left: 10px;
  }

  .timeline-marker {
    left: 2px;
  }
}

@media (max-width: 720px) {
  .nav-links {
    position: absolute;
    inset-inline: 0;
    top: 64px;
    padding: 0.75rem 1.5rem 1rem;
    flex-direction: column;
    gap: 0.6rem;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border-subtle);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-med), transform var(--transition-med);
  }

  .nav-links.nav-open {
    opacity: 1;
    pointer-events: auto;
    transform: scaleY(1);
  }

  .menu-button {
    display: inline-flex;
  }

  .section {
    padding-top: 1.8rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.6rem;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 2.15rem;
  }

  .hero-meta {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-card {
    padding: 1.1rem 1.1rem;
  }
}

/* ============================
   CARD HOVER ANIMATIONS
   ============================ */

.card {
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(56, 189, 248, 0.08),
    0 8px 24px rgba(15, 23, 42, 0.35);
  border-color: rgba(56, 189, 248, 0.25);
}

body.light-theme .card:hover {
  box-shadow: 0 20px 50px rgba(37, 99, 235, 0.08),
    0 8px 24px rgba(15, 23, 42, 0.12);
  border-color: rgba(37, 99, 235, 0.25);
}

/* Project card gradient border glow */
.project-card {
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.3s ease;
}

.project-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-md);
  padding: 1px;
  background: linear-gradient(135deg, transparent, transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s ease, background 0.4s ease;
  pointer-events: none;
  z-index: 1;
}

.project-card:hover::before {
  opacity: 1;
  background: linear-gradient(135deg, var(--accent), #a855f7, #ec4899);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 60px rgba(56, 189, 248, 0.12),
    0 8px 24px rgba(15, 23, 42, 0.35);
}

body.light-theme .project-card:hover {
  box-shadow: 0 24px 60px rgba(37, 99, 235, 0.1),
    0 8px 24px rgba(15, 23, 42, 0.1);
}

/* ============================
   SCROLL-TRIGGERED ANIMATIONS
   ============================ */

.section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* Staggered card animations */
.section.visible .card,
.section.visible .timeline-item {
  animation: cardReveal 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.section.visible .card:nth-child(1),
.section.visible .timeline-item:nth-child(1) {
  animation-delay: 0.05s;
}

.section.visible .card:nth-child(2),
.section.visible .timeline-item:nth-child(2) {
  animation-delay: 0.12s;
}

.section.visible .card:nth-child(3) {
  animation-delay: 0.19s;
}

.section.visible .card:nth-child(4) {
  animation-delay: 0.26s;
}

.section.visible .card:nth-child(5) {
  animation-delay: 0.33s;
}

.section.visible .card:nth-child(6) {
  animation-delay: 0.40s;
}

.section.visible .card:nth-child(7) {
  animation-delay: 0.47s;
}

.section.visible .card:nth-child(8) {
  animation-delay: 0.54s;
}

@keyframes cardReveal {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.97);
  }

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

/* ============================
   HERO ANIMATED BACKGROUND
   ============================ */

.hero {
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 15% 30%, rgba(56, 189, 248, 0.06), transparent),
    radial-gradient(ellipse 500px 350px at 85% 70%, rgba(168, 85, 247, 0.05), transparent);
  animation: heroGlow 8s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
}

body.light-theme .hero::before {
  background:
    radial-gradient(ellipse 600px 400px at 15% 30%, rgba(37, 99, 235, 0.04), transparent),
    radial-gradient(ellipse 500px 350px at 85% 70%, rgba(168, 85, 247, 0.03), transparent);
}

.hero>* {
  position: relative;
  z-index: 1;
}

@keyframes heroGlow {
  0% {
    opacity: 0.5;
    transform: scale(1);
  }

  100% {
    opacity: 1;
    transform: scale(1.05);
  }
}

/* ============================
   CHIP / TAG HOVER STATES
   ============================ */

.chips span {
  transition: background 0.25s ease, color 0.25s ease,
    border-color 0.25s ease, transform 0.25s ease;
  cursor: default;
}

.chips span:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.tag-list li {
  transition: background 0.25s ease, color 0.25s ease,
    border-color 0.25s ease, transform 0.25s ease;
  cursor: default;
}

.tag-list li:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ============================
   ACTIVE NAV LINK
   ============================ */

.nav-links a.active {
  color: var(--accent);
}

.nav-links a.active::after {
  width: 100%;
}

/* ============================
   PROJECT CARD LINK STYLE
   ============================ */

.project-card .project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.5rem;
  font-size: 0.82rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: gap 0.2s ease, color 0.2s ease;
}

.project-card .project-link:hover {
  gap: 0.55rem;
  color: var(--accent-strong);
}

.project-card .project-link .arrow {
  transition: transform 0.2s ease;
}

.project-card .project-link:hover .arrow {
  transform: translateX(3px);
}