/* ==========================================
   ATNAF ABEBE — Portfolio Design System
   ========================================== */

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

/* --- CSS Variables --- */
:root {
  color-scheme: dark;
  --bg: #121212;
  --card-bg: transparent;
  --card-bg-hover: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.07);
  --card-border-hover: rgba(255, 255, 255, 0.13);
  --card-inset: inset 0 1px 0 0 rgba(255, 255, 255, 0.05);
  --text-primary: #ededed;
  --text-secondary: #999999;
  --text-muted: #555555;
  --text-heading: #cccccc;
  --accent: #5eead4;
  --accent-bg: rgba(94, 234, 212, 0.07);
  --accent-border: rgba(94, 234, 212, 0.14);
  --image-border: rgba(255, 255, 255, 0.08);
  --shadow: rgba(0, 0, 0, 0.35);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35);
  --scrollbar-track: transparent;
  --scrollbar-thumb: #2a2a2a;
  --scrollbar-thumb-hover: #3d3d3d;
  --selection-bg: rgba(94, 234, 212, 0.25);
  --gradient-color: rgba(94, 234, 212, 0.05);
  --focus-color: #5eead4;
  --skip-bg: #5eead4;
  --skip-text: #121212;
  --nav-indicator: #444444;
  --nav-indicator-active: #ededed;
  --nav-text: #555555;
  --nav-text-active: #ededed;
  --tag-text: #5eead4;
  --footer-text: #555555;
  --social-color: #555555;
  --social-hover: #ededed;
  --mobile-sticky-bg: rgba(18, 18, 18, 0.88);
  --transition-speed: 0.15s;
  --gradient-from: #5eead4;
  --gradient-to: #818cf8;
  --cta-gradient: linear-gradient(135deg, rgba(94, 234, 212, 0.06), rgba(129, 140, 248, 0.06));
  --toggle-bg: rgba(30, 30, 30, 0.7);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #faf8f5;
  --card-bg: #ffffff;
  --card-bg-hover: #f5f3ef;
  --card-border: rgba(168, 162, 158, 0.2);
  --card-border-hover: rgba(168, 162, 158, 0.35);
  --card-inset: inset 0 1px 0 0 rgba(168, 162, 158, 0.15);
  --text-primary: #2c2420;
  --text-secondary: #5a524d;
  --text-muted: #8a827d;
  --text-heading: #3d3530;
  --accent: #0f766e;
  --accent-bg: rgba(15, 118, 110, 0.08);
  --accent-border: rgba(15, 118, 110, 0.22);
  --image-border: rgba(168, 162, 158, 0.2);
  --shadow: rgba(44, 36, 32, 0.06);
  --shadow-card: 0 4px 20px rgba(44, 36, 32, 0.06);
  --scrollbar-track: transparent;
  --scrollbar-thumb: #d6cec8;
  --scrollbar-thumb-hover: #a8a29e;
  --selection-bg: rgba(15, 118, 110, 0.2);
  --gradient-color: rgba(168, 162, 158, 0.12);
  --focus-color: #0f766e;
  --skip-bg: #0f766e;
  --skip-text: #ffffff;
  --nav-indicator: #a8a29e;
  --nav-indicator-active: #2c2420;
  --nav-text: #a8a29e;
  --nav-text-active: #2c2420;
  --tag-text: #0f766e;
  --footer-text: #a8a29e;
  --social-color: #a8a29e;
  --social-hover: #2c2420;
  --mobile-sticky-bg: rgba(250, 248, 245, 0.92);
  --gradient-from: #0f766e;
  --gradient-to: #b45309;
  --cta-gradient: linear-gradient(135deg, rgba(15, 118, 110, 0.05), rgba(180, 83, 9, 0.04));
  --toggle-bg: rgba(255, 255, 255, 0.7);
}

/* --- Base --- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
  background-color: var(--selection-bg);
  color: var(--text-primary);
}

::-moz-selection {
  background-color: var(--selection-bg);
  color: var(--text-primary);
}

/* --- Mouse Gradient --- */
.gradient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

/* --- Skip Link --- */
.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  background: var(--skip-bg);
  color: var(--skip-text);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  z-index: 100;
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 1rem;
}

/* --- Layout --- */
.page-wrapper {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  gap: 2rem;
  min-height: 100vh;
}

/* --- Left Column --- */
.left-column {
  position: sticky;
  top: 0;
  width: 44%;
  max-height: 100vh;
  padding: 6rem 0;
  display: flex;
  flex-direction: column;
}

.header-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.header-top h1 a {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.header-top h2 {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  font-weight: 400;
  margin-top: 0.5rem;
  letter-spacing: -0.01em;
}

.tagline {
  color: var(--text-muted);
  margin-top: 0.875rem;
  max-width: 300px;
  font-size: 0.9375rem;
  line-height: 1.55;
}

/* --- Navigation --- */
.main-nav {
  margin-top: 4rem;
}

.main-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
  text-decoration: none;
  color: var(--nav-text);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.3s;
  width: fit-content;
}

.nav-indicator {
  display: inline-block;
  width: 2rem;
  height: 1px;
  background: var(--nav-indicator);
  transition: width 0.3s, background-color 0.3s;
}

.nav-link:hover .nav-indicator,
.nav-link.active .nav-indicator {
  width: 4rem;
  background: var(--nav-indicator-active);
}

.nav-link:hover,
.nav-link.active {
  color: var(--nav-text-active);
}

/* --- Social Links --- */
.social-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: auto;
}

.social-links a {
  color: var(--social-color);
  transition: color 0.3s ease, transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
}

.social-links a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

.social-links svg {
  width: 24px;
  height: 24px;
}

.contact-phone {
  display: inline-block;
  margin-top: 1.25rem;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.contact-phone:hover {
  color: var(--text-primary);
}

/* --- Right Column --- */
.right-column {
  width: 56%;
  padding: 6rem 0;
}

/* --- Sections --- */
.section {
  margin-bottom: 5rem;
}

.section:last-of-type {
  margin-bottom: 4rem;
}

.section-header-sticky {
  display: none;
}

.section-heading {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* --- About --- */
#about .section-content p {
  margin-bottom: 1rem;
  line-height: 1.625;
}

#about .section-content p:last-child {
  margin-bottom: 0;
}

/* --- Text Links --- */
.text-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

.text-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* --- Cards (shared) --- */
.experience-list,
.project-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.card {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--card-border);
  background-color: var(--card-bg);
  transition: background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  background-color: var(--card-bg-hover);
  box-shadow: var(--shadow-card);
  border-color: var(--card-border-hover);
}

.card-date {
  flex-shrink: 0;
  width: 8rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  color: var(--text-muted);
  margin-top: 0.25rem;
  line-height: 1.625;
}

.card-body {
  flex: 1;
  min-width: 0;
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-heading);
  line-height: 1.375;
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem;
  transition: color 0.15s ease;
}

.card-location {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-style: italic;
}

.card-date-inline {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  margin-bottom: 0.5rem;
}

.card-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.arrow-icon {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  margin-left: 0.25rem;
  transition: transform 0.2s;
}

.card:hover .card-title {
  color: var(--accent);
}

.card:hover .arrow-icon {
  transform: translate(2px, -2px);
}

/* --- Tags --- */
.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.tag {
  background: var(--accent-bg);
  color: var(--tag-text);
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 0.25rem 0.7rem;
  border-radius: 9999px;
  line-height: 1.5;
  border: 1px solid var(--accent-border);
  letter-spacing: 0.02em;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}


/* --- Project Cards --- */
.project-card {
  align-items: flex-start;
}

.card-image {
  flex-shrink: 0;
  width: 7rem;
  margin-top: 0.25rem;
  overflow: hidden;
  border-radius: 0.375rem;
  border: 1px solid var(--image-border);
  transition: border-color 0.15s ease;
}

.card:hover .card-image {
  border-color: var(--card-border-hover);
}

/* Project image placeholders */
.image-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
}

.sacco-gradient {
  background: linear-gradient(135deg, #0d9488, #065f46);
}

.goal-gradient {
  background: linear-gradient(135deg, #7c3aed, #4f46e5);
}

.events-gradient {
  background: linear-gradient(135deg, #e11d48, #be123c);
}

.codegen-gradient {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

/* --- Section Footer --- */
.section-footer {
  margin-top: 1rem;
  padding-left: 1.5rem;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

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

.footer-link:hover .arrow-icon {
  transform: translate(4px, -4px);
}

/* --- Site Footer --- */
.site-footer {
  margin-top: 1rem;
  padding-bottom: 4rem;
}

.site-footer p {
  font-size: 0.875rem;
  line-height: 1.625;
  color: var(--footer-text);
  max-width: 500px;
}

.site-footer .text-link {
  color: var(--text-secondary);
}

.site-footer .text-link:hover {
  color: var(--accent);
}

/* --- CTA --- */
.cta-card {
  padding: 2.5rem 2rem;
  border-radius: 0.5rem;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

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

.cta-heading {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.cta-body {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  max-width: 480px;
}

.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

.cta-link:hover {
  color: var(--accent);
}

.cta-link .arrow-icon {
  transition: transform 0.2s ease;
}

.cta-link:hover .arrow-icon {
  transform: translate(3px, -3px);
}

/* --- Focus --- */
a:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 9999px;
}

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

/* --- Theme Toggle --- */
.theme-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 50;
  width: 2.625rem;
  height: 2.625rem;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--toggle-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-card);
}

.theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-bg), var(--shadow-card);
  transform: scale(1.08);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 3px;
}

.theme-toggle svg {
  width: 1.125rem;
  height: 1.125rem;
  position: absolute;
  transition: opacity 0.3s ease, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.2s;
}

.theme-toggle .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: var(--text-muted);
}

.theme-toggle .sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
  color: var(--text-muted);
}

.theme-toggle:hover .moon-icon,
.theme-toggle:hover .sun-icon {
  color: var(--accent);
}

[data-theme="light"] .theme-toggle .moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="light"] .theme-toggle .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 1024px) {
  .page-wrapper {
    flex-direction: column;
    padding: 0 3rem;
  }

  .left-column {
    position: relative;
    width: 100%;
    max-height: none;
    padding: 6rem 0 0;
  }

  .main-nav {
    display: none;
  }

  .social-links {
    margin-top: 2rem;
    margin-bottom: 2rem;
  }

  .right-column {
    width: 100%;
    padding: 3rem 0 6rem;
  }

  .section-header-sticky {
    display: block;
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--mobile-sticky-bg);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    padding: 1.25rem 1.5rem;
    margin: 0 -1.5rem 2rem;
    transition: background-color 0.3s ease;
  }
}

@media (max-width: 640px) {
  .page-wrapper {
    padding: 0 1.5rem;
  }

  .left-column {
    padding-top: 3rem;
  }

  .header-top h1 a {
    font-size: 2.25rem;
  }

  .header-top h2 {
    font-size: 1rem;
  }

  .right-column {
    padding: 2rem 0 4.5rem;
  }

  .card {
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.25rem;
  }

  .card-date {
    width: auto;
  }

  .card-image {
    width: 6rem;
  }

  .section {
    margin-bottom: 4rem;
  }

  .section-header-sticky {
    margin: 0 -1.5rem 1.5rem;
    padding: 1rem 1.5rem;
  }
}