/* ============================================================
   SimpleAI — AI Assistant 247
   Nebula Console design system (AgentQL style reference)
   ============================================================ */

:root {
  /* Colors */
  --color-midnight-gaze: #0e111b;
  --color-astral-deep: #0d172b;
  --color-nebula-black: #050606;
  --color-page-canvas: #0b0c0e;
  --color-crystal-white: #ffffff;
  --color-lunar-dust: #abaebb;
  --color-ash-outline: #777a88;
  --color-comet-grey: #c7c9d1;
  --color-twilight-indigo: #12244f;
  --color-cosmic-violet: #1b346e;
  --color-starlight-violet: #85a6e9;
  --color-etherium-blue: #28b6ff;
  --color-violet-edge: #172540;

  --deep-space-glow: radial-gradient(79.43% 95.88% at 38.94% -53.46%, rgba(98, 95, 255, 0.38) 0px, rgba(0, 0, 0, 0));
  --pink-nova: radial-gradient(27.99% 22.08% at 72.13% 103.46%, rgba(255, 125, 218, 0.33) 0px, rgba(0, 0, 0, 0));

  /* Type */
  --font-display: 'Figtree', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, Menlo, monospace;

  /* Radius */
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-md: rgba(0, 0, 0, 0.2) 0px 3px 16px 0px;
  --shadow-xl: rgba(0, 0, 0, 0.5) 0px 4px 30px 0px;
  --shadow-xl-2: rgba(0, 0, 0, 0.34) 0px 20px 35px 0px, rgba(0, 0, 0, 0.25) 0px 4px 13px 0px;

  /* Layout */
  --page-max: 1408px;
  --content-max: 1120px;
  --section-gap: 104px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--color-page-canvas);
  color: var(--color-crystal-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(40, 182, 255, 0.3); }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ---------- Language visibility ---------- */
[data-lang] { display: none; }
body[data-active-lang="en"] [data-lang="en"] { display: revert; }
body[data-active-lang="vi"] [data-lang="vi"] { display: revert; }
/* inline variants */
span[data-lang], a[data-lang] { display: none; }
body[data-active-lang="en"] span[data-lang="en"],
body[data-active-lang="en"] a[data-lang="en"] { display: inline; }
body[data-active-lang="vi"] span[data-lang="vi"],
body[data-active-lang="vi"] a[data-lang="vi"] { display: inline; }

/* ---------- Helpers ---------- */
.wrap {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 28px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-etherium-blue);
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-etherium-blue), transparent);
}
.section { padding-block: clamp(64px, 9vw, var(--section-gap)); }

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; }

.h-display {
  font-size: clamp(40px, 6.4vw, 64px);
  line-height: 1.02;
}
.h-lg {
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1.13;
}
.h-sm { font-size: 20px; line-height: 1.25; letter-spacing: -0.027em; }

.lead {
  color: var(--color-lunar-dust);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.6;
  max-width: 60ch;
}

.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head .h-lg { margin-top: 16px; }
.section-head .lead { margin-top: 16px; }

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-full);
  padding: 12px 22px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--color-crystal-white);
  color: #0a0c12;
  box-shadow: 0 0 0 1px rgba(255,255,255,.1), 0 8px 30px rgba(133,166,233,.18);
}
.btn-primary:hover { box-shadow: 0 0 0 1px rgba(255,255,255,.2), 0 10px 38px rgba(133,166,233,.35); }
.btn-ghost {
  background: rgba(0,0,0,0);
  color: var(--color-lunar-dust);
  border-color: var(--color-ash-outline);
}
.btn-ghost:hover { color: var(--color-crystal-white); border-color: var(--color-lunar-dust); box-shadow: var(--shadow-md); }
.btn-zalo {
  background: linear-gradient(180deg, #2e7bff, #1f5fe0);
  color: #fff;
  box-shadow: 0 8px 30px rgba(40,123,255,.32);
}
.btn-zalo:hover { box-shadow: 0 12px 40px rgba(40,123,255,.5); }

/* ---------- Cards ---------- */
.card {
  background: var(--color-midnight-gaze);
  border: 1px solid var(--color-violet-edge);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-xl);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-astral-deep);
  border: 1px solid var(--color-violet-edge);
  color: var(--color-lunar-dust);
  border-radius: var(--radius-full);
  font-size: 13px;
  padding: 7px 14px;
}

/* atmosphere */
.glow {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}