/* RECORDUM.AI — Marketing Landing Page */

/* === TOKENS === */
:root {
  --color-primary:       #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-accent:        #7C3AED;
  --color-success:       #16A34A;
  --color-danger:        #DC2626;

  --dark-bg:      #0B1020;
  --dark-border:  #263257;
  --dark-text:    #EAF0FF;
  --dark-muted:   #B9C3E3;
  --dark-subtle:  #8792B8;

  --light-bg:     #F0F4FF;
  --light-white:  #FFFFFF;
  --light-text:   #0F1729;
  --light-muted:  #485275;
  --light-subtle: #8A95B8;
  --light-border: #E0E7F5;
  --light-shadow: 0 1px 3px rgba(15,23,41,.07), 0 4px 18px rgba(59,130,246,.07);

  --font-sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-h1:      clamp(3.5rem, 8vw, 6rem);
  --fs-h2:      clamp(2.5rem, 5.5vw, 4.25rem);
  --fs-h3:      clamp(1.375rem, 2.5vw, 2rem);
  --fs-h4:      1.25rem;
  --fs-body:    1rem;
  --fs-small:   0.875rem;
  --fs-caption: 0.75rem;

  --lh-tight: 1.15;
  --lh-body:  1.6;

  --sp-1:4px;  --sp-2:8px;  --sp-3:12px; --sp-4:16px;
  --sp-5:24px; --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px;

  --radius-sm: 10px;
  --radius-md: 16px;

  --focus-ring: 0 0 0 3px rgba(37,99,235,.4);
  --max-w:  1200px;
  --text-w: 680px;
  --gutter: clamp(16px, 4vw, 32px);
  --dur:    160ms;
  --ease:   ease-out;
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
img, svg { display: block; max-width: 100%; }
input, button, textarea { font: inherit; }

/* === BASE === */
body {
  background: var(--light-white);
  color: var(--light-text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  overflow-x: hidden;
}

/* === LAYOUT === */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* === SECTIONS === */
.section     { padding-block: var(--sp-8); background: var(--light-white); color: var(--light-text); }
.section--alt { background: var(--light-bg); }
.section--cta {
  background: linear-gradient(135deg, #1E3A8A 0%, #2563EB 52%, #6D28D9 100%);
  color: #FFFFFF;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 1.9375rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--sp-3);
}
.section--cta .section-label { color: rgba(255,255,255,.65); }

.section-head           { margin-bottom: var(--sp-7); }
.section-head--center   { text-align: center; }
.section-head--center .section-label,
.section-head--center h2,
.section-head--center .section-sub { margin-inline: auto; }

.section-sub {
  font-size: 1.0625rem;
  color: var(--light-muted);
  max-width: 60ch;
  margin-top: var(--sp-4);
  line-height: var(--lh-body);
}
.section--cta .section-sub { color: rgba(255,255,255,.8); }

h2, h3, h4 { line-height: var(--lh-tight); font-weight: 700; color: var(--light-text); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); font-weight: 650; }

/* === BADGES === */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: var(--fs-caption);
  font-weight: 500;
  line-height: 1.5;
  white-space: nowrap;
  border: 1px solid;
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }
.badge--active    { color: #60A5FA; border-color: #60A5FA; }
.badge--verified  { color: #4ADE80; border-color: #4ADE80; }
.badge--immutable { color: #94A3B8; border-color: #3D4E7A; }
.badge--interpret { color: #A78BFA; border-color: #A78BFA; }
.badge--lgt-immutable { color: var(--light-muted);  border-color: var(--light-border); }
.badge--lgt-verified  { color: var(--color-success); border-color: var(--color-success); }
.badge--lgt-interpret { color: var(--color-accent);  border-color: var(--color-accent); }

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  height: 44px;
  padding-inline: var(--sp-5);
  border-radius: var(--radius-sm);
  border: none;
  font-size: var(--fs-body);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn:disabled      { opacity: .6; cursor: not-allowed; }

.btn--primary { background: var(--color-primary); color: #FFFFFF; }
.btn--primary:not(:disabled):hover {
  background: var(--color-primary-hover, #1D4ED8);
  color: #FFFFFF;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(37,99,235,.35);
}

/* White inverted button — for use inside gradient CTA section */
.btn--inv { background: #FFFFFF; color: #1E3A8A; }
.btn--inv:not(:disabled):hover {
  background: rgba(255,255,255,.9);
  color: #1E3A8A;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0,0,0,.2);
}

/* Ghost for nav */
.btn--ghost { background: transparent; color: var(--dark-muted); border: 1px solid var(--dark-border); }
.btn--ghost:hover { background: rgba(255,255,255,.06); color: var(--dark-text); text-decoration: none; }

/* === FORMS === */
.email-form { display: flex; gap: var(--sp-2); flex-wrap: wrap; }

.email-input {
  flex: 1 1 260px;
  height: 44px;
  padding-inline: var(--sp-4);
  background: var(--light-white);
  border: 1.5px solid var(--light-border);
  border-radius: var(--radius-sm);
  color: var(--light-text);
  font-size: var(--fs-body);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.email-input::placeholder { color: var(--light-subtle); }
.email-input:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--focus-ring); }

/* Transparent variant for dark backgrounds */
.input--dark {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.25);
  color: #FFFFFF;
}
.input--dark::placeholder { color: rgba(255,255,255,.5); }
.input--dark:focus { border-color: rgba(255,255,255,.55); box-shadow: 0 0 0 3px rgba(255,255,255,.12); }

.form-note    { font-size: var(--fs-caption); color: var(--light-subtle); margin-top: var(--sp-2); }
.form-status  { font-size: var(--fs-small); color: var(--color-danger); margin-top: var(--sp-2); min-height: 1.4em; }
.form-status--success { color: var(--color-success); }
.hp-field { display: none !important; visibility: hidden !important; }

/* === NAV === */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,16,32,.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(38,50,87,.55);
}
.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.site-nav__logo img { height: 28px; width: auto; }

/* === HERO === */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(80px, 13vw, 130px);
  text-align: center;
  background: var(--dark-bg);
}

/* Parallax image layer — translateY set by JS on scroll.
   Extra vertical bleed (top/bottom: -80%) gives the aggressive
   parallax factor room to move without exposing blank edges. */
.hero-bg {
  position: absolute;
  top: -80%;
  left: 0;
  right: 0;
  bottom: -80%;
  background: radial-gradient(circle at 25% 20%, rgba(96,165,250,.3), rgba(11,16,32,0) 42%),
              radial-gradient(circle at 70% 30%, rgba(124,58,237,.22), rgba(11,16,32,0) 38%);
  will-change: transform;
  z-index: 0;
}

@media (min-width: 769px) {
  .hero-bg {
    background: url('hero-bg.png') center 35% / cover no-repeat;
  }
}

/* Graduated overlay: atmospheric at top, full dark at base to blend into next section */
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to bottom,
    rgba(11,16,32,.2)  0%,
    rgba(11,16,32,.5)  40%,
    rgba(11,16,32,.78) 70%,
    rgba(11,16,32,.96) 88%,
    #0B1020            100%
  );
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* SVG logo rendered in HTML over the bg — stays vector-sharp */
.hero__logo {
  width: clamp(180px, 28vw, 336px);
  height: auto;
  margin-bottom: var(--sp-5);
  filter:
    drop-shadow(0 0 28px rgba(96,165,250,.85))
    drop-shadow(0 0 72px rgba(59,130,246,.5));
}

.hero__h1 {
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--dark-text);
  margin-bottom: var(--sp-4);
  text-shadow: 0 2px 28px rgba(0,0,0,.6);
}

.hero__sub {
  font-size: 1.25rem;
  color: var(--dark-muted);
  max-width: 54ch;
  margin-bottom: var(--sp-5);
  line-height: var(--lh-body);
}

/* "Record → Preserve → Summarize → Defend" */
.hero__flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--sp-4);
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 2.2vw, 1.5rem);
  color: var(--dark-subtle);
  letter-spacing: 0.02em;
  margin-bottom: var(--sp-7);
}
.flow-sep { color: #0fe93e; opacity: .8; }

/* Hero email form */
.hero__form { width: 100%; max-width: 520px; justify-content: center; }
.hero__form .email-input {
  background: rgba(255,255,255,.1);
  border-color: rgba(255,255,255,.2);
  color: var(--dark-text);
}
.hero__form .email-input::placeholder { color: rgba(185,195,227,.55); }
.hero__form .email-input:focus {
  border-color: rgba(255,255,255,.48);
  box-shadow: 0 0 0 3px rgba(255,255,255,.1);
}
.hero__note { font-size: var(--fs-caption); color: var(--dark-subtle); margin-top: var(--sp-3); }
.hero .form-status          { color: #FCA5A5; }
.hero .form-status--success { color: #86EFAC; }
.hero__proof {
  margin-top: var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--sp-2);
}
.proof-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 99px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--dark-muted);
  background: rgba(255,255,255,.08);
}

/* Transition strip from dark hero → light first section */
.hero-fade {
  height: 56px;
  background: linear-gradient(to bottom, #0B1020 0%, var(--light-bg) 100%);
}

/* === PROBLEM === */
.problem-lead {
  font-size: 2.0625rem;
  color: var(--light-muted);
  max-width: 62ch;
  margin-bottom: var(--sp-7);
  line-height: var(--lh-body);
}
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--sp-5);
}
.problem-item {
  display: flex;
  gap: var(--sp-4);
  padding: var(--sp-5);
  background: var(--light-white);
  border: 1px solid var(--light-border);
  border-radius: var(--radius-md);
  box-shadow: var(--light-shadow);
}
.problem-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(220,38,38,.08);
  color: var(--color-danger);
  flex-shrink: 0;
}
.problem-item h4 { margin-bottom: var(--sp-1); }
.problem-item p  { font-size: var(--fs-small); color: var(--light-muted); }

/* === HOW IT WORKS === */
.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-5);
}
.how-card {
  background: var(--light-white);
  border: 1px solid var(--light-border);
  border-radius: var(--radius-md);
  padding: var(--sp-6);
  box-shadow: var(--light-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.how-card:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(59,130,246,.12); }
.how-card--interpret { border-color: rgba(124,58,237,.2); background: #FDFAFF; }
.how-card--interpret:hover { box-shadow: 0 8px 32px rgba(124,58,237,.12); }
.how-card__num { font-family: var(--font-mono); font-size: var(--fs-caption); color: var(--light-subtle); margin-bottom: var(--sp-4); }
.how-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--sp-4);
}
.how-card--source   .how-card__icon,
.how-card--system   .how-card__icon  { background: rgba(37,99,235,.1);  color: var(--color-primary); }
.how-card--interpret .how-card__icon { background: rgba(124,58,237,.12); color: var(--color-accent); }
.how-card h3 { margin-bottom: var(--sp-3); }
.how-card p  { font-size: var(--fs-small); color: var(--light-muted); line-height: var(--lh-body); }
.how-card__badge { margin-top: var(--sp-5); }

/* === DIFFERENTIATORS === */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: var(--sp-5);
}
.diff-card {
  background: var(--light-white);
  border: 1px solid var(--light-border);
  border-radius: var(--radius-md);
  padding: var(--sp-6);
  box-shadow: var(--light-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.diff-card:hover { transform: translateY(-3px); border-color: rgba(37,99,235,.25); box-shadow: 0 8px 32px rgba(37,99,235,.1); }
.diff-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(37,99,235,.09);
  color: var(--color-primary);
  margin-bottom: var(--sp-4);
}
.diff-card h3 { font-size: var(--fs-h4); margin-bottom: var(--sp-3); }
.diff-card p  { font-size: var(--fs-small); color: var(--light-muted); line-height: var(--lh-body); }

/* === AUDIENCES === */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-5);
}
.audience-card {
  background: var(--light-white);
  border: 1px solid var(--light-border);
  border-radius: var(--radius-md);
  padding: var(--sp-6);
  box-shadow: var(--light-shadow);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.audience-card:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(59,130,246,.1); }
.audience-card__label {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--color-primary);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: var(--sp-3);
}
.audience-card h3 { font-size: var(--fs-h4); margin-bottom: var(--sp-3); }
.audience-card p  { font-size: var(--fs-small); color: var(--light-muted); line-height: var(--lh-body); }

/* === CTA SECTION === */
.cta-inner { max-width: var(--text-w); margin-inline: auto; text-align: center; }
.cta-inner h2 { color: #FFFFFF; margin-bottom: var(--sp-4); }
.cta-form { display: flex; gap: var(--sp-2); flex-wrap: wrap; justify-content: center; }
.cta-form .email-input { flex: 1 1 280px; max-width: 360px; }
.section--cta .form-note { color: rgba(255,255,255,.8); }
.section--cta .form-status { color: #FECACA; }
.section--cta .form-status--success { color: #BBF7D0; }

/* === FAQ === */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
  max-width: 860px;
  margin-inline: auto;
}
.faq-item {
  background: var(--light-white);
  border: 1px solid var(--light-border);
  border-radius: var(--radius-md);
  padding: var(--sp-4) var(--sp-5);
  box-shadow: var(--light-shadow);
}
.faq-item summary {
  font-size: var(--fs-body);
  font-weight: 600;
  line-height: 1.4;
  color: var(--light-text);
  cursor: pointer;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  float: right;
  color: var(--light-subtle);
  font-weight: 500;
}
.faq-item[open] summary::after { content: '\2212'; }
.faq-item p {
  margin-top: var(--sp-3);
  color: var(--light-muted);
  font-size: var(--fs-small);
  line-height: var(--lh-body);
}

/* === FOOTER === */
.site-footer { background: var(--dark-bg); border-top: 1px solid var(--dark-border); padding-block: var(--sp-6); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: var(--sp-4); }
.footer-logo img { height: 22px; width: auto; opacity: .6; }
.footer-copy { font-size: var(--fs-caption); color: var(--dark-subtle); }
.footer-links { display: flex; gap: var(--sp-5); }
.footer-links a { font-size: var(--fs-caption); color: var(--dark-subtle); text-decoration: none; transition: color var(--dur) var(--ease); }
.footer-links a:hover { color: var(--dark-muted); }

/* === CONTACT MODAL === */
.contact-modal {
  position: fixed;
  inset: 0;
  margin: auto;
  width: min(580px, calc(100vw - 32px));
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
  border: 1px solid var(--light-border);
  border-radius: var(--radius-md);
  padding: 0;
  box-shadow: 0 24px 80px rgba(0,0,0,.35);
  background: var(--light-white);
}
.contact-modal::backdrop {
  background: rgba(11,16,32,.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.contact-modal__inner {
  padding: var(--sp-7) var(--sp-6);
  position: relative;
}
.contact-modal__close {
  position: absolute;
  top: var(--sp-4);
  right: var(--sp-4);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--light-muted);
  padding: 6px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.contact-modal__close:hover { color: var(--light-text); background: var(--light-bg); }
.contact-modal__close:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.contact-modal h2 { color: var(--light-text); margin-bottom: var(--sp-3); }
.contact-modal__sub {
  font-size: var(--fs-small);
  color: var(--light-muted);
  line-height: var(--lh-body);
  margin-bottom: 0;
}

/* Stacked contact form fields */
.contact-form { display: flex; flex-direction: column; gap: var(--sp-4); margin-top: var(--sp-5); }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field label { font-size: var(--fs-small); font-weight: 600; color: var(--light-text); }
.form-field input,
.form-field textarea {
  padding: var(--sp-3) var(--sp-4);
  background: var(--light-white);
  border: 1.5px solid var(--light-border);
  border-radius: var(--radius-sm);
  color: var(--light-text);
  font-size: var(--fs-body);
  width: 100%;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--light-subtle); }
.form-field input:focus,
.form-field textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--focus-ring); }
.form-field textarea { resize: vertical; min-height: 128px; line-height: var(--lh-body); }
.contact-form__submit { width: 100%; }

/* Footer contact button styled to match footer links */
.footer-contact-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: var(--fs-caption);
  color: var(--dark-subtle);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.footer-contact-btn:hover { color: var(--dark-muted); }
.footer-contact-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: 3px; }

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .section         { padding-block: 48px; }
  .hero            { padding-block: 72px; }
  .section-label   { font-size: 1.5rem; }
  .email-form,
  .cta-form        { flex-direction: column; }
  .email-input {
    flex: 0 0 auto;
    height: 36px;
    min-height: 36px;
    padding-block: 0;
    padding-inline: 12px;
    font-size: 0.95rem;
    line-height: 1.2;
    border-radius: 8px;
  }
  .form-field input {
    height: 36px;
    min-height: 36px;
    padding-block: 0;
    padding-inline: 12px;
    font-size: 0.95rem;
    line-height: 1.2;
  }
  .email-form .btn,
  .cta-form .btn   {
    width: 100%;
    height: 40px;
    font-size: 0.95rem;
    border-radius: 8px;
  }
  .cta-form .email-input {
    flex: 0 0 auto;
    max-width: none;
  }
  .footer-inner    { flex-direction: column; text-align: center; }
  .footer-links    { justify-content: center; }
  .faq-item        { padding: var(--sp-4); }
}