/* =========================================
   VARIABLES
========================================= */
:root {
  --accent-color: #000000;
  --accent-color-alpha: rgba(0,0,0,0.08);
  --bg-color: #fafafa;
  --primary-text: rgba(0,0,0,0.88);
  --secondary-text: rgba(0,0,0,0.55);
  --tertiary-text: rgba(0,0,0,0.35);
  --border-color: rgba(0,0,0,0.08);
  --hover-bg: rgba(0,0,0,0.04);
  --glass-bg: rgba(242,242,242,0.7);
  --edge-highlight: inset 0 1px 0 rgba(255,255,255,0.15);
  --shadow-glass: 0 2px 12px rgba(0,0,0,0.08);
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-raised: 0 8px 30px rgba(0,0,0,0.08);
  --font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', monospace;
  --hero-size: clamp(3.5rem, 10vw, 7rem);
  --section-size: clamp(1.5rem, 3.5vw, 2rem);
  --font-size-xs: 0.75rem;
  --font-size-small: 0.875rem;
  --font-size-base: 1rem;
  --font-size-large: 1.125rem;
  --font-size-x-large: 1.375rem;
  --font-size-xx-large: 1.75rem;
  --container-max: 52rem;
  --container-padding: 2rem;
  --section-padding: 5rem 0;
  --rounded-corner: 0.625rem;
  --rounded-corner-small: 0.375rem;
  --transition-smooth: all 0.2s cubic-bezier(0.4,0,0.2,1);
  --transition-bounce: all 0.4s cubic-bezier(0.16,1,0.3,1);
  --blur: saturate(1.8) blur(0.75rem);
}

[data-theme='dark'] {
  --accent-color: #ffffff;
  --accent-color-alpha: rgba(255,255,255,0.07);
  --bg-color: #000000;
  --primary-text: rgba(255,255,255,0.92);
  --secondary-text: rgba(255,255,255,0.5);
  --tertiary-text: rgba(255,255,255,0.3);
  --border-color: rgba(255,255,255,0.07);
  --hover-bg: rgba(255,255,255,0.04);
  --glass-bg: rgba(10,10,10,0.85);
  --edge-highlight: inset 0 1px 0 rgba(255,255,255,0.04);
  --shadow-glass: 0 2px 12px rgba(0,0,0,0.5);
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-raised: 0 8px 30px rgba(0,0,0,0.6);
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1.25rem;
    --section-padding: 3.5rem 0;
  }
}

/* =========================================
   ANIMATIONS
========================================= */
@keyframes fadeIn {
  from { opacity: 0; filter: blur(4px); }
  to   { opacity: 1; filter: blur(0); }
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); filter: blur(4px); }
  to   { opacity: 1; transform: translateY(0);    filter: blur(0); }
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-20px); filter: blur(4px); }
  to   { opacity: 1; transform: translateY(0);     filter: blur(0); }
}
@keyframes pulse {
  0%,100% { transform: scale(1);   opacity: 1; }
  50%      { transform: scale(1.3); opacity: 0.7; }
}

/* =========================================
   RESET & BASE
========================================= */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
}
input, textarea, select {
  user-select: text;
  -webkit-user-select: text;
}
html {
  scroll-behavior: smooth;
  scrollbar-color: var(--accent-color) transparent;
  accent-color: var(--accent-color);
}
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 2px; }

body {
  font-family: var(--font-family);
  font-weight: 400;
  line-height: 1.6;
  color: var(--primary-text);
  background: var(--bg-color);
  font-size: var(--font-size-base);
  letter-spacing: -0.005em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
}
::selection { background: transparent; color: inherit; }
:focus-visible { outline: 0.125rem solid var(--accent-color); outline-offset: 0.125rem; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
h1 { font-weight: 700; }

a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-smooth);
}
a:hover { opacity: 0.7; }

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

.fade-in {
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}
.slide-up {
  opacity: 0;
  transform: translateY(20px);
  animation: slideUp 0.6s ease forwards;
}

/* =========================================
   READING PROGRESS BAR
========================================= */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 1px;
  background: var(--accent-color);
  width: 0%;
  z-index: 9998;
  transition: width 0.1s ease-out;
}

/* =========================================
   NAVBAR
========================================= */
#site-nav {
  position: fixed;
  top: 0.75rem;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  padding: 0 1rem;
  animation: slideDown 0.6s cubic-bezier(0.16,1,0.3,1) both;
  transition: transform 0.4s cubic-bezier(0.16,1,0.3,1), opacity 0.35s ease;
}
#site-nav.nav-hidden {
  transform: translateY(calc(-100% - 1.5rem));
  opacity: 0;
  pointer-events: none;
}
#site-nav nav {
  width: auto;
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-radius: 999px;
  box-shadow: var(--shadow-glass), var(--edge-highlight);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.5rem;
}
#site-nav nav ul {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
}
.nav-divider {
  width: 1px;
  height: 1.25rem;
  background: var(--border-color);
  margin: 0 0.25rem;
  flex-shrink: 0;
}
#home-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  color: var(--primary-text);
  font-weight: 600;
  font-size: var(--font-size-small);
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}
#home-link:hover { background: var(--hover-bg); opacity: 1; }
#home-link svg { width: 1rem; height: 1rem; flex-shrink: 0; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  color: var(--secondary-text);
  font-weight: 600;
  font-size: var(--font-size-small);
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}
.nav-link:hover { background: var(--hover-bg); color: var(--primary-text); opacity: 1; }
.nav-link.active { background: var(--accent-color-alpha); color: var(--accent-color); }

#theme-switcher { display: flex; align-items: center; gap: 0.1rem; }
.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--secondary-text);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  padding: 0;
}
.theme-btn svg { width: 0.875rem; height: 0.875rem; }
.theme-btn:hover { background: var(--hover-bg); color: var(--primary-text); }
.theme-btn.active { background: var(--accent-color-alpha); color: var(--accent-color); }

.nav-icon-link { padding: 0.4rem; }
.nav-icon-link svg { width: 1rem; height: 1rem; }

@media (max-width: 768px) {
  #site-nav { display: none; }
}

/* =========================================
   HERO
========================================= */
.site-header {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  position: relative;
  padding-top: 5rem;
}
.hero-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--tertiary-text);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero-name {
  font-size: var(--hero-size);
  font-weight: 700;
  letter-spacing: -0.04em;
  margin: 0;
  color: var(--primary-text);
  line-height: 0.95;
  text-transform: lowercase;
}
.hero-name-line { display: block; }
.hero-name-line:first-child { margin-bottom: 0.05em; }
.name-char {
  display: inline-block;
  margin-right: 0.01em;
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}
.hero-title {
  font-size: var(--font-size-large);
  color: var(--secondary-text);
  margin: 2rem 0 0;
  font-weight: 400;
  line-height: 1.5;
  max-width: 30rem;
}
.hero-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.hero-links a {
  color: var(--secondary-text);
  font-size: var(--font-size-xs);
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: transparent;
  transition: var(--transition-smooth);
}
.hero-links a:hover {
  background: var(--accent-color);
  color: var(--bg-color);
  border-color: var(--accent-color);
  transform: translateY(-1px);
  opacity: 1;
}

@media (max-width: 768px) {
  .site-header { min-height: 70vh; padding-top: 3rem; }
}

/* =========================================
   BACK TO TOP
========================================= */
#backToTop {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 2.25rem;
  height: 2.25rem;
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  color: var(--primary-text);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glass);
}
#backToTop.visible { opacity: 1; visibility: visible; transform: translateY(0); }
#backToTop:hover {
  background: var(--accent-color);
  color: var(--bg-color);
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

/* =========================================
   SECTION SHARED
========================================= */
.section {
  position: relative;
  padding: var(--section-padding);
}
.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0 0 1.25rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}
.section-number {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--tertiary-text);
  font-weight: 500;
  letter-spacing: 0.05em;
  white-space: nowrap;
  flex-shrink: 0;
}
.section-title {
  font-size: var(--section-size);
  font-weight: 600;
  margin: 0;
  color: var(--primary-text);
  letter-spacing: -0.03em;
  text-transform: lowercase;
  line-height: 1.2;
}

@media (max-width: 768px) {
  .section-header { padding: 0 0 1rem; margin-bottom: 1.5rem; }
}

/* =========================================
   ABOUT
========================================= */
.about-content { display: flex; flex-direction: column; gap: 1rem; }
.about-content p {
  font-size: var(--font-size-base);
  line-height: 1.75;
  color: var(--secondary-text);
  max-width: 36rem;
}

@media (max-width: 768px) {
  .about-content p { font-size: var(--font-size-small); }
}

/* =========================================
   HIGHLIGHTS
========================================= */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--rounded-corner);
  overflow: hidden;
  background: var(--border-color);
}
.highlight-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem;
  background: var(--bg-color);
}
.highlight-metric {
  font-size: var(--font-size-x-large);
  font-weight: 600;
  color: var(--primary-text);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.highlight-label {
  font-size: var(--font-size-xs);
  color: var(--tertiary-text);
  line-height: 1.4;
  font-weight: 400;
}

@media (max-width: 768px) {
  .highlights-grid { grid-template-columns: repeat(2, 1fr); }
}

/* =========================================
   FEATURED PROJECTS (flagship cards)
========================================= */
.flagship-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 3rem;
}
.flagship {
  padding: 2rem;
  border: 1px solid var(--border-color);
  border-radius: var(--rounded-corner);
  background: var(--glass-bg);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  transition: var(--transition-smooth);
  position: relative;
  display: flex;
  flex-direction: column;
}
.flagship:hover {
  border-color: var(--accent-color);
  box-shadow: var(--shadow-raised);
  transform: translateY(-2px);
}
.flagship-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}
.flagship-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--accent-color);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.flagship-title {
  font-size: var(--font-size-xx-large);
  font-weight: 600;
  color: var(--primary-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}
.flagship-description {
  color: var(--secondary-text);
  font-size: var(--font-size-base);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}
.flagship-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-bottom: 1.5rem;
}
.tech-tag {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--tertiary-text);
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  text-transform: lowercase;
}
.flagship-links { display: flex; gap: 0.75rem; margin-top: auto; }
.flagship-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--primary-text);
  font-size: var(--font-size-small);
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}
.flagship-link:hover {
  background: var(--accent-color);
  color: var(--bg-color);
  border-color: var(--accent-color);
  opacity: 1;
  transform: none;
}
.flagship-link svg { width: 14px; height: 14px; }

@media (max-width: 768px) {
  .flagship { padding: 1.5rem; }
  .flagship-title { font-size: var(--font-size-x-large); }
  .flagship-grid { grid-template-columns: 1fr; }
}

/* =========================================
   ALL PROJECTS (list rows)
========================================= */
.subsection-title {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--tertiary-text);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}
.projects-list { display: flex; flex-direction: column; gap: 0; }
.project-row {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  position: relative;
  transition: var(--transition-smooth);
}
.project-row:last-child { border-bottom: none; }
.project-row:hover { transform: translateX(4px); }
.project-tech-label {
  background: transparent;
  color: var(--tertiary-text);
  padding: 0;
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: none;
  font-family: var(--font-mono);
  margin-bottom: 0.5rem;
  display: block;
}
.project-row h3 {
  font-size: var(--font-size-x-large);
  font-weight: 600;
  margin: 0 0 0.35rem;
  color: var(--primary-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.project-row p {
  color: var(--secondary-text);
  line-height: 1.6;
  margin-bottom: 0.75rem;
  font-size: var(--font-size-small);
  font-weight: 400;
}
.project-links { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--secondary-text);
  font-size: var(--font-size-xs);
  font-weight: 500;
  font-family: var(--font-mono);
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}
.project-link:hover {
  background: var(--accent-color);
  color: var(--bg-color);
  border-color: var(--accent-color);
  opacity: 1;
}
.project-link svg { width: 12px; height: 12px; }

@media (max-width: 768px) {
  .project-row { padding: 1.25rem 0; }
}

/* =========================================
   SKILLS / STACK
========================================= */
.skills-grouped {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 1.5rem;
}
.skill-group { display: flex; flex-direction: column; gap: 0.75rem; }
.skill-group-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--tertiary-text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.skill-group-items { display: flex; flex-wrap: wrap; gap: 0.375rem; }
.skill-tag {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--secondary-text);
  background: transparent;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}
.skill-tag:hover {
  color: var(--primary-text);
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .skills-grouped { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* =========================================
   CONTACT
========================================= */
.contact-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}
.contact-info-text {
  font-size: var(--font-size-small);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--secondary-text);
}
.contact-links { display: flex; flex-direction: column; gap: 0.25rem; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--secondary-text);
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--rounded-corner-small);
  transition: var(--transition-smooth);
  font-size: var(--font-size-small);
  font-family: var(--font-mono);
  background: transparent;
}
.contact-link:hover {
  background: var(--hover-bg);
  color: var(--primary-text);
  transform: translateX(4px);
  opacity: 1;
}
.contact-form { display: flex; flex-direction: column; gap: 0.75rem; }
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--rounded-corner-small);
  background: var(--bg-color);
  color: var(--primary-text);
  font-family: var(--font-family);
  font-size: var(--font-size-small);
  transition: var(--transition-smooth);
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-color-alpha);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--tertiary-text); }
.submit-button {
  background: transparent;
  color: var(--primary-text);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-family: var(--font-family);
  font-size: var(--font-size-small);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-smooth);
  align-self: flex-start;
}
.submit-button:hover {
  background: var(--accent-color);
  color: var(--bg-color);
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .contact-section { grid-template-columns: 1fr; gap: 2rem; }
}

/* =========================================
   NOTIFICATION TOAST
========================================= */
#notification {
  position: fixed;
  top: 4.5rem;
  right: 1.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--rounded-corner);
  box-shadow: var(--shadow-raised);
  z-index: 10000;
  max-width: 400px;
  font-size: var(--font-size-small);
  line-height: 1.4;
  color: white;
  backdrop-filter: var(--blur);
  display: none;
}
#notification.success { background: rgba(46,160,67,0.9); }
#notification.error   { background: rgba(218,54,51,0.9); }

/* =========================================
   FOOTER
========================================= */
.site-footer {
  margin-top: 3rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
}
.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-left,
.footer-right {
  color: var(--tertiary-text);
  font-size: var(--font-size-xs);
  font-weight: 400;
  letter-spacing: 0.02em;
}

@media (max-width: 768px) {
  .site-footer { margin-top: 2rem; padding: 1.5rem 0; }
}