/* Art direction: Editorial Warmth — High-end magazine meets modern SaaS
   Palette: Warm cream surfaces, deep forest green primary, coral accents
   Typography: Fraunces (display, editorial serif) + Outfit (body, geometric sans)
   Density: Generous, editorial — dramatic whitespace, bold typographic moments */

/* ========================================
   DESIGN TOKENS
   ======================================== */

:root {
  /* Type Scale — dramatic editorial range */
  --text-xs:   clamp(0.72rem,  0.68rem + 0.2vw, 0.8rem);
  --text-sm:   clamp(0.85rem, 0.8rem  + 0.25vw, 0.95rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.1rem);
  --text-lg:   clamp(1.15rem, 1rem    + 0.75vw, 1.45rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.25rem);
  --text-3xl:  clamp(3rem,     1rem    + 5.5vw,  6.5rem);
  --text-4xl:  clamp(3.5rem,   1.5rem  + 7vw,    8rem);

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

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-interactive: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 500ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Font families */
  --font-display: 'Fraunces', 'Georgia', serif;
  --font-body: 'Outfit', 'Helvetica Neue', sans-serif;
}

/* ========================================
   LIGHT MODE (default)
   ======================================== */

:root, [data-theme="light"] {
  /* Surfaces — warm cream palette */
  --color-bg:               #FAF7F2;
  --color-surface:          #F3EDE4;
  --color-surface-2:        #EBE4D8;
  --color-surface-offset:   #E3DBCE;
  --color-surface-offset-2: #D9CFC0;
  --color-surface-dynamic:  #CFC4B3;
  --color-divider:          #DDD5C8;
  --color-border:           #CFC4B3;

  /* Text */
  --color-text:           #1A1A17;
  --color-text-muted:     #5C5A52;
  --color-text-faint:     #6B6960;
  --color-text-inverse:   #FAF7F2;

  /* Primary — Deep Forest Green */
  --color-primary:          #1B4332;
  --color-primary-hover:    #14352A;
  --color-primary-active:   #0D2820;
  --color-primary-light:    #2D6A4F;
  --color-primary-highlight: #E8F0EB;

  /* Accent — Warm Coral (darkened for 4.5:1 on cream) */
  --color-accent:           #A84830;
  --color-accent-hover:     #913D27;
  --color-accent-highlight: #FCEAE5;

  /* Error */
  --color-error:            #C1292E;
  --color-error-hover:      #A82228;
  --color-error-highlight:  #F8E0E0;

  /* Success */
  --color-success:          #2D6A4F;
  --color-success-highlight:#E8F0EB;

  /* Category accent colors */
  --color-cat-purple:     #7B6BA6;
  --color-cat-blue:       #4A7FB5;
  --color-cat-coral:      #C96B55;
  --color-cat-teal:       #3A8F81;
  --color-cat-amber:      #C49234;
  --color-cat-indigo:     #5C5FA8;

  /* Shadows — warmer */
  --shadow-sm: 0 1px 3px rgba(26, 26, 23, 0.04), 0 1px 2px rgba(26, 26, 23, 0.02);
  --shadow-md: 0 4px 16px rgba(26, 26, 23, 0.06), 0 2px 4px rgba(26, 26, 23, 0.03);
  --shadow-lg: 0 16px 48px rgba(26, 26, 23, 0.10), 0 4px 12px rgba(26, 26, 23, 0.04);
  --shadow-xl: 0 24px 64px rgba(26, 26, 23, 0.14), 0 8px 20px rgba(26, 26, 23, 0.06);

  /* Dark section (stats, CTA) */
  --color-dark-bg:         #1B2A1F;
  --color-dark-surface:    #243429;
  --color-dark-text:       #E8E4DD;
  --color-dark-text-muted: #A8A498;
}

/* ========================================
   DARK MODE
   ======================================== */

[data-theme="dark"] {
  --color-bg:               #141412;
  --color-surface:          #1C1C19;
  --color-surface-2:        #242420;
  --color-surface-offset:   #2C2C27;
  --color-surface-offset-2: #35352F;
  --color-surface-dynamic:  #3D3D36;
  --color-divider:          #2C2C27;
  --color-border:           #3D3D36;

  --color-text:           #EAE7E0;
  --color-text-muted:     #A8A498;
  --color-text-faint:     #6E6C64;
  --color-text-inverse:   #141412;

  --color-primary:          #52B788;
  --color-primary-hover:    #6BC99A;
  --color-primary-active:   #40916C;
  --color-primary-light:    #74C69D;
  --color-primary-highlight: #1A2E22;

  --color-accent:           #F4845F;
  --color-accent-hover:     #F09372;
  --color-accent-highlight: #2E1F1A;

  --color-error:            #F47174;
  --color-error-hover:      #E05558;
  --color-error-highlight:  #2E1A1A;

  --color-success:          #52B788;
  --color-success-highlight:#1A2E22;

  --color-cat-purple:     #A99CCC;
  --color-cat-blue:       #7AADDB;
  --color-cat-coral:      #E09580;
  --color-cat-teal:       #6BB8AA;
  --color-cat-amber:      #DDB05C;
  --color-cat-indigo:     #9294D4;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.5);

  --color-dark-bg:         #0D0D0B;
  --color-dark-surface:    #161614;
  --color-dark-text:       #EAE7E0;
  --color-dark-text-muted: #8A8780;
}

/* Dark mode via prefers-color-scheme removed — handled by inline
   <script> in <head> that sets data-theme before first paint. */

/* ========================================
   GRAIN TEXTURE OVERLAY
   Uses a tiny 150x150 inline SVG data-URI tiled via CSS.
   Zero runtime cost — no feTurbulence, no GPU filter.
   ======================================== */

.grain-overlay {
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.30;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

[data-theme="dark"] .grain-overlay {
  opacity: 0.12;
  mix-blend-mode: soft-light;
}

/* ========================================
   COMPONENT STYLES
   ======================================== */

/* Container */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-10);
  }
}

/* Section spacing */
.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
  position: relative;
}

/* Buttons — refined pill style with weight */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  border: none;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              background-color var(--transition-interactive),
              border-color var(--transition-interactive);
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--transition-fast);
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
}

.btn:hover::after {
  opacity: 1;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn:disabled,
.btn[disabled] {
  opacity: 0.45;
  pointer-events: none;
  cursor: not-allowed;
}

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

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-text-faint);
}

.btn-lg {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-10);
  letter-spacing: 0.02em;
}

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

.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.form-input,
.form-select,
.form-textarea {
  font-family: var(--font-body);
  font-size: var(--text-base);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-highlight);
}

.form-select:invalid {
  color: var(--color-text-faint);
}

.form-select option {
  color: var(--color-text);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 4px var(--color-error-highlight);
}

/* Form validation shake */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(2px); }
}

.shake {
  animation: shake 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  display: none;
}

.form-error.visible {
  display: block;
}

/* Section headings — editorial style */
.section-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.section-label::before {
  content: '';
  width: 32px;
  height: 1.5px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.section-header .section-label {
  justify-content: center;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.section-subtitle {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--color-text-muted);
  max-width: 55ch;
  line-height: 1.65;
}

/* Scroll reveal animations */
.js-reveal-hidden {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.js-reveal-hidden[data-reveal="scale"] {
  transform: scale(0.92);
}

.js-reveal-hidden[data-reveal="left"] {
  transform: translateX(-32px);
}

.js-reveal-hidden[data-reveal="right"] {
  transform: translateX(32px);
}

.js-reveal-visible {
  opacity: 1 !important;
  transform: translateY(0) translateX(0) scale(1) !important;
}

/* CTA arrow micro-interaction */
.btn svg {
  transition: transform var(--transition-interactive);
}

.btn:hover svg {
  transform: translateX(3px);
}