/* ---------- Base & Variables ---------- */
:root {
  --color-bg: #0f1220;
  --color-bg-alt: #161a2e;
  --color-surface: #1c2138;
  --color-primary: #6c5ce7;
  --color-primary-light: #a29bfe;
  --color-accent: #00d3a7;
  --color-text: #e8e9f3;
  --color-text-muted: #a4a8c3;
  --color-border: #2a2f4c;
  --radius: 12px;
  --max-width: 1100px;
  --transition: 0.25s ease;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: 0.5rem;
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 3rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
  font-size: 1rem;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

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

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 18, 32, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

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

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

.nav-link {
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 20px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

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

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(108, 92, 231, 0.25), transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(0, 211, 167, 0.15), transparent 40%);
}

.hero-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.eyebrow {
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff, var(--color-primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- About ---------- */
.about-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.skill-tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text);
}

.about-stats {
  display: grid;
  gap: 1rem;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
}

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

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow);
}

.project-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.project-card h3 {
  margin-bottom: 0.5rem;
}

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

/* ---------- Contact ---------- */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  color: var(--color-text);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
}

.form-group.invalid input,
.form-group.invalid textarea {
  border-color: #ff6b6b;
}

.error-message {
  color: #ff6b6b;
  font-size: 0.8rem;
  min-height: 1em;
}

.form-success {
  color: var(--color-accent);
  font-weight: 600;
  text-align: center;
  min-height: 1.2em;
}

.contact-form .btn {
  align-self: center;
  min-width: 200px;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.social-links {
  display: flex;
  gap: 1.25rem;
}

.social-links a:hover {
  color: var(--color-text);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: center;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
  }

  .nav-links.open {
    max-height: 300px;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 1rem;
  }

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

  .hero {
    min-height: 80vh;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 3.5rem 0;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
}