/* =============================================
   1618 PARTNERS — HIDDEN COST AGENT
   Brand: C9 Wave Glass Palette
   ============================================= */

:root,
[data-theme="light"] {
  /* Brand colours */
  --color-arc1: #00A0C4;
  --color-arc2: #007898;
  --color-arc3: #30C0D4;
  --color-deep: #003040;
  --color-abyss: #001C2E;
  --color-arc3-dark: #5DD4E4;

  /* Surfaces */
  --color-bg: #FFFFFF;
  --color-surface: #F4FAFB;
  --color-surface-2: #E8F5F8;
  --color-border: #C8E8EF;
  --color-divider: #D4EEF4;

  /* Text */
  --color-text: #003040;
  --color-text-muted: #4A6E7A;
  --color-text-faint: #8AACB8;

  /* Primary */
  --color-primary: #00A0C4;
  --color-primary-hover: #007898;
  --color-primary-active: #005870;

  /* Type */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* 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, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);
  --text-hero: clamp(2.5rem, 1rem + 4vw, 4.5rem);

  /* Spacing */
  --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;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Shadow */
  --shadow-sm: 0 1px 3px rgba(0, 48, 64, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 48, 64, 0.1);
  --shadow-lg: 0 12px 40px rgba(0, 48, 64, 0.14);

  /* Transition */
  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg: #001C2E;
  --color-surface: #00263A;
  --color-surface-2: #003040;
  --color-border: #004A60;
  --color-divider: #003A50;
  --color-text: #D0EEF5;
  --color-text-muted: #7AB8C8;
  --color-text-faint: #3A7A90;
  --color-primary: #5DD4E4;
  --color-primary-hover: #30C0D4;
  --color-primary-active: #00A0C4;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #001C2E;
    --color-surface: #00263A;
    --color-surface-2: #003040;
    --color-border: #004A60;
    --color-divider: #003A50;
    --color-text: #D0EEF5;
    --color-text-muted: #7AB8C8;
    --color-text-faint: #3A7A90;
    --color-primary: #5DD4E4;
    --color-primary-hover: #30C0D4;
    --color-primary-active: #00A0C4;
  }
}

/* =============================================
   LAYOUT
   ============================================= */

.container {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* =============================================
   HEADER
   ============================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-4) 0;
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  height: 48px;
  width: auto;
}

[data-theme="light"] .logo-dark,
:root:not([data-theme]) .logo-dark {
  display: none;
}

[data-theme="dark"] .logo-light {
  display: none;
}

[data-theme="dark"] .logo-dark {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .logo-light { display: none; }
  :root:not([data-theme]) .logo-dark { display: block; }
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: color var(--transition), background var(--transition);
}

.theme-toggle:hover {
  background: var(--color-surface);
  color: var(--color-primary);
}

/* =============================================
   SCREENS
   ============================================= */

.screen {
  display: none;
  min-height: calc(100dvh - 80px);
  padding: var(--space-16) 0 var(--space-20);
}

.screen.active {
  display: block;
}

/* =============================================
   LANDING SCREEN
   ============================================= */

.landing-content {
  max-width: 640px;
}

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.display-title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 300;
  color: var(--color-text);
  line-height: 1.08;
  margin-bottom: var(--space-4);
}

.sub-heading {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.divider {
  width: 48px;
  height: 2px;
  background: var(--color-arc1);
  margin-bottom: var(--space-8);
}

.body-text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-5);
  max-width: 60ch;
}

.time-note {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
}

.pillar-tag {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-text-faint);
  margin-top: var(--space-8);
}

/* =============================================
   BUTTONS
   ============================================= */

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary);
  color: #FFFFFF;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: background var(--transition), transform var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  background: var(--color-primary-active);
  transform: translateY(0);
}

.btn-primary.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--color-text-muted);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 400;
  border: 1px solid var(--color-border);
  transition: color var(--transition), border-color var(--transition);
  cursor: pointer;
}

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

/* =============================================
   QUESTION SCREEN
   ============================================= */

.question-wrapper {
  max-width: 600px;
  margin: 0 auto;
}

.progress-bar {
  height: 2px;
  background: var(--color-border);
  border-radius: 2px;
  margin-bottom: var(--space-3);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-arc2), var(--color-arc1));
  border-radius: 2px;
  transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  width: 0%;
}

.progress-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-10);
}

.question-card {
  animation: fadeUp 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.question-context {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.question-text {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

.question-guidance {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-8);
  max-width: 52ch;
}

.input-wrapper {
  margin-bottom: var(--space-10);
}

.input-wrapper input[type="number"],
.input-wrapper input[type="text"] {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-lg);
  font-family: var(--font-display);
  font-weight: 300;
  transition: border-color var(--transition), box-shadow var(--transition);
  -moz-appearance: textfield;
}

.input-wrapper input[type="number"]::-webkit-outer-spin-button,
.input-wrapper input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 160, 196, 0.15);
}

.input-prefix {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-prefix:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 160, 196, 0.15);
}

.prefix-label {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  border-right: 1px solid var(--color-border);
  white-space: nowrap;
}

.input-prefix input {
  flex: 1;
  padding: var(--space-4) var(--space-5);
  border: none;
  background: transparent;
  color: var(--color-text);
  font-size: var(--text-lg);
  font-family: var(--font-display);
  font-weight: 300;
  -moz-appearance: textfield;
}

.input-prefix input:focus {
  outline: none;
}

.input-prefix input::-webkit-outer-spin-button,
.input-prefix input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.suffix-label {
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  border-left: 1px solid var(--color-border);
  white-space: nowrap;
}

.question-nav {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

/* =============================================
   GATE SCREEN
   ============================================= */

.gate-wrapper {
  max-width: 520px;
  margin: 0 auto;
}

.gate-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  margin-top: var(--space-4);
}

.gate-body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.gate-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.form-group input {
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-base);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 160, 196, 0.15);
}

.form-group input::placeholder {
  color: var(--color-text-faint);
}

.privacy-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.6;
}

/* =============================================
   CALCULATING SCREEN
   ============================================= */

.calculating-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

.wave-animation {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  margin-bottom: var(--space-10);
  height: 48px;
}

.wave {
  width: 6px;
  border-radius: 6px;
  background: var(--color-primary);
  animation: waveBar 1.2s ease-in-out infinite;
}

.wave.w1 { height: 24px; background: var(--color-arc2); animation-delay: 0s; }
.wave.w2 { height: 40px; background: var(--color-arc1); animation-delay: 0.2s; }
.wave.w3 { height: 18px; background: var(--color-arc3); animation-delay: 0.4s; }

@keyframes waveBar {
  0%, 100% { transform: scaleY(0.4); opacity: 0.6; }
  50% { transform: scaleY(1); opacity: 1; }
}

.calculating-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.calculating-body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* =============================================
   RESULTS SCREEN
   ============================================= */

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

.results-headline {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  margin-top: var(--space-3);
}

.results-subline {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-10);
  max-width: 58ch;
}

/* Key number card */
.key-number-card {
  background: var(--color-arc2);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-10);
  margin-bottom: var(--space-8);
  text-align: center;
}

.key-number-label {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.8;
  margin-bottom: var(--space-4);
}

.key-number {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 300;
  line-height: 1;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.key-number-sub {
  font-size: var(--text-sm);
  opacity: 0.7;
}

/* Three layers */
.layers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

@media (max-width: 600px) {
  .layers-grid { grid-template-columns: 1fr; }
}

.layer-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}

.layer-1 { border-top: 3px solid var(--color-arc1); }
.layer-2 { border-top: 3px solid var(--color-arc2); }
.layer-3 { border-top: 3px solid var(--color-arc3); }

.layer-num {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.layer-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.layer-value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.layer-desc {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.65;
}

/* Annual card */
.annual-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.annual-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}

.annual-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

@media (max-width: 500px) {
  .annual-grid { grid-template-columns: 1fr; }
}

.annual-label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.annual-value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--color-text);
}

.annual-insight {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-5);
  font-style: italic;
}

/* Advantage card */
.advantage-card {
  background: linear-gradient(135deg, var(--color-surface-2) 0%, var(--color-surface) 100%);
  border: 1px solid var(--color-arc3);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.advantage-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.advantage-body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* CTA card */
.cta-card {
  background: var(--color-abyss);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  margin-bottom: var(--space-8);
}

[data-theme="dark"] .cta-card {
  background: var(--color-surface-2);
}

.cta-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  margin-bottom: var(--space-4);
  color: #FFFFFF;
}

[data-theme="dark"] .cta-title {
  color: var(--color-text);
}

.cta-body {
  font-size: var(--text-sm);
  opacity: 0.8;
  line-height: 1.7;
  margin-bottom: var(--space-4);
  max-width: 52ch;
}

[data-theme="dark"] .cta-body {
  color: var(--color-text-muted);
  opacity: 1;
}

.contact-block {
  border-top: 1px solid rgba(255,255,255,0.15);
  border-bottom: 1px solid rgba(255,255,255,0.15);
  padding: var(--space-6) 0;
  margin-bottom: var(--space-6);
}

[data-theme="dark"] .contact-block {
  border-color: var(--color-divider);
}

.contact-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: #FFFFFF;
  margin-bottom: var(--space-1);
}

[data-theme="dark"] .contact-name {
  color: var(--color-text);
}

.contact-role {
  font-size: var(--text-xs);
  opacity: 0.65;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.contact-link {
  font-size: var(--text-sm);
  color: var(--color-arc3);
  text-decoration: none;
  transition: color var(--transition);
}

.contact-link:hover {
  color: var(--color-arc3-dark);
  text-decoration: underline;
}

/* =============================================
   FOOTER
   ============================================= */

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) 0;
  margin-top: var(--space-16);
}

.footer-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-inner p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-inner a {
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--color-primary);
}

/* =============================================
   RESULT NUMBER ANIMATION
   ============================================= */

.count-up {
  display: inline-block;
}