/* -----------------------------------------
   THEME VARIABLES
----------------------------------------- */
:root {
  --bg: #f9fafb;
  --bg-alt: #e5e7eb;
  --text: #111827;
  --muted: #4b5563;
  --header-bg: #020617;
  --card-bg: #ffffff;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --border-subtle: #e5e7eb;
  --shadow-soft: 0 1px 4px rgba(0, 0, 0, 0.08);
  --shadow-strong: 0 10px 30px rgba(15, 23, 42, 0.25);
}

body[data-theme="dark"] {
  --bg: #020617;
  --bg-alt: #0f172a;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --header-bg: #020617;
  --card-bg: #020617;
  --accent: #60a5fa;
  --accent-dark: #3b82f6;
  --border-subtle: #1f2937;
  --shadow-soft: 0 1px 4px rgba(0, 0, 0, 0.7);
  --shadow-strong: 0 18px 45px rgba(0, 0, 0, 0.9);
}

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

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* -----------------------------------------
   HEADER (animated background)
----------------------------------------- */
.site-header {
  background-color: var(--header-bg);
  color: #f9fafb;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
  overflow: hidden;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: -50%;
  background:
    radial-gradient(circle at 0% 0%, #2563eb40, transparent 55%),
    radial-gradient(circle at 100% 0%, #22c55e40, transparent 55%),
    radial-gradient(circle at 100% 100%, #f9731640, transparent 55%);
  opacity: 0.7;
  animation: headerGlow 16s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes headerGlow {
  0% { transform: translate3d(-5%, -5%, 0) scale(1); }
  50% { transform: translate3d(5%, -10%, 0) scale(1.1); }
  100% { transform: translate3d(-3%, 5%, 0) scale(1.05); }
}

.header-content {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.6rem;
  font-weight: 700;
}

.site-subtitle {
  font-size: 0.95rem;
  opacity: 0.85;
}

/* NAV & TOGGLES */
.site-header nav {
  display: flex;
  align-items: center;
}

.site-header nav a {
  margin-left: 1rem;
  color: #e5e7eb;
  text-decoration: none;
  font-size: 0.95rem;
}

.site-header nav a:hover {
  text-decoration: underline;
}

.theme-toggle,
.lang-toggle {
  margin-left: 1rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.7);
  color: #e5e7eb;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s ease, transform 0.12s ease,
    box-shadow 0.2s ease;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
}

.lang-toggle {
  background: rgba(15, 23, 42, 0.0);
}

.theme-toggle:hover,
.lang-toggle:hover {
  background: rgba(15, 23, 42, 0.95);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
}

/* -----------------------------------------
   HERO
----------------------------------------- */
.hero {
  padding: 3.5rem 0;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 0%, #2563eb10, transparent 55%),
    radial-gradient(circle at 90% 100%, #22c55e10, transparent 55%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  gap: 2.25rem;
}

.hero h2 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.hero p {
  color: var(--muted);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* Avatar & Quick info card */
.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto 1rem auto;
  border: 2px solid var(--border-subtle);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease;
}

.avatar:hover {
  transform: scale(1.04);
}

.hero-card {
  background-color: #020617;
  color: #f9fafb;
  padding: 1.6rem;
  border-radius: 1rem;
  text-align: center;
  box-shadow: var(--shadow-strong);
}

/* -----------------------------------------
   BUTTONS
----------------------------------------- */
.btn {
  padding: 0.6rem 1.35rem;
  border-radius: 999px;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: 0.2s ease;
  cursor: pointer;
}

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

.btn.primary:hover {
  background-color: var(--accent-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-strong);
}

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

body[data-theme="dark"] .btn.outline {
  border-color: #e5e7eb;
  color: #e5e7eb;
}

.btn.outline:hover {
  background-color: var(--text);
  color: #ffffff;
  transform: translateY(-1px);
}

/* -----------------------------------------
   SECTIONS
----------------------------------------- */
.section {
  padding: 3.25rem 0;
}

.section-alt {
  padding: 3.25rem 0;
  background-color: var(--bg-alt);
}

.section h2 {
  margin-bottom: 1.1rem;
}

/* Small intro text used on projects page */
.page-intro {
  max-width: 700px;
  margin-bottom: 1.5rem;
  color: var(--muted);
}

/* -----------------------------------------
   GRIDS
----------------------------------------- */
.grid-3 {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  display: grid;
  gap: 1.8rem;
}

/* -----------------------------------------
   CARDS
----------------------------------------- */
.card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 1.6rem;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border-subtle);
  transition: transform 0.18s ease, box-shadow 0.2s ease,
    border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-strong);
  border-color: rgba(37, 99, 235, 0.35);
}

.card h3 {
  margin-bottom: 0.55rem;
}

.card ul {
  margin-left: 1rem;
}

.card li {
  margin-bottom: 0.25rem;
}

/* Tagline under project titles */
.tagline {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

/* -----------------------------------------
   ABOUT
----------------------------------------- */
.about-grid {
  display: grid;
  gap: 1.6rem;
}

/* -----------------------------------------
   PROJECTS
----------------------------------------- */
.project-list {
  display: grid;
  gap: 1.6rem;
}

.project-card h3 {
  margin-bottom: 0.4rem;
}

.project-meta {
  list-style: none;
  margin-top: 0.75rem;
}

.project-meta li {
  color: var(--muted);
  font-size: 0.9rem;
}

/* -----------------------------------------
   CONTACT
----------------------------------------- */
.contact-list {
  margin-top: 1rem;
  list-style: none;
}

.contact-list li {
  margin-bottom: 0.5rem;
}

/* -----------------------------------------
   LINKS
----------------------------------------- */
a {
  color: var(--accent);
}

a.link {
  font-weight: 500;
}

a.link:hover {
  text-decoration: underline;
}

/* -----------------------------------------
   FOOTER
----------------------------------------- */
.site-footer {
  background-color: var(--header-bg);
  color: #e5e7eb;
  text-align: center;
  padding: 1.1rem 0;
  margin-top: 2.25rem;
  font-size: 0.9rem;
}

/* -----------------------------------------
   SCROLL REVEAL ANIMATIONS
----------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* -----------------------------------------
   DESKTOP LAYOUT
----------------------------------------- */
@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 2fr 1fr;
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* -----------------------------------------
   MOBILE LAYOUT (HEADER FIX)
----------------------------------------- */
@media (max-width: 767px) {
  .site-header {
    padding: 0.6rem 0;
  }

  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .site-title {
    font-size: 1.3rem;
  }

  .site-subtitle {
    font-size: 0.8rem;
  }

  .site-header nav {
    width: 100%;
    margin-top: 0.25rem;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .site-header nav a {
    margin-left: 0;
    margin-right: 0.75rem;
    font-size: 0.9rem;
  }

  .theme-toggle,
  .lang-toggle {
    margin-left: 0;
    margin-right: 0.35rem;
    padding: 0.2rem 0.55rem;
    font-size: 0.8rem;
  }

  .hero {
    padding-top: 2.25rem;
  }

  .hero h2 {
    font-size: 1.6rem;
  }
}