/* ============================================================
   page.css — Spitze.AI Stealth Landing Page
   ============================================================ */

/* ---- Theme Toggle ---- */
.theme-toggle {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  z-index: 100;
  padding: var(--space-2);
  background: transparent;
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-md);
  color: var(--color-text-faint);
  cursor: pointer;
  transition: color var(--transition-interactive),
              border-color var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text-muted);
  border-color: oklch(from var(--color-text) l c h / 0.15);
}

/* ---- Background Canvas ---- */
#neural-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.2;
}

[data-theme="dark"] #neural-canvas {
  opacity: 0.35;
}

/* ---- HERO SECTION ---- */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-10);
  max-width: var(--content-narrow);
}

.hero__logo {
  width: clamp(80px, 15vw, 120px);
  opacity: 0;
  animation: hero-fade-in 1200ms cubic-bezier(0.16, 1, 0.3, 1) 200ms forwards;
}

.logo-img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

[data-theme="dark"] .logo-img {
  filter: brightness(1.15);
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  line-height: 1.2;
  color: var(--color-text);
  letter-spacing: -0.01em;
  opacity: 0;
  animation: hero-fade-in 1200ms cubic-bezier(0.16, 1, 0.3, 1) 600ms forwards;
}

.hero__scroll-hint {
  opacity: 0;
  animation: hero-fade-in 1200ms cubic-bezier(0.16, 1, 0.3, 1) 1200ms forwards,
             float-gentle 3s ease-in-out 2400ms infinite;
  color: var(--color-text-faint);
}

@keyframes hero-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float-gentle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ---- TEASE SECTION ---- */
.tease {
  position: relative;
  z-index: 1;
  padding: clamp(var(--space-16), 12vw, var(--space-32)) var(--space-4);
}

.tease__inner {
  max-width: var(--content-narrow);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: clamp(var(--space-10), 6vw, var(--space-16));
}

.tease__line {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  line-height: 1.3;
  color: var(--color-text-muted);
  text-align: center;
}

/* ---- SIGNAL / CTA SECTION ---- */
.signal {
  position: relative;
  z-index: 1;
  padding: clamp(var(--space-16), 12vw, var(--space-32)) var(--space-4);
  padding-bottom: clamp(var(--space-20), 14vw, var(--space-32));
}

.signal__inner {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.signal__headline {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.3;
}

.signal__sub {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.signal__form {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.signal__input-wrap {
  display: flex;
  width: 100%;
  gap: var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-1);
  background: var(--color-surface);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.signal__input-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.1);
}

.signal__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background: transparent;
  border: none;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  outline: none;
  min-width: 0;
}

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

.signal__btn {
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  border: none;
  border-radius: calc(var(--radius-lg) - var(--space-1));
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-interactive),
              transform var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.signal__btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.signal__btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.signal__note {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.02em;
}

/* ---- FOOTER ---- */
.site-footer {
  position: relative;
  z-index: 1;
  padding: var(--space-8) var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.site-footer__inner {
  max-width: var(--content-default);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.site-footer__copy {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.site-footer__attr {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

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

/* ---- SCROLL FADE-IN ---- */
.fade-in {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .fade-in {
    opacity: 0;
    animation: reveal-fade linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 80%;
  }
}

@keyframes reveal-fade {
  to { opacity: 1; }
}

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
  .signal__input-wrap {
    flex-direction: column;
    gap: 0;
    padding: var(--space-2);
  }

  .signal__input {
    padding: var(--space-3);
    text-align: center;
  }

  .signal__btn {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border-radius: calc(var(--radius-lg) - var(--space-2));
  }

  .site-footer__inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2);
  }
}

/* ---- LIGHT/DARK MODE CANVAS ADJUSTMENT ---- */
[data-theme="light"] #neural-canvas {
  opacity: 0.15;
}