/* ==============================
   CSS CUSTOM PROPERTIES — THEMES
   ============================== */

/* ---- Dark Theme (default) ---- */
:root {
  --bg-primary: #0A0A0A;
  --bg-secondary: #111111;
  --bg-tertiary: #1A1A1A;
  --border-color: #222222;
  --text-primary: #FFFFFF;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;
  --accent: #3B82F6;
  --accent-hover: #2563EB;
  --accent-rgb: 59, 130, 246;
  --card-bg: #151515;
  --card-shadow: 0 1px 0 #222222;
  --card-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.3);
  --navbar-bg: rgba(10, 10, 10, 0.85);
  --navbar-shadow: 0 1px 0 #222222;
  --hero-badge-bg: rgba(59, 130, 246, 0.15);
  --hero-badge-border: rgba(59, 130, 246, 0.25);
  --btn-outline-hover-bg: rgba(255, 255, 255, 0.05);
  --btn-outline-hover-border: rgba(255, 255, 255, 0.2);
  --hover-border: rgba(59, 130, 246, 0.3);
  --hover-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  --timeline-dot-bg: #0A0A0A;
  --tech-tag-bg: rgba(59, 130, 246, 0.1);
  --tech-tag-border: rgba(59, 130, 246, 0.2);
  --social-bg: rgba(59, 130, 246, 0.1);
  --accent-glow: 0 8px 30px rgba(59, 130, 246, 0.3);
  --selection-text: #FFFFFF;
  --toggler-icon: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.75)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
  --theme-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius: 12px;
  --radius-lg: 16px;
}

/* ---- Light Theme ---- */
[data-theme="light"] {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  --border-color: #E2E8F0;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-rgb: 37, 99, 235;
  --card-bg: #FFFFFF;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 10px 40px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  --navbar-bg: rgba(255, 255, 255, 0.85);
  --navbar-shadow: 0 1px 0 #E2E8F0;
  --hero-badge-bg: rgba(37, 99, 235, 0.08);
  --hero-badge-border: rgba(37, 99, 235, 0.2);
  --btn-outline-hover-bg: rgba(15, 23, 42, 0.05);
  --btn-outline-hover-border: rgba(15, 23, 42, 0.15);
  --hover-border: rgba(37, 99, 235, 0.25);
  --hover-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  --timeline-dot-bg: #FFFFFF;
  --tech-tag-bg: rgba(37, 99, 235, 0.08);
  --tech-tag-border: rgba(37, 99, 235, 0.15);
  --social-bg: rgba(37, 99, 235, 0.08);
  --accent-glow: 0 8px 30px rgba(37, 99, 235, 0.25);
  --selection-text: #FFFFFF;
  --toggler-icon: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(15, 23, 42, 0.75)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ==============================
   THEME TRANSITION
   ============================== */
html {
  transition: background-color var(--theme-transition);
}

*,
*::before,
*::after {
  transition: background-color var(--theme-transition),
              border-color var(--theme-transition),
              color var(--theme-transition),
              box-shadow var(--theme-transition);
}

/* ==============================
   RESET & BASE
   ============================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background-color: var(--accent);
  color: var(--selection-text);
}

/* ==============================
   TYPOGRAPHY
   ============================== */
.accent-text {
  color: var(--accent);
}

.accent-dot {
  color: var(--accent);
  font-size: 1.4em;
  line-height: 0;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-secondary);
}

.section-padding {
  padding: 100px 0;
}

/* ==============================
   NAVBAR
   ============================== */
#mainNav {
  padding: 16px 0;
  background: transparent;
  transition: background var(--theme-transition),
              backdrop-filter var(--theme-transition),
              box-shadow var(--theme-transition);
  z-index: 1050;
}

#mainNav.navbar-scrolled {
  background: var(--navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--navbar-shadow);
}

#mainNav .navbar-brand {
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  transition: color var(--theme-transition);
}

#mainNav .navbar-brand:hover {
  color: var(--accent);
}

#mainNav .nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  transition: color var(--theme-transition);
  position: relative;
}

#mainNav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--theme-transition), background var(--theme-transition);
}

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

#mainNav .nav-link:hover::after,
#mainNav .nav-link.active::after {
  transform: scaleX(1);
}

.navbar-toggler {
  border-color: transparent !important;
  color: var(--text-primary);
  font-size: 1.4rem;
}

.navbar-toggler:focus {
  box-shadow: none;
}

.navbar-toggler-icon {
  background-image: var(--toggler-icon);
}

/* Theme toggle button */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.15rem;
  transition: all var(--theme-transition);
  padding: 0;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--hero-badge-bg);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle i {
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle:hover i {
  transform: rotate(15deg);
}

.theme-toggle .theme-icon-active {
  display: inline;
}

.theme-toggle .theme-icon-inactive {
  display: none;
}

[data-theme="dark"] .theme-toggle .theme-icon-active {
  display: inline;
}

[data-theme="dark"] .theme-toggle .theme-icon-inactive {
  display: none;
}

[data-theme="light"] .theme-toggle .theme-icon-active {
  display: none;
}

[data-theme="light"] .theme-toggle .theme-icon-inactive {
  display: inline;
}

/* ==============================
   HERO SECTION
   ============================== */
.hero-section {
  min-height: 90vh;
  position: relative;
  overflow: hidden;
  padding-top: 100px;
}

.hero-badge {
  background: var(--hero-badge-bg);
  color: var(--accent);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 1px solid var(--hero-badge-border);
  font-size: 0.85rem;
  border-radius: 100px;
}

.hero-title {
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.35rem;
  line-height: 1.4;
  color: var(--text-secondary);
}

.hero-description {
  font-size: 1.1rem;
  max-width: 540px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
  transition: all var(--theme-transition);
  border-radius: var(--radius);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--accent-glow);
}

.btn-outline-light {
  border-color: var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius);
  transition: all var(--theme-transition);
}

.btn-outline-light:hover,
.btn-outline-light:focus {
  background-color: var(--btn-outline-hover-bg);
  border-color: var(--btn-outline-hover-border);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.btn-lg {
  border-radius: var(--radius);
}

/* Hero visual */
.hero-visual {
  padding: 20px;
}

.hero-illustration {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  transition: border-color var(--theme-transition), background var(--theme-transition);
  overflow: hidden;
  padding: 0;
  width: 100%;
}

.hero-illustration:hover {
  border-color: var(--hover-border);
}

/* Code Editor Terminal */
.code-editor {
  background: #1a1b26;
  border-radius: inherit;
  overflow: hidden;
  width: 100%;
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
}

.code-editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: #0f0f1a;
  border-bottom: 1px solid #222;
}

.code-editor-dots {
  display: flex;
  gap: 6px;
}

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

.code-editor-dot.red { background: #ff5f57; }
.code-editor-dot.yellow { background: #ffbd2e; }
.code-editor-dot.green { background: #28c840; }

.code-editor-title {
  color: #565f89;
  font-size: 0.7rem;
  font-family: inherit;
}

.code-editor-body {
  padding: 16px 12px;
  text-align: left;
}

.code-line {
  white-space: pre-wrap;
  word-break: break-word;
  opacity: 0;
  animation: codeFadeIn 0.4s ease forwards;
}

.code-line:nth-child(1) { animation-delay: 0.1s; }
.code-line:nth-child(2) { animation-delay: 0.4s; }
.code-line:nth-child(3) { animation-delay: 0.7s; }
.code-line:nth-child(4) { animation-delay: 1.0s; }
.code-line:nth-child(5) { animation-delay: 1.3s; }
.code-line:nth-child(6) { animation-delay: 1.6s; }
.code-line:nth-child(7) { animation-delay: 1.9s; }

@keyframes codeFadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Syntax colors */
.code-editor .keyword { color: #bb9af7; }
.code-editor .type { color: #7dcfff; }
.code-editor .method { color: #e0af68; }
.code-editor .string { color: #9ece6a; }
.code-editor .comment { color: #565f89; font-style: italic; }
.code-editor .number { color: #ff9e64; }
.code-editor .variable { color: #c0caf5; }
.code-editor .operator { color: #89ddff; }
.code-editor .bracket { color: #f7768e; }

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

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

/* Light theme code editor */
[data-theme="light"] .code-editor {
  background: #f8f9fa;
}

[data-theme="light"] .code-editor-header {
  background: #e9ecef;
  border-bottom-color: #dee2e6;
}

[data-theme="light"] .code-editor-title {
  color: #6c757d;
}

[data-theme="light"] .code-editor .keyword { color: #7c3aed; }
[data-theme="light"] .code-editor .type { color: #0891b2; }
[data-theme="light"] .code-editor .method { color: #d97706; }
[data-theme="light"] .code-editor .string { color: #65a30d; }
[data-theme="light"] .code-editor .comment { color: #94a3b8; }
[data-theme="light"] .code-editor .number { color: #ea580c; }
[data-theme="light"] .code-editor .variable { color: #334155; }
[data-theme="light"] .code-editor .operator { color: #0891b2; }
[data-theme="light"] .code-editor .bracket { color: #dc2626; }

.tech-badges {
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.tech-badge {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all var(--theme-transition);
  box-shadow: var(--card-shadow);
}

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

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
}

.mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-secondary);
  border-radius: 12px;
  position: relative;
  opacity: 0.6;
}

.wheel {
  width: 4px;
  height: 10px;
  background: var(--text-secondary);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollWheel 2s ease-in-out infinite;
}

@keyframes scrollWheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(14px);
  }
}

/* ==============================
   STAT CARD (About)
   ============================== */
.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  transition: all var(--theme-transition);
  box-shadow: var(--card-shadow);
}

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

.stat-number {
  line-height: 1;
  margin-bottom: 0.25rem;
}

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

/* ==============================
   TIMELINE (Experience)
   ============================== */
.bg-secondary-bg {
  background-color: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  padding-left: 64px;
  position: relative;
  margin-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 28px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--timeline-dot-bg);
  border: 3px solid var(--accent);
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-card {
  background: var(--card-bg);
  border-color: var(--border-color) !important;
  transition: all var(--theme-transition);
  box-shadow: var(--card-shadow);
}

.timeline-card:hover {
  border-color: var(--hover-border) !important;
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}

.exp-badge {
  background: var(--hero-badge-bg);
  color: var(--accent);
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  border: 1px solid var(--hero-badge-border);
}

/* ==============================
   PROJECT CARDS
   ============================== */
.project-card {
  background: var(--card-bg);
  border-color: var(--border-color) !important;
  transition: all var(--theme-transition);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

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

.project-image-wrapper {
  width: 100%;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.project-image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-tag {
  background: var(--tech-tag-bg);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid var(--tech-tag-border);
}

/* ==============================
   TECH STACK CARDS
   ============================== */
.stack-card {
  background: var(--card-bg);
  border-color: var(--border-color) !important;
  transition: all var(--theme-transition);
  box-shadow: var(--card-shadow);
}

.stack-card:hover {
  border-color: var(--hover-border) !important;
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

.tech-pill {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 100px;
  border: 1px solid var(--border-color);
  transition: all var(--theme-transition);
}

.tech-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ==============================
   CONTACT CARDS
   ============================== */
.contact-card {
  background: var(--card-bg);
  border-color: var(--border-color) !important;
  transition: all var(--theme-transition);
  box-shadow: var(--card-shadow);
}

.contact-card:hover {
  border-color: var(--hover-border) !important;
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

.contact-card .card-title {
  color: var(--text-primary) !important;
  transition: color var(--theme-transition);
}

.contact-card:hover .card-title {
  color: var(--accent) !important;
}

/* ==============================
   FOOTER
   ============================== */
.footer {
  border-top: none;
}

.footer hr {
  border-color: var(--border-color) !important;
}

.social-link {
  color: var(--text-secondary);
  font-size: 1.3rem;
  transition: all var(--theme-transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid transparent;
}

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

/* ==============================
   SCROLL ANIMATIONS (AOS-like)
   ============================== */
[data-aos] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-aos].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

[data-aos][data-aos-delay="100"] {
  transition-delay: 0.1s;
}

[data-aos][data-aos-delay="150"] {
  transition-delay: 0.15s;
}

[data-aos][data-aos-delay="200"] {
  transition-delay: 0.2s;
}

[data-aos][data-aos-delay="300"] {
  transition-delay: 0.3s;
}

/* ==============================
   REDUCED MOTION
   ============================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-aos] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .wheel {
    animation: none;
  }
}

/* ==============================
   RESPONSIVE
   ============================== */

/* Tablet */
@media (max-width: 991.98px) {
  .section-padding {
    padding: 70px 0;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-visual {
    padding: 0;
  }

  .hero-illustration {
    min-height: 250px;
    padding: 40px 30px;
  }

  .section-title {
    font-size: 1.9rem;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item {
    padding-left: 56px;
  }

  .timeline-item::before {
    left: 12px;
  }
}

/* Mobile */
@media (max-width: 575.98px) {
  .section-padding {
    padding: 50px 0;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .hero-illustration {
    min-height: 200px;
    padding: 30px 20px;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .timeline::before {
    left: 16px;
  }

  .timeline-item {
    padding-left: 48px;
  }

  .timeline-item::before {
    left: 8px;
    width: 16px;
    height: 16px;
  }
}

/* Landscape phone */
@media (max-width: 767.98px) and (orientation: landscape) {
  .hero-section {
    min-height: auto;
    padding: 120px 0 80px;
  }
}