/* ===========================
   BTOP-INSPIRED PORTFOLIO
   TUI / Terminal Dashboard Aesthetic
   Light + Dark Theme Toggle
=========================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;0,600;1,300&family=IBM+Plex+Sans:wght@300;400;500&display=swap');

/* ===========================
   CSS VARIABLES — DARK (DEFAULT)
=========================== */
:root {
  --bg:        #0e1117;
  --bg2:       #161b22;
  --bg3:       #1c2333;
  --border:    #30363d;
  --border-hi: #58a6ff;
  --text:      #c9d1d9;
  --text-dim:  #8b949e;
  --text-hi:   #f0f6fc;
  --accent:    #58a6ff;   /* btop blue */
  --accent2:   #3fb950;   /* btop green */
  --accent3:   #d2a8ff;   /* btop purple */
  --accent4:   #ffa657;   /* btop orange */
  --red:       #f85149;
  --panel-shadow: 0 0 0 1px var(--border);
  --glow: 0 0 12px rgba(88, 166, 255, 0.15);
}

/* ===========================
   LIGHT THEME
=========================== */
body.light {
  --bg:        #f6f8fa;
  --bg2:       #ffffff;
  --bg3:       #eaeef2;
  --border:    #d0d7de;
  --border-hi: #0969da;
  --text:      #24292f;
  --text-dim:  #57606a;
  --text-hi:   #0d1117;
  --accent:    #0969da;
  --accent2:   #1a7f37;
  --accent3:   #8250df;
  --accent4:   #bc4c00;
  --red:       #cf222e;
  --panel-shadow: 0 1px 3px rgba(0,0,0,0.12);
  --glow: 0 0 12px rgba(9, 105, 218, 0.08);
}

/* ===========================
   RESET + BASE
=========================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.25s ease, color 0.25s ease;
  font-size: 14px;
}

/* Subtle grid background */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.25;
  pointer-events: none;
  z-index: 0;
}

/* ===========================
   BTOP PANEL MIXIN
=========================== */
.panel {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: var(--panel-shadow);
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.panel:hover {
  border-color: var(--border-hi);
  box-shadow: var(--glow);
}

/* Panel title bar — btop style */
.panel-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-title::before {
  content: "┌─";
  color: var(--border-hi);
  font-size: 0.75rem;
}

.panel-body {
  padding: 20px;
}

/* ===========================
   NAVBAR
=========================== */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 32px;
  height: 52px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.logo span {
  color: var(--text-dim);
  font-weight: 300;
}

nav ul {
  display: flex;
  gap: 4px;
  list-style: none;
}

nav ul li a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: all 0.15s;
  letter-spacing: 0.03em;
}

nav ul li a:hover {
  color: var(--accent);
  border-color: var(--border);
  background: var(--bg3);
}

/* Theme toggle */
#theme-toggle {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.05em;
}

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

/* ===========================
   HERO — btop "top bar" style
=========================== */
.hero {
  padding: 80px 40px 60px;
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-inner {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg2);
  overflow: hidden;
}

/* Top bar mimics btop header */
.hero-bar {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.hero-bar .bar-left {
  display: flex;
  gap: 6px;
  align-items: center;
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red   { background: var(--red); }
.dot.green { background: var(--accent2); }
.dot.blue  { background: var(--accent); }

.hero-content {
  padding: 40px 36px;
}

.hero-prompt {
  font-size: 0.75rem;
  color: var(--accent2);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--text-hi);
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.hero h1 .cursor {
  display: inline-block;
  width: 3px;
  height: 2.2rem;
  background: var(--accent);
  vertical-align: middle;
  margin-left: 4px;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.tagline {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 28px;
  letter-spacing: 0.02em;
}

.tagline .sep { color: var(--border-hi); margin: 0 6px; }

.hero-actions {
  display: flex;
  gap: 10px;
}

.btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  padding: 8px 18px;
  border-radius: 4px;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text);
  transition: all 0.15s;
  letter-spacing: 0.03em;
  cursor: pointer;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg2);
}

.btn.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 500;
}

.btn.primary:hover {
  opacity: 0.85;
  color: var(--bg);
}

/* ===========================
   MAIN LAYOUT
=========================== */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px 80px;
  position: relative;
  z-index: 1;
}

section {
  margin-bottom: 60px;
}

/* Section header */
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.section-header h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
}

.section-header::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===========================
   ABOUT
=========================== */
#about .panel-body p {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.8;
  max-width: 720px;
}

#about .panel-body p + p {
  margin-top: 14px;
}

/* ===========================
   SKILLS — btop meter style
=========================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}

.skill-category-row {
  grid-column: 1 / -1;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent3);
  padding: 12px 0 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}

.skill {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 14px;
  font-size: 0.78rem;
  color: var(--text);
  transition: all 0.15s;
  cursor: default;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill::before {
  content: "▸";
  color: var(--accent2);
  font-size: 0.65rem;
}

.skill:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg2);
}

/* ===========================
   PROJECT CARDS
=========================== */
.project-category-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 40px 0 16px;
}

.project-category-header h3 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent4);
  font-weight: 500;
}

.project-category-header::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.card:hover {
  border-color: var(--border-hi);
  box-shadow: var(--glow);
}

.card-header {
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-header i {
  color: var(--accent);
  font-size: 0.85rem;
  width: 16px;
}

.card-header h3 {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-hi);
  letter-spacing: 0.02em;
}

.card-body {
  padding: 14px 16px;
}

.card-body p {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 12px;
}

.placeholder-img {
  width: 100%;
  height: 120px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

/* Scanlines — subtle */
.placeholder-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(255,255,255,0.015) 3px,
    rgba(255,255,255,0.015) 4px
  );
  pointer-events: none;
}

.placeholder-img i {
  font-size: 2rem;
  color: var(--border-hi);
  opacity: 0.5;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tags span {
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.project-link {
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: opacity 0.15s;
}

.project-link::before { content: "→ "; }

.project-link:hover { opacity: 0.75; }

/* ===========================
   CERTIFICATIONS
=========================== */
#certifications .panel-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#certifications .panel-body li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text);
  padding: 10px 14px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 0.15s;
}

#certifications .panel-body li:hover {
  border-color: var(--accent2);
}

#certifications .panel-body li::before {
  content: "✓";
  color: var(--accent2);
  font-size: 0.75rem;
  min-width: 14px;
}

#certifications .panel-body li strong {
  color: var(--text-hi);
}

/* In-progress badge */
.badge {
  font-size: 0.65rem;
  padding: 2px 7px;
  border-radius: 10px;
  background: rgba(255, 166, 87, 0.15);
  border: 1px solid var(--accent4);
  color: var(--accent4);
  margin-left: auto;
  letter-spacing: 0.05em;
}

/* ===========================
   CONTACT
=========================== */
#contact .panel-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#contact .panel-body p {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  padding: 10px 14px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 0.15s;
}

#contact .panel-body p:hover {
  border-color: var(--accent);
}

#contact .panel-body p i {
  color: var(--accent);
  width: 16px;
  text-align: center;
}

#contact .panel-body a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.15s;
}

#contact .panel-body a:hover {
  color: var(--accent);
}

/* ===========================
   FLOATING CONTACT
=========================== */
.contact-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--accent);
  color: var(--bg) !important;
  width: 42px;
  height: 42px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  text-decoration: none;
  border: 1px solid var(--accent);
  transition: opacity 0.15s, transform 0.15s;
  z-index: 999;
}

.contact-float:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

/* ===========================
   FOOTER
=========================== */
footer {
  border-top: 1px solid var(--border);
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  color: var(--text-dim);
  position: relative;
  z-index: 1;
}

footer a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: 14px;
  transition: color 0.15s;
}

footer a:hover {
  color: var(--accent);
}

/* ===========================
   AOS overrides
=========================== */
[data-aos] { transition-duration: 400ms !important; }

/* ===========================
   SCROLLBAR
=========================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hi); }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 768px) {
  nav { padding: 0 16px; }
  nav ul { display: none; }
  .hero { padding: 40px 16px; }
  main { padding: 0 16px 60px; }
  .hero h1 { font-size: 1.7rem; }
  .project-grid { grid-template-columns: 1fr; }
  footer { flex-direction: column; gap: 8px; text-align: center; }
}