/* ==========================================================================
   SAZID MOONTASIR - MINIMAL TYPEWRITER PORTFOLIO
   Pure CSS3 Stylesheet
   ========================================================================== */

:root {
  --background: #ffffff;
  --text: #111111;
  --secondary-text: #666666;
  --border: #e5e5e5;
  --hover-background: #f5f5f5;
  --font-mono: "Courier New", Courier, "Lucida Console", "Liberation Mono", "DejaVu Sans Mono", monospace;
  --content-width: 860px;
  --line-height-base: 1.65;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2.5rem;
  --spacing-2xl: 3.5rem;
}

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

html {
  font-size: 16px;
  background-color: var(--background);
  color: var(--text);
  font-family: var(--font-mono);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--background);
  color: var(--text);
  padding: 0;
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 1rem;
  background: var(--text);
  color: var(--background);
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  z-index: 1000;
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--text);
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

/* Header & Navigation */
.site-header {
  border-bottom: 1px solid var(--border);
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  background-color: var(--background);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
}

.site-title:hover {
  opacity: 0.75;
}

.nav-right-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
  flex-wrap: wrap;
}

.main-nav a {
  font-size: 0.9375rem;
  color: var(--secondary-text);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1.5px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
  letter-spacing: 0.04em;
}

.main-nav a:hover {
  color: var(--text);
  border-bottom-color: var(--border);
}

.main-nav a.active {
  color: var(--text);
  font-weight: 700;
  border-bottom-color: var(--text);
}

/* Theme Toggle (Pure CSS3 - Zero JavaScript) */
.theme-toggle-wrapper {
  display: inline-flex;
  align-items: center;
}

.theme-toggle-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--secondary-text);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  background-color: var(--background);
  cursor: pointer;
  user-select: none;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.theme-toggle-btn:hover {
  color: var(--text);
  border-color: var(--text);
  background-color: var(--hover-background);
}

.theme-toggle-input:focus-visible + .theme-toggle-btn {
  outline: 2px dashed var(--text);
  outline-offset: 3px;
}

.toggle-icon {
  font-size: 0.875rem;
  line-height: 1;
}

.toggle-dark-label {
  display: inline;
}

.toggle-light-label {
  display: none;
}

/* ==========================================================================
   DARK THEME VIA CSS :has() SELECTOR
   ========================================================================== */
html:has(#theme-toggle:checked) {
  --background: #111111;
  --text: #f5f5f5;
  --secondary-text: #999999;
  --border: #2a2a2a;
  --hover-background: #1c1c1c;
}

html:has(#theme-toggle:checked) .toggle-dark-label {
  display: none;
}

html:has(#theme-toggle:checked) .toggle-light-label {
  display: inline;
}

html:has(#theme-toggle:checked) .profile-img {
  filter: grayscale(100%) contrast(110%) brightness(0.95);
}

html:has(#theme-toggle:checked) .education-logo-box img {
  filter: invert(1) brightness(0.95);
}

html:has(#theme-toggle:checked) .contact-icon img {
  filter: invert(1);
}

html:has(#theme-toggle:checked) .skill-row {
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

/* Main Content Area */
main {
  flex: 1 0 auto;
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-2xl);
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

h1 {
  font-size: 1.75rem;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.25rem;
  letter-spacing: 0.06em;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
}

h3 {
  font-size: 1.05rem;
  margin-bottom: var(--spacing-xs);
}

p {
  margin-bottom: var(--spacing-md);
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
}

p.secondary-text,
.text-muted {
  color: var(--secondary-text);
}

a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.15s ease;
}

a:hover {
  opacity: 0.7;
}

a:focus-visible,
button:focus-visible {
  outline: 2px dashed var(--text);
  outline-offset: 4px;
}

/* Page Intro Header */
.page-intro {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border);
}

.page-intro p {
  color: var(--secondary-text);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* ==========================================================================
   HOMEPAGE (index.html)
   ========================================================================== */
.hero-split {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.profile-img-frame {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--text);
  padding: 4px;
  background-color: var(--background);
}

.profile-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(100%) contrast(105%);
}

.profile-caption {
  font-size: 0.8125rem;
  color: var(--secondary-text);
  text-align: center;
  margin-top: var(--spacing-xs);
  letter-spacing: 0.03em;
}

.hero-content {
  display: flex;
  flex-direction: column;
}

.greeting-kicker {
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary-text);
  margin-bottom: var(--spacing-xs);
}

/* CSS-Only Typewriter Headline */
.typewriter-wrapper {
  display: inline-block;
  margin-bottom: var(--spacing-sm);
  max-width: 100%;
}

.typewriter-text {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
  overflow: hidden;
  border-right: 2px solid var(--text);
  animation: typing 2.0s steps(15, end) 1, blink-caret 0.75s step-end infinite;
  display: inline-block;
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink-caret {
  from, to { border-color: transparent; }
  50% { border-color: var(--text); }
}

/* Identity Subtitle */
.identity-line {
  font-size: 1.05rem;
  color: var(--secondary-text);
  margin-bottom: var(--spacing-lg);
  font-weight: normal;
}

.bio-paragraph {
  margin-bottom: var(--spacing-md);
  text-align: left;
}

.section-callout {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px dashed var(--border);
}

.section-callout-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-xs);
  color: var(--secondary-text);
}

.quick-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  list-style: none;
  margin-top: var(--spacing-sm);
}

.quick-nav-list a {
  font-size: 0.875rem;
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
  background-color: var(--background);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.quick-nav-list a:hover {
  background-color: var(--hover-background);
  border-color: var(--text);
}

/* ==========================================================================
   EDUCATION PAGE (education.html)
   ========================================================================== */
.education-list {
  display: flex;
  flex-direction: column;
}

.education-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  align-items: start;
}

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

.education-logo-box {
  width: 56px;
  height: 56px;
  border: 1px solid var(--border);
  background-color: var(--hover-background);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
}

.education-logo-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  filter: grayscale(100%);
}

.education-details {
  display: flex;
  flex-direction: column;
}

.institution-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

.institution-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
}

.education-dates {
  font-size: 0.875rem;
  color: var(--secondary-text);
  letter-spacing: 0.04em;
}

.education-degree {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.15rem;
}

.education-dept {
  font-size: 0.875rem;
  color: var(--secondary-text);
  margin-bottom: var(--spacing-xs);
}

.education-desc {
  font-size: 0.875rem;
  color: var(--text);
  margin-top: var(--spacing-xs);
  margin-bottom: 0;
  line-height: 1.6;
}

/* ==========================================================================
   SKILLS PAGE (skills.html)
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

@media (min-width: 680px) {
  .skills-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
  }
}

.skill-category {
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--spacing-lg);
}

.skill-category:last-child {
  border-bottom: none;
}

.skill-category-title {
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px dashed var(--border);
  color: var(--text);
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.skill-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
  font-size: 0.9375rem;
  border-bottom: 1px dotted rgba(0, 0, 0, 0.08);
}

.skill-row:last-child {
  border-bottom: none;
}

.skill-name {
  font-weight: 500;
  color: var(--text);
}

.skill-level {
  font-size: 0.8125rem;
  color: var(--secondary-text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ==========================================================================
   WORK & PROJECTS PAGE (work.html)
   ========================================================================== */
.work-section {
  margin-bottom: var(--spacing-2xl);
}

.work-section:last-child {
  margin-bottom: 0;
}

.work-section-title {
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--border);
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.project-item {
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

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

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

.project-title {
  font-size: 1.125rem;
  font-weight: 700;
}

.project-dates {
  font-size: 0.8125rem;
  color: var(--secondary-text);
  letter-spacing: 0.04em;
}

.project-role {
  font-size: 0.875rem;
  color: var(--secondary-text);
  margin-bottom: var(--spacing-xs);
}

.project-desc {
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-sm);
  line-height: 1.65;
}

.project-tech {
  font-size: 0.8125rem;
  color: var(--secondary-text);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.02em;
}

.project-tech strong {
  color: var(--text);
  font-weight: 600;
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.project-links a {
  font-size: 0.875rem;
  text-decoration: none;
  border-bottom: 1px solid var(--text);
  padding-bottom: 1px;
}

.project-links a:hover {
  background-color: var(--hover-background);
}

/* ==========================================================================
   CONTACT PAGE (contact.html)
   ========================================================================== */
.contact-container {
  display: flex;
  flex-direction: column;
}

.contact-note {
  margin-bottom: var(--spacing-xl);
  max-width: 650px;
}

.contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.contact-link-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 1px solid var(--border);
  text-decoration: none;
  background-color: var(--background);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.contact-link-card:hover {
  background-color: var(--hover-background);
  border-color: var(--text);
  opacity: 1;
}

.contact-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  flex-shrink: 0;
}

.contact-icon img,
.contact-icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.contact-info {
  display: flex;
  flex-direction: column;
}

.contact-platform {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
}

.contact-handle {
  font-size: 0.8125rem;
  color: var(--secondary-text);
}

/* Notice box for editable placeholders */
.notice-box {
  border: 1px dashed var(--border);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--hover-background);
  font-size: 0.8125rem;
  color: var(--secondary-text);
  margin-top: var(--spacing-lg);
  line-height: 1.6;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  margin-top: auto;
  background-color: var(--background);
  text-align: center;
}

.footer-text {
  font-size: 0.8125rem;
  color: var(--secondary-text);
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.footer-subtext {
  font-size: 0.75rem;
  color: var(--secondary-text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0;
}

/* ==========================================================================
   ACCESSIBILITY & REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .typewriter-text {
    animation: none;
    border-right: none;
    white-space: normal;
  }
  
  *, *::before, *::after {
    transition: none !important;
  }
}

/* ==========================================================================
   RESPONSIVE DESIGN (Media Queries)
   ========================================================================== */
@media (max-width: 768px) {
  .hero-split {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .profile-img-frame {
    max-width: 220px;
    margin-left: auto;
    margin-right: auto;
  }

  .nav-container {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .nav-right-group {
    width: 100%;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
  }

  .main-nav ul {
    gap: var(--spacing-md);
  }

  .typewriter-text {
    font-size: 1.45rem;
    white-space: normal;
    border-right: none;
    animation: none;
  }

  .education-item {
    grid-template-columns: 44px 1fr;
    gap: var(--spacing-md);
  }

  .education-logo-box {
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .main-nav ul {
    gap: 0.75rem 1rem;
  }

  .main-nav a {
    font-size: 0.875rem;
  }

  .institution-header,
  .project-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-link-card {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}