/* ==========================================================================
   RAHUL KUMAR JHA — MINIMALIST EDITORIAL PORTFOLIO
   Directly inspired by mackenziechild.me
   Clean, restrained, high-density Swiss typography, Zinc-950/Zinc-900 palette.
   ========================================================================== */

:root {
  /* Strict Zinc Color Palette (Mackenzie Child style) */
  --bg-page: #09090b;
  --bg-card: #121215;
  --bg-card-header: rgba(18, 18, 21, 0.82);
  --bg-surface: #18181b;
  --bg-surface-hover: #27272a;
  
  --border-subtle: #27272a;
  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-hover: #3f3f46;
  --border-dotted: #2d2d32;

  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --text-muted: #52525b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --header-height: 54px;
  --col-width: 440px;
  --col-radius: 28px;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

/* Subtle Scrollbars */
::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #27272a;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #3f3f46;
}

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

/* ==========================================================================
   FIXED MINIMALIST HEADER
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(9, 9, 11, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 100;
  display: flex;
  align-items: center;
}

.header-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.header-brand .brand-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 28px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.nav-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.nav-btn:active {
  transform: scale(0.98);
}

.nav-btn.resume-btn {
  padding: 0 10px;
}

.nav-btn.arrow-btn {
  width: 28px;
  padding: 0;
}

.nav-btn.arrow-btn svg {
  width: 13px;
  height: 13px;
}

.nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   HORIZONTAL DECK LAYOUT
   ========================================================================== */
.deck-main {
  width: 100%;
  height: 100%;
  padding-top: var(--header-height);
  overflow: hidden;
}

.deck-container {
  display: flex;
  gap: 20px;
  padding: 20px 24px 24px 24px;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

/* Column Structure */
.deck-column {
  flex: 0 0 var(--col-width);
  width: var(--col-width);
  height: 100%;
  scroll-snap-align: start;
}

.column-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--col-radius);
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  box-shadow: 0 8px 32px -4px rgba(0, 0, 0, 0.5);
}

/* Frosted Sticky Card Header */
.column-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: 46px;
  display: flex;
  align-items: center;
  padding: 0 20px;
  background: var(--bg-card-header);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  z-index: 10;
  flex-shrink: 0;
}

.column-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
}

/* Column Body Scrollable Area */
.column-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ==========================================================================
   COLUMN 1: ABOUT ME SPECIFICS
   ========================================================================== */
.avatar-card {
  width: 100%;
  aspect-ratio: 1.5 / 1;
  min-height: 260px;
  max-height: 290px;
  flex-shrink: 0;
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #0d1219;
  box-shadow: 0 12px 32px -8px rgba(0, 0, 0, 0.7), inset 0 0 0 1px rgba(255, 255, 255, 0.04);
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.22s cubic-bezier(0.2, 0, 0.2, 1), box-shadow 0.25s ease;
  will-change: transform;
}

.avatar-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.intro-block {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.intro-heading {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.intro-sub {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.action-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}

.btn-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 12.5px;
  font-weight: 500;
  padding: 6px 13px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-action svg {
  width: 13px;
  height: 13px;
  fill: currentColor;
}

.btn-action:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-hover);
}

.btn-action:active {
  transform: scale(0.98);
}

/* ==========================================================================
   MACKENZIE CHILD DOTTED SPECIFICATION PATTERN
   ========================================================================== */
.spec-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.spec-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.spec-title-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  width: 100%;
}

.spec-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.spec-dots {
  flex: 1;
  border-bottom: 1px dotted var(--border-dotted);
  height: 1px;
}

.spec-text {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-secondary);
}

.spec-text strong {
  color: var(--text-primary);
  font-weight: 500;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: #34d399; /* subtle muted mint, not glowing */
}

.status-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #10b981;
}

/* ==========================================================================
   COLUMN 2: TIMELINE ENTRIES
   ========================================================================== */
.timeline-group {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.timeline-entry {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.timeline-entry:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.entry-header {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.entry-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.entry-company {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.entry-date {
  font-size: 11.5px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}

.entry-role {
  font-size: 13px;
  font-weight: 500;
  color: #e4e4e7;
}

.entry-location {
  font-size: 11.5px;
  color: var(--text-tertiary);
}

.entry-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.entry-summary {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-secondary);
}

.entry-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.entry-bullets li {
  position: relative;
  padding-left: 14px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-secondary);
}

.entry-bullets li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--text-tertiary);
}

.entry-bullets li strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* Minimalist Tag Pill Row */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.tag-row span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 5px;
  padding: 2px 7px;
}

/* ==========================================================================
   COLUMN 3: PROJECTS
   ========================================================================== */
.projects-group {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.project-entry {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.project-entry:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.project-thumbnail {
  width: 100%;
  height: 210px;
  flex-shrink: 0;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: #000;
}

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

.project-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.project-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.project-name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.project-tag {
  font-size: 11.5px;
  color: var(--text-tertiary);
}

.project-text {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--text-secondary);
}

.metric-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.metric-row span {
  font-size: 11px;
  color: #d4d4d8;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 5px;
  padding: 3px 8px;
}

.project-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
}

.project-link-btn {
  font-size: 11.5px;
  padding: 5px 11px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
}

.project-link-btn:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-hover);
}

/* ==========================================================================
   COLUMN 4: SKILLS & CERTIFICATIONS
   ========================================================================== */
.section-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 6px;
}

.block-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.cert-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cert-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
}

.cert-main {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-primary);
}

.cert-issuer {
  font-size: 11px;
  color: var(--text-tertiary);
}

/* ==========================================================================
   COLUMN 5: CONTACT & FOOTER
   ========================================================================== */
.link-clean {
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color 0.15s ease;
}

.link-clean:hover {
  border-color: var(--text-secondary);
}

.download-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  margin-top: 8px;
}

.download-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.download-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
}

.download-meta {
  font-size: 11px;
  color: var(--text-tertiary);
}

.footer-note {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.text-xs {
  font-size: 11px;
}

.text-zinc-600 {
  color: var(--text-muted);
}

/* ==========================================================================
   RESPONSIVE (TABLET & MOBILE)
   ========================================================================== */
@media (max-width: 900px) {
  html, body {
    overflow-y: auto;
    overflow-x: hidden;
    height: auto;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .deck-main {
    height: auto;
    padding-top: 0;
    overflow: visible;
  }

  .deck-container {
    flex-direction: column;
    height: auto;
    overflow-y: visible;
    overflow-x: hidden;
    padding: 16px;
    gap: 16px;
    scroll-snap-type: none;
  }

  .deck-column {
    flex: 0 0 100%;
    width: 100%;
    height: auto;
  }

  .column-wrapper {
    height: auto;
    border-radius: 20px;
  }

  .column-body {
    height: auto;
    overflow-y: visible;
    padding: 18px;
  }

  .header-nav .arrow-btn {
    display: none;
  }
}