/* ============================================
   AppYourWorld — Design System
   Clean. Precise. Premium.
   ============================================ */

/* Typeface: Inter Variable */
@import url('https://rsms.me/inter/inter.css');

:root {
  /* Palette — monochromatic luxury (dark default) */
  --color-bg: #09090b;
  --color-surface: #18181b;
  --color-surface-raised: #27272a;
  --color-border: #3f3f46;
  --color-text: #ededed;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-accent: #e4e4e7;
  --color-accent-hover: #fafafa;
  --color-accent-subtle: rgba(228, 228, 231, 0.06);
  --color-success: #4ade80;
  --color-error: #f87171;

  /* Typography */
  --font-body: 'Inter', 'InterVariable', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', 'InterVariable', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Consolas, monospace;

  /* Spacing */
  --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;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 640px;
}

/* Light mode */
[data-theme="light"] {
  --color-bg: #fafafa;
  --color-surface: #f4f4f5;
  --color-surface-raised: #e4e4e7;
  --color-border: #d4d4d8;
  --color-text: #18181b;
  --color-text-secondary: #52525b;
  --color-text-muted: #71717a;
  --color-accent: #27272a;
  --color-accent-hover: #09090b;
  --color-accent-subtle: rgba(39, 39, 42, 0.06);
}

/* ---- Reset ---- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  font-feature-settings: 'liga' 1, 'calt' 1;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  letter-spacing: -0.011em;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  position: relative;
}


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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-hover);
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* ---- Layout ---- */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

/* ---- Typography ---- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

h1 { font-size: clamp(2.75rem, 6vw, 4rem); letter-spacing: -0.04em; }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); letter-spacing: -0.03em; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }

.lead {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---- Navigation ---- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav__brand {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

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

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

.nav__link {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: 6px;
  padding: 6px 12px;
}

.nav__link:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.06);
}

.nav__link--active {
  color: var(--color-text);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-2);
}

.nav__toggle svg {
  width: 22px;
  height: 22px;
}

@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(9, 9, 11, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: var(--space-6);
    gap: var(--space-4);
  }

  .nav__links--open {
    display: flex;
  }
}

/* ---- Hero ---- */

.hero {
  padding: calc(56px + 8rem) 0 6rem;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 680px;
}

.hero__title {
  margin-bottom: var(--space-6);
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: var(--space-10);
}

.hero__cta {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

.hero__cta:hover {
  color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

@media (max-width: 640px) {
  .hero {
    padding: calc(56px + 5rem) 0 var(--space-12);
  }
}

/* ---- Divider ---- */

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  line-height: 1.4;
}

.btn--primary {
  background: #ededed;
  color: #09090b;
  border-color: #ededed;
}

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

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

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

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: 0.9rem;
}

.btn:disabled,
.btn--loading {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---- App Grid ---- */

.section-apps {
  padding: var(--space-20) 0;
}

.section-apps__header {
  margin-bottom: var(--space-10);
}

.section-apps__label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

@media (max-width: 640px) {
  .app-grid {
    grid-template-columns: 1fr;
  }
}

.app-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  transition: border-color 150ms ease;
}

.app-card:hover {
  border-color: var(--color-text-muted);
}

.app-card__header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.app-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-subtle);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  color: var(--color-accent);
}

.app-card__name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: var(--space-1);
}

.app-card__tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.app-card__body {
  flex: 1;
  margin-bottom: var(--space-4);
}

.app-card__platforms {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-surface-raised);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.app-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.app-card__price {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 700;
}

.app-card__price span {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ---- Card (generic, used for values etc.) ---- */

.card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
  color: var(--color-accent);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 400;
  margin-bottom: var(--space-2);
}

.card__description {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* ---- Manifesto / Values ---- */

.manifesto {
  padding: var(--space-24) 0 var(--space-16);
  border-top: 1px solid var(--color-border);
}

.manifesto__label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.manifesto__list {
  max-width: 600px;
}

.manifesto__item {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
}

.manifesto__item:first-child {
  border-top: 1px solid var(--color-border);
}

.manifesto__item-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: var(--space-1);
}

.manifesto__item-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---- Category Filter ---- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.filter-btn {
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
}

.filter-btn:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.filter-btn--active {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* ---- Forms ---- */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  min-height: 160px;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

/* Honeypot */
.form-hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

.form-message {
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  margin-top: var(--space-4);
  display: none;
}

.form-message--success {
  display: block;
  background: rgba(74, 222, 128, 0.08);
  color: var(--color-success);
  border: 1px solid rgba(74, 222, 128, 0.2);
}

.form-message--error {
  display: block;
  background: rgba(248, 113, 113, 0.08);
  color: var(--color-error);
  border: 1px solid rgba(248, 113, 113, 0.2);
}

/* ---- Empty State ---- */

.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--color-text-muted);
}

.empty-state__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
  opacity: 0.35;
}

.empty-state__title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.empty-state__text {
  font-size: 0.95rem;
}

/* ---- Footer ---- */

.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
}

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

.footer__brand {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

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

.footer__links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

.footer__bottom {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

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

.footer__copy a {
  color: var(--color-text-secondary);
}

.footer__copy a:hover {
  color: var(--color-accent);
}

/* ---- Theme Toggle ---- */

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.theme-toggle:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

/* ---- Prose (long-form pages) ---- */

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

.prose h1 {
  margin-bottom: var(--space-4);
}

.prose h2 {
  font-size: 1.5rem;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

.prose h3 {
  font-size: 1.2rem;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.prose p {
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: var(--space-2);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.prose strong {
  color: var(--color-text);
  font-weight: 600;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

/* ---- Page Header ---- */

.page-header {
  padding: calc(56px + 4rem) 0 var(--space-8);
}

.page-header__title {
  margin-bottom: var(--space-3);
}

.page-header__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 480px;
}

/* ---- About page ---- */

.about-section {
  padding: calc(56px + 5rem) 0 var(--space-12);
}

.about-lead {
  font-family: var(--font-body);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.45;
  color: var(--color-text);
  margin-bottom: var(--space-8);
  max-width: 560px;
}

/* ---- Contact page ---- */

.contact-section {
  padding: calc(56px + 4rem) 0 var(--space-20);
}

.contact-intro {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  max-width: 400px;
  line-height: 1.7;
}

/* ---- Utilities ---- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }