:root {
  --bg: #0b1020;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-2: rgba(255, 255, 255, 0.09);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.72);
  --border: rgba(255, 255, 255, 0.12);
  --accent: #22c7b8; /* teal */
  --accent-2: #18a7ff; /* cool blue for depth */
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.25);

  --container: 1100px;
  --radius: 14px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 700px at 20% 10%, rgba(34, 199, 184, 0.22), transparent 55%),
    radial-gradient(900px 600px at 85% 25%, rgba(24, 167, 255, 0.14), transparent 60%),
    var(--bg);
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(34, 199, 184, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(24, 167, 255, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(34, 199, 184, 0.08) 0%, transparent 50%);
  animation: backgroundShift 20s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes backgroundShift {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 1;
  }
  33% {
    transform: translate(2%, 3%) scale(1.05);
    opacity: 0.95;
  }
  66% {
    transform: translate(-2%, -3%) scale(0.98);
    opacity: 0.9;
  }
}

main,
.site-header,
.site-footer {
  position: relative;
  z-index: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 1rem;
  background: #fff;
  color: #000;
  padding: 0.6rem 0.9rem;
  border-radius: 10px;
  z-index: 9999;
}

.skip-link:focus {
  left: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(11, 16, 32, 0.65);
  border-bottom: 1px solid var(--border);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.05);
}

.scroll-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px rgba(34, 199, 184, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #061028;
  box-shadow: var(--shadow);
  font-size: 0.95rem;
}

.brand-text {
  color: var(--text);
  letter-spacing: 0.2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.nav-link {
  color: var(--muted);
  font-weight: 600;
  padding: 0.45rem 0.6rem;
  border-radius: 12px;
  position: relative;
}

.nav-link:hover {
  text-decoration: none;
  background: var(--surface);
  color: var(--text);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 6px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transform: scaleX(0.4);
  transform-origin: left;
  transition: opacity 160ms ease, transform 160ms ease;
}

.nav-link:hover::after {
  opacity: 0.55;
  transform: scaleX(1);
}

.nav-link.is-active {
  background: linear-gradient(135deg, rgba(34, 199, 184, 0.22), rgba(24, 167, 255, 0.14));
  color: var(--text);
  border: 1px solid var(--border);
}

.nav-link.is-active::after {
  opacity: 1;
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.55rem 0.55rem;
  cursor: pointer;
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 4px 2px;
  border-radius: 2px;
  opacity: 0.9;
}

/* Hero */
.hero {
  padding: 4.2rem 0 2.5rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 1.5rem;
  align-items: stretch;
}

.eyebrow {
  margin: 0 0 0.3rem;
  color: var(--muted);
  font-weight: 600;
}

h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2.1rem, 4.2vw, 3.2rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 0 1.2rem;
  color: var(--muted);
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 0.2rem 0 1.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: linear-gradient(135deg, rgba(34, 199, 184, 0.92), rgba(24, 167, 255, 0.62));
  color: #03131a;
  font-weight: 800;
  box-shadow: var(--shadow);
  transition: transform 140ms ease, filter 140ms ease;
}

.btn:hover {
  text-decoration: none;
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0px);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  box-shadow: none;
}

.btn--ghost:hover {
  background: var(--surface);
}

.meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--muted);
}

.meta-label {
  color: var(--text);
  font-weight: 700;
}

.hero-card {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.04));
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.avatar {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-weight: 900;
  letter-spacing: 0.04em;
  animation: floaty 4.6s ease-in-out infinite;
}

@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-3px);
  }
}

.hero-card__body {
  margin-top: 0.9rem;
}

.hero-card__title {
  margin: 0.8rem 0 0.15rem;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.95rem;
}

.hero-card__text {
  margin: 0;
}

/* Sections */
.section {
  padding: 3.2rem 0;
}

.section--alt {
  background: rgba(255, 255, 255, 0.03);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

h2 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}

.section-subtitle {
  margin: 0;
  color: var(--muted);
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  transition: transform 170ms ease, border-color 170ms ease, background 170ms ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(34, 199, 184, 0.35);
  background: rgba(255, 255, 255, 0.065);
}

.card h3 {
  margin: 0 0 0.4rem;
}

.card p {
  margin: 0.3rem 0 0;
  color: var(--muted);
}

.project-links {
  display: flex;
  gap: 0.9rem;
  margin-top: 0.9rem;
  font-weight: 700;
}

.project[role="button"] {
  cursor: pointer;
}

.project[role="button"]:focus-visible {
  outline: 3px solid rgba(34, 199, 184, 0.35);
  outline-offset: 2px;
}

.project-links a {
  color: rgba(255, 255, 255, 0.84);
}

.project-links a:hover {
  color: #fff;
}

.tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.85rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.chip {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.55rem 0.75rem;
  border-radius: 999px;
  color: var(--text);
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 150ms ease, border-color 150ms ease, background 150ms ease;
}

.chip:hover {
  transform: translateY(-1px);
  border-color: rgba(34, 199, 184, 0.45);
  background: rgba(34, 199, 184, 0.08);
}

.link-list {
  margin: 0.6rem 0 0;
  padding-left: 1.05rem;
  color: var(--muted);
}

/* Form */
.form label {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.85rem;
  color: var(--muted);
  font-weight: 700;
}

.form label:first-child {
  margin-top: 0;
}

input,
textarea {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 0.7rem 0.8rem;
  font: inherit;
  outline: none;
}

input:focus,
textarea:focus {
  border-color: rgba(34, 199, 184, 0.7);
  box-shadow: 0 0 0 3px rgba(34, 199, 184, 0.18);
}

.form .btn {
  margin-top: 1rem;
  width: 100%;
}

.form-note {
  margin: 0.6rem 0 0;
  color: var(--muted);
  min-height: 1.2em;
}

/* Footer */
.site-footer {
  padding: 1.6rem 0 2.2rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 1.2rem;
  color: var(--muted);
}

.to-top {
  font-weight: 800;
  color: var(--text);
}

/* Timeline */
.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(34, 199, 184, 0.7), rgba(24, 167, 255, 0.25));
  opacity: 0.7;
}

.timeline-item {
  position: relative;
  padding-left: 52px;
  margin: 0 0 1rem;
}

.timeline-dot {
  position: absolute;
  left: 7px;
  top: 18px;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
}

.timeline-card {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
}

.timeline-meta {
  margin: 0.2rem 0 0.5rem;
  color: var(--muted);
  font-weight: 800;
  letter-spacing: 0.02em;
  font-size: 0.9rem;
}

/* Scroll reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 520ms ease, transform 520ms ease;
  will-change: opacity, transform;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    transition: none;
    transform: none;
    opacity: 1;
  }

  .btn,
  .card,
  .chip {
    transition: none;
  }

  .avatar {
    animation: none;
  }
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  z-index: 200;
}

.modal.is-open {
  display: block;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
}

.modal__dialog {
  position: relative;
  width: min(560px, calc(100% - 2rem));
  margin: 12vh auto 0;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(11, 16, 32, 0.92);
  box-shadow: 0 18px 55px rgba(0, 0, 0, 0.45);
  padding: 1.2rem;
  transform: translateY(10px);
  opacity: 0;
  animation: modalIn 220ms ease forwards;
}

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

.modal__close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}

.modal__close:hover {
  background: rgba(255, 255, 255, 0.08);
}

.modal__title {
  margin: 0 2.4rem 0.4rem 0;
}

.modal__desc {
  margin: 0.25rem 0 0.65rem;
  color: var(--muted);
}

.modal__stack {
  margin: 0 0 1rem;
  color: rgba(34, 199, 184, 0.92);
  font-weight: 800;
}

.modal__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

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

/* Responsive */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    right: 1rem;
    top: 64px;
    min-width: 220px;
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    padding: 0.6rem;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: rgba(11, 16, 32, 0.92);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease, transform 160ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-link {
    padding: 0.7rem 0.75rem;
  }

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

  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Chatbot */
.chatbot-button {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none;
  color: #03131a;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(34, 199, 184, 0.4);
  z-index: 100;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.chatbot-button:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 12px 32px rgba(34, 199, 184, 0.5);
}

.chatbot-button:active {
  transform: translateY(0) scale(1);
}

.chatbot-panel {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: min(420px, calc(100vw - 2rem));
  height: min(600px, calc(100vh - 4rem));
  max-height: 85vh;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: rgba(11, 16, 32, 0.98);
  backdrop-filter: blur(20px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  z-index: 100;
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  pointer-events: none;
  transition: opacity 250ms ease, transform 250ms ease;
}

.chatbot-panel.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.chatbot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.2rem 1rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

.chatbot-header__info {
  flex: 1;
}

.chatbot-header__title {
  margin: 0 0 0.2rem;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text);
}

.chatbot-header__subtitle {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.chatbot-close {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 150ms ease;
}

.chatbot-close:hover {
  background: rgba(255, 255, 255, 0.1);
}

.chatbot-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scroll-behavior: smooth;
}

.chatbot-messages::-webkit-scrollbar {
  width: 6px;
}

.chatbot-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chatbot-messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}

.chatbot-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

.chatbot-message {
  display: flex;
  max-width: 85%;
  animation: messageSlideIn 200ms ease;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.chatbot-message--user {
  align-self: flex-end;
  margin-left: auto;
}

.chatbot-message--bot {
  align-self: flex-start;
}

.chatbot-message__content {
  padding: 0.75rem 1rem;
  border-radius: 16px;
  line-height: 1.5;
  word-wrap: break-word;
}

.chatbot-message--user .chatbot-message__content {
  background: linear-gradient(135deg, rgba(34, 199, 184, 0.9), rgba(24, 167, 255, 0.7));
  color: #03131a;
  border-bottom-right-radius: 4px;
  font-weight: 600;
}

.chatbot-message--bot .chatbot-message__content {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.chatbot-message--typing .chatbot-message__content {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border);
  padding: 0.9rem 1.1rem;
}

.typing-dots {
  display: inline-flex;
  gap: 4px;
  align-items: center;
}

.typing-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--muted);
  animation: typingDot 1.4s ease-in-out infinite;
}

.typing-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typingDot {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.5;
  }
  30% {
    transform: translateY(-6px);
    opacity: 1;
  }
}

.chatbot-input-container {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.2rem;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.chatbot-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font: inherit;
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.chatbot-input:focus {
  border-color: rgba(34, 199, 184, 0.6);
  box-shadow: 0 0 0 3px rgba(34, 199, 184, 0.15);
}

.chatbot-input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.chatbot-send {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(34, 199, 184, 0.9), rgba(24, 167, 255, 0.7));
  color: #03131a;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 150ms ease, filter 150ms ease;
  flex-shrink: 0;
}

.chatbot-send:hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.1);
}

.chatbot-send:active:not(:disabled) {
  transform: translateY(0);
}

.chatbot-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 480px) {
  .chatbot-button {
    bottom: 1rem;
    right: 1rem;
    width: 52px;
    height: 52px;
  }

  .chatbot-panel {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
    width: auto;
    height: min(650px, calc(100vh - 2rem));
  }

  .chatbot-message {
    max-width: 90%;
  }
}

@media (prefers-reduced-motion: reduce) {
  body::before {
    animation: none;
  }

  .chatbot-panel,
  .chatbot-message {
    transition: none;
    animation: none;
  }

  .typing-dots span {
    animation: none;
  }
}