/* ----------------------------------------------------
   DESIGN SYSTEM & VARIABLES
   ---------------------------------------------------- */
:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: var(--font-sans);
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  --color-premium-bg: #FDFBF7;
  --color-premium-surface: #FFFFFF;
  --color-premium-active: #F4F2EC;
  --color-premium-heading: #2D3142;
  --color-premium-text: #6B7280;
  --color-premium-border: #EAE8E3;
  --color-premium-tag-bg: #F4F2EC;
  --color-premium-tag-text: #4B5563;
  --color-premium-accent: #CA9E67;
  --color-premium-shadow: rgba(202, 158, 103, 0.15);
  
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-y: scroll;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-premium-bg);
  color: var(--color-premium-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: 0;
  overflow-x: hidden;
}

/* Custom Selection Color */
::selection {
  background-color: var(--color-premium-heading);
  color: var(--color-premium-surface);
}

/* ----------------------------------------------------
   SCROLLBAR STYLES
   ---------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--color-premium-border);
  border-radius: 3px;
  transition: background-color 0.2s ease;
}

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

/* ----------------------------------------------------
   LAYOUTS & CONTAINER
   ---------------------------------------------------- */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: var(--color-premium-accent);
  z-index: 100;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.1s ease-out;
}

.portfolio-container {
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
}

/* Responsive Grid Breakpoints */
@media (min-width: 992px) {
  .portfolio-container {
    padding: 8rem 3rem;
  }
  .portfolio-grid {
    grid-template-columns: repeat(12, 1fr);
    gap: 5rem;
  }
  .info-sidebar {
    grid-column: span 5;
    position: sticky;
    top: 6rem;
    align-self: start;
    max-height: calc(100vh - 12rem);
    overflow-y: auto;
    padding-right: 1.5rem;
  }
  
  /* Scrollbar inside sidebar if needed */
  .info-sidebar::-webkit-scrollbar {
    width: 3px;
  }
  
  /* Hide scrollbar during animations to prevent flashing line */
  .is-animating .info-sidebar {
    overflow-y: hidden;
    scrollbar-width: none;
  }
  .is-animating .info-sidebar::-webkit-scrollbar {
    display: none;
  }
  
  .projects-list-column {
    grid-column: span 7;
  }
}

/* ----------------------------------------------------
   LEFT SIDEBAR CONTENT
   ---------------------------------------------------- */
.info-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.profile-photo-wrapper {
  position: relative;
  width: 5.5rem;
  height: 5.5rem;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid var(--color-premium-border);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .profile-photo-wrapper {
    width: 7rem;
    height: 7rem;
  }
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-name {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-premium-heading);
  letter-spacing: -0.03em;
}

@media (min-width: 768px) {
  .author-name {
    font-size: 2.75rem;
  }
}

.author-bio {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-premium-text);
  text-align: justify;
}

@media (min-width: 768px) {
  .author-bio {
    font-size: 1rem;
  }
}

.social-links-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn-contact {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--color-premium-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--color-premium-tag-text);
  text-decoration: none;
  background-color: var(--color-premium-tag-bg);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.btn-contact:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px var(--color-premium-shadow);
}

.icon-svg {
  stroke-width: 2;
  width: 0.75rem;
  height: 0.75rem;
  flex-shrink: 0;
}

.icon-arrow-diagonal {
  margin-left: 0.0625rem;
  opacity: 0.8;
  width: 0.5rem;
  height: 0.5rem;
  transition: transform var(--transition-smooth);
}

.btn-linkedin:hover .icon-arrow-diagonal {
  transform: translate(1px, -1px);
}

/* ----------------------------------------------------
   TIMELINE SECTION
   ---------------------------------------------------- */
.timeline-container {
  padding-top: 2rem;
  border-top: 1px solid var(--color-premium-border);
  width: 100%;
}

.timeline-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-premium-text);
  opacity: 0.8;
  margin-bottom: 1.5rem;
}

.timeline-list {
  display: flex;
  flex-direction: column;
}

.timeline-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-premium-border);
  transition: opacity var(--transition-smooth);
}

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

.timeline-item:first-child {
  padding-top: 0;
}

.timeline-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9375rem;
}

@media (min-width: 768px) {
  .timeline-row {
    font-size: 1.0625rem;
  }
}

.timeline-role {
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-premium-heading);
  transition: opacity var(--transition-smooth);
}

.timeline-item:hover .timeline-role {
  opacity: 0.8;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-premium-text);
  text-transform: uppercase;
  opacity: 0.8;
}

.timeline-company {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-premium-text);
}

/* ----------------------------------------------------
   RIGHT PROJECTS SECTION
   ---------------------------------------------------- */
.section-mono-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-premium-text);
  opacity: 0.8;
  margin-bottom: 1.5rem;
}

.accordion-group {
  display: flex;
  flex-direction: column;
}

.project-card-item {
  border-bottom: 1px solid var(--color-premium-border);
  scroll-margin-top: 2rem;
  position: relative;
  transition: background-color var(--transition-smooth);
}

@media (min-width: 992px) {
  .project-card-item {
    scroll-margin-top: 3rem;
  }
}

/* Accordion Active/Hover states */
.project-card-item:hover {
  background-color: rgba(244, 242, 236, 0.2);
}

.project-card-item.expanded {
  background-color: transparent;
}

/* Trigger Button */
.project-accordion-trigger {
  width: 100%;
  padding: 1.25rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  border: none;
  background: transparent;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  color: inherit;
}

@media (min-width: 576px) {
  .project-accordion-trigger {
    padding: 1.25rem 1.5rem;
  }
}

.trigger-layout {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 100%;
  padding-right: 0.5rem;
}

@media (min-width: 576px) {
  .trigger-layout {
    display: grid;
    /* Use 1fr for title, and exact space (max-content) for company and type */
    grid-template-columns: 1fr max-content max-content;
    gap: 1rem;
    align-items: center;
  }
}

.project-title-cell {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--color-premium-heading);
  transition: color var(--transition-smooth);
}

@media (min-width: 768px) {
  .project-title-cell {
    font-size: 0.875rem;
  }
}

.project-company-cell {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-premium-text);
}

.project-type-cell {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  color: var(--color-premium-text);
  opacity: 0.8;
}

/* Mobile responsive company/type row helper */
@media (max-width: 575.98px) {
  .project-company-cell {
    display: inline-block;
  }
  .project-company-cell::after {
    content: " • ";
    margin: 0 0.5rem;
    opacity: 0.5;
  }
  .project-type-cell {
    display: inline-block;
  }
}

.trigger-icon-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-premium-text);
  transition: color var(--transition-smooth);
}

.icon-minus {
  display: none;
}

/* Toggle minus/plus visibility based on expanded state */
.project-card-item.expanded .icon-plus {
  display: none;
}

.project-card-item.expanded .icon-minus {
  display: block;
}

/* ----------------------------------------------------
   ACCORDION CONTENT CONTAINER
   (Modern CSS Grid Row height animation technique)
   ---------------------------------------------------- */
.project-content-wrapper {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.project-card-item.expanded .project-content-wrapper {
  grid-template-rows: 1fr;
}

.project-content-inner {
  min-height: 0;
  transition: opacity 0.3s ease-in-out;
  opacity: 0;
}

.project-card-item.expanded .project-content-inner {
  opacity: 1;
}

.project-details {
  padding: 1.5rem 1rem 2rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 576px) {
  .project-details {
    padding: 1.5rem 1.5rem 2rem 1.5rem;
  }
}

.project-descriptions {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.challenge-text {
  font-size: 0.875rem;
  color: var(--color-premium-text);
  line-height: 1.7;
  text-align: justify;
}

.description-text {
  font-size: 0.875rem;
  color: var(--color-premium-text);
  opacity: 0.8;
  line-height: 1.7;
  text-align: justify;
}

/* Tech Stack Badge Styling */
.tech-stack-groups {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(234, 232, 227, 0.5);
}

.tech-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tech-group-title {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-premium-text);
  opacity: 0.8;
}

.tech-badges-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  border-radius: 4px;
  background-color: var(--color-premium-tag-bg);
  border: 1px solid var(--color-premium-border);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--color-premium-tag-text);
  letter-spacing: 0.05em;
  cursor: default;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.tech-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px var(--color-premium-shadow);
}

/* ----------------------------------------------------
   BACK TO TOP BUTTON
   ---------------------------------------------------- */
.back-to-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 100;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background-color: var(--color-premium-surface);
  border: 1px solid var(--color-premium-border);
  color: var(--color-premium-heading);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  box-shadow: 0 10px 20px rgba(45, 49, 66, 0.05);
  opacity: 0;
  transform: translateY(1.5rem) scale(0.9);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth), background-color var(--transition-smooth);
  pointer-events: none;
}

.back-to-top-btn.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.back-to-top-btn:hover {
  background-color: var(--color-premium-active);
}

.icon-arrow-up {
  width: 1.25rem;
  height: 1.25rem;
  stroke-width: 2.5;
}

/* ----------------------------------------------------
   LOADING ANIMATIONS & MOTION
   ---------------------------------------------------- */
.fade-animate-init,
.stagger-animate-init {
  opacity: 0;
}

.fade-animate-visible {
  animation: fadeInOnly 0.6s ease-out forwards;
}

.stagger-animate-visible {
  animation: slideUpFadeIn 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes fadeInOnly {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUpFadeIn {
  from {
    opacity: 0;
    transform: translateY(1.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .fade-animate-init,
  .stagger-animate-init {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* ----------------------------------------------------
   PRINT MEDIA STYLES
   ---------------------------------------------------- */
@media print {
  body {
    background-color: #ffffff;
    color: #000000;
  }
  .portfolio-container {
    padding: 0;
  }
  .portfolio-grid {
    display: block;
  }
  .info-sidebar {
    position: static !important;
    max-height: none !important;
    overflow-y: visible !important;
    padding-right: 0 !important;
    margin-bottom: 3rem;
  }
  .social-links-row, 
  .back-to-top-btn, 
  .scroll-progress-bar,
  .trigger-icon-container {
    display: none !important;
  }
  .project-content-wrapper {
    grid-template-rows: 1fr !important;
  }
  .project-content-inner {
    opacity: 1 !important;
  }
}

/* ----------------------------------------------------
   ACCESSIBILITY: FOCUS & REDUCED MOTION SUPPORT
   ---------------------------------------------------- */
.btn-contact:focus-visible,
.project-accordion-trigger:focus-visible,
.back-to-top-btn:focus-visible {
  outline: 2px solid var(--color-premium-accent);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .scroll-progress-bar {
    display: none !important;
  }
}