/* ==========================================================================
   MailMERC — Main Stylesheet
   Enterprise email security gateway | Mobile-first, system fonts, no dependencies
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Brand Colors */
  --color-primary: #0077b6;
  --color-primary-dark: #005f8f;
  --color-primary-light: #e0f2f9;
  --color-dark: #454545;
  --color-medium: #656565;
  --color-light: #9e9e9e;
  --color-white: #ffffff;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fa;
  --color-bg-dark: #e8edf2;
  --color-border: #dce3ea;
  --color-success: #27ae60;
  --color-error: #e74c3c;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  --font-size-4xl: 2.5rem;    /* 40px */
  --font-size-5xl: 3rem;      /* 48px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 5rem;     /* 80px */

  /* Layout */
  --container-max: 1140px;
  --container-padding: var(--space-lg);
  --header-height: 72px;

  /* Borders & Shadows */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Breakpoints */
  --bp-mobile: 768px;
  --bp-tablet: 1024px;
}

/* --------------------------------------------------------------------------
   2. Reset & Normalize
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
  color: var(--color-dark);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-dark);
  margin-bottom: var(--space-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--space-md);
  color: var(--color-medium);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

/* --------------------------------------------------------------------------
   3. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--dark {
  background-color: var(--color-bg-dark);
}

.section__header {
  text-align: center;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-2xl);
}

.section__title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-medium);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

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

.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo img,
.header__logo svg {
  height: 50px;
  width: auto;
}

/* Navigation Links */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-dark);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

/* Header CTA Button */
.header__cta {
  margin-left: var(--space-md);
}

/* Mobile Menu Toggle (Checkbox Hack) */
.nav__toggle {
  display: none;
}

.nav__toggle-label {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  padding: 2px;
}

.nav__toggle-label span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-dark);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* --------------------------------------------------------------------------
   5. Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  text-decoration: none;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

/* Primary — filled blue */
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

/* Secondary — outlined */
.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

/* Ghost — transparent with hover fill */
.btn--ghost {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn--ghost:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

/* Sizes */
.btn--sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-xs);
}

.btn--lg {
  padding: 0.875rem 2rem;
  font-size: var(--font-size-base);
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-4xl);
  text-align: center;
  background: linear-gradient(
    160deg,
    var(--color-bg-alt) 0%,
    var(--color-white) 40%,
    var(--color-primary-light) 100%
  );
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(34, 155, 217, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(34, 155, 217, 0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero__badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-dark);
  line-height: 1.2;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-medium);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

/* --------------------------------------------------------------------------
   7. Trust Bar
   -------------------------------------------------------------------------- */
.trust-bar {
  padding: var(--space-xl) var(--container-padding);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.trust-bar__text {
  font-size: var(--font-size-sm);
  color: var(--color-light);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   8. Card Components
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-base),
              transform var(--transition-base),
              border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-light);
  margin-bottom: var(--space-lg);
  flex-shrink: 0;
}

.card__icon svg {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-sm);
}

.card__text {
  font-size: var(--font-size-sm);
  color: var(--color-medium);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* Card Grid */
.card-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

/* --------------------------------------------------------------------------
   9. How It Works — Numbered Steps
   -------------------------------------------------------------------------- */
.steps {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  counter-reset: step;
}

.step {
  position: relative;
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.step:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

.step__content {
  flex: 1;
}

.step__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-xs);
}

.step__text {
  font-size: var(--font-size-sm);
  color: var(--color-medium);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* Connector line between steps (desktop) */
.step:not(:first-child)::after {
  display: block;
  content: "";
  position: absolute;
  top: calc(-1 * (var(--space-xl) + 10px));
  left: 50%;
  width: 2px;
  height: calc(var(--space-xl) + 20px);
  transform: translateX(-50%);
  background: repeating-linear-gradient(
    to bottom,
    var(--color-primary) 0px,
    var(--color-primary) 2px,
    transparent 2px,
    transparent 5px
  );
}

/* --------------------------------------------------------------------------
   10. Feature Grid
   -------------------------------------------------------------------------- */
.feature-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

.feature-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-base),
              transform var(--transition-base),
              border-color var(--transition-base);
}

.feature-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.feature-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-light);
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 0;
}

.feature-card__text {
  font-size: var(--font-size-sm);
  color: var(--color-medium);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   11. CTA Section
   -------------------------------------------------------------------------- */
.cta-section {
  padding: var(--space-4xl) 0;
  text-align: center;
  background: linear-gradient(
    160deg,
    var(--color-primary) 0%,
    var(--color-primary-dark) 100%
  );
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-section__title {
  font-size: var(--font-size-2xl);
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.cta-section__text {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* --------------------------------------------------------------------------
   12. Contact Form
   -------------------------------------------------------------------------- */
.contact-layout {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
}

.contact-form {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.contact-form__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
}

.form-label--required::after {
  content: " *";
  color: var(--color-error);
}

.form-input,
.form-textarea,
.form-select {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-base);
  color: var(--color-dark);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-light);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(34, 155, 217, 0.15);
}

.form-input--error,
.form-textarea--error {
  border-color: var(--color-error);
}

.form-input--error:focus,
.form-textarea--error:focus {
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.15);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

.form-error {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-xs);
}

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

.form-submit {
  margin-top: var(--space-md);
}

/* Contact form status messages */
.contact-status {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.contact-status ul {
  margin: 0;
  padding-left: var(--space-md);
}

.contact-status--success {
  background-color: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.contact-status--error {
  background-color: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* Honeypot — hidden off-screen */
.form-group--honeypot {
  position: absolute;
  left: -9999px;
  top: -9999px;
  opacity: 0;
  height: 0;
  overflow: hidden;
  pointer-events: none;
}

/* Contact Info Sidebar */
.contact-info {
  padding: var(--space-xl) 0;
}

.contact-info__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-lg);
}

.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.contact-info__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-light);
}

.contact-info__icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

.contact-info__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-dark);
  margin-bottom: 2px;
}

.contact-info__value {
  font-size: var(--font-size-sm);
  color: var(--color-medium);
}

.contact-info__value a {
  color: var(--color-primary);
}

.contact-info__value a:hover {
  text-decoration: underline;
}

.contact-info__note {
  margin-top: var(--space-xl);
  padding: var(--space-md);
  background-color: var(--color-primary-light);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-primary-dark);
}

/* --------------------------------------------------------------------------
   13. Page Header (Features / Contact top banners)
   -------------------------------------------------------------------------- */
.page-header {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  text-align: center;
  background: linear-gradient(
    160deg,
    var(--color-bg-alt) 0%,
    var(--color-white) 60%,
    var(--color-primary-light) 100%
  );
}

.page-header__title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

.page-header__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-medium);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   14. Technical Strengths Section
   -------------------------------------------------------------------------- */
.tech-strengths {
  background-color: var(--color-bg-alt);
}

.tech-strengths__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

.tech-strengths__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.tech-strengths__check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  background-color: var(--color-success);
}

.tech-strengths__check svg {
  width: 16px;
  height: 16px;
  color: var(--color-white);
}

.tech-strengths__text {
  font-size: var(--font-size-sm);
  color: var(--color-medium);
  line-height: var(--line-height-relaxed);
  margin-bottom: 0;
}

.tech-strengths__text strong {
  color: var(--color-dark);
}

/* --------------------------------------------------------------------------
   15. Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-2xl) 0;
  background-color: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
  text-align: center;
}

.footer__logo img,
.footer__logo svg {
  height: 40px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.8;
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-xl);
  justify-content: center;
}

.footer__link {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__divider {
  width: 100%;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.15);
}

.footer__copyright {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
}

/* --------------------------------------------------------------------------
   16. Utility Classes
   -------------------------------------------------------------------------- */
/* Text */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-dark { color: var(--color-dark); }
.text-medium { color: var(--color-medium); }
.text-light { color: var(--color-light); }
.text-white { color: var(--color-white); }

/* Spacing */
.mt-xs { margin-top: var(--space-xs); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

.mb-xs { margin-bottom: var(--space-xs); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.pt-xs { padding-top: var(--space-xs); }
.pt-sm { padding-top: var(--space-sm); }
.pt-md { padding-top: var(--space-md); }
.pt-lg { padding-top: var(--space-lg); }
.pt-xl { padding-top: var(--space-xl); }

.pb-xs { padding-bottom: var(--space-xs); }
.pb-sm { padding-bottom: var(--space-sm); }
.pb-md { padding-bottom: var(--space-md); }
.pb-lg { padding-bottom: var(--space-lg); }
.pb-xl { padding-bottom: var(--space-xl); }

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* Misc */
.u-hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.rounded { border-radius: var(--radius-md); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }

/* --------------------------------------------------------------------------
   17. Responsive — Tablet (min-width: 768px)
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  /* Typography */
  h1 { font-size: var(--font-size-4xl); }
  h2 { font-size: var(--font-size-3xl); }

  .hero__title {
    font-size: var(--font-size-4xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-xl);
  }

  .section__title {
    font-size: var(--font-size-3xl);
  }

  .page-header__title {
    font-size: var(--font-size-4xl);
  }

  /* Layout */
  .section {
    padding-top: var(--space-4xl);
    padding-bottom: var(--space-4xl);
  }

  /* Cards */
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Steps */
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Feature grid */
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact */
  .contact-layout {
    grid-template-columns: 2fr 1fr;
  }

  .contact-info {
    padding-top: 0;
  }

  .form-row {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Footer */
  .footer__inner {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    text-align: center;
  }

  .footer__logo,
  .footer__nav {
    flex: 0 0 auto;
  }

  .footer__logo {
    margin-right: auto;
  }

  .footer__nav {
    margin-left: auto;
  }

  .footer__divider {
    order: 3;
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
  }

  .footer__copyright {
    order: 4;
  }
}

/* --------------------------------------------------------------------------
   18. Responsive — Desktop (min-width: 1024px)
   -------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  /* Typography */
  h1 { font-size: var(--font-size-5xl); }
  h2 { font-size: var(--font-size-3xl); }

  .hero__title {
    font-size: var(--font-size-5xl);
  }

  .section__title {
    font-size: var(--font-size-3xl);
  }

  .page-header__title {
    font-size: var(--font-size-4xl);
  }

  .cta-section__title {
    font-size: var(--font-size-3xl);
  }

  /* Hero */
  .hero {
    padding-top: calc(var(--header-height) + var(--space-4xl));
    padding-bottom: var(--space-4xl);
  }

  /* Cards */
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .card {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-md);
  }

  .card__icon {
    margin-bottom: 0;
  }

  .card__title {
    flex: 1 0 calc(100% - 80px);
    margin-bottom: 0;
  }

  .card__text {
    width: 100%;
    margin-top: var(--space-sm);
  }

  /* Steps — horizontal layout */
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .step {
    flex-direction: column;
    text-align: center;
    align-items: center;
    padding: var(--space-xl) var(--space-lg);
  }

  /* Connector lines between steps */
  .step:not(:first-child)::after {
    display: block;
    content: "";
    position: absolute;
    top: 50%;
    left: calc(-1 * var(--space-xl) - 10px);
    width: calc(var(--space-xl) + 20px);
    height: 2px;
    transform: translateY(-50%);
    background: repeating-linear-gradient(
      to right,
      var(--color-primary) 0px,
      var(--color-primary) 2px,
      transparent 2px,
      transparent 5px
    );
  }

  /* Feature grid */
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Tech strengths */
  .tech-strengths__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact */
  .contact-layout {
    grid-template-columns: 1.2fr 1fr;
  }

  .contact-info {
    padding-top: 0;
  }
}

/* --------------------------------------------------------------------------
   19. Responsive — Mobile Card Tweaks (max-width: 767px)
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
  /* Shrink benefit-card icons to save vertical space */
  .card__icon {
    width: 44px;
    height: 44px;
    margin-left: auto;
    margin-right: auto;
  }

  .card__icon svg {
    width: 22px;
    height: 22px;
  }

  /* Center benefit-card content on mobile */
  .card {
    text-align: center;
  }

  /* Shrink feature-card icons to give headings more horizontal room */
  .feature-card__icon {
    width: 36px;
    height: 36px;
  }

  .feature-card__icon svg {
    width: 18px;
    height: 18px;
  }
}

/* --------------------------------------------------------------------------
   20. Responsive — Mobile Navigation (max-width: 767px)
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
  .nav__toggle-label {
    display: flex;
  }

  .nav__list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background-color: var(--color-white);
    padding: var(--space-xl) var(--space-lg);
    gap: 0;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
    z-index: 999;
  }

  .nav__link {
    display: block;
    padding: var(--space-md) 0;
    font-size: var(--font-size-lg);
    border-bottom: 1px solid var(--color-border);
  }

  .nav__link::after {
    display: none;
  }

  /* Hide CTA from the header bar on mobile */
  .header__cta {
    display: none;
  }

  /* Show CTA inside the slide-out menu when open */
  .nav__toggle:checked ~ .nav .header__cta {
    display: block;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-xl) var(--space-lg);
    margin: 0;
    width: 100%;
    box-sizing: border-box;
    background-color: var(--color-white);
  }

  .nav__toggle:checked ~ .nav .header__cta .btn {
    width: 100%;
  }

  /* Hamburger animation when open */
  .nav__toggle:checked ~ .nav .nav__list {
    transform: translateX(0);
  }

  .nav__toggle:checked ~ .nav__toggle-label span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav__toggle:checked ~ .nav__toggle-label span:nth-child(2) {
    opacity: 0;
  }

  .nav__toggle:checked ~ .nav__toggle-label span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Body scroll lock when nav is open */
  body.nav-open {
    overflow: hidden;
  }
}

/* --------------------------------------------------------------------------
   21. Print Styles
   -------------------------------------------------------------------------- */
@media print {
  .header,
  .footer,
  .hero__actions,
  .cta-section,
  .btn {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .section {
    padding: 1rem 0;
  }
}

/* --------------------------------------------------------------------------
   22. Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --------------------------------------------------------------------------
   23. Fade-In Animations
   -------------------------------------------------------------------------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-visible {
  opacity: 1;
  transform: translateY(0);
}