:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --container: 720px;
  --section-pad: 112px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Studio palette: ink + paper + copper accent */
  --paper: #f4f3ef;
  --surface: #ffffff;
  --ink: #101114;
  --ink-deep: #0a0b0d;
  --ink-soft: #191b1f;

  --text: #14161a;
  --text-2: #565a63;
  --text-3: #8b909a;
  --text-inv: #f4f3ef;
  --text-inv-2: #a9adb6;

  --line: rgba(16, 17, 20, 0.1);
  --line-strong: rgba(16, 17, 20, 0.18);
  --line-inv: rgba(255, 255, 255, 0.12);

  --accent: #d4693a;
  --accent-soft: #e2884f;
  --accent-dim: rgba(212, 105, 58, 0.12);
  --success: #46a46f;
  --error: #e85c5c;

  --shadow-sm: 0 2px 8px rgba(16, 17, 20, 0.06);
  --shadow-md: 0 12px 32px rgba(16, 17, 20, 0.08);
  --shadow-lg: 0 24px 60px rgba(16, 17, 20, 0.12);

  --dur-fast: 150ms;
  --dur-base: 300ms;
  --dur-slow: 500ms;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-padding-top: 80px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font);
  background: var(--ink);
  color: var(--text-inv);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--radius-sm); }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section {
  padding: var(--section-pad) 0;
  position: relative;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-label::after {
  content: '';
  flex: 1;
  max-width: 80px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent) 0%, transparent 100%);
}

.section-title {
  font-size: clamp(1.9rem, 4.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.12;
  color: var(--text-inv);
  margin-bottom: 20px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-inv-2);
  line-height: 1.7;
  max-width: 540px;
  margin-bottom: 48px;
}

/* ═══ SCROLL PROGRESS ═══ */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  z-index: 10001;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ═══ NAVBAR ═══ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9995;
  padding: 0 24px;
  color: var(--text-inv);
  transition: background var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out);
}

.navbar.scrolled {
  background: rgba(16, 17, 20, 0.9);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  box-shadow: 0 1px 0 var(--line-inv), var(--shadow-sm);
}

.navbar-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.navbar-logo {
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  font-family: var(--font-mono);
  color: var(--accent);
  padding: 6px 10px;
  border: 1px solid currentColor;
  border-radius: var(--radius-sm);
  line-height: 1;
  transition: opacity var(--dur-base);
}

.navbar-logo:hover { opacity: 0.75; }

.navbar-links { display: flex; gap: 4px; }

.nav-link {
  padding: 8px 16px;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  opacity: 0.72;
  border-radius: var(--radius-full);
  transition: opacity var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out);
}

.nav-link:hover { opacity: 1; background: rgba(255, 255, 255, 0.08); }

/* ═══ HERO ═══ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  text-align: center;
  padding: 120px 0 100px;
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--text-inv);
}

.hero-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 25%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 25%, transparent 75%);
}

.hero-glow {
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  top: -220px;
  left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(212, 105, 58, 0.22) 0%, transparent 65%);
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--accent-soft);
  margin-bottom: 26px;
  animation: fadeUp 0.8s var(--ease-out) 0.2s both;
}

.hero-title {
  font-size: clamp(2.4rem, 7vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.045em;
  line-height: 1.05;
  color: var(--text-inv);
  margin-bottom: 22px;
  animation: fadeUp 0.9s var(--ease-out) 0.35s both;
}

.hero-title-accent { color: var(--accent); }

.hero-subtitle {
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--text-inv-2);
  max-width: 580px;
  margin: 0 auto 40px;
  line-height: 1.7;
  animation: fadeUp 0.9s var(--ease-out) 0.55s both;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 96px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
  animation: fadeUp 1s var(--ease-out) 1.6s both;
}

.scroll-mouse {
  width: 22px;
  height: 34px;
  border: 1.5px solid rgba(255, 255, 255, 0.25);
  border-radius: 11px;
  position: relative;
}

.scroll-dot {
  position: absolute;
  width: 3px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  left: 50%;
  top: 6px;
  transform: translateX(-50%);
  animation: scrollBounce 2s var(--ease-out) infinite;
}

.hero-scroll-indicator span {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.4);
}

/* ═══ REVEAL ═══ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ═══ FORM SECTION ═══ */

.form-section {
  background: var(--ink);
  border-top: 1px solid var(--line-inv);
  border-bottom: 1px solid var(--line-inv);
}

.form-wrapper {
  max-width: 680px;
  margin: 0 auto;
}

.idea-form {
  display: flex;
  flex-direction: column;
  gap: 28px;
  background: var(--ink-soft);
  border: 1px solid var(--line-inv);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  position: relative;
  overflow: hidden;
}

.idea-form::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-inv-2);
}

.required { color: var(--accent-soft); }

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-inv);
  background: var(--ink-deep);
  border: 1px solid var(--line-inv);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast), background var(--dur-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-3);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
  background: var(--ink-soft);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a9adb6' stroke-width='1.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 18px;
  padding-right: 44px;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font);
  line-height: 1.7;
}

.form-hint {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-3);
  margin-top: 6px;
}

.checkbox-group {
  flex-direction: row;
  align-items: flex-start;
  gap: 12px;
}

.checkbox-input {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--accent);
  border: 1px solid var(--line-inv);
  border-radius: 4px;
  background: var(--ink-deep);
  cursor: pointer;
}

.checkbox-label {
  font-size: 0.88rem;
  color: var(--text-inv-2);
  line-height: 1.5;
  cursor: pointer;
}

.checkbox-label a { color: var(--accent-soft); text-decoration: underline; }
.checkbox-label a:hover { color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 32px;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--dur-base) var(--ease-out);
  position: relative;
}

.btn > span { position: relative; z-index: 1; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(212, 105, 58, 0.35);
}

.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-ghost {
  background: transparent;
  color: var(--text-inv);
  border-color: var(--line-inv);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

.btn-loader { display: none; }
.btn.submitting .btn-text { display: none; }
.btn.submitting .btn-loader { display: flex; }

.spinner {
  width: 20px;
  height: 20px;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.form-footer {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  text-align: center;
  margin-top: 8px;
  line-height: 1.6;
}

/* Success / Error States */

.success-state,
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 60px 40px;
  gap: 24px;
  animation: fadeUp 0.6s var(--ease-out) both;
}

.success-icon,
.error-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  border: 1px solid;
}

.success-icon {
  color: var(--success);
  border-color: rgba(70, 164, 111, 0.4);
  background: rgba(70, 164, 111, 0.1);
}

.error-icon {
  color: var(--error);
  border-color: rgba(232, 92, 92, 0.4);
  background: rgba(232, 92, 92, 0.1);
}

.success-icon svg,
.error-icon svg {
  width: 28px;
  height: 28px;
}

.success-title,
.error-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-inv);
}

.success-message,
.error-message {
  font-size: 1rem;
  color: var(--text-inv-2);
  max-width: 400px;
  line-height: 1.6;
}

/* ═══ EXAMPLES ═══ */

.examples-section {
  background: var(--ink-soft);
  border-top: 1px solid var(--line-inv);
  border-bottom: 1px solid var(--line-inv);
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.example-card {
  background: var(--ink);
  border: 1px solid var(--line-inv);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.example-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease-out);
}

.example-card:hover {
  transform: translateY(-4px);
  border-color: rgba(212, 105, 58, 0.45);
  box-shadow: var(--shadow-lg);
}

.example-card:hover::before { transform: scaleX(1); }

.example-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border: 1px solid rgba(212, 105, 58, 0.25);
  border-radius: var(--radius-md);
  color: var(--accent-soft);
}

.example-icon svg { width: 24px; height: 24px; }

.example-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-inv);
  letter-spacing: -0.01em;
}

.example-desc {
  font-size: 0.88rem;
  color: var(--text-inv-2);
  line-height: 1.6;
  flex: 1;
}

.example-tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(212, 105, 58, 0.12);
  color: var(--accent-soft);
  border: 1px solid rgba(212, 105, 58, 0.2);
  width: fit-content;
  margin-top: auto;
}

/* ═══ FOOTER ═══ */

.footer {
  padding: 40px 0;
  background: var(--ink-deep);
  color: var(--text-inv-2);
  border-top: 1px solid var(--line-inv);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.8rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid rgba(212, 105, 58, 0.4);
  border-radius: var(--radius-sm);
}

.footer-name {
  font-weight: 600;
  color: var(--text-inv);
  letter-spacing: -0.01em;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  opacity: 0.7;
  transition: opacity var(--dur-base), color var(--dur-base);
}

.footer-links a:hover { opacity: 1; color: var(--accent-soft); }

.footer-copy { opacity: 0.6; }

/* ═══ KEYFRAMES ═══ */

@keyframes fadeUp {
  0%   { opacity: 0; transform: translateY(16px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes scrollBounce {
  0%   { transform: translateX(-50%) translateY(0); opacity: 1; }
  75%  { transform: translateX(-50%) translateY(14px); opacity: 0.15; }
  100% { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* ═══ RESPONSIVE ═══ */

@media (max-width: 900px) {
  .examples-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root { --section-pad: 80px; }

  .hero { padding: 110px 0 90px; min-height: 92vh; }
  .hero-scroll-indicator { display: none; }
  .hero-glow { width: 420px; height: 420px; top: -140px; left: 50%; transform: translateX(-50%); }

  .navbar.scrolled { backdrop-filter: none; -webkit-backdrop-filter: none; }

  .form-row { grid-template-columns: 1fr; }
  .idea-form { padding: 32px 24px; }

  .examples-grid { grid-template-columns: 1fr; }

  .footer-content { flex-direction: column; text-align: center; }
}

@media (max-width: 600px) {
  .navbar-inner { height: 60px; }
  .nav-link { padding: 6px 12px; font-size: 0.78rem; }

  .hero { padding: 96px 0 72px; }
  .hero-title { font-size: clamp(2rem, 8vw, 3rem); }

  .idea-form { padding: 28px 20px; }
  .form-input, .form-select, .form-textarea { font-size: 1rem; padding: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-grid, .hero-glow { display: none; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .scroll-progress, .hero-grid, .hero-glow, .hero-scroll-indicator,
  .navbar, .footer { display: none !important; }
  body { color: #000; background: #fff !important; }
  .hero, .form-section, .examples-section { background: #fff !important; color: #000 !important; }
}