/* ===== Variables ===== */
:root {
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-surface: #334155;
  --color-text: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-accent: #38bdf8;
  --color-accent-hover: #7dd3fc;
  --color-border: rgba(255, 255, 255, 0.08);
  --font: "Plus Jakarta Sans", system-ui, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.35);
  --transition: 0.25s ease;
}

/* ===== Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* ===== Scroll progress ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), #0ea5e9);
  z-index: 1000;
  transition: width 0.08s ease-out;
}

/* ===== Header & Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
  background: rgba(56, 189, 248, 0.1);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  border-radius: 8px;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  content: "";
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: var(--transition);
}

.nav-toggle::before {
  margin-bottom: 5px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
}

.nav-toggle.is-open::before {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open::after {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-toggle.is-open span {
  opacity: 0;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(56, 189, 248, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(30, 58, 138, 0.2), transparent),
    radial-gradient(ellipse 60% 40% at 0% 80%, rgba(30, 58, 138, 0.15), transparent);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 560px;
  position: relative;
}

.profile-photo-wrap {
  margin-bottom: 1.5rem;
}

.profile-photo-frame {
  width: 140px;
  height: 140px;
  margin: 0 auto;
  padding: 4px;
  background: linear-gradient(145deg, var(--color-accent), #0ea5e9);
  border-radius: 50%;
  box-shadow: var(--shadow), 0 0 0 4px rgba(56, 189, 248, 0.2);
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  filter: brightness(1.02) contrast(1.02);
}

.hero-name {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.02em;
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-accent);
  margin: 0 0 1rem 0;
  min-height: 1.75em;
  font-weight: 600;
}

.typing-cursor {
  display: inline-block;
  color: var(--color-accent);
  animation: blink 0.8s step-end infinite;
  margin-left: 2px;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-intro {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.7;
}

/* ===== Sections ===== */
.section {
  padding: 4rem 1.5rem;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin: 0 0 2rem 0;
}

/* ===== About ===== */
.about-content {
  margin-top: 1rem;
}

.about-text {
  color: var(--color-text-muted);
  margin: 0 0 1.5rem 0;
  max-width: 60ch;
}

.about-details {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.about-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.about-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.about-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.about-card p {
  margin: 0;
  color: var(--color-text);
  font-size: 0.95rem;
}

/* ===== Skills ===== */
.skill-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  margin-top: 1rem;
}

.skill-category {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.skill-category:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.skill-category-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-category-title i {
  font-size: 1.1rem;
}

.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
}

.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  transition: background var(--transition), border-color var(--transition);
}

.skill-badge i {
  font-size: 1rem;
  opacity: 0.9;
}

.skill-badge::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 0 2px 0 0;
}

.skill-badge[data-level="advanced"]::after {
  width: 100%;
}

.skill-badge[data-level="proficient"]::after {
  width: 85%;
}

.skill-badge:hover {
  background: var(--color-bg);
  border-color: rgba(56, 189, 248, 0.3);
}

/* ===== Projects ===== */
.projects {
  background: var(--color-bg-alt);
}

.project-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  margin-top: 1rem;
}

.project-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.project-image {
  height: 180px;
  background-size: cover;
  background-position: center;
}

.project-image-1 {
  background: linear-gradient(135deg, #0ea5e9 0%, #0369a1 50%, #0c4a6e 100%);
}

.project-image-2 {
  background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 50%, #4c1d95 100%);
}

.project-image-3 {
  background: linear-gradient(135deg, #10b981 0%, #059669 50%, #047857 100%);
}

.project-body {
  padding: 1.25rem 1.5rem;
}

.project-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
}

.project-body p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0 0 1rem 0;
  line-height: 1.5;
}

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

.project-tech span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(56, 189, 248, 0.15);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
}

/* ===== Contact ===== */
.contact-content {
  text-align: center;
  max-width: 400px;
  margin: 0 auto;
}

.contact-email {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  margin-bottom: 1.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}

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

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.contact-link i {
  font-size: 1.4rem;
}

.contact-link:hover {
  color: var(--color-accent);
  background: rgba(56, 189, 248, 0.1);
  border-color: var(--color-accent);
}

/* ===== Footer ===== */
.site-footer {
  padding: 1.5rem 1.5rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== Scroll animations ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive: tablet ===== */
@media (min-width: 768px) {
  .section {
    padding: 5rem 2rem;
  }

  .hero {
    padding: 7rem 2rem 5rem;
  }

  .profile-photo-frame {
    width: 160px;
    height: 160px;
  }
}

/* ===== Responsive: mobile nav ===== */
@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .nav-toggle::before,
  .nav-toggle::after {
    content: "";
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
  }

  .nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

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

  .nav-links a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 8px;
  }
}