/* style.css — FearlessAI Design Tokens + Components */

/* ================================================
   DESIGN TOKENS
   ================================================ */
:root {
  /* Type Scale */
  --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,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing (4px grid) */
  --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;

  /* Fonts */
  --font-display: 'DM Serif Display', 'Georgia', serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  /* 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%;
}

/* ================================================
   LIGHT MODE
   ================================================ */
[data-theme="light"] {
  --color-bg:             #f5f2ed;
  --color-surface:        #faf8f5;
  --color-surface-2:      #ffffff;
  --color-surface-offset: #ede9e3;
  --color-divider:        #dcd8d1;
  --color-border:         #d0cbc3;
  --color-navy:           #0a1628;

  --color-text:           #1a1a2e;
  --color-text-muted:     #6b6b7b;
  --color-text-faint:     #a0a0ab;
  --color-text-inverse:   #f5f2ed;

  --color-primary:        #3eb8c8;
  --color-primary-hover:  #2f9aa8;
  --color-primary-active: #257f8b;
  --color-primary-highlight: oklch(from #3eb8c8 l c h / 0.12);

  --color-secondary:      #e8923e;
  --color-secondary-hover: #d07e2e;
  --color-secondary-active: #b56a1f;

  --color-error:          #c0392b;
  --color-success:        #27ae60;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);
}

/* ================================================
   DARK MODE (default for FearlessAI)
   ================================================ */
[data-theme="dark"] {
  --color-bg:             #0a1628;
  --color-surface:        #0f1d33;
  --color-surface-2:      #152640;
  --color-surface-offset: #0d1a2e;
  --color-divider:        #1a2d4a;
  --color-border:         #243a5a;
  --color-navy:           #0a1628;

  --color-text:           #e8e6e1;
  --color-text-muted:     #8a8a96;
  --color-text-faint:     #555566;
  --color-text-inverse:   #0a1628;

  --color-primary:        #4ecbd8;
  --color-primary-hover:  #3bb5c2;
  --color-primary-active: #2d9eaa;
  --color-primary-highlight: oklch(from #4ecbd8 l c h / 0.12);

  --color-secondary:      #f0a050;
  --color-secondary-hover: #e08d3a;
  --color-secondary-active: #cc7a28;

  --color-error:          #e74c3c;
  --color-success:        #2ecc71;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

/* ================================================
   TYPOGRAPHY
   ================================================ */
.font-display {
  font-family: var(--font-display);
}

.overline {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
}

/* ================================================
   LAYOUT
   ================================================ */
.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

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

/* ================================================
   NAVIGATION
   ================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-4);
  transition: background 300ms cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.nav.scrolled {
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo svg {
  flex-shrink: 0;
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

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

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

.nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.nav__toggle:hover {
  color: var(--color-text);
  background: oklch(from var(--color-text) l c h / 0.06);
}

/* Mobile menu button */
.nav__mobile-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive);
}

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

@media (min-width: 768px) {
  .nav__mobile-btn {
    display: none;
  }
}

/* Mobile menu overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: oklch(from var(--color-bg) l c h / 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu.active {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.mobile-menu a:hover {
  color: var(--color-primary);
}

.mobile-menu__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
}

/* ================================================
   BUTTONS
   ================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.2;
  min-height: 44px;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

.btn:hover {
  transform: translateY(-1px);
}

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

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

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

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

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

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

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  padding: var(--space-2) var(--space-4);
}

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

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  min-height: 36px;
}

.btn--nav {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  min-height: 40px;
  border-radius: var(--radius-md);
}

/* ================================================
   SECTIONS
   ================================================ */
.section {
  padding: clamp(var(--space-12), 8vw, var(--space-32)) 0;
}

.section--dark {
  background: var(--color-navy);
  color: #e8e6e1;
}

/* Override colors for dark sections in light mode */
[data-theme="light"] .section--dark {
  --color-text: #e8e6e1;
  --color-text-muted: #8a8a96;
  --color-text-faint: #555566;
  --color-text-inverse: #0a1628;
  --color-primary: #4ecbd8;
  --color-primary-hover: #3bb5c2;
  --color-primary-active: #2d9eaa;
  --color-primary-highlight: oklch(from #4ecbd8 l c h / 0.12);
  --color-surface: #0f1d33;
  --color-surface-2: #152640;
  --color-surface-offset: #0d1a2e;
  --color-border: #243a5a;
  --color-divider: #1a2d4a;
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

/* Override colors for warm sections in light mode */
[data-theme="light"] .section--warm {
  --color-surface-offset: #ede9e3;
  --color-surface: #faf8f5;
  --color-surface-2: #ffffff;
  --color-border: #d0cbc3;
  --color-text: #1a1a2e;
  --color-text-muted: #6b6b7b;
  --color-text-faint: #a0a0ab;
  --color-primary: #3eb8c8;
  --color-primary-highlight: oklch(from #3eb8c8 l c h / 0.12);
}

.section--warm {
  background: var(--color-bg);
}

[data-theme="dark"] .section--warm {
  background: #0e1f36;
}

[data-theme="light"] .section--warm {
  background: #f5f2ed;
}

.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 5vw, var(--space-16));
}

.section__header .overline {
  margin-bottom: var(--space-4);
}

.section__header h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.section__header p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-inline: auto;
  max-width: 60ch;
}

/* ================================================
   HERO
   ================================================ */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0a1628;
  overflow: hidden;
  padding: clamp(var(--space-20), 12vw, var(--space-32)) var(--space-4);
  padding-top: calc(clamp(var(--space-20), 12vw, var(--space-32)) + var(--space-16));
  color: #e8e6e1;
}

/* Gradient mesh background glow */
.hero__glow {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero__glow::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  width: 80vw;
  height: 80vw;
  max-width: 800px;
  max-height: 800px;
  transform: translate(-50%, -30%);
  background: radial-gradient(ellipse at center,
    oklch(from #4ecbd8 l c h / 0.08) 0%,
    oklch(from #f0a050 l c h / 0.04) 40%,
    transparent 70%
  );
  animation: breathe 8s ease-in-out infinite;
}

.hero__glow::after {
  content: '';
  position: absolute;
  bottom: 10%;
  right: 20%;
  width: 50vw;
  height: 50vw;
  max-width: 500px;
  max-height: 500px;
  background: radial-gradient(ellipse at center,
    oklch(from #4ecbd8 l c h / 0.05) 0%,
    transparent 60%
  );
  animation: breathe 10s ease-in-out infinite;
  animation-delay: -3s;
}

@keyframes breathe {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -30%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -30%) scale(1.05); }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin-inline: auto;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 1.1;
  margin-bottom: var(--space-6);
  color: #e8e6e1;
}

.hero__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  color: #8a8a96;
  line-height: 1.6;
  margin-bottom: var(--space-8);
  margin-inline: auto;
  max-width: 60ch;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.hero__actions .btn--primary {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-8);
}

.hero__video-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: #8a8a96;
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.hero__video-link:hover {
  color: #4ecbd8;
}

/* ================================================
   PROBLEM SECTION
   ================================================ */
.problem-grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .problem-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }
}

.problem-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.problem-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-lg);
  color: var(--color-primary);
  flex-shrink: 0;
}

.problem-card p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.problem-card strong {
  color: var(--color-text);
  font-weight: 500;
}

/* ================================================
   VIDEO SECTION
   ================================================ */
.video-wrapper {
  max-width: 800px;
  margin-inline: auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 8px 40px oklch(0 0 0 / 0.4);
  background: #000;
}

.video-wrapper video {
  width: 100%;
  display: block;
}

.video-caption {
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ================================================
   FEATURES
   ================================================ */
.features-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

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

.feature-card {
  background: var(--color-surface-offset);
  border: 1px solid oklch(from var(--color-text) l c h / 0.06);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-lg);
  color: var(--color-primary);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
}

.feature-card p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.features-footer {
  text-align: center;
  margin-top: var(--space-8);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* ================================================
   EMAIL SIGNUP
   ================================================ */
.signup {
  text-align: center;
}

.signup-form {
  max-width: 480px;
  margin-inline: auto;
  margin-top: var(--space-8);
}

.signup-form__row {
  display: flex;
  gap: var(--space-3);
  flex-direction: column;
}

@media (min-width: 480px) {
  .signup-form__row {
    flex-direction: row;
  }
}

.signup-form__input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
  min-height: 48px;
}

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

.signup-form__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.2);
}

.signup-form__privacy {
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.signup-form__privacy a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-interactive);
}

.signup-form__privacy a:hover {
  color: var(--color-primary);
}

/* Success state */
.signup-success {
  display: none;
  padding: var(--space-8);
  text-align: center;
}

.signup-success.active {
  display: block;
}

.signup-success__icon {
  width: 56px;
  height: 56px;
  margin-inline: auto;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  background: oklch(from var(--color-success) l c h / 0.15);
  border-radius: var(--radius-full);
  color: var(--color-success);
}

.signup-success h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.signup-success p {
  color: var(--color-text-muted);
  margin-inline: auto;
}

/* ================================================
   FOOTER
   ================================================ */
.footer {
  background: var(--color-navy);
  color: #8a8a96;
  padding: var(--space-12) var(--space-4);
  border-top: 1px solid oklch(from #e8e6e1 l c h / 0.06);
}

.footer__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: #e8e6e1;
}

.footer__tagline {
  font-size: var(--text-sm);
  color: #555566;
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  list-style: none;
}

.footer__links a {
  font-size: var(--text-sm);
  color: #8a8a96;
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer__links a:hover {
  color: #e8e6e1;
}

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

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: #8a8a96;
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}

.footer__social a:hover {
  color: #e8e6e1;
  background: oklch(from #e8e6e1 l c h / 0.06);
}

.footer__copyright {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid oklch(from #e8e6e1 l c h / 0.06);
  font-size: var(--text-xs);
  color: #555566;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__copyright {
    text-align: left;
  }
}

/* ================================================
   SCROLL REVEAL ANIMATION
   ================================================ */
.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; }
}

/* Stagger children */
.stagger > * {
  opacity: 1;
}

@supports (animation-timeline: scroll()) {
  .stagger > *:nth-child(1) { animation-delay: 0ms; }
  .stagger > *:nth-child(2) { animation-delay: 60ms; }
  .stagger > *:nth-child(3) { animation-delay: 120ms; }
}