/* ============================================================
   IVTEAM Newsletter Signup — Style
   Clinical: deep navy surfaces, teal accent, clean typography
   ============================================================ */

/* --- Design Tokens --- */
:root,
[data-theme='light'] {
  /* Surfaces */
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-2: #f0f4f8;
  --color-surface-offset: #e8edf3;
  --color-divider: #d0d9e4;
  --color-border: #c8d4e0;

  /* Text */
  --color-text: #0d1b2e;
  --color-text-muted: #4a5e74;
  --color-text-faint: #92a3b5;
  --color-text-inverse: #f5f7fa;

  /* Primary Accent — clinical teal */
  --color-primary: #006b75;
  --color-primary-hover: #005260;
  --color-primary-active: #003a45;
  --color-primary-light: #e0f0f2;

  /* Navy accent (headers, hero strip) */
  --color-navy: #0d2240;
  --color-navy-mid: #1a3456;

  /* Type */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  /* Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.4rem  + 2vw,    3.2rem);
  --text-hero: clamp(2.5rem,   1.5rem  + 3.5vw,  4.5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(13, 27, 46, 0.08);
  --shadow-md: 0 4px 14px rgba(13, 27, 46, 0.10);
  --shadow-lg: 0 12px 36px rgba(13, 27, 46, 0.14);

  /* Width */
  --content-narrow: 600px;
  --content-default: 900px;
}

[data-theme='dark'] {
  --color-bg: #0c1520;
  --color-surface: #111d2e;
  --color-surface-2: #162338;
  --color-surface-offset: #1a2940;
  --color-divider: #263245;
  --color-border: #2e3e56;
  --color-text: #d8e4f0;
  --color-text-muted: #7a95af;
  --color-text-faint: #3d5469;
  --color-text-inverse: #0c1520;
  --color-primary: #3fb8c8;
  --color-primary-hover: #2fa0af;
  --color-primary-active: #1e8090;
  --color-primary-light: #0e2535;
  --color-navy: #d8e4f0;
  --color-navy-mid: #b0c8de;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0c1520;
    --color-surface: #111d2e;
    --color-surface-2: #162338;
    --color-surface-offset: #1a2940;
    --color-divider: #263245;
    --color-border: #2e3e56;
    --color-text: #d8e4f0;
    --color-text-muted: #7a95af;
    --color-text-faint: #3d5469;
    --color-text-inverse: #0c1520;
    --color-primary: #3fb8c8;
    --color-primary-hover: #2fa0af;
    --color-primary-active: #1e8090;
    --color-primary-light: #0e2535;
    --color-navy: #d8e4f0;
    --color-navy-mid: #b0c8de;
  }
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
  hanging-punctuation: first last;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
}

img, svg { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { text-wrap: balance; line-height: 1.15; }
p, li { text-wrap: pretty; }
a, button, input { transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition); }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }
::selection { background: color-mix(in oklab, var(--color-primary) 25%, transparent); color: var(--color-text); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-navy) 96%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.header-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  align-items: center;
}
.logo-link:hover { opacity: 0.85; }

.logo-svg {
  height: 44px;
  width: auto;
  display: block;
}

.footer-logo-svg {
  height: 30px;
  width: auto;
  display: block;
  opacity: 0.75;
}

.footer-logo-link {
  text-decoration: none;
  display: flex;
  align-items: center;
}
.footer-logo-link:hover .footer-logo-svg { opacity: 1; }

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: rgba(255,255,255,0.6);
  border: 1px solid rgba(255,255,255,0.15);
}
.theme-toggle:hover {
  color: #ffffff;
  background: rgba(255,255,255,0.1);
}

/* --- Hero --- */
.hero {
  background: linear-gradient(160deg, var(--color-navy) 0%, #0a3060 55%, #004e60 100%);
  color: #ffffff;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
  position: relative;
  overflow: hidden;
}

/* Subtle grid texture overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* Soft glow orb */
.hero::after {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(0, 180, 200, 0.18) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}

.hero-inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding-inline: var(--space-6);
  position: relative;
  z-index: 1;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  border: 1px solid rgba(100, 220, 230, 0.5);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(180, 240, 245, 0.9);
  margin-bottom: var(--space-6);
}

.hero-heading {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 400;
  color: #ffffff;
  margin-bottom: var(--space-6);
  line-height: 1.1;
}

.hero-heading em {
  font-style: italic;
  color: rgba(120, 220, 230, 0.92);
}

.hero-sub {
  font-size: var(--text-base);
  color: rgba(210, 225, 240, 0.85);
  max-width: 52ch;
  margin: 0 auto var(--space-10);
  line-height: 1.7;
}

/* --- Form --- */
.form-wrapper {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.08);
  text-align: left;
}

.signup-form { display: flex; flex-direction: column; gap: var(--space-5); }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-4);
}

@media (max-width: 540px) {
  .form-row { grid-template-columns: 1fr; }
}

.field-group { display: flex; flex-direction: column; gap: var(--space-2); }

.field-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}

.required { color: var(--color-primary); }

.field-input {
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: var(--text-base);
  width: 100%;
}

.field-input:hover { border-color: var(--color-primary); }
.field-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-primary) 18%, transparent);
}
.field-input::placeholder { color: var(--color-text-faint); }

.btn-subscribe {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: #ffffff;
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  width: 100%;
  letter-spacing: 0.01em;
  cursor: pointer;
}
.btn-subscribe:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-subscribe:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.form-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
}

/* --- Proof Strip --- */
.proof-strip {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
}

.proof-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.proof-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  text-align: center;
}

.proof-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  line-height: 1;
}

.proof-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.proof-divider {
  width: 1px;
  height: 40px;
  background: var(--color-divider);
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .proof-divider { display: none; }
  .proof-inner { gap: var(--space-6); }
}

/* --- Features --- */
.features {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
}

.features-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding-inline: var(--space-6);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-10);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

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

.feature-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
}

.feature-body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: none;
}

/* --- Testimonial --- */
.testimonial-section {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-surface-2) 100%);
  padding-block: clamp(var(--space-12), 6vw, var(--space-16));
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

[data-theme='dark'] .testimonial-section {
  background: linear-gradient(135deg, rgba(63,184,200,0.08) 0%, var(--color-surface) 100%);
}

.testimonial-inner {
  max-width: 640px;
  margin: 0 auto;
  padding-inline: var(--space-6);
  text-align: center;
}

.testimonial p {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-text);
  line-height: 1.6;
  max-width: 52ch;
  margin: 0 auto var(--space-6);
}

.testimonial p::before { content: '\201C'; }
.testimonial p::after  { content: '\201D'; }

.testimonial-footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.testimonial-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-org {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* --- Bottom CTA --- */
.cta-bottom {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  text-align: center;
}

.cta-inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding-inline: var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}

.cta-heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
}

.cta-sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 42ch;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  padding: var(--space-4) var(--space-10);
  background: var(--color-primary);
  color: #ffffff;
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.btn-cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-cta:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-navy);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-block: var(--space-8);
}

.footer-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  padding-inline: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-brand { display: flex; align-items: center; }
.footer-logo { width: 88px; height: auto; color: var(--color-text-muted); }

.footer-nav {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}
.footer-nav a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
  text-decoration: none;
}
.footer-nav a:hover { color: rgba(255,255,255,0.9); }

.footer-copy {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.3);
}

@media (max-width: 600px) {
  .footer-inner { flex-direction: column; align-items: flex-start; }
}