:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --text: #172033;
  --muted: #5d687b;
  --accent: #2563eb;
  --accent-2: #7c3aed;
  --border: rgba(23, 32, 51, 0.10);
  --shadow: 0 16px 45px rgba(20, 30, 55, 0.10);
  --header-bg: rgba(247, 249, 252, 0.82);
  --max-width: 1080px;
  --radius: 16px;
  --transition: 180ms ease;
}

html.dark {
  --bg: #08111f;
  --surface: #0d1a2d;
  --surface-2: #12233b;
  --text: #e7edf7;
  --muted: #9eabc0;
  --accent: #64a5ff;
  --accent-2: #a78bfa;
  --border: rgba(231, 237, 247, 0.10);
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.25);
  --header-bg: rgba(8, 17, 31, 0.82);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  min-height: 100vh;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 5%, rgba(37, 99, 235, 0.09), transparent 30rem),
    radial-gradient(circle at 85% 30%, rgba(124, 58, 237, 0.08), transparent 30rem),
    var(--bg);
  transition: background var(--transition), color var(--transition);
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

ul {
  list-style: none;
}

.container {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

.section {
  padding-block: 100px;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  position: relative;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

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

.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  border-radius: 99px;
  background: var(--accent);
}

.theme-toggle,
.menu-toggle {
  border: 0;
  color: var(--text);
  background: transparent;
  cursor: pointer;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 1.05rem;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
}

.menu-toggle span {
  display: block;
  width: 23px;
  height: 2px;
  margin: 5px auto;
  background: var(--text);
  transition: transform var(--transition);
}

.hero {
  min-height: 88vh;
  display: grid;
  align-items: center;
  padding-top: 150px;
}

.hero-content {
  max-width: 850px;
}

.eyebrow,
.date {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin-top: 10px;
  font-size: clamp(3.5rem, 10vw, 7.5rem);
  line-height: 0.98;
  letter-spacing: -0.065em;
}

.hero h2 {
  margin-top: 20px;
  color: var(--muted);
  font-size: clamp(1.5rem, 4vw, 2.8rem);
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.hero-text {
  max-width: 680px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 10px;
  font-weight: 700;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.button-secondary {
  border: 1px solid var(--border);
  background: var(--surface);
}

.button-resume {
  border: 1px solid var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
  gap: 8px;
}

.button-resume:hover {
  background: color-mix(in srgb, var(--accent) 15%, var(--surface));
  color: var(--accent);
  border-color: var(--accent);
}

.button-resume svg {
  flex-shrink: 0;
}

.nav-resume-btn {
  padding: 6px 14px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: var(--accent) !important;
  font-size: 0.85rem;
  font-weight: 700;
  transition: background var(--transition), transform var(--transition);
}

.nav-resume-btn:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  transform: translateY(-1px);
}

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

.section-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 45px;
}

.section-heading span {
  color: var(--accent);
  font-family: monospace;
  font-weight: 700;
}

.section-heading h2 {
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  letter-spacing: -0.04em;
}

.section-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  margin-left: 10px;
  background: var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 70px;
  align-items: center;
}

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

.about-text p + p {
  margin-top: 18px;
}

.about-text h3 {
  margin-top: 30px;
  margin-bottom: 12px;
  color: var(--text);
}

.tech-list,
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.tech-list li,
.project-tech li {
  color: var(--muted);
  font-family: monospace;
  font-size: 0.85rem;
}

.tech-list li::before {
  content: "▹ ";
  color: var(--accent);
}

.photo-placeholder,
.about-photo-wrapper {
  position: relative;
  max-width: 320px;
  width: 100%;
  margin-inline: auto;
}

.photo-placeholder {
  aspect-ratio: 4 / 5;
  display: grid;
  place-content: center;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.about-photo-card {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.about-photo-card:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: 0 22px 50px rgba(20, 30, 55, 0.15);
}

.about-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 15%;
  display: block;
}

.photo-placeholder span {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.photo-placeholder small {
  max-width: 190px;
  margin-top: 8px;
  color: var(--muted);
}

.timeline {
  position: relative;
  max-width: 850px;
  margin-left: 10px;
  padding-left: 35px;
  border-left: 1px solid var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 35px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -41px;
  top: 5px;
  width: 11px;
  height: 11px;
  border: 3px solid var(--bg);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.timeline-card,
.info-card,
.skill-card,
.project-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.timeline-card {
  padding: 25px;
}

.timeline-card h3,
.info-card h3,
.skill-card h3,
.project-card h3 {
  margin-top: 5px;
  font-size: 1.15rem;
}

.company,
.muted {
  color: var(--muted);
}

.timeline-card ul {
  margin-top: 15px;
  color: var(--muted);
}

.timeline-card li {
  position: relative;
  padding-left: 18px;
}

.timeline-card li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.education-grid,
.skills-grid,
.projects-grid {
  display: grid;
  gap: 24px;
}

.education-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
}

.info-card,
.skill-card {
  padding: 26px;
}

.info-card p:last-child {
  margin-top: 12px;
  color: var(--muted);
}

.skills-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
}

.skill-card ul {
  margin-top: 16px;
}

.skill-card li {
  padding-block: 7px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.skill-card strong {
  color: var(--text);
  font-weight: 600;
}

.skill-card li:last-child {
  border-bottom: 0;
}

.projects-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 310px), 1fr));
}

.project-card {
  min-height: 290px;
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: 0 20px 45px rgba(20, 30, 55, 0.12);
}

.project-image-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}

.project-card:hover .project-image {
  transform: scale(1.04);
}

.project-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.folder {
  color: var(--accent);
  font-size: 1.5rem;
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-links a {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

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

.project-card h3 {
  margin-top: 16px;
  font-size: 1.25rem;
}

.project-card p,
.project-content p {
  margin-top: 10px;
  color: var(--muted);
}

.project-tech {
  margin-top: auto;
  padding-top: 22px;
}

.contact-section {
  padding-bottom: 130px;
}

.contact-box {
  max-width: 760px;
  margin-inline: auto;
  padding: 60px 30px;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.contact-box h2 {
  margin-top: 10px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.05em;
}

.contact-box > p:not(.eyebrow) {
  max-width: 580px;
  margin: 18px auto 28px;
  color: var(--muted);
}

.footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-inner {
  min-height: 130px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 30px;
  align-items: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer strong {
  color: var(--text);
}

.footer p {
  margin-top: 3px;
}

.social-links {
  display: flex;
  gap: 18px;
}

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

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
}

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

.toast {
  position: fixed;
  left: 50%;
  bottom: 25px;
  z-index: 2000;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow);
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
}

.toast.show {
  transform: translate(-50%, 0);
  opacity: 1;
}

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

.contact-form-box {
  max-width: 820px;
  text-align: left;
}

.contact-form-box > .eyebrow,
.contact-form-box > h2,
.contact-form-box > p:not(.eyebrow) {
  text-align: center;
}

.contact-form {
  margin-top: 34px;
}

.contact-form label {
  display: block;
  margin-top: 18px;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 700;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.contact-form input:not([type="checkbox"]),
.contact-form textarea {
  display: block;
  width: 100%;
  margin-top: 7px;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  color: var(--text);
  background: var(--bg);
  font: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.contact-form textarea {
  resize: vertical;
  min-height: 150px;
}

.contact-form input:not([type="checkbox"]):focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--muted);
  opacity: 0.75;
}

.hidden-field {
  position: absolute !important;
  left: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 24px;
}

.form-note {
  color: var(--muted);
  font-size: 0.82rem;
}

.form-status {
  min-height: 1.5em;
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.88rem;
}

.form-status.success {
  color: #15803d;
}

.form-status.error {
  color: #b91c1c;
}

html.dark .form-status.success {
  color: #4ade80;
}

html.dark .form-status.error {
  color: #f87171;
}

.button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

@media (max-width: 850px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    right: 20px;
    width: min(280px, calc(100vw - 40px));
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--surface);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition);
  }

  .nav-links.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-links a {
    padding: 11px 8px;
  }

  .nav-links a.active::after {
    display: none;
  }

  .theme-toggle {
    width: 100%;
    border-radius: 8px;
    text-align: left;
    padding-left: 8px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .photo-placeholder,
  .about-photo-wrapper {
    max-width: 320px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-block: 28px;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .section {
    padding-block: 75px;
  }

  .hero {
    min-height: 80vh;
    padding-top: 125px;
  }

  .hero h1 {
    font-size: clamp(3rem, 17vw, 5rem);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }

  .section-heading {
    margin-bottom: 30px;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-dot {
    left: -30px;
  }

  .timeline-card,
  .info-card,
  .skill-card,
  .project-card {
    padding: 21px;
  }

  .contact-box {
    padding: 45px 20px;
  }

  .back-to-top {
    right: 14px;
    bottom: 14px;
  }

}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}