/* style.css — Corvus QOS Design System + Components */

/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  /* Type Scale (fluid) */
  --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,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing (4px base) */
  --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;
  --space-32: 8rem;

  /* Fonts */
  --font-display: 'Space Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Inter', 'Helvetica Neue', sans-serif;

  /* Surfaces — zinc palette (dark only) */
  --color-bg:        #09090B;
  --color-surface:   #18181B;
  --color-surface-2: #27272A;
  --color-border:    #3F3F46;

  /* Text */
  --color-text:       #FAFAFA;
  --color-text-muted: #A1A1AA;
  --color-text-faint: #71717A;

  /* Accents */
  --color-primary: #FFFFFF;
  --color-violet:  #8B5CF6;
  --color-success: #22C55E;
  --color-error:   #EF4444;

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

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

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 1100px;
  --content-wide: 1200px;
}


/* ============================================
   GLOBAL ELEMENTS
   ============================================ */
.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-8); }
}

/* Divider */
.divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
}

/* Section headers */
.section-header {
  margin-bottom: var(--space-12);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.section-subtitle {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 50ch;
}


/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

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

.btn-primary {
  background: var(--color-primary);
  color: #09090B;
  border: 1px solid var(--color-primary);
  font-weight: 500;
}

.btn-primary:hover {
  background: #E4E4E7;
  border-color: #E4E4E7;
  transform: translateY(-1px);
}

.btn-primary:active {
  background: #D4D4D8;
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface-2);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

.btn-secondary:active {
  background: var(--color-surface);
  transform: translateY(0);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}


/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-interactive),
              background var(--transition-interactive);
}

.nav--scrolled {
  border-bottom-color: rgba(255, 255, 255, 0.06);
  background: rgba(9, 9, 11, 0.92);
}

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

@media (min-width: 768px) {
  .nav__inner { padding-inline: var(--space-8); }
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  transition: opacity var(--transition-interactive);
}

.nav__logo:hover { opacity: 0.8; }

.nav__logo-qos {
  color: var(--color-violet);
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .nav__links { display: flex; }
}

.nav__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
  cursor: pointer;
}

.nav__link:hover {
  color: var(--color-text);
}

/* Hamburger */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav__hamburger { display: none; }
}

.nav__hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-interactive),
              opacity var(--transition-interactive);
}

.nav__hamburger--open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger--open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger--open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav__mobile {
  display: none;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6) var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.nav__mobile--open {
  display: flex;
}

@media (min-width: 768px) {
  .nav__mobile { display: none !important; }
}

.nav__mobile-link {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) 0;
  transition: color var(--transition-interactive);
}

.nav__mobile-link:hover {
  color: var(--color-text);
}


/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  padding-top: clamp(var(--space-32), 15vh, 12rem);
  padding-bottom: clamp(var(--space-16), 8vh, var(--space-24));
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-8);
}

.hero__badge span {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-3xl);
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 16ch;
  margin-inline: auto;
}

.hero__subtitle {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}

/* Hero form */
.hero__form {
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: var(--space-12);
}

.hero__input-group {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

@media (max-width: 600px) {
  .hero__input-group {
    flex-direction: column;
  }
}

.hero__input {
  flex: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  font-size: var(--text-base);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.hero__input::placeholder {
  color: var(--color-text-faint);
}

.hero__input:focus {
  outline: none;
  border-color: var(--color-violet);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

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

.hero__success {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-success);
  text-align: center;
  min-height: 1.5em;
}

/* Hero metrics */
.hero__metrics {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

@media (max-width: 600px) {
  .hero__metrics {
    flex-direction: column;
    gap: var(--space-4);
  }
  .hero__metric-divider { display: none; }
}

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

.hero__metric-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
}

.hero__metric-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.hero__metric-divider {
  width: 1px;
  height: 32px;
  background: rgba(255, 255, 255, 0.08);
}


/* ============================================
   PROCESS SECTION
   ============================================ */
.process {
  padding: clamp(var(--space-16), 8vh, var(--space-24)) 0;
}

.process__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .process__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-10);
  }
}

.process__step {
  padding: var(--space-6);
}

.process__number {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: rgba(255, 255, 255, 0.08);
  display: block;
  margin-bottom: var(--space-4);
  line-height: 1;
}

.process__step-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.process__step-desc {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.process__footer {
  text-align: center;
}

.process__footer .divider {
  margin-bottom: var(--space-8);
}

.process__footer-text {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  max-width: 100%;
}

.process__footer-text strong {
  color: var(--color-text);
  font-weight: 500;
}


/* ============================================
   CASE STUDY / WORK SECTION
   ============================================ */
.work {
  padding: clamp(var(--space-16), 8vh, var(--space-24)) 0;
}

.work__card {
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  overflow: hidden;
}

@media (max-width: 767px) {
  .work__card { padding: var(--space-5); }
}

.work__context {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 72ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

/* Browser mockup comparison */
.work__comparison {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .work__comparison {
    grid-template-columns: 1fr 1fr;
  }
}

.work__browser {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: var(--color-surface-2);
}

.work__browser-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.work__browser-dots {
  display: flex;
  gap: var(--space-2);
}

.work__browser-dots span {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
}

.work__browser-label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.work__browser-content {
  background: #111;
}

.work__browser-content img {
  width: 100%;
  height: auto;
  display: block;
}

/* Score section */
.work__score {
  display: flex;
  justify-content: center;
}

.work__score-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.work__score-label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.work__score-values {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.work__score-before {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-error);
}

.work__score-after {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-success);
}

.work__score-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  color: var(--color-violet);
}


/* ============================================
   PRICING SECTION
   ============================================ */
.pricing {
  padding: clamp(var(--space-16), 8vh, var(--space-24)) 0;
}

.pricing__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 768px) {
  .pricing__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pricing__card {
  background: var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing__card--featured {
  border-color: rgba(255, 255, 255, 0.12);
}

@media (min-width: 768px) {
  .pricing__card--featured {
    transform: scale(1.03);
  }
}

.pricing__card-badge {
  position: absolute;
  top: calc(var(--space-4) * -1 + var(--space-1));
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-violet);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 500;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.pricing__card-header {
  margin-bottom: var(--space-6);
}

.pricing__card-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.pricing__card-price {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.pricing__amount {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-text);
}

.pricing__period {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}

.pricing__card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.pricing__features {
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex-grow: 1;
}

.pricing__features li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding-left: var(--space-6);
  position: relative;
  line-height: 1.5;
}

.pricing__features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23A1A1AA' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
}

.pricing__cta {
  width: 100%;
  text-align: center;
  margin-top: auto;
}


/* ============================================
   CTA SECTION
   ============================================ */
.cta {
  padding: clamp(var(--space-16), 8vh, var(--space-24)) 0;
}

.cta__inner {
  text-align: center;
}

.cta__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.cta__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
  margin-inline: auto;
}

.cta__form {
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 0;
}


/* ============================================
   FOOTER
   ============================================ */
.footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--space-8) 0;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}

.footer__email {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer__email:hover {
  color: var(--color-text-muted);
}


/* ============================================
   SCROLL REVEAL (opacity only — no translateY)
   ============================================ */
.reveal {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .reveal--visible {
    opacity: 1;
  }
}