:root {
  --color-bg: #f6f8fa;
  --color-bg-alt: #fff;
  --color-bg-card: #fff;
  --color-border: #e1e4e8;
  --color-border-dark: #d1d5da;
  --color-border-accent: #0366d6;
  --color-shadow: rgba(27,31,35,0.04);
  --color-shadow-hover: rgba(27,31,35,0.09);
  --color-primary: #0366d6;
  --color-primary-dark: #005cc5;
  --color-secondary: #2ea44f;
  --color-secondary-hover: #22863a;
  --color-text: #24292e;
  --color-text-light: #586069;
  --color-text-accent: #22863a;
  --color-graph-line: #e1e4e8;
  --color-tag-bg: #f6f8fa;
  --color-status-bg: #e6ffed;
  --color-status-text: #22863a;
  --color-hero-bg: #e1e4e8;
}

/* ==== Global Styles ==== */
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
  background-image: 
    linear-gradient(to right, var(--color-graph-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-graph-line) 1px, transparent 1px);
  background-size: 32px 32px;
  transition: background .3s;
}

/* ==== Navigation ==== */
.nav {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 6px var(--color-shadow);
  position: sticky;
  top: 0;
  z-index: 10;
  width: 100%;
}

.nav__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.2em 2em;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav__brand {
  font-weight: bold;
  font-size: 1.25em;
  color: var(--color-primary);
  letter-spacing: .5px;
  text-decoration: none;
  transition: color 0.18s;
}

.nav__brand:hover {
  color: var(--color-primary-dark);
}

.nav__menu {
  list-style: none;
  display: flex;
  gap: 1.2em;
  align-items: center;
  margin: 0;
}

.nav__toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-text);
  border-radius: 8px;
  padding: 8px;
  cursor: pointer;
  transition: background .18s;
}
.nav__toggle:hover, .nav__toggle:focus {
  background: var(--color-border);
}
.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  margin: 4px 2px;
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}

.nav__link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: .4em .9em;
  border-radius: 5px;
  transition: background .16s, color .18s;
}

.nav__link:hover,
.nav__link:focus {
  background: var(--color-border);
  color: var(--color-primary);
}

/* ==== Theme Toggle Button ==== */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  margin-left: 0.5em;
  padding: 0.3em;
  border-radius: 6px;
  transition: background 0.18s;
  display: flex;
  align-items: center;
}

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

.theme-icon {
  fill: var(--color-text);
  stroke: var(--color-text);
  display: none;
}
.theme-icon--sun {
  display: inline-block;
}
[data-color-scheme="dark"] .theme-icon--moon {
  display: inline-block;
}
[data-color-scheme="dark"] .theme-icon--sun {
  display: none;
}
[data-color-scheme="light"] .theme-icon--moon {
  display: none;
}

/* ==== Spacer Bar ==== */

.spacer-bg {
  height: 100vh;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-image: url('img/light.png'); /* Default image */
  position: relative;
  z-index: 1;
}
/* Default: Light, Landscape */
[data-color-scheme="light"] .spacer-bg {
  background-image: url('img/light.png');
}

/* Light, Portrait */
@media (orientation: portrait) {
  [data-color-scheme="light"] .spacer-bg {
    background-image: url('img/light2.png');
  }
}

/* Dark, Landscape */
[data-color-scheme="dark"] .spacer-bg {
  background-image: url('img/dark.png');
}

/* Dark, Portrait */
@media (orientation: portrait) {
  [data-color-scheme="dark"] .spacer-bg {
    background-image: url('img/dark2.png');
  }
}
.spacer-cta {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  z-index: 2;
}

.cta-text {
  display: block;
  font-size: 1.25rem;
  color: #fff; /* Adjust for light/dark backgrounds if desired */
  margin-bottom: 8px;
}

.arrow {
  display: inline-block;
  font-size: 2.2rem;
  color: #fff; /* Adjust for theme */
  animation: arrow-bounce 1s infinite;
}

@keyframes arrow-bounce {
  0%, 100% { transform: translateY(0); opacity:1; }
  50% { transform: translateY(12px); opacity:.7; }
}

/* ==== Section Containers ==== */
.section {
  margin: 0 auto 2.8em auto;
  padding: 3em 1em;
  max-width: 1100px;
  position: relative;
}
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1em;
}
.section__title {
  font-size: 2em;
  margin-top: 0;
  margin-bottom: 0.6em;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 0.5px;
  line-height: 1.1;
}
.section__subtitle {
  color: var(--color-text-light);
  font-size: 1.08em;
  margin-bottom: 1.6em;
}

/* ==== Hero Section ==== */
.hero {
  text-align: center;
  padding-top: 4em;
  padding-bottom: 4em;
  position: relative;
  min-height: 420px;
}
.hero__background {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom right, var(--color-hero-bg) 60%, var(--color-bg-alt) 100%);
  opacity: .2;
  z-index: 0;
  border-radius: 12px;
}
.hero__content {
  position: relative;
  z-index: 1;
}
.hero__title {
  font-size: 2.25em;
  font-weight: 800;
  letter-spacing: 0.7px;
  margin-bottom: 0.6em;
  color: var(--color-text);
}
.hero__subtitle {
  font-size: 1.08em;
  color: var(--color-text-light);
  font-weight: 500;
  background: var(--color-bg);
  border-radius: 5px;
  padding: 0.1em 0.4em;
}
.hero__description {
  font-size: 1.2em;
  color: #647ca3;
  margin-bottom: 1.5em;
}
.hero__cta.btn {
  margin-top: 1em;
}

/* ==== About Section ==== */
.about__content {
  display: flex;
  flex-direction: column;
  gap: 2em;
}
.about__highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5em;
}
.highlight {
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  padding: 1.2em 1em;
  box-shadow: 0 2px 8px var(--color-shadow);
  position: relative;
  transition: box-shadow .19s, transform .18s, border-color .19s;
}
.highlight:hover {
  border-color: var(--color-primary);
  box-shadow: 0 6px 18px var(--color-shadow-hover);
  transform: translateY(-3px) scale(1.015);
}
.about__mission {
  font-size: 1.15em;
  font-weight: 500;
  background: var(--color-bg);
  border-radius: 7px;
  padding: .45em .85em;
  margin: 1.2em 0 1.5em 0;
}
.about__projects-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2em;
  margin-top:1em;
}
.project-preview {
  background: var(--color-bg-card);
  border-radius: 9px;
  box-shadow: 0 1px 4px var(--color-shadow);
  border: 1.5px dashed var(--color-border);
  padding: 0.6em 1.2em;
  font-size: 1em;
  transition: box-shadow .21s;
}
.project-preview:hover {
  box-shadow: 0 6px 18px var(--color-shadow-hover);
  border-color: var(--color-primary);
}

/* ==== Skills Section ==== */
.tech-stack {
  display: grid;
  gap: 2em;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-bottom: 2em;
}
.tech-category {
  padding: 1em 0.5em 1em 0.5em;
}
.tech-category__title {
  font-size: 1.11em;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: .8em;
  letter-spacing: 0.1px;
}
.tech-items {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2em 0.8em;
}
.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: .98em;
  color: var(--color-text);
  text-decoration: none;
  margin-bottom: .5em;
  transition: color .18s;
}
.tech-item:hover{
  color: var(--color-primary);
}
.tech-item i {
  font-size: 2em;
  margin-bottom: .2em;
  color: inherit;
}
.skills__current {
  margin-top: 2em;
  background: var(--color-bg-card);
  border-radius: 10px;
  box-shadow: 0 1.5px 6px var(--color-shadow);
  border: 1px solid var(--color-border);
  padding: 1.2em 1.6em;
}

/* ==== Projects Section ==== */
.projects__grid {
  display: grid;
  gap: 2.5em;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  margin: 2em 0;
}
.project-card {
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  box-shadow: 0 2px 10px var(--color-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .18s, border-color .18s, transform .17s;
  position: relative;
}
.project-card:hover,
.project-card:focus-within {
  box-shadow: 0 8px 24px var(--color-shadow-hover);
  border-color: var(--color-primary);
  transform: translateY(-5px) scale(1.012);
}
.project-card__image,
.project-card__video {
  width: 100%;
  background: var(--color-bg);
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.project-card__image img,
.project-card__video video {
  max-width: 100%;
  max-height: 220px;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 2px 8px var(--color-shadow);
}
.project-card__content {
  padding: 1.1em 1.3em 1.2em 1.3em;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.6em;
  margin-bottom: 0.55em;
}
.project-card__title {
  font-size: 1.19em;
  font-weight: 700;
  margin: 0;
  color: var(--color-text);
}
.project-card__year {
  font-size: 1em;
  color: var(--color-text-light);
  font-weight: 400;
}
.status {
  font-size: 0.9em;
  background: var(--color-status-bg);
  color: var(--color-status-text);
  border-radius: 5px;
  padding: 0.15em 0.5em;
  font-weight: 500;
}
.status--success { background: var(--color-status-bg); color: var(--color-status-text);}
.project-card__description { 
  margin-bottom: 0.9em;
  color: var(--color-text);
  line-height: 1.6;
  font-size: 1.08em;
}
.project-card__tech {
  display: flex;
  gap: 0.6em;
  flex-wrap: wrap;
  margin-bottom: .5em;
}
.tech-tag {
  background: var(--color-tag-bg);
  color: var(--color-text);
  border-radius: 7px;
  padding: 0.22em 0.7em;
  font-size: 0.96em;
  border: 1px solid var(--color-border);
}
.project-card__link.btn {
  margin-top: .6em;
}

/* ==== Achievements ==== */
.achievement-card {
  background: var(--color-bg-card);
  border: 1.5px dashed var(--color-border);
  border-radius: 12px;
  box-shadow: 0 1.5px 10px var(--color-shadow);
  display: flex;
  gap: 1.2em;
  align-items: center;
  margin: 1.5em 0;
  padding: 1.6em 1.8em;
}
.achievement-card__icon {
  font-size: 2.3em;
}
.achievement-card__content h3 {
  margin: 0 0 0.4em 0;
  font-size: 1.05em;
  color: var(--color-primary);
}
.terminal__container {
    background: var(--color-background-alt);
    border-radius: 8px;
    padding: 20px;
    margin: 2rem 0;
}

.terminal__command-block {
    margin: 20px 0;
}

.command-wrapper {
    position: relative;
    background: var(--color-background-dark);
    border-radius: 6px;
    padding: 15px;
    margin: 15px 0;
}

.command-wrapper pre {
    margin: 0;
    overflow-x: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--color-primary);
    color: var(--color-text);
    border: none;
    border-radius: 4px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: opacity 0.2s;
}

.copy-btn:hover {
    opacity: 0.9;
}

.copy-btn .tooltip {
    position: absolute;
    background: var(--color-success);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    right: 0;
    top: -30px;
    opacity: 0;
    transition: opacity 0.2s;
}

.copy-btn.copied .tooltip {
    opacity: 1;
}

.terminal__instructions {
    background: var(--color-background);
    border-radius: 6px;
    padding: 20px;
    margin-top: 20px;
}

.terminal__instructions h3 {
    margin-top: 0;
    margin-bottom: 1rem;
}

.terminal__instructions ol {
    margin: 0;
    padding-left: 20px;
}

.terminal__instructions li {
    margin-bottom: 0.5rem;
}

.terminal__instructions kbd {
    background: var(--color-background-dark);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: 'Fira Code', monospace;
}

/* Terminal Styles */
.terminal__container {
    max-width: 900px;
    margin: 0 auto;
}

.terminal__window {
    background: var(--color-background-dark);
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    margin: 2rem 0;
}

.terminal__header {
    background: var(--color-background);
    padding: 12px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
}

.terminal__buttons {
    display: flex;
    gap: 8px;
    margin-right: 16px;
}

.terminal__button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-text-muted);
}

.terminal__title {
    color: var(--color-text-muted);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
}

.terminal__body {
    padding: 16px;
    min-height: 400px;
    max-height: 600px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

#terminal-output {
    flex-grow: 1;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    white-space: pre-wrap;
    color: var(--color-text);
}

.terminal__input-line {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.terminal__prompt {
    color: var(--color-primary);
    font-family: 'Fira Code', monospace;
    font-weight: bold;
}

#terminal-input {
    background: transparent;
    border: none;
    color: var(--color-text);
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    flex-grow: 1;
    outline: none;
}

[data-color-scheme="dark"] .terminal__window {
    --terminal-bg: #111;
    --terminal-text: #00ff66;
}

[data-color-scheme="light"] .terminal__window {
    --terminal-bg: #f9f9f9;
    --terminal-text: #111;
}

/* Terminal Message Types */
.terminal__message {
    padding: 4px 0;
    line-height: 1.4;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.terminal__message--user {
    color: var(--color-primary);
}

.terminal__message--system {
    color: var(--color-text);
}

.terminal__message--error {
    color: var(--color-error);
}

/* Terminal Input States */
#terminal-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Terminal Animations */
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.terminal__prompt::after {
    content: '▋';
    display: inline-block;
    animation: blink 1s infinite;
    margin-left: 2px;
}

/* ==== Contact ==== */
.contact__content {
  display: grid;
  gap: 2em;
  grid-template-columns: 1fr 1fr;
  align-items: flex-start;
}
.contact__info {
  display: flex;
  flex-direction: column;
  gap: 1.1em;
}
.contact__item {
  display: flex;
  align-items: center;
  gap: 0.7em;
  background: var(--color-bg-card);
  border-radius: 10px;
  box-shadow: 0 2px 7px var(--color-shadow);
  border: 1.5px solid var(--color-border);
  padding: 0.7em 1em;
  transition: border-color .16s;
}
.contact__item:hover {
  border-color: var(--color-primary);
}
.contact__icon {
  font-size: 1.3em;
  background: var(--color-bg);
  border-radius: 7px;
  padding: .19em .5em;
}
.contact__note {
  background: var(--color-bg);
  border-radius: 7px;
  margin-top: 1.2em;
  padding: 0.8em;
}

/* ==== Footer ==== */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 2em;
  margin-top: 6em;
  box-shadow: 0 -2px 7px var(--color-shadow);
}
.footer__content {
  font-size: 1.09em;
  color: var(--color-text-light);
}

/* ==== Buttons and CTAs ==== */
.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  padding: 0.7em 1.4em;
  font-size: 1em;
  font-weight: 600;
  border-radius: 7px;
  text-decoration: none;
  transition: background .17s, color .14s, border .15s, box-shadow .17s;
  margin: 0.2em;
  box-shadow: 0 1px 2px var(--color-shadow);
  background: var(--color-secondary);
  color: #fff;
}
.btn--primary {
  background: var(--color-primary);
}
.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn--lg {
  font-size: 1.15em;
  padding: 0.9em 2.1em;
}
.btn:hover, .btn:focus {
  background: var(--color-secondary-hover);
  color: #fff;
  box-shadow: 0 4px 14px var(--color-shadow-hover);
}
.btn--primary:hover, .btn--primary:focus {
  background: var(--color-primary-dark);
}
.btn--outline:hover, .btn--outline:focus {
  background: var(--color-primary);
  color: #fff;
}

/* ==== Misc Styling ==== */
h1, h2, h3, h4, h5, h6 {
  font-family: inherit;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1.5px dotted var(--color-border-dark);
  transition: color 0.18s, border-bottom 0.18s;
}
a:hover, a:focus {
  color: var(--color-primary-dark);
  border-bottom: 1.5px solid var(--color-primary);
  text-decoration: underline;
}

img, video {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 3px 12px var(--color-shadow);
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

/* Typography and lists */
p { margin: 1em 0; font-size: 1.1em; line-height: 1.68;}
strong { font-weight: bold; color: var(--color-text);}
em { font-style: italic; color: var(--color-text-light);}
ul, ol { margin: 1em 0 1em 2em; padding-left: 1.2em;}
li { margin-bottom: 0.5em; line-height: 1.6; }

/* Blockquotes for testimonials */
blockquote {
  background: var(--color-bg);
  border-left: 4px solid var(--color-primary);
  margin: 2em 0;
  padding: 1em 2em;
  font-style: italic;
  color: #444d56;
  border-radius: 8px;
}

/* Tables, code, pre */
table {
  border-collapse: collapse;
  margin: 1.5em 0;
  width: 100%;
}
th, td {
  border: 1px solid var(--color-border);
  padding: 0.7em 1em;
  text-align: left;
}
th {
  background: var(--color-bg);
  color: #2f363d;
  font-weight: 600;
}
code, pre {
  font-family: 'Fira Mono', 'Menlo', 'Monaco', 'Consolas', monospace;
  background: var(--color-bg);
  border-radius: 6px;
  padding: 0.2em 0.5em;
}
pre {
  overflow: auto;
  padding: 1em;
}

/* ==== Responsive Design ==== */
@media (max-width: 900px) {
  .nav__container {
    flex-direction: column;
    gap: 0.9em;
    padding: 0.6em 1em;
    position: relative;
  }
  .nav__toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 1em;
    top: 0.35em;
  }
  .nav__menu {
    width: 100%;
    flex-direction: column;
    gap: 0.4em;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    transition: max-height .25s ease, opacity .2s ease;
    padding: 0;
  }
  .nav__menu.is-open {
    max-height: 400px;
    opacity: 1;
    visibility: visible;
  }
  .nav__menu li { width: 100%; }
  .nav__menu .nav__link,
  .nav__menu .theme-toggle {
    display: block;
    width: 100%;
    text-align: center;
  }
  .projects__grid,
  .about__highlights,
  .tech-stack,
  .contact__content,
  .terminal__container {
    grid-template-columns: 1fr;
    gap: 1.2em;
    padding: 0;
  }
  .hero {
    padding: 2.5em 0 2em 0;
  }
  .section { padding: 2em .5em;}
  .container { padding: .5em;}
}

/* Hide scrollbar (optional, for aesthetic) */
::-webkit-scrollbar {
  width: 7px;
  background: var(--color-border);
}
::-webkit-scrollbar-thumb {
  background: #b8b8b8;
  border-radius: 10px;
}

/* ==== Dark theme override ==== */
[data-color-scheme="dark"] {
  --color-bg: #0d1117;
  --color-bg-alt: #161b22;
  --color-bg-card: #161b22;
  --color-border: #21262d;
  --color-border-dark: #161b22;
  --color-border-accent: #58a6ff;
  --color-shadow: rgba(27,31,35,0.11);
  --color-shadow-hover: rgba(27,31,35,0.21);
  --color-primary: #58a6ff;
  --color-primary-dark: #1f6feb;
  --color-secondary: #238636;
  --color-secondary-hover: #2ea043;
  --color-text: #c9d1d9;
  --color-text-light: #8b949e;
  --color-text-accent: #39d353;
  --color-graph-line: #21262d;
  --color-tag-bg: #161b22;
  --color-status-bg: #163820;
  --color-status-text: #39d353;
  --color-hero-bg: #161b22;
}