/* ===== Custom Properties ===== */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #e2e8f0;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent: #0284c7;
  --accent-hover: #0369a1;
  --border: #cbd5e1;
  --shadow: rgba(0, 0, 0, 0.1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: 'Raleway', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  line-height: 1.6;
}

/* ===== Navbar ===== */
.navbar {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  transition: background-color 0.3s ease, border-color 0.3s ease;
  z-index: 1000;
}

.navbar.scrolled {
  box-shadow: 0 4px 20px var(--shadow);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width 0.3s ease;
}

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

.nav-link.active::after,
.nav-link:hover::after {
  width: 100%;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(56, 189, 248, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
  z-index: 0;
}

.grid-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.3;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* Profile Photo */
.profile-photo {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--accent);
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.15);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.profile-photo:hover {
  box-shadow: 0 0 40px rgba(56, 189, 248, 0.25);
}

@media (max-width: 768px) {
  .profile-photo {
    width: 200px;
    height: 200px;
  }
}

/* Typing cursor */
.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1.1em;
  background-color: var(--accent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ===== Section Styles ===== */
section {
  padding: 5rem 0;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.section-subtitle {
  color: var(--text-secondary);
  margin-bottom: 3rem;
  font-size: 1.05rem;
}

.section-line {
  width: 3rem;
  height: 3px;
  background-color: var(--accent);
  margin-bottom: 1.5rem;
  border-radius: 2px;
}

/* ===== Cards ===== */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  transform: translateY(-10px) scale(1.03) !important;
  box-shadow: 0 24px 60px var(--shadow) !important;
  border-color: var(--accent) !important;
}

.card-image {
  width: 100%;
  height: 200px;
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.05), rgba(99, 102, 241, 0.05));
}

.tech-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
  background-color: var(--bg-secondary);
  color: var(--accent);
  border: 1px solid var(--border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* ===== Skill Tags ===== */
.skill-category {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.skill-category:hover {
  border-color: var(--accent);
}

.skill-tag {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border-radius: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent);
  color: #0f172a;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background-color: transparent;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ===== Icon Buttons ===== */
.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
  text-decoration: none;
}

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

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}


.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== Theme Toggle ===== */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ===== Mobile Menu ===== */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

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

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

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

.mobile-menu {
  display: none;
  position: fixed;
  top: 4rem;
  left: 0;
  right: 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  z-index: 999;
  transform: translateY(-100%);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .desktop-nav {
    display: none;
  }

  .mobile-menu {
    display: block;
  }
}

/* ===== Footer ===== */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* ===== Contact Form ===== */
.contact-input {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: 'Raleway', sans-serif;
  font-size: 0.9rem;
  width: 100%;
  transition: border-color 0.2s ease;
  outline: none;
}

.contact-input:focus {
  border-color: var(--accent);
}

.contact-input::placeholder {
  color: var(--text-secondary);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* ===== Selection ===== */
::selection {
  background-color: var(--accent);
  color: var(--bg-primary);
}