/* ============================================================
   CSS Custom Properties — colors match the Argus app (Tailwind values)
   ============================================================ */
:root {
  --color-bg: #f8fafc;          /* slate-50  — app page background (bg-slate-50) */
  --color-surface: #ffffff;     /* white     — cards, nav, footer */
  --color-surface-muted: #f3f4f6; /* gray-100 — hover bg, skeleton (bg-gray-100/200) */
  --color-border: #e5e7eb;      /* gray-200  — default card border (border-gray-200) */
  --color-border-muted: #d1d5db; /* gray-300 — outline button border (border-gray-300) */

  --color-accent: #3b82f6;      /* blue-500  — primary button bg (bg-blue-500) */
  --color-accent-hover: #1d4ed8; /* blue-700 — primary button hover (hover:bg-blue-700) */
  --color-accent-light: #eff6ff; /* blue-50  — selected card bg (bg-blue-50) */
  --color-accent-focus: #60a5fa; /* blue-400 — focus ring (ring-blue-400) */

  --color-text: #111827;        /* gray-900  — headings, primary text (text-gray-900) */
  --color-text-secondary: #1f2937; /* gray-800 — body text (text-gray-800) */
  --color-text-muted: #6b7280;  /* gray-500  — muted/secondary text (text-gray-500) */
  --color-text-link: #1d4ed8;   /* blue-700  — hover link color (hover:text-blue-700) */

  --color-code-bg: #111827;     /* gray-900  — session output / terminal (bg-gray-900) */
  --color-code-text: #d1d5db;   /* gray-300  — text on dark bg (text-gray-300) */

  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Monaco, monospace;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  --shadow-card: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-image: 0 4px 24px 0 rgb(0 0 0 / 0.12);

  --max-width: 1200px;
  --section-gap: 5rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ============================================================
   Layout Utilities
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--color-text);
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 3rem;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border-muted);
}

.btn--outline:hover {
  border-color: var(--color-accent-focus);
  color: var(--color-text-link);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
  font-size: 0.875rem;
  padding: 0.375rem 0.75rem;
}

.btn--ghost:hover {
  background-color: var(--color-surface-muted);
  color: var(--color-text);
}

/* ============================================================
   Nav
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: 0.75rem;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
}

.nav__brand:hover {
  text-decoration: none;
}

.nav__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex-shrink: 0;
}

.nav__name {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav__links a:not(.btn) {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
}

.nav__links a:not(.btn):hover {
  color: var(--color-text);
}

.btn--sm {
  padding: 0.4375rem 0.875rem;
  font-size: 0.875rem;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: 4rem 3rem;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .hero__headline {
    grid-column: 1 / -1;
  }
}

.hero__headline {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1rem;
  text-align: center;
}

.hero__supported {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.125rem 0.5rem;
  border-radius: 0.25rem;
}

.hero__badge--claude {
  background-color: #ffedd5; /* orange-100 */
  color: #7c2d12;            /* orange-800 */
}

.hero__badge--copilot {
  background-color: #f3e8ff; /* purple-100 */
  color: #3b0764;            /* purple-800 */
}

.hero__badge--os {
  background-color: #f1f5f9; /* slate-100 */
  color: #334155;            /* slate-700 */
}

.hero__subheadline {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  max-width: 44ch;
}

.hero__subheadline strong {
  color: var(--color-text);
  font-weight: 600;
}

.hero__install {
  display: flex;
  align-items: center;
  gap: 0;
  background-color: var(--color-code-bg);
  color: var(--color-code-text);
  border-radius: var(--radius-md);
  padding: 0.625rem 0.75rem;
  margin-bottom: 1.5rem;
  max-width: 26rem;
  font-family: var(--font-mono);
}

.install-command {
  flex: 1;
  font-size: 0.9375rem;
  color: var(--color-code-text);
  font-family: var(--font-mono);
}

.install-copy {
  color: var(--color-text-muted);
  border-color: transparent;
  flex-shrink: 0;
  margin-left: 0.5rem;
}

.install-copy:hover {
  background-color: rgba(255 255 255 / 0.1);
  color: #fff;
}

.install-copy.copied .copy-label::before {
  content: "Copied!";
}

.install-copy.copied .copy-label {
  font-size: 0;
}

.install-copy.copied .copy-label::before {
  font-size: 0.875rem;
  color: #4ade80;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__image-wrap {
  display: flex;
  justify-content: center;
}

.hero__image {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-image);
  width: 100%;
  max-width: 560px;
}

/* ============================================================
   Social Proof
   ============================================================ */
.social-proof {
  padding-block: 1.5rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.social-proof__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
}

.badge {
  height: 20px;
  border-radius: var(--radius-sm);
  display: block;
}

/* ============================================================
   Why Argus
   ============================================================ */
.why-argus {
  padding-block: var(--section-gap);
  background-color: var(--color-accent-light);
  border-bottom: 1px solid var(--color-border);
}

.why-argus__lead {
  max-width: 54ch;
  margin-inline: auto;
}

.why-argus__equation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.why-argus__term {
  background-color: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.5rem 1.125rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.why-argus__term--pain {
  background-color: #fee2e2;
  border-color: #fca5a5;
  color: #991b1b;
}

.why-argus__op {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-muted);
  line-height: 1;
}

.why-argus__resolution {
  text-align: center;
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-inline: auto;
}

.why-argus__resolution strong {
  color: var(--color-text);
}

/* ============================================================
   Features
   ============================================================ */
.features {
  padding-block: var(--section-gap);
  background-color: var(--color-accent-light);
}

.feature-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  margin-bottom: 4rem;
}

.feature-block:last-child {
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .feature-block--image-right {
    grid-template-columns: 1fr 1fr;
  }

  .feature-block--image-left {
    grid-template-columns: 1fr 1fr;
  }

  .feature-block--image-left .feature-block__text {
    order: 2;
  }

  .feature-block--image-left .feature-block__image-wrap {
    order: 1;
  }
}

.feature-block__text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.feature-block__text p {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 46ch;
}

.feature-block__image {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-image);
  border: 1px solid var(--color-border);
  width: 100%;
}

/* ============================================================
   How It Works
   ============================================================ */
.how-it-works {
  padding-block: var(--section-gap);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
}

.step-card__number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  line-height: 1;
}

.step-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-card__body {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.step-card__body code {
  background-color: var(--color-surface-muted);
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
  color: var(--color-accent);
}

.privacy-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.625rem;
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.privacy-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  padding-block: 2rem;
  background-color: var(--color-surface);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

@media (min-width: 640px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.footer__links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.footer__copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}