/* ==========================================================================
   Tender Landing Page — Styles
   Mobile-first, responsive, design-system driven
   ========================================================================== */

/* --- CSS Custom Properties (Design System) --- */
:root {
  --color-primary: #1F3A5F;
  --color-accent: #C8A951;
  --color-bg: #F7F8FA;
  --color-surface: #FFFFFF;
  --color-text-primary: #111111;
  --color-text-secondary: #6B7280;
  --color-divider: #E5E7EB;
  --color-success: #2E7D32;
  --color-error: #D32F2F;
  --color-overlay: rgba(0,0,0,0.4);

  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --horizontal-padding: 24px;
  --card-padding: 16px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-soft: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-elevated: 0 4px 16px rgba(0,0,0,0.08);

  --font-family: ui-rounded, "SF Pro Rounded", "Avenir Next Rounded", "Nunito", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

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

/* Screen-reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* --- Button --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 17px;
  border-radius: var(--radius-md);
  padding: 14px 32px;
  transition: background-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: var(--shadow-soft);
}

.btn--primary:hover {
  background-color: #17304f;
}

.btn--primary:active {
  transform: scale(0.97);
}

.btn--primary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Hero Section --- */
.hero {
  background: linear-gradient(170deg, var(--color-primary) 0%, #16304e 100%);
  color: #FFFFFF;
  padding: 64px var(--horizontal-padding) 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -30%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(200,169,81,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero__container {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: rgba(200,169,81,0.15);
  color: var(--color-accent);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: var(--spacing-24);
}

.hero__title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--spacing-16);
}

.hero__subtitle {
  font-size: 16px;
  line-height: 1.6;
  color: rgba(255,255,255,0.82);
  margin-bottom: var(--spacing-32);
}

.hero__subtitle strong {
  color: var(--color-accent);
  font-weight: 700;
}

.hero__reassurance {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255,255,255,0.7);
  margin-top: var(--spacing-24);
  margin-bottom: 40px;
  padding-top: var(--spacing-24);
  border-top: 1px solid rgba(255,255,255,0.12);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  width: 100%;
  max-width: 340px;
  padding: 16px 32px;
  font-size: 17px;
  background-color: var(--color-accent);
  color: var(--color-primary);
  font-weight: 700;
  border-radius: var(--radius-md);
}

.hero__cta:hover {
  background-color: #b8993f;
}

/* --- Trust Strip --- */
.trust-strip {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--spacing-24) var(--horizontal-padding);
}

.trust-strip__container {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-16);
}

.trust-strip__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.trust-strip__icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(31,58,95,0.06);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

/* --- About / Reassurance Section --- */
.about {
  padding: 40px var(--horizontal-padding);
  border-bottom: 1px solid var(--color-divider);
}

.about__container {
  max-width: 520px;
  margin: 0 auto;
  text-align: center;
}

.about__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-16);
}

.about__text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-12);
}

.about__text:last-child {
  margin-bottom: 0;
}

/* --- Questionnaire Section --- */
.questionnaire-section {
  padding: 48px var(--horizontal-padding) 56px;
}

.questionnaire-section__container {
  max-width: 520px;
  margin: 0 auto;
  text-align: center;
}

.questionnaire-section__title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-8);
}

.questionnaire-section__subtitle {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-32);
}

/* --- Questionnaire Card --- */
.questionnaire-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-elevated);
  padding: var(--spacing-24);
  min-height: 320px;
  position: relative;
  overflow: hidden;
}

/* --- Progress --- */
.progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  margin-bottom: var(--spacing-24);
}

.progress__bar {
  flex: 1;
  height: 6px;
  background: var(--color-divider);
  border-radius: 100px;
  overflow: hidden;
  position: relative;
}

.progress__bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: var(--progress, 0%);
  background: var(--color-accent);
  border-radius: 100px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  white-space: nowrap;
  min-width: 30px;
  text-align: right;
}

.progress--hidden {
  opacity: 0;
  pointer-events: none;
}

/* --- Slides --- */
.slides {
  position: relative;
}

.slide {
  display: none;
  animation: slideIn 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide--active {
  display: block;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide__question {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-24);
  text-align: center;
}

/* --- Option Buttons --- */
.options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-12);
}

.option {
  display: block;
  width: 100%;
  padding: 15px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-primary);
  background: var(--color-bg);
  border: 2px solid var(--color-divider);
  border-radius: var(--radius-md);
  text-align: center;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.option:hover {
  border-color: var(--color-primary);
  background-color: rgba(31,58,95,0.04);
}

.option:active {
  transform: scale(0.97);
}

.option:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.option--selected {
  border-color: var(--color-primary);
  background-color: rgba(31,58,95,0.08);
  color: var(--color-primary);
}

/* --- End States --- */
.end-state {
  text-align: center;
  padding: var(--spacing-16) 0;
}

.end-state__icon {
  margin: 0 auto var(--spacing-16);
}

.end-state__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-12);
}

.end-state__title--success {
  color: var(--color-success);
}

.end-state__text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 380px;
  margin: 0 auto;
}

/* --- Email Capture --- */
.email-capture {
  text-align: center;
  padding: var(--spacing-8) 0;
}

.email-capture__icon {
  margin: 0 auto var(--spacing-16);
}

.email-capture__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-8);
}

.email-capture__text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-24);
  max-width: 380px;
  margin-left: auto;
  margin-right: auto;
}

.email-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-12);
}

.email-form__field {
  position: relative;
}

.email-form__input {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-bg);
  border: 2px solid var(--color-divider);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease;
  -webkit-appearance: none;
}

.email-form__input::placeholder {
  color: var(--color-text-secondary);
}

.email-form__input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.email-form__input--error {
  border-color: var(--color-error);
}

.email-form__error {
  font-size: 13px;
  color: var(--color-error);
  text-align: left;
  margin-top: var(--spacing-4);
  min-height: 18px;
}

.email-form__submit {
  width: 100%;
  padding: 15px;
}

.email-form__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.email-capture__privacy {
  font-size: 12px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-top: var(--spacing-16);
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}

/* --- FAQ --- */
.faq {
  padding: 40px var(--horizontal-padding) 48px;
  border-top: 1px solid var(--color-divider);
}

.faq__container {
  max-width: 560px;
  margin: 0 auto;
}

.faq__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--spacing-24);
}

.faq__item {
  border-bottom: 1px solid var(--color-divider);
}

.faq__question {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-primary);
  padding: var(--spacing-16) 0;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-12);
}

.faq__question::-webkit-details-marker {
  display: none;
}

.faq__question::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq__item[open] .faq__question::after {
  content: '−';
}

.faq__answer {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding-bottom: var(--spacing-16);
}

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: var(--spacing-32) var(--horizontal-padding);
  /* Extra bottom padding on mobile to clear sticky CTA */
  padding-bottom: 100px;
}

.footer__container {
  max-width: 600px;
  margin: 0 auto;
}

.footer__brand {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: var(--spacing-4);
}

.footer__copy {
  font-size: 13px;
}

/* --- Sticky CTA (Mobile) --- */
.sticky-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface);
  padding: var(--spacing-12) var(--horizontal-padding);
  padding-bottom: calc(var(--spacing-12) + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -2px 12px rgba(0,0,0,0.08);
  z-index: 100;
  transform: translateY(0);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.sticky-cta--hidden {
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

.sticky-cta__btn {
  width: 100%;
  padding: 15px;
  font-size: 16px;
}

/* ==========================================================================
   Desktop / Tablet Responsive
   ========================================================================== */

@media (min-width: 768px) {
  .hero {
    padding: 80px var(--horizontal-padding) 64px;
  }

  .hero__title {
    font-size: 36px;
  }

  .hero__subtitle {
    font-size: 18px;
  }

  .hero__cta {
    width: auto;
    min-width: 300px;
  }

  .trust-strip__container {
    flex-direction: row;
    justify-content: center;
    gap: var(--spacing-32);
  }

  .trust-strip__item {
    font-size: 15px;
  }

  .questionnaire-section {
    padding: 64px var(--horizontal-padding) 72px;
  }

  .questionnaire-card {
    padding: var(--spacing-32);
    min-height: 360px;
  }

  .options {
    max-width: 360px;
    margin: 0 auto;
  }

  .email-form {
    max-width: 380px;
    margin: 0 auto;
  }

  .faq {
    padding: 56px var(--horizontal-padding) 64px;
  }

  .footer {
    padding-bottom: var(--spacing-32);
  }

  /* Hide sticky CTA on desktop */
  .sticky-cta {
    display: none;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding: 100px var(--horizontal-padding) 80px;
  }

  .hero__title {
    font-size: 40px;
  }

  .hero__subtitle {
    font-size: 19px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-32);
  }

  .questionnaire-card {
    padding: 40px 48px;
  }
}