/* =============================
   CSS Variables & Reset
   ============================= */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --accent: #f59e0b;
  --bg: #ffffff;
  --surface: #f8fafc;
  --text: #0f172a;
  --text-muted: #64748b;
  --white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --max-width: 1100px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto;
}

.btn {
  display: inline-block;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-family: inherit;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
  max-width: none;
}

/* =============================
   Header / Nav
   ============================= */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.nav-logo span {
  color: var(--primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

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

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

/* =============================
   Hero
   ============================= */
.hero {
  padding: 6rem 0 8rem;
  text-align: center;
  background: linear-gradient(135deg, var(--surface) 0%, var(--white) 100%);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -1px;
}

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

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
/* =============================
   About
   ============================= */
.about {
  padding: 5rem 0;
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.placeholder-img {
  width: 100%;
  height: 350px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 500;
}

.about-text h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.about-list {
  list-style: none;
  margin: 1.5rem 0;
}

.about-list li {
  margin-bottom: 0.75rem;
  font-size: 1rem;
  color: var(--text);
}

.about-list .check {
  color: var(--primary);
  margin-right: 0.5rem;
  font-weight: bold;
}

.about-note {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 1rem;
}

/* =============================
   Services
   ============================= */
.services {
  padding: 5rem 0;
  background: var(--surface);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.service-card {
  background: var(--white);
  padding: 2.5rem 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--primary);
}

.service-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
  display: inline-block;
}

.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.service-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* =============================
   Portfolio
   ============================= */
.portfolio {
  padding: 5rem 0;
  background: var(--white);
}

.portfolio-filters {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.6rem 1.25rem;
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-btn.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.project-preview {
  height: 200px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.preview-bar {
  display: flex;
  gap: 6px;
  padding: 8px 12px;
  background: #e2e8f0;
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.preview-dot.red {
  background: #ff5f56;
}

.preview-dot.yellow {
  background: #ffbd2e;
}

.preview-dot.green {
  background: #27c93f;
}

.preview-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--text-muted);
  padding: 1rem;
}

.preview-emoji {
  font-size: 2.5rem;
}

.preview-url {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--secondary);
}

.project-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

.project-content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.project-content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  flex: 1;
}

.project-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.project-tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  background: var(--surface);
  color: var(--secondary);
  border-radius: 20px;
}

.project-links {
  display: flex;
  gap: 0.75rem;
}

.project-links a {
  flex: 1;
  text-align: center;
  padding: 0.7rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  transition: var(--transition);
}

.project-links .live {
  background: var(--primary);
  color: var(--white);
}

.project-links .live:hover {
  background: var(--primary-dark);
}

.project-links .github {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.project-links .github:hover {
  background: var(--border);
}

/* =============================
   Contact
   ============================= */
.contact {
  padding: 5rem 0;
  background: var(--surface);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-icon {
  font-size: 1.5rem;
}

.contact-item div strong {
  display: block;
  font-size: 0.9rem;
  color: var(--secondary);
  margin-bottom: 0.25rem;
}

.contact-item div a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.contact-item div a:hover {
  color: var(--primary);
}

.contact-form {
  background: var(--white);
  padding: 2.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
  background: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-message {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  min-height: 1.2rem;
}

.form-message.success {
  color: #16a34a;
}

.form-message.error {
  color: #dc2626;
}

/* =============================
   Footer
   ============================= */
.footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  background: var(--white);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
}

.footer-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.footer-logo span {
  color: var(--primary);
}

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

.footer-social {
  display: flex;
  gap: 1.5rem;
}

.footer-social a {
  color: var(--secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.footer-social a:hover {
  color: var(--primary);
}

/* =============================
   Animations
   ============================= */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================
   Responsive
   ============================= */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    flex-direction: column;
    background: var(--white);
    border-top: 1px solid var(--border);
    padding: 2rem;
    gap: 1.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: 4rem 0 5rem;
  }

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

  .placeholder-img {
    height: 250px;
  }

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

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

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .section-title h2 {
    font-size: 1.75rem;
  }
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}