/* ============================================================
   Sonu Landing Page — Design Tokens & Styles
   Self-contained. Zero external dependencies.
   ============================================================ */

:root {
  --color-primary: #030213;
  --color-primary-fg: #ffffff;
  --color-background: #ffffff;
  --color-foreground: #0a0a0b;
  --color-muted: #ececf0;
  --color-muted-fg: #717182;
  --color-accent: #e9ebef;
  --color-border: rgba(0, 0, 0, 0.1);
  --color-destructive: #d4183d;
  --color-surface: #f7f7f9;

  --color-chatgpt: #10a37f;
  --color-claude: #d97706;
  --color-gemini: #4285f4;
  --color-perplexity: #8b5cf6;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;

  --w-max: 1152px;
  --radius: 10px;
  --radius-lg: 14px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-foreground);
  background: var(--color-background);
  line-height: 1.6;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* ---- Utilities ---- */
.container {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 1.5rem;
}

.section--muted {
  background: color-mix(in srgb, var(--color-muted) 30%, transparent);
}

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

.text-center {
  text-align: center;
}

.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;
}

/* ---- Typography ---- */
h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 500;
  line-height: 1.1;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-primary);
}

h3 {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-primary);
}

.subheadline {
  font-size: 1.125rem;
  color: var(--color-muted-fg);
  max-width: 40rem;
}

.section-intro {
  font-size: 1rem;
  color: var(--color-muted-fg);
  max-width: 40rem;
  margin: 0 auto;
}

.eyebrow {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted-fg);
  margin-bottom: 0.75rem;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  transition: opacity 0.15s, background 0.15s, transform 0.1s;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-fg);
}

.btn--primary:hover {
  opacity: 0.9;
}

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

.btn--secondary:hover {
  background: var(--color-accent);
}

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

.btn--white:hover {
  opacity: 0.92;
}

.btn-arrow {
  transition: transform 0.15s;
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav__link {
  font-size: 0.875rem;
  color: var(--color-foreground);
  transition: color 0.15s;
}

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

.nav__cta {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* ---- Hero ---- */
.hero {
  padding: 8rem 1.5rem 6rem;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.hero__blob {
  position: absolute;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.25;
}

.hero__blob--1 {
  top: 20%;
  left: 20%;
  background: var(--color-accent);
}

.hero__blob--2 {
  bottom: 20%;
  right: 20%;
  background: var(--color-muted);
}

.hero__content {
  max-width: 48rem;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.hero .subheadline {
  margin: 0 auto 2.5rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.hero__mockup {
  margin-top: 4rem;
  position: relative;
}

.hero__mockup-fade {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 8rem;
  background: linear-gradient(to top, var(--color-background), transparent);
  z-index: 2;
  pointer-events: none;
}

/* ---- Dashboard Mockup ---- */
.mockup {
  width: 100%;
  border-radius: 0.75rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  background: var(--color-background);
}

.mockup__chrome {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: #f0f0f2;
  border-bottom: 1px solid var(--color-border);
}

.mockup__dots {
  display: flex;
  gap: 0.375rem;
}

.mockup__dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
}

.mockup__dot--red { background: #ff5f57; }
.mockup__dot--yellow { background: #febc2e; }
.mockup__dot--green { background: #28c840; }

.mockup__url {
  flex: 1;
  display: flex;
  justify-content: center;
}

.mockup__url-bar {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.6875rem;
  color: var(--color-muted-fg);
}

.mockup__body {
  display: flex;
  min-height: 320px;
}

.mockup__sidebar {
  width: 10rem;
  background: var(--color-primary);
  padding: 1.25rem 0.75rem;
  flex-shrink: 0;
}

.mockup__sidebar-logo {
  font-size: 0.875rem;
  font-weight: 500;
  color: white;
  padding: 0 0.5rem;
  margin-bottom: 1.5rem;
}

.mockup__sidebar-item {
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.4);
  padding: 0.375rem 0.5rem;
  border-radius: 0.375rem;
  margin-bottom: 0.125rem;
}

.mockup__sidebar-item--active {
  color: white;
  background: rgba(255, 255, 255, 0.1);
}

.mockup__main {
  flex: 1;
  background: var(--color-surface);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  overflow: hidden;
}

.mockup__topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mockup__topbar-title {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
}

.mockup__topbar-sub {
  font-size: 0.625rem;
  color: var(--color-muted-fg);
}

.mockup__topbar-date {
  font-size: 0.625rem;
  color: var(--color-muted-fg);
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  padding: 0.25rem 0.5rem;
  background: var(--color-surface);
}

.mockup__metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.mockup__metric {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 0.625rem 0.75rem;
}

.mockup__metric-label {
  font-size: 0.5625rem;
  color: var(--color-muted-fg);
  margin-bottom: 0.25rem;
}

.mockup__metric-value {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

.mockup__metric-delta {
  font-size: 0.5625rem;
  margin-top: 0.125rem;
}

.mockup__metric-delta--up { color: var(--color-chatgpt); }
.mockup__metric-delta--neutral { color: var(--color-muted-fg); }

.mockup__chart-area {
  flex: 1;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 0.75rem;
  min-height: 100px;
  display: flex;
  flex-direction: column;
}

.mockup__chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.mockup__chart-title {
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--color-primary);
}

.mockup__chart-legend {
  display: flex;
  gap: 0.75rem;
}

.mockup__legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.5rem;
  color: var(--color-muted-fg);
}

.mockup__legend-dot {
  width: 0.375rem;
  height: 0.125rem;
  border-radius: 1px;
}

.mockup__chart-svg {
  flex: 1;
  width: 100%;
}

/* ---- Problem / Solution ---- */
.ps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 768px) {
  .ps-grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

.ps-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.ps-card__icon--problem {
  background: color-mix(in srgb, var(--color-destructive) 10%, transparent);
  color: var(--color-destructive);
}

.ps-card__icon--solution {
  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
  color: var(--color-primary);
}

.ps-card h2 {
  margin-bottom: 1rem;
}

.ps-card p {
  color: var(--color-foreground);
  line-height: 1.7;
}

/* ---- How It Works ---- */
.hiw__header {
  text-align: center;
  margin-bottom: 4rem;
}

.hiw__header h2 {
  margin-bottom: 1rem;
}

.hiw__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  position: relative;
}

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

.hiw__card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.hiw__card-top {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.hiw__number {
  font-size: 1.5rem;
  font-weight: 500;
  color: color-mix(in srgb, var(--color-muted-fg) 40%, transparent);
  font-family: var(--font-mono);
  line-height: 1;
}

.hiw__icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--color-primary) 5%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.hiw__card h3 {
  margin-bottom: 0.75rem;
}

.hiw__card p {
  font-size: 1rem;
  color: var(--color-muted-fg);
  line-height: 1.6;
}

/* ---- Features ---- */
.features__header {
  text-align: center;
  margin-bottom: 4rem;
}

.features__header h2 {
  margin-bottom: 1rem;
}

.features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.15s;
}

.feature-card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.feature-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--color-primary) 5%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-muted-fg);
  line-height: 1.6;
}

/* ---- Social Proof ---- */
.proof__header {
  margin-bottom: 3.5rem;
}

.proof__header h2 {
  max-width: 32rem;
  line-height: 1.2;
}

.proof__stats {
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

@media (min-width: 768px) {
  .proof__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.proof__stat-value {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 500;
  color: white;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.proof__stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

.proof__testimonials {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

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

.testimonial {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s;
}

.testimonial:hover {
  border-color: color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.testimonial--featured {
  background: var(--color-surface);
}

@media (min-width: 768px) {
  .testimonial--featured {
    grid-row: span 2;
  }
}

.testimonial__stars {
  display: flex;
  gap: 0.125rem;
  margin-bottom: 1rem;
}

.testimonial__star {
  width: 1rem;
  height: 1rem;
  fill: var(--color-primary);
}

.testimonial__quote {
  font-size: 0.9375rem;
  color: var(--color-primary);
  line-height: 1.6;
}

.testimonial--featured .testimonial__quote {
  font-size: 1.0625rem;
}

.testimonial__footer {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.5rem;
}

.testimonial--featured .testimonial__footer {
  margin-top: 2rem;
}

.testimonial__role {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

.testimonial__industry {
  font-size: 0.75rem;
  color: var(--color-muted-fg);
  margin-top: 0.125rem;
}

.testimonial__outcome {
  text-align: right;
  flex-shrink: 0;
}

.testimonial__outcome-value {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-primary);
  font-family: var(--font-mono);
  line-height: 1;
}

.testimonial--featured .testimonial__outcome-value {
  font-size: 1.375rem;
}

.testimonial__outcome-label {
  font-size: 0.625rem;
  color: var(--color-muted-fg);
  margin-top: 0.125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.testimonial__outcome-badge {
  background: color-mix(in srgb, var(--color-primary) 5%, transparent);
  border-radius: 0.5rem;
  padding: 0.5rem 0.75rem;
}

.proof__disclaimer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-muted-fg);
  margin-top: 2rem;
}

/* ---- FAQ ---- */
.faq__header {
  text-align: center;
  margin-bottom: 4rem;
}

.faq__header h2 {
  margin-bottom: 1rem;
}

.faq__list {
  max-width: 48rem;
  margin: 0 auto;
}

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

.faq__item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  line-height: 1.5;
}

.faq__question:hover {
  color: var(--color-muted-fg);
}

.faq__chevron {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  color: var(--color-muted-fg);
  transition: transform 0.2s;
}

.faq__item.open .faq__chevron {
  transform: rotate(180deg);
}

.faq__answer {
  display: none;
  padding-bottom: 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-muted-fg);
  line-height: 1.7;
}

.faq__item.open .faq__answer {
  display: block;
}

/* ---- Bottom CTA ---- */
.cta-section {
  padding: 6rem 1.5rem;
  background: var(--color-primary);
  text-align: center;
}

.cta-section h2 {
  color: var(--color-primary-fg);
  margin-bottom: 2rem;
}

.cta__form {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  max-width: 28rem;
  margin: 0 auto;
}

.cta__input {
  flex: 1;
  min-width: 12rem;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  border: none;
  border-radius: 0.5rem;
  background: white;
  color: var(--color-primary);
  outline: none;
}

.cta__input::placeholder {
  color: var(--color-muted-fg);
}

/* ---- Footer ---- */
.footer {
  padding: 3rem 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__brand-name {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.footer__brand-desc {
  font-size: 0.875rem;
  color: var(--color-muted-fg);
}

.footer__col-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.footer__col-link {
  display: block;
  font-size: 0.875rem;
  color: var(--color-muted-fg);
  margin-bottom: 0.5rem;
  transition: color 0.15s;
}

.footer__col-link:hover {
  color: var(--color-foreground);
}

.footer__bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-muted-fg);
}

/* ---- Responsive nav ---- */
@media (max-width: 767px) {
  .nav__links {
    display: none;
  }

  .mockup__body {
    flex-direction: column;
    min-height: auto;
  }

  .mockup__sidebar {
    width: 100%;
    padding: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .mockup__sidebar-logo {
    margin-bottom: 0;
  }

  .mockup__sidebar-item {
    margin-bottom: 0;
  }

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

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