/* ========================
   1. VARIABLES
   ======================== */

:root {
  /* Backgrounds */
  --bg-page: #f8f9fc;
  --bg-card: #ffffff;

  /* Text */
  --text-heading: #1e1e2e;
  --text-body: #374151;
  --text-muted: #6b7280;

  /* Accent */
  --accent: #5b6ee8;
  --accent-hover: #3d50d4;
  --accent-light: #eef0fd;

  /* Borders */
  --border: #e5e7eb;

  /* Spacing */
  --section-padding: 50px 0 80px;
  --container-width: 1100px;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ========================
   2. RESET & BASE
   ======================== */

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.6;
  padding-top: 70px;
}

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

ul {
  list-style: none;
}

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

/* ========================
   3. TYPOGRAPHY
   ======================== */

body {
  font-family: "Inter", sans-serif;
  font-size: 16px;
}

h1,
h2,
h3 {
  font-family: "Playfair Display", serif;
  color: var(--text-heading);
  line-height: 1.2;
}

h1 {
  font-size: 4rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.25rem;
}

p {
  color: var(--text-body);
  line-height: 1.7;
}

/* ========================
   4. NAVBAR
   ======================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  padding: 0 2rem;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: "Playfair Display", serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.nav-logo:hover,
.nav-logo:focus-visible {
  color: var(--accent-hover);
}

.hamburger {
  display: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links li a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
  position: relative;
  padding-bottom: 4px;
  text-transform: lowercase;
}

.nav-links li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width 0.2s ease;
}

.nav-links li a:hover,
.nav-links li a:focus-visible {
  color: var(--accent);
}

.nav-links li a:hover::after,
.nav-links li a:focus-visible::after {
  width: 100%;
}
.nav-links li a.active {
  color: var(--accent);
}

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

/* ========================
   5. HERO
   ======================== */

.hero {
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
  background-color: var(--bg-page);
}

.hero-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
  padding-bottom: 3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  width: 100%;
}

.hero-text {
  flex: 1;
}

.hero-text p:first-child {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.hero-text h1 {
  color: var(--text-heading);
  margin-bottom: 0.5rem;
  line-height: 1.1;
}

.hero-text h2 {
  font-size: 1.5rem;
  font-family: "Inter", sans-serif;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero-text p:last-of-type {
  font-size: 1rem;
  color: var(--text-body);
  max-width: 480px;
  line-height: 1.8;
  margin-bottom: 2rem;
}
.hero-status {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  background-color: var(--accent-light);
  border: 1px solid #c7ccfa;
  border-radius: 20px;
  padding: 4px 12px;
  margin-bottom: 1.5rem;
}
.hero-buttons {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.profile-card {
  width: 380px;
  height: 380px;
  position: relative;
  cursor: pointer;
  border-radius: 50%;
}

.profile-front,
.profile-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  transition: opacity 0.4s ease;
}

.profile-front {
  opacity: 1;
  z-index: 2;
}

.profile-back {
  opacity: 0;
  z-index: 1;
  background-color: var(--accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  border: 4px solid var(--accent-light);
}

/* Hover — show back face */

.profile-card.flipped .profile-front {
  opacity: 0;
}

.profile-card.flipped .profile-back {
  opacity: 1;
  z-index: 3;
}
.profile-front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--accent-light);
  display: block;
}

.flip-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 45%;
  background: linear-gradient(transparent, rgba(91, 110, 232, 0.85));
  border-radius: 0 0 50% 50%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 1.5rem;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.flip-overlay p {
  font-size: 0.82rem;
  font-weight: 500;
  color: #ffffff;
  letter-spacing: 0.05em;
}

.profile-front:hover .flip-overlay {
  opacity: 1;
}

.flip-back-title {
  font-family: "Playfair Display", serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  pointer-events: none;
}

.flip-icons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
}

.flip-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--bg-card);
  border: 1.5px solid var(--accent-hover);
  transition: all 0.2s ease;
}

.flip-icons a:hover,
.flip-icons a:focus-visible {
  transform: translateY(-2px);
}

.flip-icons img {
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.flip-hint {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.03em;
  pointer-events: none;
}

/* ========================
   6. SKILLS
   ======================== */

.skills {
  padding: var(--section-padding);
  background-color: var(--bg-card);
}

.skills-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.skills-container h2 {
  text-align: center;
  margin-bottom: 5rem;
  color: var(--text-heading);
  position: relative;
}

.skills-container h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 1px;
  background-color: var(--accent);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background-color: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  transition: all 0.2s ease;
  cursor: default;
}

.skill-card:hover,
.skill-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.skill-card img {
  width: 52px;
  height: 52px;
  object-fit: contain;
}

.skill-card p {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-body);
  text-align: center;
}

/* ========================
   7. PROJECTS
   ======================== */

.projects {
  padding: var(--section-padding);
  background-color: var(--bg-page);
}

.projects-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.projects-container h2 {
  text-align: center;
  margin-bottom: 5rem;
  color: var(--text-heading);
  position: relative;
}

.projects-container h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 1px;
  background-color: var(--accent);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all 0.2s ease;
}

.project-card:hover,
.project-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.project-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-info h3 {
  font-size: 1.1rem;
  color: var(--text-heading);
}

.project-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.project-tech span {
  background-color: var(--accent-light);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid #c7ccfa;
}

.project-links {
  display: flex;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.project-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  transition: color 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

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

/* ========================
   8. EXPERIENCE
   ======================== */

.experience {
  padding: var(--section-padding);
  background-color: var(--bg-card);
}

.experience-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.experience-container h2 {
  text-align: center;
  margin-bottom: 5rem;
  color: var(--text-heading);
  position: relative;
}

.experience-container h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 1px;
  background-color: var(--accent);
}

.experience-timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.experience-card {
  background-color: var(--bg-page);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: box-shadow 0.2s ease;
}

.experience-card:hover,
.experience-card:focus-visible {
  box-shadow: var(--shadow-md);
}

.experience-header {
  margin-bottom: 1.25rem;
}

.experience-header h3 {
  font-size: 1.15rem;
  color: var(--text-heading);
  margin-bottom: 0.35rem;
}

.experience-header .company {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.experience-header .company-note {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  font-style: italic;
}

.experience-header .duration {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.experience-points {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding-left: 1.25rem;
  list-style: disc;
}

.experience-points li {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.7;
}

.experience-points li::marker {
  color: var(--accent);
}

/* ========================
   9. EDUCATION
   ======================== */

.education {
  padding: var(--section-padding);
  background-color: var(--bg-page);
}

.education-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.education-container h2 {
  text-align: center;
  margin-bottom: 5rem;
  color: var(--text-heading);
  position: relative;
}

.education-container h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 1px;
  background-color: var(--accent);
}

.education-timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.education-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.education-card:hover,
.education-card:focus-visible {
  box-shadow: var(--shadow-md);
}

.education-card h3 {
  font-size: 1.15rem;
  color: var(--text-heading);
}

.education-card .institution {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
}

.education-card .grade {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ========================
   10. CERTIFICATIONS
   ======================== */

.certifications {
  padding: var(--section-padding);
  background-color: var(--bg-card);
}

.certifications-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.certifications-container h2 {
  text-align: center;
  margin-bottom: 5rem;
  color: var(--text-heading);
  position: relative;
}

.certifications-container h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 1px;
  background-color: var(--accent);
}

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.certification-card {
  background-color: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  transition: all 0.2s ease;
}

.certification-card:hover,
.certification-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.certification-icon {
  font-size: 2rem;
  width: 36px;
  height: 36px;
  background-color: var(--accent-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.certification-info h3 {
  font-size: 1rem;
  color: var(--text-heading);
  margin-bottom: 0.3rem;
}

.certification-info .certification-issuer {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ========================
   11. FOOTER - CONTACT
   ======================== */

.contact {
  min-height: 400px;
  background-color: var(--text-heading);
  padding: 40px 0 30px;
}

.contact-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.contact-container h2 {
  color: #ffffff;
  margin-bottom: 1rem;
  position: relative;
}

.contact-container h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 1px;
  background-color: var(--accent);
}

.contact-subtext {
  font-size: 0.95rem;
  color: #9ca3af;
  max-width: 480px;
  line-height: 1.7;
  margin-top: 1.25rem;
  margin-bottom: 2rem;
}

.contact-links {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  justify-content: center;
  align-items: stretch;
  margin-bottom: 2rem;
  margin-top: 2.5rem;
}

.contact-item {
  flex: 1;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.6rem 1.5rem;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  text-decoration: none;
}

.contact-item:hover,
.contact-item:focus-visible {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: var(--accent);
  transform: translateY(-3px);
}

.contact-item img {
  width: 18px;
  height: 18px;
  opacity: 0.8;
  filter: invert(1);
}

.contact-label {
  font-size: 0.75rem;
  font-weight: 200;
  color: #d1d5db;
  text-transform: capitalize;
  letter-spacing: 0.02em;
}

.contact-item:hover .contact-label,
.contact-item:focus-visible .contact-label {
  color: #ffffff;
}

.contact-footer-note {
  font-size: 0.75rem;
  color: #6b7280;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  width: 100%;
  text-align: center;
}

/* ========================
   12. UTILITIES
   ======================== */

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  font-family: "Inter", sans-serif;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
  border: 2px solid var(--accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background-color: var(--accent);
  color: #ffffff;
}

/* ========================
   13. RESPONSIVE
   ======================== */

/* ======= TABLET — 768px ======= */

@media (max-width: 768px) {
  .hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
  }

  .hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--text-heading);
    border-radius: 2px;
    transition: all 0.3s ease;
  }

  .hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .hamburger.open span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--bg-card);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    padding: 2rem;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition:
      opacity 0.3s ease,
      transform 0.3s ease,
      visibility 0.3s ease;
    pointer-events: none;
  }

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

  .nav-links li a {
    font-size: 1.25rem;
    font-weight: 400;
  }

  /* Hero */
  .hero-container {
    padding: 2rem;
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }

  .hero-text p:last-of-type {
    margin: 0 auto 1rem;
  }

  .hero-text h1 {
    font-size: 3.5rem;
  }

  .hero-text h2 {
    font-size: 1.25rem;
    margin-bottom: 1.25rem;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-social {
    justify-content: center;
  }

  /* Profile card */
  .profile-card {
    width: 260px;
    height: 260px;
  }

  .profile-front img {
    width: 260px;
    height: 260px;
  }

  .profile-back {
    width: 260px;
    height: 260px;
    gap: 1rem;
  }

  .flip-icons {
    gap: 1.25rem;
  }

  .flip-icons a {
    width: 40px;
    height: 40px;
  }

  .flip-icons img {
    width: 18px;
    height: 18px;
  }

  .flip-back-title {
    font-size: 0.95rem;
  }

  .flip-hint {
    font-size: 0.68rem;
  }

  /* Utilities */
  .btn {
    padding: 0.5rem 1.5rem;
    font-size: 0.85rem;
  }

  /* Section headings */
  .skills-container h2,
  .projects-container h2,
  .experience-container h2,
  .education-container h2,
  .certifications-container h2 {
    font-size: 1.75rem;
    margin-bottom: 3rem;
  }

  :root {
    --section-padding: 30px 0 50px;
  }

  .contact-container h2 {
    font-size: 1.75rem;
  }
}

/* ======= MOBILE — 480px ======= */

@media (max-width: 480px) {
  /* Hero */
  .hero-text h1 {
    font-size: 2rem;
  }

  .hero-text h2 {
    font-size: 1.2rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  /* Profile card*/
  .profile-card {
    width: 200px;
    height: 200px;
  }

  .profile-front img {
    width: 200px;
    height: 200px;
  }

  .profile-back {
    width: 200px;
    height: 200px;
    gap: 0.75rem;
  }

  .flip-icons {
    gap: 1rem;
  }

  .flip-icons a {
    width: 34px;
    height: 34px;
  }

  .flip-icons img {
    width: 15px;
    height: 15px;
  }

  .flip-back-title {
    font-size: 0.85rem;
  }

  .flip-hint {
    display: none;
  }

  /* Utilities */
  .btn {
    padding: 0.5rem 1.2rem;
    font-size: 0.8rem;
  }

  /* Section headings */
  .skills-container h2,
  .projects-container h2,
  .experience-container h2,
  .education-container h2,
  .certifications-container h2 {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
  }

  :root {
    --section-padding: 20px 0 40px;
  }

  /* Cards */
  .experience-card,
  .education-card,
  .certification-card {
    padding: 1.25rem;
  }

  /* Footer */
  .contact {
    padding-top: 20px;
  }
  .contact-links {
    gap: 0.75rem;
  }
  .contact-item {
    flex-direction: column;
    align-items: center;
    padding: 0.6rem 0.75rem;
    min-width: 70px;
  }

  .contact-container h2 {
    font-size: 1.5rem;
  }

  .contact-subtext {
    font-size: 0.875rem;
  }

  .contact-value {
    font-size: 0.82rem;
  }

  .contact-footer-note {
    font-size: 0.75rem;
  }

  .contact-links {
    max-width: 100%;
  }
}
/* ========================
   14. REDUCED MOTION
   ======================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}