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

:root {
  --c-bg-0: #f5f7fb;
  --c-bg-1: #fbfcff;
  --c-bg-2: #ffffff;
  --c-bg-3: #eef3fb;
  --c-bg-4: #e4ebf7;

  --c-surface-1: rgba(255, 255, 255, 0.72);
  --c-surface-2: rgba(255, 255, 255, 0.9);
  --c-surface-3: #ffffff;
  --c-surface-hover: rgba(255, 255, 255, 0.98);

  --c-border-1: rgba(15, 23, 42, 0.08);
  --c-border-2: rgba(15, 23, 42, 0.12);
  --c-border-3: rgba(15, 23, 42, 0.18);
  --c-border-focus: rgba(79, 70, 229, 0.28);

  --c-text-1: #0f172a;
  --c-text-2: rgba(15, 23, 42, 0.76);
  --c-text-3: rgba(15, 23, 42, 0.52);
  --c-text-4: rgba(15, 23, 42, 0.28);

  --c-accent: #4f46e5;
  --c-accent-hover: #4338ca;
  --c-accent-soft: #eef0ff;
  --c-accent-subtle: rgba(79, 70, 229, 0.1);
  --c-accent-border: rgba(79, 70, 229, 0.24);
  --c-accent-glow: rgba(99, 102, 241, 0.22);

  --c-success: #16a34a;
  --c-success-subtle: rgba(22, 163, 74, 0.11);
  --c-danger: #dc2626;
  --c-danger-subtle: rgba(220, 38, 38, 0.11);
  --c-warning: #d97706;
  --c-warning-subtle: rgba(217, 119, 6, 0.12);
  --c-info: #0f766e;
  --c-info-subtle: rgba(15, 118, 110, 0.1);

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-2xl: 30px;
  --radius-full: 9999px;

  --shadow-sm: 0 8px 20px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 20px 44px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 28px 70px rgba(15, 23, 42, 0.12);
  --shadow-xl: 0 40px 110px rgba(15, 23, 42, 0.16);
  --shadow-glow: 0 24px 60px rgba(99, 102, 241, 0.18);

  --blur-sm: blur(10px) saturate(140%);
  --blur-md: blur(18px) saturate(150%);
  --blur-lg: blur(28px) saturate(170%);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 220ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 440ms cubic-bezier(0.34, 1.56, 0.64, 1);

  --page-max: 1200px;
  --page-max-wide: 1400px;
}

html {
  font-family: var(--font-sans);
  background: var(--c-bg-0);
  color: var(--c-text-1);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 12%, rgba(125, 211, 252, 0.32), transparent 22%),
    radial-gradient(circle at 88% 14%, rgba(253, 230, 138, 0.3), transparent 20%),
    radial-gradient(circle at 82% 82%, rgba(196, 181, 253, 0.26), transparent 20%),
    linear-gradient(180deg, #fffdf6 0%, #f7f9ff 38%, #eef4fb 100%);
  color: var(--c-text-1);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; outline: none; background: none; }
input, textarea, select { font-family: inherit; outline: none; }
img { max-width: 100%; display: block; }
table { width: 100%; border-collapse: collapse; }

::selection {
  background: rgba(79, 70, 229, 0.16);
  color: var(--c-text-1);
}

.app-shell,
.app-noise-wrapper {
  position: relative;
  min-height: 100vh;
}

.app-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(rgba(15, 23, 42, 0.08) 0.6px, transparent 0.6px),
    radial-gradient(rgba(255, 255, 255, 0.6) 0.8px, transparent 0.8px);
  background-position: 0 0, 12px 12px;
  background-size: 24px 24px;
  mix-blend-mode: soft-light;
  opacity: 0.4;
}

.page-container {
  width: min(100%, var(--page-max));
  margin: 0 auto;
}

.page-container-wide {
  width: min(100%, var(--page-max-wide));
  margin: 0 auto;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.text-mono { font-family: var(--font-mono); }
.text-muted { color: var(--c-text-3); }
.text-subtle { color: var(--c-text-2); }
.text-accent { color: var(--c-accent); }

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 22px;
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.stack-8 { display: flex; flex-direction: column; gap: 8px; }
.stack-12 { display: flex; flex-direction: column; gap: 12px; }
.stack-16 { display: flex; flex-direction: column; gap: 16px; }
.stack-20 { display: flex; flex-direction: column; gap: 20px; }
.stack-24 { display: flex; flex-direction: column; gap: 24px; }
.stack-32 { display: flex; flex-direction: column; gap: 32px; }

@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}