/* ============================================================
   Tangrome Marketing Site — styles.css
   Mobile-first. Single breakpoint at 768px for desktop.
   ============================================================ */

/* ------------------------------------------------------------
   Brand tokens
   ------------------------------------------------------------ */
:root {
  --color-primary:      #c479ff;   /* primary brand color */
  --color-secondary:    #6ad51e;   /* secondary brand color */
  --color-accent:       #ff7b39;   /* accent / highlight */
  --color-bg:           #ecebf0;   /* page background */
  --color-surface:      #ffffff;   /* card / section background */
  --color-surface-alt:  #f5f4fa;   /* alternate surface */
  --color-text:         #1c1133;   /* primary text */
  --color-text-muted:   #6e6490;   /* secondary / muted text */
  --color-border:       rgba(28, 17, 51, 0.10);

  /* Typography */
  --font-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-base: 1rem;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 1080px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 220ms ease;
}

/* ------------------------------------------------------------
   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-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

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

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

ul {
  list-style: none;
}

/* ------------------------------------------------------------
   Utility
   ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ------------------------------------------------------------
   Reveal-on-scroll animation
   Elements with .reveal start hidden; JS adds .visible
   ------------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ------------------------------------------------------------
   Buttons
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform var(--transition-base), opacity var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  opacity: 0.92;
}

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

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

.btn-app-store {
  background: var(--color-primary);
  color: #fff;
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
}

.btn-app-store-large {
  background: var(--color-primary);
  color: #fff;
  font-size: 1rem;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-md);
}

/* App Store badge image inside button */
.btn .appstore-icon {
  width: 20px;
  height: 20px;
}

/* ------------------------------------------------------------
   Header / Nav
   ------------------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(236, 235, 240, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
  text-decoration: none;
}

.site-logo img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: contain;
}

.logo-wordmark {
  letter-spacing: -0.02em;
}

/* ------------------------------------------------------------
   Hero
   ------------------------------------------------------------ */
.section-hero {
  padding-block: var(--space-16) var(--space-12);
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero-headline {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.hero-headline .highlight {
  color: var(--color-primary);
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
}

.hero-screenshot {
  margin-inline: auto;
  max-width: 320px;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  background: var(--color-surface);
}

.hero-screenshot img {
  width: 100%;
  border-radius: var(--radius-lg);
}

/* Screenshot placeholder (shown when image missing) */
.screenshot-placeholder {
  aspect-ratio: 9 / 19.5;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border: 1px dashed var(--color-border);
}

@media (min-width: 768px) {
  .section-hero {
    padding-block: var(--space-24) var(--space-16);
  }

  .hero-cta {
    flex-direction: row;
    justify-content: center;
  }

  .hero-screenshot {
    max-width: 380px;
  }
}

/* ------------------------------------------------------------
   Summary
   ------------------------------------------------------------ */
.section-summary {
  padding-block: var(--space-16);
  background: var(--color-surface);
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: var(--space-3);
  display: block;
}

.section-heading {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.section-body {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 620px;
  margin-bottom: var(--space-6);
}

.summary-grid {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.summary-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.summary-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.summary-item h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.summary-item p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

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

/* ------------------------------------------------------------
   Features
   ------------------------------------------------------------ */
.section-features {
  padding-block: var(--space-16);
}

.features-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.features-header .section-body {
  margin-inline: auto;
}

.features-grid {
  display: grid;
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: rgba(196, 121, 255, 0.4);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: var(--space-4);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

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

@media (min-width: 960px) {
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ------------------------------------------------------------
   Download CTA
   ------------------------------------------------------------ */
.section-download {
  padding-block: var(--space-16);
  background: var(--color-surface);
  text-align: center;
}

.download-inner {
  max-width: 560px;
  margin-inline: auto;
}

.download-inner .section-heading {
  margin-bottom: var(--space-4);
}

.download-inner .section-body {
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

/* ------------------------------------------------------------
   Support
   ------------------------------------------------------------ */
.section-support {
  padding-block: var(--space-12);
  text-align: center;
}

.support-inner {
  max-width: 480px;
  margin-inline: auto;
}

.support-inner h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.support-inner p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-4);
}

.support-email {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.support-email:hover {
  opacity: 0.75;
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

.footer-nav {
  display: flex;
  gap: var(--space-6);
}

.footer-nav a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-text);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .site-footer .container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ------------------------------------------------------------
   Legal pages (privacy / terms)
   ------------------------------------------------------------ */
.legal-main {
  padding-block: var(--space-16);
}

.legal-header {
  margin-bottom: var(--space-10);
}

.legal-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-2);
}

.legal-header p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.legal-content {
  max-width: 720px;
}

.legal-content p,
.legal-content li {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

.legal-content h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.legal-placeholder {
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.legal-placeholder strong {
  display: block;
  color: var(--color-secondary);
  margin-bottom: var(--space-2);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}