/* ==========================================================================
   Vikas Gupta - Portfolio Stylesheet
   Design Language: Minimalist High-Craft Engineering
   Optimized for High-Resolution Desktop & Mobile Devices
   ========================================================================== */

:root {
  /* Surface & Canvas Tokens */
  --bg-primary: #070a12;
  --bg-secondary: #0b101d;
  --bg-surface: rgba(13, 19, 33, 0.7);
  --bg-surface-hover: rgba(20, 30, 52, 0.85);
  --bg-surface-card: #0c1222;
  --bg-glass-nav: rgba(7, 10, 18, 0.85);

  /* Hairline Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.14);
  --border-focus: rgba(56, 189, 248, 0.5);

  /* Text & Legibility */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* Electric Accents */
  --accent-cyan: #38bdf8;
  --accent-cyan-dark: #0284c7;
  --accent-cyan-glow: rgba(56, 189, 248, 0.22);

  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.22);

  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.22);

  --accent-purple: #818cf8;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;

  /* Geometry */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Animations */
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Reset & Smoothness */
*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: #07090e;
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(ellipse 75% 55% at 50% 0%, rgba(99, 102, 241, 0.22) 0%, rgba(7, 9, 14, 0.95) 70%, #07090e 100%),
    radial-gradient(circle at 90% 65%, rgba(56, 189, 248, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 15% 85%, rgba(16, 185, 129, 0.03) 0%, transparent 45%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

/* Reading Scroll Progress Bar */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8 0%, #818cf8 50%, #10b981 100%);
  z-index: 1200;
  transition: width 0.08s ease-out;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.7);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: #1e293b;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #334155;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.font-mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 10%, #38bdf8 65%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-python {
  background: linear-gradient(135deg, #fbbf24 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Section Containers */
section {
  padding: 85px 0;
  position: relative;
  scroll-margin-top: 80px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 5px 14px;
  border-radius: 9999px;
  margin-bottom: 14px;
}

.section-tag.amber {
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.25);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.2;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 620px;
  margin: 0 auto 45px auto;
  line-height: 1.6;
}

/* ==========================================================================
   NAVIGATION BAR
   ========================================================================== */
.navbar-custom {
  background: var(--bg-glass-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 0;
  transition: var(--transition-smooth);
}

.navbar-custom.scrolled {
  background: rgba(7, 10, 18, 0.96);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  padding: 10px 0;
}

.navbar-brand-logo {
  font-weight: 700;
  font-size: 1.18rem;
  display: flex;
  align-items: center;
  gap: 9px;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-badge {
  background: linear-gradient(135deg, var(--accent-cyan), #4f46e5);
  color: #ffffff;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 800;
  font-family: var(--font-mono);
}

.nav-link {
  color: var(--text-secondary) !important;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 7px 14px !important;
  border-radius: 8px;
  transition: var(--transition-fast);
}

.nav-link:hover, 
.nav-link.active {
  color: #ffffff !important;
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.active {
  color: var(--accent-cyan) !important;
  background: rgba(56, 189, 248, 0.1);
}

/* ==========================================================================
   HERO / OVERVIEW SECTION
   ========================================================================== */
.hero-section {
  padding-top: 135px;
  padding-bottom: 75px;
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.22);
  color: #34d399;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 9999px;
  margin-bottom: 22px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 14px;
  letter-spacing: -0.04em;
}

.hero-headline {
  font-size: 1.35rem;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin-bottom: 28px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.social-links-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.social-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 1.15rem;
  transition: var(--transition-fast);
  text-decoration: none;
}

.social-btn:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* Terminal / API Live Card */
.terminal-card {
  background: #090e1a;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.55), 0 0 30px rgba(56, 189, 248, 0.08);
  font-family: var(--font-mono);
  transition: var(--transition-smooth);
}

.terminal-card:hover {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.65), 0 0 35px rgba(56, 189, 248, 0.15);
}

.terminal-header {
  background: #0f172a;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  gap: 10px;
}

.terminal-buttons {
  display: flex;
  gap: 7px;
  flex-shrink: 0;
}

.terminal-circle {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.circle-red { background: #ef4444; }
.circle-yellow { background: #f59e0b; }
.circle-green { background: #10b981; }

.terminal-tabs {
  display: flex;
  gap: 4px;
}

.terminal-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
}

.terminal-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.terminal-tab.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.14);
}

.terminal-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.terminal-btn-action {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  font-size: 0.74rem;
  font-family: var(--font-mono);
  padding: 3px 9px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
}

.terminal-btn-action:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  color: #ffffff;
}

.terminal-body {
  padding: 22px;
  font-size: 0.85rem;
  line-height: 1.7;
  overflow-x: auto;
  min-height: 250px;
  -webkit-overflow-scrolling: touch;
}

.terminal-status-footer {
  padding: 8px 18px;
  background: #060a12;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.terminal-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px #10b981;
  animation: pulse-ring 2s infinite;
}

.code-keyword { color: #f43f5e; font-weight: 600; }
.code-fn { color: #38bdf8; }
.code-str { color: #a3e635; }
.code-comment { color: #64748b; font-style: italic; }
.code-var { color: #e2e8f0; }
.code-decorator { color: #fbbf24; }

/* Custom High-Craft Buttons */
.btn-primary-custom {
  background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
  color: #ffffff;
  font-weight: 600;
  padding: 11px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(56, 189, 248, 0.4);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-fast);
  box-shadow: 0 4px 18px var(--accent-cyan-glow);
  text-decoration: none;
  font-size: 0.94rem;
}

.btn-primary-custom:hover {
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.45);
}

.btn-outline-custom {
  background: rgba(255, 255, 255, 0.03);
  color: #e2e8f0;
  border: 1px solid var(--border-medium);
  font-weight: 600;
  padding: 11px 20px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-fast);
  text-decoration: none;
  font-size: 0.94rem;
}

.btn-outline-custom:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  transform: translateY(-2px);
}

/* Surface Cards */
.craft-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
}

.craft-card:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

/* Stat Metric Boxes */
.stat-box {
  background: rgba(13, 19, 33, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  transition: var(--transition-fast);
}

.stat-box:hover {
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.06);
}

.stat-number {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
  line-height: 1.35;
}

/* ==========================================================================
   PROJECTS SECTION
   ========================================================================== */
.filter-tabs-wrap {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 7px 18px;
  border-radius: 9999px;
  transition: var(--transition-fast);
}

.filter-btn:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.06);
}

.filter-btn.active {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  color: #ffffff;
  font-weight: 600;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: var(--transition-smooth);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.project-img-wrap {
  position: relative;
  width: 100%;
  height: 210px;
  overflow: hidden;
  background: #0b101d;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-card:hover .project-img {
  transform: scale(1.04);
}

.project-badge-pill {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(7, 10, 18, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.project-badge-pill.python-badge {
  border-color: rgba(245, 158, 11, 0.4);
  color: #fbbf24;
}

.project-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #ffffff;
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 16px;
  flex-grow: 1;
  line-height: 1.55;
}

.project-feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 18px 0;
}

.project-feature-list li {
  font-size: 0.85rem;
  color: #cbd5e1;
  padding-left: 18px;
  position: relative;
  margin-bottom: 6px;
}

.project-feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-emerald);
  font-weight: bold;
}

.project-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 3px 9px;
  border-radius: 4px;
}

.project-footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
}

/* ==========================================================================
   PROFICIENCIES & SKILLS SECTION
   ========================================================================== */
.skill-tabs-wrap {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 34px;
}

.skill-tab-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 500;
  padding: 7px 18px;
  border-radius: 9999px;
  transition: var(--transition-fast);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

.skill-tab-btn:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.06);
}

.skill-tab-btn.active {
  background: rgba(56, 189, 248, 0.12);
  border-color: var(--accent-cyan);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.2);
}

/* 6-Column Desktop / 4-Column Tablet / 3-Column Mobile Grid */
.proficiencies-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 14px;
}

.proficiency-card {
  background: rgba(13, 19, 33, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 18px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition-fast);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  cursor: default;
}

.proficiency-card:hover {
  background: rgba(20, 30, 52, 0.9);
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45), 0 0 18px rgba(56, 189, 248, 0.16);
}

.proficiency-icon {
  font-size: 2.1rem;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  transition: transform 0.3s ease;
}

.proficiency-card:hover .proficiency-icon {
  transform: scale(1.12);
}

.proficiency-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: #f1f5f9;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* Python Pipeline Card & Stepper */
.pipeline-card {
  background: linear-gradient(135deg, rgba(13, 19, 33, 0.95) 0%, rgba(18, 25, 42, 0.98) 100%);
  border: 1px solid rgba(245, 158, 11, 0.28);
  border-radius: var(--radius-xl);
  padding: 34px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.45);
}

.pipeline-stepper-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 28px 0 10px 0;
}

.pipeline-step-item {
  display: flex;
  align-items: center;
  flex: 1;
  gap: 8px;
}

.pipeline-step-node {
  position: relative;
  background: #0d121f;
  border: 1px solid rgba(245, 158, 11, 0.28);
  padding: 14px 16px;
  border-radius: 12px;
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition-fast);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.pipeline-step-node:hover {
  border-color: #fbbf24;
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.2);
}

.pipeline-step-node.highlight-finish {
  border-color: rgba(56, 189, 248, 0.4);
  background: linear-gradient(135deg, #0d1322 0%, #111a30 100%);
}

.pipeline-step-badge {
  position: absolute;
  top: -9px;
  left: 12px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #0b101d;
  font-size: 0.66rem;
  font-weight: 800;
  font-family: var(--font-mono);
  padding: 1px 6px;
  border-radius: 9999px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.pipeline-step-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.pipeline-node-title {
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.2;
}

.pipeline-node-sub {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.pipeline-step-connector {
  color: var(--accent-amber);
  font-size: 1.25rem;
  font-weight: bold;
  opacity: 0.8;
  flex-shrink: 0;
}

/* DSA Cards Grid */
.dsa-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition-fast);
}

.dsa-card:hover {
  border-color: var(--accent-cyan);
  background: rgba(22, 34, 58, 0.75);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35), 0 0 15px rgba(56, 189, 248, 0.1);
}

.dsa-name {
  font-weight: 600;
  color: #f1f5f9;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
}

.dsa-badge-active {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #34d399;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 3px 9px;
  border-radius: 9999px;
  white-space: nowrap;
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
}

.form-label {
  font-weight: 600;
  font-size: 0.88rem;
  color: #cbd5e1;
  margin-bottom: 6px;
}

.form-control-custom {
  background: #090e1a !important;
  border: 1px solid var(--border-medium) !important;
  color: #f8fafc !important;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-control-custom:focus {
  background: #0c1322 !important;
  border-color: var(--accent-cyan) !important;
  box-shadow: 0 0 0 3px var(--accent-cyan-glow) !important;
  color: #ffffff !important;
}

.form-control-custom::placeholder {
  color: var(--text-dim);
}

.contact-info-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition-fast);
}

.contact-info-card:hover {
  border-color: var(--border-focus);
  background: rgba(20, 30, 52, 0.8);
  transform: translateX(4px);
}

.contact-info-card a,
.contact-info-card div {
  word-break: break-word;
  overflow-wrap: anywhere;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* ==========================================================================
   FOOTER & BACK TO TOP
   ========================================================================== */
footer {
  background: #05080e;
  border-top: 1px solid var(--border-subtle);
  padding: 50px 0 30px 0;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.back-to-top-btn {
  position: fixed;
  bottom: 24px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(14, 165, 233, 0.9);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background: #38bdf8;
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(14, 165, 233, 0.65);
}

.back-to-top-btn:active {
  transform: scale(0.92);
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   ========================================================================== */

/* Touch feedback */
@media (hover: none) and (pointer: coarse) {
  .btn-primary-custom:active,
  .btn-outline-custom:active,
  .social-btn:active,
  .skill-chip:active,
  .dsa-card:active {
    transform: scale(0.97);
  }
}

/* Large Tablets & Below (< 992px) */
@media (max-width: 991.98px) {
  .navbar-collapse {
    background: rgba(9, 14, 25, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-lg);
    padding: 16px 14px;
    margin-top: 14px;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7);
  }

  .navbar-nav .nav-link {
    padding: 11px 16px !important;
    margin-bottom: 4px;
    border-radius: 8px;
    font-size: 0.96rem;
  }

  .hero-title {
    font-size: 2.85rem;
  }

  .proficiencies-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }

  .pipeline-stepper-wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    position: relative;
  }

  .pipeline-step-item {
    flex-direction: column;
    align-items: stretch;
    position: relative;
  }

  .pipeline-step-item:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 24px;
    bottom: -14px;
    height: 14px;
    width: 2px;
    background: rgba(245, 158, 11, 0.4);
    z-index: 1;
  }
}

/* Small Tablets / Landscape Mobile (< 768px) */
@media (max-width: 767.98px) {
  section {
    padding: 60px 0;
    scroll-margin-top: 70px;
  }

  .hero-section {
    padding-top: 105px;
    padding-bottom: 50px;
    min-height: auto;
  }

  .hero-title {
    font-size: 2.3rem;
    line-height: 1.18;
    margin-bottom: 12px;
  }

  .hero-headline {
    font-size: 1.15rem;
    line-height: 1.4;
    margin-bottom: 16px;
  }

  .hero-desc {
    font-size: 0.98rem;
    line-height: 1.6;
    margin-bottom: 24px;
  }

  .section-title {
    font-size: 1.85rem;
    margin-bottom: 10px;
  }

  .section-subtitle {
    font-size: 0.95rem;
    margin-bottom: 26px;
  }

  .proficiencies-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .proficiency-card {
    padding: 14px 6px;
  }

  .proficiency-icon {
    font-size: 1.85rem;
    height: 34px;
    margin-bottom: 6px;
  }

  .proficiency-name {
    font-size: 0.74rem;
  }

  .craft-card,
  .contact-container,
  .pipeline-card,
  .stack-box {
    padding: 22px 18px;
  }

  .hero-actions {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 22px;
  }

  .hero-actions .btn {
    width: auto;
    flex: 1 1 calc(50% - 10px);
    max-width: 165px;
    justify-content: center;
    font-size: 0.88rem;
    padding: 10px 14px;
  }

  .hero-actions .btn:last-child {
    flex: 1 1 100%;
    max-width: 200px;
  }

  /* CRITICAL: 16px prevents iOS automatic zoom on text inputs */
  .form-control-custom {
    font-size: 16px !important;
    padding: 12px 14px;
  }

  .project-img-wrap {
    height: 190px;
  }

  .project-body {
    padding: 20px 16px;
  }

  .project-title {
    font-size: 1.2rem;
  }

  .project-desc {
    font-size: 0.88rem;
    line-height: 1.55;
  }

  .project-footer-actions {
    flex-wrap: wrap;
    gap: 8px;
  }

  .project-footer-actions .btn {
    font-size: 0.82rem;
    padding: 8px 12px;
  }

  .contact-info-card {
    padding: 16px;
    margin-bottom: 12px;
    gap: 12px;
  }

  .contact-icon {
    width: 40px;
    height: 40px;
    font-size: 1.15rem;
  }

  .modal-dialog {
    margin: 12px;
  }

  .modal-body {
    padding: 18px !important;
  }
}

/* Standard Mobile Phones (< 576px) */
@media (max-width: 575.98px) {
  section {
    padding: 50px 0;
  }

  .hero-section {
    padding-top: 95px;
    padding-bottom: 38px;
  }

  .hero-status-pill {
    font-size: 0.76rem;
    padding: 5px 12px;
    margin-bottom: 16px;
    white-space: normal;
    text-align: left;
    max-width: 100%;
  }

  .hero-title {
    font-size: 1.95rem;
  }

  .hero-headline {
    font-size: 1.05rem;
  }

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

  .stat-box {
    padding: 14px 10px;
  }

  .stat-number {
    font-size: 1.65rem;
  }

  .stat-label {
    font-size: 0.75rem;
    line-height: 1.35;
  }

  /* Two-column action button grid in project card */
  .project-footer-actions .btn {
    flex: 1 1 calc(50% - 6px);
    justify-content: center;
    text-align: center;
  }

  .project-footer-actions .btn.ms-auto,
  .project-footer-actions .btn:last-child {
    flex: 1 1 100%;
    margin-left: 0 !important;
  }

  .filter-btn {
    font-size: 0.8rem !important;
    padding: 6px 14px !important;
  }

  .terminal-header {
    padding: 8px 12px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .terminal-tab {
    font-size: 0.7rem;
    padding: 3px 8px;
  }

  .terminal-btn-action {
    font-size: 0.7rem;
    padding: 2px 7px;
  }

  .terminal-body {
    padding: 16px 14px;
    font-size: 0.78rem;
    line-height: 1.6;
    min-height: 220px;
  }

  /* DSA 2-Column Responsive Card */
  .dsa-card {
    padding: 12px 14px;
    gap: 6px;
  }

  .dsa-name {
    font-size: 0.88rem;
  }

  .dsa-badge-active {
    font-size: 0.68rem;
    padding: 2px 7px;
  }

  .skill-chip {
    font-size: 0.8rem;
    padding: 5px 10px;
  }

  .back-to-top-btn {
    bottom: 18px;
    right: 16px;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }
}

/* Compact Mobile Screens (< 380px) */
@media (max-width: 379.98px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .section-title {
    font-size: 1.55rem;
  }

  .craft-card,
  .contact-container,
  .pipeline-card,
  .stack-box {
    padding: 18px 14px;
  }

  .dsa-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }

  .project-footer-actions .btn {
    flex: 1 1 100%;
  }

  .social-btn {
    width: 38px;
    height: 38px;
    font-size: 1.05rem;
  }
}