/* ============================================
   CARD TRADER LLC — Design Tokens & Styles
   Art direction: Clean fintech / SaaS
   Palette: Cool slate + navy primary + teal accent
   ============================================ */

/* --- Type Scale (Fluid) --- */
:root {
  --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,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* --- 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;

  /* --- 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: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  /* --- Fonts --- */
  --font-display: 'General Sans', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
}

/* ============================================
   COLOR — Navy/Slate Fintech Palette
   ============================================ */

:root, [data-theme="light"] {
  /* Surfaces */
  --color-bg:             #F8F9FB;
  --color-surface:        #FFFFFF;
  --color-surface-2:      #F1F3F7;
  --color-surface-offset: #E8EBF0;
  --color-divider:        #D5D9E0;
  --color-border:         #C5CAD4;

  /* Text */
  --color-text:           #1A1D26;
  --color-text-muted:     #5C6170;
  --color-text-faint:     #9BA1B0;
  --color-text-inverse:   #F8F9FB;

  /* Primary (Navy) */
  --color-primary:        #1B3A5C;
  --color-primary-hover:  #142C47;
  --color-primary-active: #0F2135;

  /* Accent (Teal-green for data/CTA) */
  --color-accent:         #0E8A6D;
  --color-accent-hover:   #0A6E57;

  /* Semantic */
  --color-error:          #C03744;
  --color-warning:        #B46A1D;
  --color-success:        #2E7D4F;

  /* Shadows (cool-tinted) */
  --shadow-sm: 0 1px 2px oklch(0.25 0.01 250 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.25 0.01 250 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.25 0.01 250 / 0.12);
}

[data-theme="dark"] {
  --color-bg:             #0F1117;
  --color-surface:        #161921;
  --color-surface-2:      #1C1F2A;
  --color-surface-offset: #22263A;
  --color-divider:        #2A2E3F;
  --color-border:         #363B4E;

  --color-text:           #D4D7E0;
  --color-text-muted:     #8B90A0;
  --color-text-faint:     #5A5F70;
  --color-text-inverse:   #0F1117;

  --color-primary:        #6B9DD6;
  --color-primary-hover:  #5288C4;
  --color-primary-active: #3D74B0;

  --color-accent:         #3DC9A0;
  --color-accent-hover:   #2DB88F;

  --color-error:          #E86B74;
  --color-warning:        #D89B4A;
  --color-success:        #5CB87A;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0F1117;
    --color-surface:        #161921;
    --color-surface-2:      #1C1F2A;
    --color-surface-offset: #22263A;
    --color-divider:        #2A2E3F;
    --color-border:         #363B4E;
    --color-text:           #D4D7E0;
    --color-text-muted:     #8B90A0;
    --color-text-faint:     #5A5F70;
    --color-text-inverse:   #0F1117;
    --color-primary:        #6B9DD6;
    --color-primary-hover:  #5288C4;
    --color-primary-active: #3D74B0;
    --color-accent:         #3DC9A0;
    --color-accent-hover:   #2DB88F;
    --color-error:          #E86B74;
    --color-warning:        #D89B4A;
    --color-success:        #5CB87A;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
  }
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow {
  max-width: var(--content-default);
}

/* ============================================
   HEADER / NAV
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
  transition: box-shadow 0.3s ease;
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.header__logo-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.header__logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
}

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

.header__theme-toggle {
  color: var(--color-text-muted);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.header__theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* Mobile nav */
.header__mobile-toggle {
  display: none;
  color: var(--color-text);
  padding: var(--space-2);
}

@media (max-width: 768px) {
  .header__nav {
    display: none;
  }
  .header__nav--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-6);
    gap: var(--space-4);
  }
  .header__mobile-toggle {
    display: block;
  }
}

/* ============================================
   HERO
   ============================================ */

.hero {
  padding-block: clamp(var(--space-10), 6vw, var(--space-20));
  text-align: left;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  margin-bottom: var(--space-6);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 50ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Hero visual — data visualization card */
.hero__visual {
  display: flex;
  justify-content: center;
}

.hero__card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-md);
}

.hero__card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-4);
}

.hero__card-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.hero__card-delta {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 600;
}

.hero__card-value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.hero__card-chart {
  width: 100%;
  height: 120px;
}

.hero__card-chart svg {
  width: 100%;
  height: 100%;
}

.hero__card-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-2);
}

.hero__card-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-body);
  font-weight: 500;
}

.hero__card-items {
  margin-top: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.hero__card-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.hero__card-item-name {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
}

.hero__card-item-detail {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-body);
}

.hero__card-item-price {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.hero__card-item-change {
  font-size: var(--text-xs);
  font-family: var(--font-body);
  font-weight: 600;
}

.hero__card-item-change--up { color: var(--color-accent); }
.hero__card-item-change--down { color: var(--color-error); }

@media (max-width: 768px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .hero__visual {
    order: -1;
  }
  .hero__card {
    max-width: 100%;
  }
}

/* ============================================
   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: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

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

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

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

.btn--secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-text-muted);
}

/* ============================================
   SECTION — MISSION
   ============================================ */

.section {
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
}

.section--alt {
  background: var(--color-surface);
}

.section__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.7;
}

/* ============================================
   EXPLORING GRID
   ============================================ */

.explore-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}

.explore-card {
  background: var(--color-bg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

[data-theme="dark"] .explore-card,
:root:not([data-theme]) .explore-card {
  background: var(--color-surface-2);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .explore-card {
    background: var(--color-bg);
  }
}

.explore-card:hover {
  border-color: oklch(from var(--color-text) l c h / 0.16);
  box-shadow: var(--shadow-sm);
}

.explore-card__icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
}

.explore-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.explore-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

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

/* ============================================
   ABOUT / FOUNDER
   ============================================ */

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.about__content {
  max-width: 55ch;
}

.about__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.about__stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.about__stat {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.about__stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.about__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

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

/* ============================================
   CONTACT FORM
   ============================================ */

.contact__inner {
  max-width: var(--content-narrow);
  margin-inline: auto;
  text-align: center;
}

.contact__form {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-align: left;
}

.contact__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 480px) {
  .contact__row {
    grid-template-columns: 1fr;
  }
}

.contact__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.contact__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact__input,
.contact__textarea {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.12);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  width: 100%;
}

.contact__input::placeholder,
.contact__textarea::placeholder {
  color: var(--color-text-faint);
}

.contact__input:focus,
.contact__textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}

.contact__textarea {
  resize: vertical;
  min-height: 120px;
}

.contact__submit {
  align-self: flex-start;
  margin-top: var(--space-2);
}

.contact__email-cta {
  margin-top: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.contact__note {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.08);
  padding-block: var(--space-8);
}

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

.footer__left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer__logo-mark {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

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

.footer__right {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.footer__link {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

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

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Staggered children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 240ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}