/* ---------- RESET & BASE ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Light mode — refined grayscale palette */
  --bg-page: #f5f5f7;
  --surface: #ffffff;
  --surface-elevated: #fbfbfd;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-muted: #86868b;
  --border-subtle: #d2d2d7;
  --border-soft: #c6c6c8;
  --accent-soft: #1d1d1f;
  --accent-hover: #000000;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02), 0 4px 8px rgba(0, 0, 0, 0.02);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.04), 0 8px 16px rgba(0, 0, 0, 0.04);
  --shadow-float: 0 12px 24px -8px rgba(0, 0, 0, 0.08);
  --button-text: #ffffff;
  --transition: all 0.2s cubic-bezier(0.33, 1, 0.68, 1);
  --radius-card: 18px;
  --radius-element: 980px;
}

body.dark {
  /* Dark mode — refined dark grays */
  --bg-page: #1a1a1c;
  --surface: #2d2d2f;
  --surface-elevated: #333335;
  --text-primary: #f5f5f7;
  --text-secondary: #c0c0c6;
  --text-muted: #98989e;
  --border-subtle: #424245;
  --border-soft: #555558;
  --accent-soft: #f5f5f7;
  --accent-hover: #ffffff;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.15);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-float: 0 12px 24px -8px rgba(0, 0, 0, 0.3);
  --button-text: #1d1d1f;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.page-wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 2.5rem;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ---------- HEADER ---------- */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0 1.5rem 0;
  margin-bottom: 2rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

nav {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 400;
  padding: 0.4rem 0;
  transition: var(--transition);
  cursor: pointer;
  opacity: 0.7;
}

.nav-link:hover {
  color: var(--accent-soft);
  transform: translateY(-1px);
  opacity: 1;
}

.nav-link.active {
  color: var(--text-primary);
  font-weight: 500;
  opacity: 1;
}

.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  margin-left: 0.5rem;
}

.theme-toggle:hover {
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* ---------- MAIN & SECTIONS ---------- */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section {
  display: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.section.active {
  display: block;
  opacity: 1;
}

/* ---------- HOME SECTION ---------- */
#home.active {
  display: flex;
  align-items: center;
  gap: 5rem;
  min-height: 520px;
  padding: 1rem 0;
}

.content {
  flex: 1.2;
}

.greeting {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 400;
}

h1 {
  font-size: 3.5rem;
  font-weight: 580;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.bio {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 2.2rem;
  font-weight: 400;
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.contact-button {
  background: var(--accent-soft);
  color: var(--button-text);
  border: none;
  padding: 0.8rem 2.2rem;
  border-radius: var(--radius-element);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.contact-button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}

body.dark .contact-button {
  color: #1d1d1f;
}

.social-icons {
  display: flex;
  gap: 1.8rem;
}

.social-icons a {
  color: var(--text-secondary);
  font-size: 1.6rem;
  transition: var(--transition);
}

.social-icons a:hover {
  color: var(--accent-soft);
  transform: translateY(-1px);
}

.profile-image {
  flex: 0.9;
  display: flex;
  justify-content: center;
}

.profile-image img {
  width: 100%;
  max-width: 380px;
  height: auto;
  aspect-ratio: 1/1;
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
  object-fit: cover;
  box-shadow: var(--shadow-float);
  border: 1px solid var(--border-subtle);
}

/* ---------- PORTFOLIO SECTION ---------- */
#portfolio.active {
  display: block;
  padding: 0.5rem 0 2rem;
}

.portfolio-content {
  max-width: 1300px;
  margin: 0 auto;
  width: 100%;
}

.portfolio-content h2 {
  font-size: 2.2rem;
  font-weight: 550;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.portfolio-subtitle {
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-size: 1rem;
}

.portfolio-items {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
  margin-bottom: 3rem;
}

/* Cards */
.portfolio-card {
  background: var(--surface);
  border-radius: var(--radius-card);
  padding: 1.8rem 1.8rem 2rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 540px;
}

.portfolio-card:hover {
  box-shadow: var(--shadow-float);
  transform: translateY(-3px);
  border-color: var(--border-soft);
}

.portfolio-content-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.portfolio-meta {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 1rem;
  font-size: 0.75rem;
  align-items: center;
}

.portfolio-category {
  background: var(--bg-page);
  padding: 0.25rem 1rem;
  border-radius: var(--radius-element);
  color: var(--text-secondary);
  font-weight: 450;
  border: 1px solid var(--border-subtle);
}

.portfolio-date-text {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.portfolio-card h3 {
  font-size: 1.5rem;
  font-weight: 520;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

/* Preview area */
.card-preview, .pocket-gym-preview {
  margin: 0.75rem 0 1rem;
  border-radius: 14px;
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  padding: 1rem;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.02);
}

.pocket-gym-preview {
  background: #f9f9fb;
  border-radius: 16px 16px 16px 8px;
  padding: 0.9rem;
  font-family: 'Inter', sans-serif;
  color: #1d1d1f;
  border: 1px solid #d9d9de;
}

body.dark .pocket-gym-preview {
  background: #2a2a2c;
  border-color: #4a4a4e;
  color: #eaeaea;
}

.gym-mini-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.gym-mini-exercise {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  padding: 0.15rem 0;
}

.gym-mini-sets {
  background: rgba(0,0,0,0.04);
  padding: 0.1rem 0.5rem;
  border-radius: 20px;
}

body.dark .gym-mini-sets {
  background: #404044;
}

.portfolio-excerpt {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0.9rem 0 1.2rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.portfolio-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.portfolio-author {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
}

.view-project {
  color: var(--accent-soft);
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
  padding: 0.3rem 0.6rem;
  border-radius: 20px;
  background: transparent;
}

.view-project:hover {
  gap: 8px;
  background: rgba(0, 0, 0, 0.03);
  color: var(--accent-hover);
}

body.dark .view-project:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* footer */
.footer {
  text-align: center;
  padding: 2.5rem 0 1rem;
  margin-top: 2.5rem;
  color: var(--text-muted);
}

/* modal */
.modal {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
}

.modal.active {
  display: block;
}

.modal-content {
  background: var(--surface-elevated);
  backdrop-filter: blur(10px);
  padding: 2rem;
  border-radius: 24px;
  width: 360px;
  box-shadow: var(--shadow-float);
  border: 1px solid var(--border-subtle);
  animation: floatIn 0.2s ease;
}

@keyframes floatIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.close-modal {
  float: right;
  font-size: 1.6rem;
  cursor: pointer;
  color: var(--text-muted);
}

.submit-btn {
  background: var(--accent-soft);
  color: var(--button-text);
  border: none;
  padding: 0.8rem;
  border-radius: var(--radius-element);
  width: 100%;
  font-weight: 500;
  transition: var(--transition);
}

.submit-btn:hover {
  background: var(--accent-hover);
}

body.dark .submit-btn {
  color: #1d1d1f;
}

/* responsive */
@media (max-width: 1000px) {
  .portfolio-items { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 700px) {
  .page-wrapper { padding: 1.5rem; }
  #home.active { flex-direction: column-reverse; text-align: center; gap: 2rem; }
  .portfolio-items { grid-template-columns: 1fr; }
  nav { gap: 1.5rem; }
  h1 { font-size: 2.8rem; }
}