/* ==========================================================================
   Aurora Terminal — Freelance Landing Page
   base.css — design tokens, reset, typography, layout primitives
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokens
   -------------------------------------------------------------------------- */

:root {
  /* Brand ramps */
  --violet-400: #a78bfa;
  --violet-500: #8b5cf6;
  --violet-600: #7c3aed;
  --cyan-400:   #22d3ee;
  --cyan-500:   #06b6d4;
  --pink-400:   #ff6b9d;
  --pink-500:   #f43f5e;
  --lime-400:   #a3e635;
  --amber-400:  #fbbf24;

  /* Radii */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-2xl: 36px;
  --r-pill: 999px;

  /* Spacing rhythm */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;
  --sp-10: 128px;

  /* Type scale (fluid) */
  --fs-xs:   clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --fs-sm:   clamp(0.8125rem, 0.78rem + 0.2vw, 0.9rem);
  --fs-base: clamp(0.9375rem, 0.9rem + 0.2vw, 1.0625rem);
  --fs-md:   clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  --fs-lg:   clamp(1.2rem, 1.1rem + 0.5vw, 1.4rem);
  --fs-xl:   clamp(1.4rem, 1.25rem + 0.8vw, 1.8rem);
  --fs-2xl:  clamp(1.75rem, 1.5rem + 1.4vw, 2.4rem);
  --fs-3xl:  clamp(2.1rem, 1.6rem + 2.4vw, 3.5rem);
  --fs-4xl:  clamp(2.4rem, 1.55rem + 3.3vw, 4.25rem);

  /* Fonts */
  --font-display: "Space Grotesk", "Sora", ui-sans-serif, system-ui, -apple-system,
                  "Segoe UI", Roboto, sans-serif;
  --font-body:    "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
                  Roboto, "Helvetica Neue", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono",
                  Menlo, Consolas, monospace;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 160ms;
  --dur-mid: 320ms;
  --dur-slow: 640ms;

  /* Layout */
  --wrap: 1200px;
  --wrap-narrow: 860px;
  --header-h: 72px;
  --z-nav: 100;
  --z-overlay: 200;
  --z-cursor: 900;
  --z-preload: 1000;
}

/* --------------------------------------------------------------------------
   2. Theme — dark (default)
   -------------------------------------------------------------------------- */

:root,
[data-theme="dark"] {
  color-scheme: dark;

  --bg:          #06070d;
  --bg-soft:     #0a0c15;
  --surface:     rgba(255, 255, 255, 0.035);
  --surface-2:   rgba(255, 255, 255, 0.06);
  --surface-solid: #10121d;
  --surface-solid-2: #161a28;

  --text:        #f2f4fb;
  --text-soft:   #b6bccd;
  --text-muted:  #7e8699;

  --border:      rgba(255, 255, 255, 0.09);
  --border-2:    rgba(255, 255, 255, 0.16);

  --accent:      var(--violet-400);
  --accent-2:    var(--cyan-400);
  --accent-3:    var(--pink-400);

  --grad-brand:  linear-gradient(120deg, #8b5cf6 0%, #06b6d4 52%, #f43f5e 100%);
  --grad-brand-soft: linear-gradient(120deg, rgba(139, 92, 246, 0.22), rgba(6, 182, 212, 0.18), rgba(244, 63, 94, 0.18));

  --glow-v:  rgba(139, 92, 246, 0.30);
  --glow-c:  rgba(6, 182, 212, 0.26);
  --glow-p:  rgba(244, 63, 94, 0.24);

  --blob-1: #7c3aed;
  --blob-2: #0891b2;
  --blob-3: #be185d;

  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 14px 34px -12px rgba(0, 0, 0, 0.65);
  --shadow-lg: 0 34px 80px -28px rgba(0, 0, 0, 0.8);
  --shadow-brand: 0 18px 44px -14px rgba(124, 58, 237, 0.55);

  --grid-line: rgba(255, 255, 255, 0.035);
  --grain-opacity: 0.045;
  --img-filter: none;
  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   3. Theme — light
   -------------------------------------------------------------------------- */

[data-theme="light"] {
  color-scheme: light;

  --bg:          #f2f3f9;
  --bg-soft:     #fbfbfd;
  --surface:     rgba(255, 255, 255, 0.86);
  --surface-2:   rgba(255, 255, 255, 0.96);
  --surface-solid: #ffffff;
  --surface-solid-2: #f7f8fc;

  --text:        #0c0f1c;
  --text-soft:   #3c4356;
  --text-muted:  #646b80;

  --border:      rgba(12, 15, 28, 0.13);
  --border-2:    rgba(12, 15, 28, 0.22);

  --accent:      var(--violet-600);
  --accent-2:    var(--cyan-500);
  --accent-3:    var(--pink-500);

  --grad-brand:  linear-gradient(120deg, #7c3aed 0%, #0891b2 52%, #e11d48 100%);
  --grad-brand-soft: linear-gradient(120deg, rgba(124, 58, 237, 0.12), rgba(8, 145, 178, 0.10), rgba(225, 29, 72, 0.10));

  --glow-v:  rgba(124, 58, 237, 0.22);
  --glow-c:  rgba(8, 145, 178, 0.18);
  --glow-p:  rgba(225, 29, 72, 0.16);

  --blob-1: #c4b5fd;
  --blob-2: #a5f3fc;
  --blob-3: #fbcfe8;

  --shadow-sm: 0 2px 8px rgba(16, 20, 40, 0.06);
  --shadow-md: 0 14px 32px -14px rgba(16, 20, 40, 0.18);
  --shadow-lg: 0 34px 70px -30px rgba(16, 20, 40, 0.24);
  --shadow-brand: 0 18px 40px -16px rgba(124, 58, 237, 0.42);

  --grid-line: rgba(12, 15, 28, 0.045);
  --grain-opacity: 0.03;
  --img-filter: none;
  color-scheme: light;
}

/* --------------------------------------------------------------------------
   4. Reset
   -------------------------------------------------------------------------- */

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

* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  tab-size: 4;
}

body {
  min-height: 100svh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  font-synthesis-weight: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--dur-mid) var(--ease-out),
              color var(--dur-mid) var(--ease-out);
}

body.is-locked { overflow: hidden; }

img, svg, video, canvas, picture {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

button { cursor: pointer; }

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

ul, ol { list-style: none; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.028em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

::selection {
  background: var(--violet-500);
  color: #fff;
}

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

/* Scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-2);
  border-radius: var(--r-pill);
  border: 3px solid var(--bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* --------------------------------------------------------------------------
   5. Layout primitives
   -------------------------------------------------------------------------- */

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.wrap-narrow {
  width: min(100% - 2.5rem, var(--wrap-narrow));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(64px, 9vw, 128px);
}

.section--tight { padding-block: clamp(48px, 6vw, 80px); }

.section-head {
  max-width: 720px;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.stack { display: grid; gap: var(--sp-4); }
.row { display: flex; align-items: center; gap: var(--sp-3); }
.row-wrap { flex-wrap: wrap; }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--sp-4);
  z-index: calc(var(--z-nav) + 10);
  padding: 12px 20px;
  background: var(--violet-600);
  color: #fff;
  font-weight: 600;
  border-radius: var(--r-sm);
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--sp-4); }

/* --------------------------------------------------------------------------
   6. Typography helpers
   -------------------------------------------------------------------------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 15px 7px 12px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: var(--sp-5);
  width: fit-content;
}

.section-head--center .eyebrow { margin-inline: auto; }

.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--lime-400) 22%, transparent);
  animation: pulse-dot 2.4s var(--ease-in-out) infinite;
  flex: none;
}

.h-xl { font-size: var(--fs-4xl); }
.h-lg { font-size: var(--fs-3xl); }
.h-md { font-size: var(--fs-2xl); }
.h-sm { font-size: var(--fs-xl); }

.grad-text {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.lead {
  font-size: var(--fs-md);
  color: var(--text-soft);
  line-height: 1.7;
  max-width: 62ch;
}

.muted { color: var(--text-muted); }
.mono  { font-family: var(--font-mono); }

.hr {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--border-2), transparent);
}

/* --------------------------------------------------------------------------
   7. Buttons
   -------------------------------------------------------------------------- */

.btn {
  --btn-bg: var(--surface-2);
  --btn-fg: var(--text);
  --btn-bd: var(--border-2);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--btn-bd);
  border-radius: var(--r-pill);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  isolation: isolate;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(0.985); }

.btn__label { position: relative; z-index: 2; }
.btn svg { position: relative; z-index: 2; flex: none; }

/* Sheen sweep */
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.28) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform var(--dur-slow) var(--ease-out);
}
.btn:hover::after { transform: translateX(120%); }

.btn--primary {
  --btn-fg: #fff;
  --btn-bd: transparent;
  background: var(--grad-brand);
  background-size: 200% 200%;
  box-shadow: var(--shadow-brand);
}
.btn--primary:hover { background-position: 100% 0; }

.btn--ghost { background: transparent; }
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--surface);
}

.btn--lg { padding: 16px 30px; font-size: var(--fs-base); }
.btn--sm { padding: 10px 18px; font-size: var(--fs-xs); }
.btn--block { width: 100%; }

/* Icon-only round button */
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 42px; height: 42px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--surface);
  color: var(--text-soft);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
}
.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Text link with arrow */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--accent);
  transition: gap var(--dur-fast) var(--ease-out);
}
.link-arrow svg { transition: transform var(--dur-fast) var(--ease-out); }
.link-arrow:hover { gap: 12px; }
.link-arrow:hover svg { transform: translateX(3px); }

/* --------------------------------------------------------------------------
   8. Cards & surfaces
   -------------------------------------------------------------------------- */

.card {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--dur-mid) var(--ease-out),
              border-color var(--dur-mid) var(--ease-out),
              box-shadow var(--dur-mid) var(--ease-out);
}

.card--hover:hover {
  transform: translateY(-6px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
}

/* Cursor spotlight (position set by JS) */
.card--spot::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    380px circle at var(--mx, 50%) var(--my, 0%),
    color-mix(in srgb, var(--accent) 16%, transparent),
    transparent 62%
  );
  opacity: 0;
  transition: opacity var(--dur-mid) var(--ease-out);
  pointer-events: none;
}
.card--spot:hover::before { opacity: 1; }

.card--solid {
  background: var(--surface-solid);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* Gradient top hairline on hover */
.card--line::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--grad-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-slow) var(--ease-out);
}
.card--line:hover::after { transform: scaleX(1); }

/* --------------------------------------------------------------------------
   9. Background decor
   -------------------------------------------------------------------------- */

.bg-layer {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background: var(--bg);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 100% 60% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 100% 60% at 50% 0%, #000 30%, transparent 78%);
}

.bg-aurora {
  position: fixed;
  inset: 0;
  z-index: -3;
  overflow: hidden;
  pointer-events: none;
  filter: blur(70px);
  opacity: 0.75;
}
[data-theme="light"] .bg-aurora { opacity: 0.55; filter: blur(90px); }

.blob {
  position: absolute;
  border-radius: 50%;
  will-change: transform;
}
.blob--1 {
  width: 46vw; height: 46vw;
  min-width: 340px; min-height: 340px;
  top: -12vw; left: -8vw;
  background: var(--blob-1);
  opacity: 0.42;
  animation: drift-a 26s var(--ease-in-out) infinite;
}
.blob--2 {
  width: 40vw; height: 40vw;
  min-width: 300px; min-height: 300px;
  top: 24vh; right: -12vw;
  background: var(--blob-2);
  opacity: 0.32;
  animation: drift-b 32s var(--ease-in-out) infinite;
}
.blob--3 {
  width: 34vw; height: 34vw;
  min-width: 260px; min-height: 260px;
  bottom: -10vw; left: 28vw;
  background: var(--blob-3);
  opacity: 0.26;
  animation: drift-c 38s var(--ease-in-out) infinite;
}

.bg-grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* --------------------------------------------------------------------------
   10. Reveal animations
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
  transition-delay: var(--d, 0ms);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }

.reveal-x { transform: translateX(-32px); }
.reveal-x.is-in { transform: none; }

.reveal-scale { transform: scale(0.94); }
.reveal-scale.is-in { transform: none; }

.reveal-blur { filter: blur(14px); transform: translateY(24px); }
.reveal-blur.is-in { filter: none; transform: none; }

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.35); opacity: 0.6; }
}

@keyframes drift-a {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(8vw, 6vh, 0) scale(1.12); }
}
@keyframes drift-b {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(-10vw, 10vh, 0) scale(1.16); }
}
@keyframes drift-c {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(6vw, -8vh, 0) scale(0.9); }
}