/* ============================================
   FitForce Landing Page — style.css
   Mobile-first responsive design
   ============================================ */

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

:root {
  --color-primary: #6D28D9;
  --color-primary-dark: #5B21B6;
  --color-primary-light: #A78BFA;
  --color-accent: #F97316;
  --color-accent-light: #FB923C;
  --gradient-brand: linear-gradient(135deg, #F97316 0%, #E11D48 40%, #7C3AED 100%);
  --gradient-brand-subtle: linear-gradient(135deg, rgba(249,115,22,0.12) 0%, rgba(124,58,237,0.12) 100%);
  --gradient-dark: linear-gradient(135deg, #0F0A1A 0%, #1A1145 50%, #0D1117 100%);
  --color-bg: #FAFAFA;
  --color-bg-alt: #F3F4F6;
  --color-bg-dark: #0F0A1A;
  --color-text: #18181B;
  --color-text-light: #52525B;
  --color-text-inverse: #FFFFFF;
  --color-border: #E4E4E7;
  --color-success: #059669;
  --color-error: #DC2626;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px -8px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 40px rgba(124,58,237,0.15);
  --shadow-glow-accent: 0 0 40px rgba(249,115,22,0.15);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input { font: inherit; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.hide-mobile { display: none; }

/* --- Gradient text utility --- */
.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
  position: relative;
}

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

.btn--primary {
  background: var(--gradient-brand);
  background-size: 150% 150%;
  color: var(--color-text-inverse);
  padding: 14px 28px;
  font-size: 1rem;
  border: none;
}

.btn--primary:hover {
  background-size: 200% 200%;
  box-shadow: 0 8px 24px rgba(124,58,237,0.3), 0 4px 12px rgba(249,115,22,0.2);
  transform: translateY(-1px);
}

.btn--sm {
  padding: 10px 22px;
  font-size: 0.875rem;
}

.btn--nav {
  background: var(--gradient-brand);
  background-size: 150% 150%;
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
}

.btn--nav:hover {
  background-size: 200% 200%;
  box-shadow: 0 4px 16px rgba(124,58,237,0.3);
  transform: translateY(-1px);
}

.btn--form {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  flex-shrink: 0;
}

.btn__loading { display: none; }
.btn.is-loading .btn__text { display: none; }
.btn.is-loading .btn__loading { display: flex; }

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250,250,250,0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  transition: box-shadow var(--transition), background var(--transition);
}

.nav.is-scrolled {
  box-shadow: 0 1px 24px rgba(0,0,0,0.06);
  background: rgba(250,250,250,0.95);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text);
}

.nav__logo-icon { flex-shrink: 0; }

/* --- Hero --- */
.hero {
  padding: 120px 0 80px;
  text-align: center;
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

/* Subtle dot grid pattern */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(124,58,237,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black 20%, transparent 70%);
  pointer-events: none;
}

/* Gradient orbs */
.hero::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  top: -200px;
  right: -200px;
  background: radial-gradient(circle, rgba(249,115,22,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(249,115,22,0.08));
  border: 1px solid rgba(124,58,237,0.15);
  border-radius: var(--radius-full);
  margin-bottom: 28px;
  letter-spacing: 0.01em;
}

.hero__badge::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--color-text);
  margin-bottom: 20px;
}

.hero__title-accent {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
  margin-bottom: 40px;
  line-height: 1.75;
}

.hero__form {
  max-width: 480px;
  margin: 0 auto;
}

.form-group {
  display: flex;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  background: #fff;
}

.form__input {
  flex: 1;
  min-width: 0;
  padding: 16px 20px;
  font-size: 1rem;
  border: 2px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
  background: #fff;
}

.form__input:focus {
  border-color: var(--color-primary-light);
}

.form__message {
  margin-top: 12px;
  font-size: 0.875rem;
  min-height: 1.4em;
}

.form__message--success { color: var(--color-success); font-weight: 500; }
.form__message--error { color: var(--color-error); font-weight: 500; }

.hero__proof {
  margin-top: 24px;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* --- Section Header --- */
.section-header {
  text-align: center;
  max-width: 580px;
  margin: 0 auto 56px;
}

.section-header__title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
}

.section-header__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- Features --- */
.features {
  padding: 80px 0;
  background: var(--color-bg-alt);
  position: relative;
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.feature-card {
  padding: 32px 28px;
  border-radius: var(--radius-md);
  background: #fff;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

/* Gradient top border accent */
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  position: relative;
}

.feature-card__icon--clients {
  background: linear-gradient(135deg, #EEF2FF, #E0E7FF);
  color: #4F46E5;
}
.feature-card__icon--health {
  background: linear-gradient(135deg, #FFF7ED, #FFEDD5);
  color: #EA580C;
}
.feature-card__icon--ai {
  background: linear-gradient(135deg, #F5F3FF, #EDE9FE);
  color: #7C3AED;
}
.feature-card__icon--shield {
  background: linear-gradient(135deg, #ECFDF5, #D1FAE5);
  color: #059669;
}
.feature-card__icon--finance {
  background: linear-gradient(135deg, #ECFEFF, #CFFAFE);
  color: #0891B2;
}
.feature-card__icon--certs {
  background: linear-gradient(135deg, #FFF1F2, #FFE4E6);
  color: #E11D48;
}

/* --- Feature Card Highlight --- */
.feature-card--highlight {
  border-color: transparent;
  background:
    linear-gradient(#fff, #fff) padding-box,
    var(--gradient-brand) border-box;
  border: 2px solid transparent;
  box-shadow: var(--shadow-md), 0 0 24px rgba(124,58,237,0.08);
}

.feature-card--highlight::before {
  opacity: 1;
}

.feature-card--highlight:hover {
  box-shadow: var(--shadow-lg), 0 0 32px rgba(124,58,237,0.14);
}

.feature-card__badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: linear-gradient(135deg, rgba(124,58,237,0.1), rgba(249,115,22,0.1));
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

/* --- Feature Groups --- */
.features__group {
  margin-bottom: 48px;
}

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

.features__group-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text-light);
  margin-bottom: 20px;
  padding-left: 4px;
}

.feature-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card__text {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- How It Works --- */
.how-it-works {
  padding: 80px 0;
  background: var(--color-bg);
  position: relative;
}

.steps {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.step {
  text-align: center;
  max-width: 340px;
}

.step__number {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-brand);
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(124,58,237,0.25);
}

.step__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.step__text {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.step__connector {
  width: 2px;
  height: 44px;
  background: linear-gradient(to bottom, var(--color-primary-light), var(--color-accent-light));
  margin: 8px 0;
  border-radius: 1px;
  opacity: 0.4;
}

/* --- Stats --- */
.stats {
  padding: 80px 0;
  background: var(--gradient-dark);
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}

/* Subtle grid overlay */
.stats::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124,58,237,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* Gradient orb */
.stats::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  bottom: -250px;
  left: -100px;
  background: radial-gradient(circle, rgba(249,115,22,0.1) 0%, transparent 60%);
  pointer-events: none;
}

.stats__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 24px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.stats .section-header {
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
}

.stats .section-header__title {
  color: var(--color-text-inverse);
}

.stats .section-header__subtitle {
  color: rgba(255,255,255,0.65);
}

.stat__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.08);
  color: var(--color-accent-light);
}

.stat__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text-inverse);
}

.stat__number {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat__label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.55;
}

/* --- FAQ --- */
.faq {
  padding: 80px 0;
  background: var(--color-bg);
}

.faq__list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #fff;
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.faq__item:hover {
  border-color: rgba(124,58,237,0.2);
  box-shadow: var(--shadow-sm);
}

.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  color: var(--color-text);
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  line-height: 1.5;
}

.faq__chevron {
  flex-shrink: 0;
  color: var(--color-text-light);
  transition: transform var(--transition);
}

.faq__question[aria-expanded="true"] .faq__chevron {
  transform: rotate(180deg);
}

.faq__answer {
  padding: 0 24px 20px;
}

.faq__answer p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* Stagger FAQ animations */
.faq__item:nth-child(2)[data-animate] { transition-delay: 0.06s; }
.faq__item:nth-child(3)[data-animate] { transition-delay: 0.12s; }
.faq__item:nth-child(4)[data-animate] { transition-delay: 0.18s; }
.faq__item:nth-child(5)[data-animate] { transition-delay: 0.24s; }
.faq__item:nth-child(6)[data-animate] { transition-delay: 0.3s; }

/* --- Final CTA --- */
.final-cta {
  padding: 80px 0;
  background: var(--gradient-dark);
  text-align: center;
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}

/* Top gradient line separator */
.final-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
}

/* Glow orb */
.final-cta::after {
  content: '';
  position: absolute;
  width: 800px;
  height: 400px;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(124,58,237,0.12) 0%, transparent 60%);
  pointer-events: none;
}

.final-cta__inner {
  max-width: 620px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.final-cta__title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.final-cta__subtitle {
  font-size: 1.05rem;
  opacity: 0.75;
  margin-bottom: 40px;
  line-height: 1.7;
}

.final-cta .form-group {
  box-shadow: 0 12px 40px rgba(0,0,0,0.3), 0 0 60px rgba(124,58,237,0.1);
  background: rgba(255,255,255,0.08);
}

.final-cta .form__input {
  border-color: rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.06);
  color: #fff;
}

.final-cta .form__input::placeholder {
  color: rgba(255,255,255,0.4);
}

.final-cta .form__input:focus {
  border-color: rgba(124,58,237,0.5);
}

.final-cta .btn--primary {
  background: var(--gradient-brand);
}

.final-cta .form__message--success { color: #6EE7B7; }
.final-cta .form__message--error { color: #FCA5A5; }

/* --- Footer --- */
.footer {
  padding: 48px 0 32px;
  background: #080510;
  color: rgba(255,255,255,0.45);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer__brand .nav__logo {
  color: #fff;
  margin-bottom: 8px;
}

.footer__tagline {
  font-size: 0.9rem;
}

.footer__links {
  display: flex;
  gap: 24px;
  font-size: 0.9rem;
}

.footer__links a {
  transition: color var(--transition);
}

.footer__links a:hover {
  color: #fff;
}

.footer__bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.8rem;
}

/* --- Animate on scroll --- */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger animation delay for feature cards within each group */
.features__grid .feature-card:nth-child(2)[data-animate] { transition-delay: 0.08s; }
.features__grid .feature-card:nth-child(3)[data-animate] { transition-delay: 0.16s; }
.features__grid .feature-card:nth-child(4)[data-animate] { transition-delay: 0.24s; }

.step:nth-child(3)[data-animate] { transition-delay: 0.1s; }
.step:nth-child(5)[data-animate] { transition-delay: 0.2s; }

.stat:nth-child(2)[data-animate] { transition-delay: 0.08s; }
.stat:nth-child(3)[data-animate] { transition-delay: 0.16s; }
.stat:nth-child(4)[data-animate] { transition-delay: 0.24s; }

/* ============================================
   Responsive Breakpoints
   ============================================ */

/* Tablet (640px+) */
@media (min-width: 640px) {
  .container { padding: 0 32px; }
  .hide-mobile { display: inline; }

  .hero { padding: 140px 0 100px; }
  .hero__title { font-size: 3.2rem; }

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

  .features__grid--training {
    grid-template-columns: 1fr 1fr;
  }

  .steps {
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
  }

  .step__connector {
    width: 60px;
    height: 2px;
    margin: 26px 0 0;
    align-self: flex-start;
    background: linear-gradient(to right, var(--color-primary-light), var(--color-accent-light));
  }

  .stats__grid { grid-template-columns: repeat(4, 1fr); }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .hero__title { font-size: 3.75rem; }
  .hero__subtitle { font-size: 1.2rem; }

  .features { padding: 100px 0; }
  .how-it-works { padding: 100px 0; }
  .stats { padding: 100px 0; }
  .faq { padding: 100px 0; }
  .final-cta { padding: 100px 0; }

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

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

  .section-header__title { font-size: 2.5rem; }
  .final-cta__title { font-size: 2.5rem; }

  .step__connector { width: 80px; }
}