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

html {
  scroll-behavior: smooth;
}

:root {
  --container-width: 1200px;

  --color-primary: #047857;

  --color-bg-white: #ffffff;
  --color-bg-light: #fafafa;
  --color-bg-card: #f9fafb;

  --color-dark: #000000;

  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;

  --color-text-primary: #000000;
  --color-text-secondary: #6b7280;

  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-36: 36px;
  --spacing-40: 40px;
  --spacing-64: 64px;


  --section-padding-lg: 80px;
  --section-padding-md: 60px;
  --section-padding-sm: 40px;
}

:root.dark-mode {
  --color-bg-white: #0B0F14;
  --color-bg-light: #111827;
  --color-bg-card: #1F2937;

  --color-dark: #FFFFFF;

  --color-text-primary: #F9FAFB;
  --color-text-secondary: #9CA3AF;

  --color-border: #374151;
  --color-border-strong: #4B5563;

  --color-primary: #10B981;
}

body {
  font-family: "Inter", sans-serif;
  color: var(--color-text-primary);
  background-color: var(--color-bg-white);
  margin: 0;
}

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

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  /* background-color: pink; */
}

/* Header */
.navbar {
  padding-top: 32px;
  padding-bottom: 40px;
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.nav-links {
  display: flex;
  gap: var(--spacing-40);
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-primary);
  font-size: 16px;
  font-weight: 500;
}

.logo {
    font-size: 20px;
  font-weight: 500;
}

.menu-toggle {
  display: none;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 16px;
  color: var(--color-text-primary);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--color-primary);
}

/* Hero */
.hero-container {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

@media (max-width: 1199px) {
  .hero-container {
    flex-direction: column;
  }

  .hero-left {
    max-width: 100%;
  }

  .hero-right {
    display: none;
  }
}

.hero {
  padding: var(--section-padding-lg) 0;
}

.hero-left {
  max-width: 600px;
  flex: 1;
}

.hero-intro {
  font-size: 24px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-16);
}

.hero-title {
  font-size: 60px;
  line-height: 72px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-16);
}

.hero-description {
  width: 384px;
  font-size: 18px;
  line-height: 28px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-36)
}

.btn-primary {
  text-decoration: none;
  height: 48px;
  padding: 14px 12px;
  background: var(--color-primary);
  color: #FFFFFF;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
}

.btn-primary:hover {
  background: #065F46;
}

.btn-secondary {
  text-decoration: none;
  height: 48px;
  padding: 14px 12px;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
}

.btn-secondary:hover {
  background: #ECFDF5;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-16)
}

.hero-right {
  position: relative;
  min-height: 360px;
  overflow: visible;
}

.hero-blob {
  position: absolute;
  right: 0px;
  top: 34px;
  width: 420px;
  height: 300px;
  background: var(--color-primary);
  opacity: 0.20;
  filter: blur(120px);
  border-radius: 50%;
}

.code-card {
  position: absolute;
  top: 24px;
  right: 88px;
  transform-origin: bottom left;
  width: 336px;
  height: 192px;
  background: #1F2937;
  border-radius: 12px;
  transform: rotate(6deg);
  overflow: hidden;
}

.code-content {
  padding: 16px;
}

.code-content {
  margin: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  line-height: 20px;
}

.card-header {
  border-radius: 12px 12px 0 0;
  width: 100%;
  height: 28px;
  background-color: #111827;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 12px;
}

.header-circle {
  width: 6px;
  height: 6px;
  background-color: #4B5563;
  border-radius: 50%;
}

.code-div {
  color: #9CA3AF;
}

.code-button {
  color: #E5E7EB;
  padding-left: var(--spacing-16);
}

.indent-1 { padding-left: 16px; }
.indent-2 { padding-left: 32px; }

.ui-card {
  padding-top: 8px;
  position: absolute;
  top: 180px;
  right: 212px;
  width: 300px;
  height: 168px;
  background: #FFFFFF;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  transform: rotate(-4deg);
  box-shadow:
    0 10px 30px rgba(0,0,0,0.08),
    0 2px 6px rgba(0,0,0,0.06);
}

.ui-card p {
  padding: 16px 28px;
  border-top: 1px solid #e5e7eb;
  border-bottom: 1px solid #e5e7eb;
  color: #000000;
  font-weight: 600;
  font-size: 16px;
  line-height: 20px;
}

.card-btn {
  display: block;
  margin: 24px auto 0 auto;
  height: 36px;
  padding: 0 40px;
  background-color: #047857;
  color: #FFFFFF;
  border-radius: 8px;
  font-size: 14px;
  line-height: 20px;
  border: none;
}

/* projects-section */
.projects {
  padding:var(--section-padding-lg) 0;
  background-color: var(--color-bg-light);
}

.projects-header {
  max-width: 520px;
  margin-bottom: var(--spacing-64);
}

.projects-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-12);
}

.projects-description {
  font-size: 16px;
  color: var(--color-text-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: var(--spacing-24);
  row-gap: var(--spacing-32);
  justify-items: center;
  max-width: 100%;
}

.project-card {
  width: 100%;
  max-width: 588px;
  min-height: 424px;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 12px 30px rgba(0,0,0,0.06),
    0 4px 10px rgba(0,0,0,0.04);
}

.project-preview {
  padding: var(--spacing-16);
  background-color: var(--color-bg-card);
  width: 100%;
  height: 200px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: var(--spacing-20);
}

.project-preview img {
  width: 100%;
  height: 168px;
  border-radius: 6px;
  display: block;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  column-gap: var(--spacing-12);
  row-gap: var(--spacing-12);
  justify-content: center;
}

.preview-box {
  width: 248px;
  height: 78px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 8px rgba(0,0,0,0.06);
  overflow: hidden;
}

.preview-light {
  background: #FFFFFF;
}

.preview-dark {
  background: #000000;
}

.preview-box img {
  width: 179px;
  height: 78px;
  object-fit: contain;
}

.project-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-8);
}

.project-description {
  font-size: 16px;
  line-height: 24px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-12);
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  font-size: 14px;
  line-height: 24px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-16);
}

.project-meta span:not(:last-child)::after {
  content: "•";
  margin-left: var(--spacing-4);
}

@media (max-width: 1199px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

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

.project-link {
  font-size: 14px;
  line-height: 24px;
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  gap: var(--spacing-8);
}

.link-arrow {
  color: var(--color-dark);
  text-decoration-line: none;
}

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

.project-source {
  font-size: 14px;
  line-height: 24px;
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  cursor: default;
}

.project-source:hover {
  text-decoration: underline;
}

.project-meta-label {
  font-size: 14px;
  line-height: 24px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.browser-preview {
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: var(--spacing-16);
}

.browser-bar {
  height: 20px;
  background: var(--color-border);
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 6px;
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
}

.browser-bar span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #9CA3AF;
}

.browser-preview img {
  width: 100%;
  height: 148px;
  object-fit: cover;
  display: block;
}

/* About Section */
.about-skills {
  padding: var(--section-padding-lg) 0;
}

.about-skills-container {
  display: flex;
  justify-content: space-between;
  gap: 88px;
}

.about {
  flex: 0 0 50%;
  max-width: 50%;
}

.about-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-24);
}

.about-description {
  width: 100%;
  font-size: 16px;
  line-height: 28px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-16);
}

.about-description:last-of-type {
  margin-bottom: 0;
}

.skills {
  flex: 0 0 50%;
  max-width: 50%;
}

.skills-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-24);
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-12);
}

.skill-tag {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-primary);
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-card);
}

.skill-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

@media (max-width: 1199px) {
  .about-skills-container {
    flex-direction: column;
    gap: var(--spacing-32);
  }
  .about,
  .skills {
    max-width: 100%;
  }
}

/* Contact Section */
.contact {
  padding: var(--section-padding-lg) 0;
  background: var(--color-bg-light);
}

.contact-container {
  display: flex;
  justify-content: space-between;
}

.contact-left {
  flex: 0 0 50%;
  max-width: 50%;
}

.contact-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-12);
}

.contact-description {
  font-size: 16px;
  line-height: 28px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-32);
  max-width: 480px;
}

.contact-email {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-24);
}

.contact-email a {
  font-size: 14px;
  line-height: 24px;
  color: var(--color-primary);
  text-decoration: none;
}

.contact-email a:hover {
  text-decoration: underline;
}

.email-icon img {
  width: 20px;
  height: 20px;
}

.contact-social-label {
  font-size: 14px;
  line-height: 24px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-16);
}

.social-links {
  display: flex;
  gap: var(--spacing-16);
}

.social-link {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-bg-white);
  transition: all 0.2s ease;
}

.social-link img {
  width: 20px;
  height: 20px;
}

.dark-mode .social-link img {
  filter: invert(1);
}

.dark-mode .email-icon img {
  filter: invert(1);
}

.social-link:hover {
  border-color: var(--color-primary);
}

.contact-right {
  display: flex;
  justify-content: flex-end;
  flex: 0 0 50%;
  max-width: 50%;
}

.contact-form {
  width: 480px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 12px;
  font-size: 14px;
  line-height: 24px;
  font-family: inherit;
  border: none;
  border-radius: 8px;
  background: var(--color-border);
  outline: none;
}

.contact-form textarea {
  resize: none;
}

.contact-form input:focus,
.contact-form textarea:focus {
  background: #D1D5DB;
}

.contact-button {
  width: fit-content;
  padding: 12px 20px;
  font-size: 14px;
  line-height: 24px;
  font-weight: 500;
  color: #FFFFFF;
  background: var(--color-primary);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.contact-button:hover {
  background: #065F46;
}

.form-status {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-primary);
}

@media (max-width: 1199px) {
  .contact-container {
    flex-direction: column;
    gap: var(--spacing-32);
  }
  .contact-left,
  .contact-right {
    width: 100%;
    max-width: 480px;
    justify-content: center;
  }
}

/* footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.copyright {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.back-to-top {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.back-to-top:hover {
  color: var(--color-text-primary);
}

/* ---- 1024px Tablet View ---- */
@media (max-width: 1024px) {
  /* Container breathing space */
  .container {
    padding-left: 48px;
    padding-right: 48px;
  }

  /* Section vertical rhythm */
  section {
    padding: 64px 0;
  }

  /* Hero typography scaling */
  .hero-title {
    font-size: 48px;
    line-height: 60px;
  }

  .hero-description {
    max-width: 520px;
  }

  /* Hero buttons wrapping if needed */
  .hero-buttons {
    flex-wrap: wrap;
    gap: var(--spacing-12);
  }

  /* Project cards width control */
  .project-card {
    max-width: 640px;
  }

  /* About section spacing refinement */
  .about-skills-container {
    gap: 56px;
  }

  /* Skills tags readability */
  .skills-list {
    max-width: 520px;
  }

  /* Contact form stability */
  .contact-form {
    width: 100%;
    max-width: 480px;
  }

}

/* ---- 768px Mobile View ---- */

@media (max-width: 768px) {
  /* Container padding reduction */
  .container {
    padding-left: 24px;
    padding-right: 24px;
  }

  /* Section spacing reduction */
  section {
    padding: 56px 0;
  }

  /* Navbar stacking */
  .navbar-container {
    position: relative;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-16);
  }

  .navbar-container,
  .footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .navbar {
    padding-top: 24px;
    padding-bottom: 32px;
  }

  .nav-links {
  position: absolute;
  top: 100%;
  right: 0;
  width: 220px;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
  flex-direction: column;
  gap: 16px;
  display: none;
  z-index: 1000;
}

  .nav-links.active {
    display: flex;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  }

  .menu-toggle {
    display: block;
    cursor: pointer;
    font-size: 22px;
  }

  /* Hero typography scaling */
  .hero {
    padding: var(--section-padding-md) 0;
  }

  .hero-title {
    font-size: 40px;
    line-height: 48px;
  }

  .hero-intro {
    font-size: 20px;
  }

  .hero-description {
    font-size: 16px;
    max-width: 100%;
  }

  /* Project cards padding refinement */
  .projects {
    padding: var(--section-padding-md) 0;
  }

  .project-card {
    max-width: 100%;
    padding: 16px;
  }

  .project-preview {
    height: auto;
    overflow: hidden;
    padding: 12px;
  }

  .preview-grid {
  grid-template-columns: repeat(2,1fr);
}

.project-preview img {
  width: 100%;
  height: 140px;
  object-fit: contain;
}

.preview-box {
  width: 100%;
}

  /* About section stacking refinement */
  .about-skills {
    padding: var(--section-padding-md) 0;
  }
  .about-skills-container {
    gap: var(--spacing-32);
  }

  .about-description {
    max-width: 100%;
  }


  /* Skills tags spacing */
  .skills-list {
    gap: var(--spacing-8);
  }


  /* Contact section stacking polish */
  .contact {
    padding: var(--section-padding-md) 0;
  }

  .contact-description {
    max-width: 100%;
  }

  .contact-form {
    width: 100%;
    max-width: 100%;
  }


  /* Social icons spacing */
  .social-links {
    gap: var(--spacing-8);
  }


  /* Footer alignment */
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  } 
}


/* ---- 480px Mobile View ---- */
@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .navbar {
    padding-top: 16px;
    padding-bottom: 20px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

  .hero-title {
    font-size: 30px;
    line-height: 40px;
  }

  .hero-description {
    width: 100%;
    font-size: 16px;
    line-height: 24px;
  }

  .projects-title,
  .about-title,
  .contact-title {
    font-size: 28px;
  }

  .project-card {
    max-width: 100%;
    padding: 16px;
    height: auto;
  }

  .project-preview img {
    height: auto;
    object-fit: contain;
  }

  .preview-box {
    width: 100%;
    height: auto;
    padding: 12px;
  }

  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
  }

  .preview-box img {
    width: 100%;
    height: auto;
  }

  .contact-form {
    width: 100%;
  }

  .contact-left,
  .contact-right {
    max-width: 100%;
  }

}