/* ============================================
   MedBites — Medical-Minimalist Design System
   ============================================ */

:root {
  --color-navy: #1b2a4a;
  --color-navy-light: #2c4270;
  --color-green: #1a6b5a;
  --color-green-light: #e8f5f1;
  --color-white: #ffffff;
  --color-off-white: #f8f9fb;
  --color-gray-100: #f1f3f6;
  --color-gray-200: #e2e6ec;
  --color-gray-400: #8b95a5;
  --color-gray-600: #5a6474;
  --color-gray-800: #2d3440;
  --color-text: #1e2530;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(27, 42, 74, 0.06);
  --shadow-md: 0 4px 20px rgba(27, 42, 74, 0.08);
  --shadow-lg: 0 8px 40px rgba(27, 42, 74, 0.1);

  --max-width: 1120px;
  --header-height: 72px;
}

/* Reset & Base */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-white);
}

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

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

ul {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--color-navy);
  border-radius: var(--radius-sm);
  position: relative;
}

.logo-mark::after {
  content: '';
  position: absolute;
  bottom: 6px;
  right: 6px;
  width: 10px;
  height: 10px;
  background: var(--color-green);
  border-radius: 2px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-gray-600);
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--color-navy);
}

.nav-cta {
  background: var(--color-navy);
  color: var(--color-white) !important;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  transition: background 0.2s !important;
}

.nav-cta:hover {
  background: var(--color-navy-light) !important;
}

/* Hero */

.hero {
  padding: 5rem 0 6rem;
  background: linear-gradient(180deg, var(--color-off-white) 0%, var(--color-white) 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-green);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-navy);
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--color-gray-600);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.7;
}

/* Signup Form */

.signup-form {
  max-width: 480px;
}

.form-fields {
  display: flex;
  gap: 0.5rem;
  background: var(--color-white);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 0.35rem;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-fields:focus-within {
  border-color: var(--color-green);
  box-shadow: 0 0 0 3px rgba(26, 107, 90, 0.12);
}

.form-fields input[type="email"] {
  flex: 1;
  border: none;
  outline: none;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text);
  background: transparent;
  min-width: 0;
}

.form-fields input[type="email"]::placeholder {
  color: var(--color-gray-400);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--color-green);
  color: var(--color-white);
  padding: 0.75rem 1.4rem;
}

.btn-primary:hover {
  background: #155a4b;
}

.form-note {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-gray-400);
}

/* Hero Visual Card */

.hero-visual {
  display: flex;
  justify-content: center;
}

.visual-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.visual-header {
  display: flex;
  gap: 6px;
  padding: 1rem 1.25rem;
  background: var(--color-gray-100);
  border-bottom: 1px solid var(--color-gray-200);
}

.visual-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-gray-200);
}

.visual-dot:first-child { background: #e8a0a0; }
.visual-dot:nth-child(2) { background: #e8d5a0; }
.visual-dot:nth-child(3) { background: #a0d5b8; }

.visual-body {
  padding: 2rem 1.75rem;
}

.visual-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-green);
  margin-bottom: 1.25rem;
}

.visual-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0;
  font-size: 0.95rem;
  color: var(--color-gray-800);
  border-bottom: 1px solid var(--color-gray-100);
}

.visual-list li:last-child {
  border-bottom: none;
}

.visual-list .check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--color-green-light);
  color: var(--color-green);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* About */

.about {
  padding: 6rem 0;
  background: var(--color-white);
}

.about-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.section-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-green);
  margin-bottom: 0.75rem;
}

.about h2,
.resources h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-navy);
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.about-text p {
  color: var(--color-gray-600);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-credentials {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.credential-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-off-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
}

.credential-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-green-light);
  color: var(--color-green);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.credential-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 0.15rem;
}

.credential-desc {
  font-size: 0.85rem;
  color: var(--color-gray-400);
}

/* Resources */

.resources {
  padding: 6rem 0;
  background: var(--color-off-white);
  border-top: 1px solid var(--color-gray-200);
}

.resources-intro {
  color: var(--color-gray-600);
  font-size: 1.05rem;
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.resource-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.75rem;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

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

.resource-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--color-navy);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.resource-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 0.4rem;
}

.resource-content p {
  font-size: 0.9rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.resource-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-green);
}

/* Footer */

.site-footer {
  padding: 3rem 0;
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.7);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem 2rem;
  align-items: center;
}

.footer-brand .logo-text {
  color: var(--color-white);
  font-size: 1.1rem;
}

.footer-tagline {
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--color-white);
}

.footer-copy {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Form success state */

.signup-form.is-success .form-fields {
  border-color: var(--color-green);
  background: var(--color-green-light);
}

.signup-form.is-success .form-note {
  color: var(--color-green);
  font-weight: 500;
}

/* Responsive */

@media (max-width: 900px) {
  .hero-inner,
  .about-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-visual {
    order: -1;
  }

  .visual-card {
    max-width: 100%;
  }
}

@media (max-width: 640px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .hero {
    padding: 3rem 0 4rem;
  }

  .form-fields {
    flex-direction: column;
    padding: 0.5rem;
  }

  .btn-primary {
    width: 100%;
    padding: 0.85rem;
  }

  .resource-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-nav {
    justify-content: center;
  }
}