/* ============================================================
   base.css — Terminal Portfolio Design System
   ============================================================ */

/* --- Google Fonts ------------------------------------------ */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');

/* --- CSS Custom Properties --------------------------------- */
:root {
  /* Palette */
  --bg:       #0d0d0d;
  --bg-alt:   #111111;
  --surface:  #1a1a1a;
  --surface-2:#222222;
  --fg:       #e0e0e0;
  --fg-dim:   #888888;
  --dim:      #555555;
  --accent:   #5ef1ff;
  --accent-dim: rgba(94, 241, 255, 0.15);
  --accent-glow: rgba(94, 241, 255, 0.3);
  --error:    #ff5555;
  --warning:  #ffb000;
  --border:   #2a2a2a;

  /* Spacing (8px scale) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  /* Typography */
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --fs-xs:   0.7rem;
  --fs-sm:   0.8rem;
  --fs-base: 0.9rem;
  --fs-md:   1rem;
  --fs-lg:   1.2rem;
  --fs-xl:   1.5rem;
  --fs-2xl:  2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --max-width: 900px;
  --nav-height: 50px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--surface);
}

body {
  font-family: var(--font-mono);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--fg);
  background-color: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Scrollbar --------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--surface);
}
::-webkit-scrollbar-thumb {
  background: var(--dim);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* --- Scanline Overlay -------------------------------------- */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
}

/* --- Scroll Progress Bar ----------------------------------- */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  z-index: 10000;
  transition: width 50ms linear;
}

/* --- Page Transitions -------------------------------------- */
.page-exit {
  animation: fadeToBlack var(--transition-base) forwards;
}

.page-enter {
  animation: fadeFromBlack var(--transition-base) forwards;
}

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

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

/* --- Navigation -------------------------------------------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(13, 13, 13, 0.92);
}

.nav-logo {
  color: var(--accent);
  font-size: var(--fs-md);
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 1px;
}

.nav-logo:hover {
  text-shadow: 0 0 10px var(--accent-glow);
}

.nav-links {
  display: flex;
  gap: var(--space-2);
  list-style: none;
}

.nav-links a {
  color: var(--fg-dim);
  text-decoration: none;
  font-size: var(--fs-sm);
  padding: var(--space-1) var(--space-3);
  border: 1px solid transparent;
  border-radius: 3px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.nav-links a::before {
  content: '[ ';
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.nav-links a::after {
  content: ' ]';
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.nav-links a:hover::before,
.nav-links a:hover::after,
.nav-links a.active::before,
.nav-links a.active::after {
  opacity: 1;
}

/* Hamburger (mobile) */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--accent);
  transition: all var(--transition-fast);
}

.nav-hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Page Container ---------------------------------------- */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--nav-height) + var(--space-7)) var(--space-5) var(--space-8);
}

/* --- Page Header ------------------------------------------- */
.page-header {
  margin-bottom: var(--space-7);
}

.page-header__file {
  color: var(--accent);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: 1px;
}

.page-header__underline {
  width: 60px;
  height: 2px;
  background: var(--accent);
  margin-top: var(--space-2);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* --- Scroll Reveal ----------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

[data-reveal].visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Utility Classes --------------------------------------- */
.accent    { color: var(--accent); }
.dim       { color: var(--fg-dim); }
.error     { color: var(--error); }
.warning   { color: var(--warning); }
.text-sm   { font-size: var(--fs-sm); }
.text-xs   { font-size: var(--fs-xs); }
.mt-1      { margin-top: var(--space-2); }
.mt-2      { margin-top: var(--space-4); }
.mt-3      { margin-top: var(--space-6); }
.mb-1      { margin-bottom: var(--space-2); }
.mb-2      { margin-bottom: var(--space-4); }
.mb-3      { margin-bottom: var(--space-6); }

/* --- Footer ------------------------------------------------ */
.site-footer {
  text-align: center;
  padding: var(--space-6) var(--space-5);
  color: var(--dim);
  font-size: var(--fs-xs);
  border-top: 1px solid var(--border);
  margin-top: var(--space-8);
}

.site-footer .accent {
  text-shadow: 0 0 6px var(--accent-glow);
}

/* --- Responsive -------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --fs-base: 0.82rem;
    --fs-lg: 1.1rem;
    --fs-xl: 1.3rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(13, 13, 13, 0.97);
    border-bottom: 1px solid var(--border);
    padding: var(--space-4);
    gap: var(--space-1);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-hamburger {
    display: flex;
  }

  .page-container {
    padding: calc(var(--nav-height) + var(--space-5)) var(--space-4) var(--space-6);
  }
}

@media (max-width: 480px) {
  :root {
    --fs-base: 0.78rem;
    --fs-sm: 0.72rem;
  }
}

/* --- Reduced Motion ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* --- Blinking Cursor --------------------------------------- */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0; }
}

.cursor-blink {
  animation: blink 1s step-end infinite;
}