/* ============================================================
   CUSTOM PROPERTIES
   ============================================================ */
:root {
  --color-hero:         #0d0d0d;
  --color-dark:         #111111;
  --color-light:        #ffffff;
  --color-gray:         #f5f7fa;
  --color-accent:       #4f8ef7;
  --color-accent-hover: #2d70e8;
  --color-accent-dim:   rgba(79, 142, 247, 0.12);

  --text-dark:          #1a1a1a;
  --text-body:          #4a4a4a;
  --text-muted:         #888888;
  --text-light:         #ffffff;
  --text-light-muted:   rgba(255, 255, 255, 0.65);
  --text-hero-sub:      rgba(255, 255, 255, 0.7);

  --font-heading:       'Raleway', sans-serif;
  --font-body:          'Open Sans', sans-serif;

  --transition:         0.3s ease;
  --container-max:      1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text-body);
  background: var(--color-light);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
}

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

/* ============================================================
   CONTAINER
   ============================================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   NAVBAR
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 48px;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

#navbar.scrolled {
  background: rgba(13, 13, 13, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 18px 48px;
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.35);
}

.navbar-brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 40px;
}

.nav-links a {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: var(--transition);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-radius: 4px;
  transition: all var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(79, 142, 247, 0.45);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.45);
  color: white;
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ============================================================
   SECTION COMMONS
   ============================================================ */
.section {
  padding: 100px 0;
}

.section-light { background: var(--color-light); }
.section-gray  { background: var(--color-gray); }
.section-dark  { background: var(--color-dark); }

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-dark);
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-header.light h2 {
  color: var(--text-light);
}

.section-line {
  width: 48px;
  height: 4px;
  background: var(--color-accent);
  margin: 0 auto 20px;
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.section-subtitle.light,
.section-header.light .section-subtitle {
  color: var(--text-light-muted);
}

/* ============================================================
   HERO
   ============================================================ */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background-color: var(--color-hero);
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(79,142,247,0.09) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 24px;
  animation: fadeInUp 0.9s ease both;
}

.hero-greeting {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 5px;
  margin-bottom: 16px;
}

.hero-name {
  font-size: clamp(3rem, 9vw, 6.5rem);
  font-weight: 800;
  color: white;
  letter-spacing: -3px;
  line-height: 1;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 3vw, 1.875rem);
  font-weight: 300;
  color: var(--text-hero-sub);
  letter-spacing: 3px;
  margin-bottom: 24px;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--text-hero-sub);
  max-width: 460px;
  margin: 0 auto 44px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-hero-sub);
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  cursor: pointer;
  animation: bounceY 2.2s ease-in-out infinite;
  user-select: none;
}

.hero-scroll i {
  font-size: 0.875rem;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text p {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-body);
  margin-bottom: 20px;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.about-tags span {
  padding: 8px 18px;
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border-radius: 100px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 600;
}

/* Code block */
.code-block {
  background: #0d1117;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.18), 0 8px 24px rgba(0,0,0,0.1);
  font-family: 'Courier New', 'Consolas', monospace;
  font-size: 0.9rem;
}

.code-header {
  background: #1c2128;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot.red    { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green  { background: #28c840; }

.code-filename {
  font-size: 0.775rem;
  color: #8b949e;
  margin-left: 8px;
}

.code-body {
  padding: 22px 26px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.code-line {
  display: block;
  line-height: 1.9;
  color: #e6edf3;
}

.code-line .kw   { color: #ff7b72; }
.code-line .str  { color: #a5d6ff; }
.code-line .prop { color: #79c0ff; }

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 80px;
}

.skill-item {
  margin-bottom: 4px;
}

.skill-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.skill-info span {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
}

.skill-bar {
  height: 5px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent) 0%, #7eb8ff 100%);
  border-radius: 3px;
  transition: width 1.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   WORK
   ============================================================ */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.work-card {
  border-radius: 12px;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.work-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.1);
}

.work-card.placeholder {
  border: 2px dashed rgba(79, 142, 247, 0.3);
  background: transparent;
}

.work-card-inner {
  padding: 52px 32px;
  text-align: center;
}

.work-card.placeholder .work-card-inner i {
  font-size: 2.25rem;
  color: var(--color-accent);
  opacity: 0.35;
  display: block;
  margin-bottom: 18px;
}

.work-card.placeholder h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.work-card.placeholder p {
  font-size: 0.875rem;
  color: var(--text-muted);
  opacity: 0.75;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
  color: white;
  transition: color var(--transition);
}

.contact-email:hover {
  color: var(--color-accent);
}

.contact-email i {
  color: var(--color-accent);
  font-size: 1.2rem;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-link {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.65);
  font-size: 1.05rem;
  transition: all var(--transition);
}

.social-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-3px);
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: #080808;
  padding: 28px 24px;
  text-align: center;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  letter-spacing: 1px;
  color: rgba(255, 255, 255, 0.25);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bounceY {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid   { grid-template-columns: 1fr; gap: 48px; }
  .skills-grid  { grid-template-columns: 1fr; }
  .work-grid    { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  #navbar        { padding: 20px 24px; }
  #navbar.scrolled { padding: 14px 24px; }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 72%;
    height: 100vh;
    background: rgba(13,13,13,0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 36px;
    transition: right var(--transition);
    box-shadow: -4px 0 24px rgba(0,0,0,0.4);
  }

  .nav-links.open { right: 0; }
  .nav-toggle { display: flex; }

  .section { padding: 72px 0; }
  .section-header { margin-bottom: 44px; }
  .section-header h2 { font-size: 2rem; }

  .work-grid { grid-template-columns: 1fr; }

  .contact-email { font-size: 1rem; }
}