/* ==========================================================================
   global.css — Inside TuP
   Shared styles for all pages.
   Contains: Fonts, variables, reset, header/nav, footer.
   ========================================================================== */

/* ==========================================================================
   1. FONTS
   ========================================================================== */

@import url("https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&family=DM+Mono:wght@400;500&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200");

/* ==========================================================================
   2. VARIABLES
   ========================================================================== */

:root {
  /* Colors */
  --color-bg: #141417;
  --color-surface: #1e1e22;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);
  --color-text-primary: rgba(255, 255, 255, 0.92);
  --color-text-secondary: rgba(255, 255, 255, 0.55);
  --color-text-muted: rgba(255, 255, 255, 0.3);
  --color-accent: #7dd3b0;
  --color-accent-dim: rgba(125, 211, 176, 0.12);

  /* Typography */
  --font-body: "DM Sans", sans-serif;
  --font-mono: "DM Mono", monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Layout */
  --max-width: 1920px;
  --content-width: 780px;
  --container-pad: var(--space-6);
  --navbar-height: 56px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-base: 250ms ease;
  --t-slow: 400ms ease;
}

/* ==========================================================================
   3. RESET
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding-top: var(--navbar-height);
  background-color: var(--color-bg);
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
canvas {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

ul {
  list-style: none;
}

main {
  flex: 1;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   4. HEADER & NAV
   ========================================================================== */

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(20, 20, 23, 0.85);
  border-bottom: 0.5px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

nav > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--navbar-height);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

nav > div > a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.06em;
}

nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

nav ul a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color var(--t-fast);
}

nav ul a:hover,
nav ul a[aria-current="page"] {
  color: var(--color-text-primary);
}

nav button {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: var(--space-1);
}

nav button span {
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-text-secondary);
  transition:
    transform var(--t-base),
    opacity var(--t-base);
}

nav button[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

nav button[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

nav button[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (width <= 767px) {
  nav button {
    display: flex;
  }

  nav ul {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: var(--color-surface);
    border-bottom: 0.5px solid var(--color-border);
    padding: var(--space-2) 0;
  }

  nav ul.is-open {
    display: flex;
  }

  nav ul a {
    display: block;
    width: 100%;
    padding: var(--space-3) var(--container-pad);
    font-size: 1rem;
  }
}

/* ==========================================================================
   5. FOOTER
   ========================================================================== */

footer {
  padding-block: var(--space-8);
  margin-top: auto;
}

footer > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

footer span {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
}

footer a {
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
  transition: color var(--t-fast);
}

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