/* ==========================================================================
   Ruthvik Interior Studios - Visual & Foundational Design Architecture
   Brand Tagline: "Designing Spaces. Defining Lifestyles."
   ========================================================================== */

/* --------------------------------------------------------------------------
   Font Import (Google Fonts: Cormorant Garamond & Manrope)
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400;1,600&family=Manrope:wght@400;500;600;700&display=swap');

/* --------------------------------------------------------------------------
   Design Tokens & CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* ==========================================================================
     Client-Approved Color System & Architecture Tokens
     ========================================================================== */
  /* Canvases & Surfaces */
  --color-canvas-primary: #F4EFEB;   /* Primary canvas / warm linen */
  --color-canvas-alt: #F8F5F0;       /* Alternate soft canvas */
  --color-surface-warm: #FAF8F5;     /* Surface / warm white */

  /* Terracottas & Siennas (Restrained Calls to Action & Accents) */
  --color-cta-primary: #C0734D;      /* Primary CTA terracotta */
  --color-cta-hover: #B35E38;        /* Stronger CTA / hover terracotta */
  --color-sienna: #9D4D28;           /* Secondary burnt sienna */

  /* Charcoals (Headings, Body Text & Dark Editorial Sections) */
  --color-charcoal-primary: #1F1F1E; /* Primary charcoal */
  --color-charcoal-alt: #2B2A28;     /* Alternate charcoal */

  /* Dividers & Borders */
  --color-hairline: #E3DCD3;         /* Hairline taupe / subtle dividers */
  --color-border-dark: #353432;      /* Hairline divider for charcoal sections */

  /* Text & Contextual Tokens */
  --color-text-main: var(--color-charcoal-primary);
  --color-text-muted: #66615A;       /* High-contrast WCAG-compliant muted body tone */
  --color-text-light: #FAF8F5;       /* Warm white text for dark editorial sections */
  --color-bg-main: var(--color-canvas-primary);

  /* Semantic Aliases for Global Consistency */
  --color-primary: var(--color-charcoal-primary);
  --color-primary-light: var(--color-charcoal-alt);
  --color-secondary: var(--color-text-muted);
  --color-accent: var(--color-cta-primary);
  --color-accent-hover: var(--color-cta-hover);
  --color-accent-secondary: var(--color-sienna);
  --color-border: var(--color-hairline);
  --color-white: var(--color-surface-warm);
  --color-ivory: var(--color-canvas-primary);
  --color-linen: var(--color-canvas-primary);
  --color-soft-canvas: var(--color-canvas-alt);
  --color-warm-white: var(--color-surface-warm);
  --color-beige: var(--color-hairline);

  --color-error: #B93838;
  --color-success: #387F53;

  /* Typography Families */
  --font-heading: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Fluid Editorial Typography Scale using clamp() */
  --font-size-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);   /* ~12px - 13px */
  --font-size-sm: clamp(0.85rem, 0.82rem + 0.18vw, 0.9375rem);   /* ~13.5px - 15px */
  --font-size-base: clamp(0.975rem, 0.94rem + 0.2vw, 1.0625rem); /* ~15.5px - 17px */
  --font-size-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);    /* ~18px - 20px */
  --font-size-xl: clamp(1.35rem, 1.22rem + 0.65vw, 1.65rem);     /* ~21.5px - 26.4px */
  --font-size-2xl: clamp(1.75rem, 1.5rem + 1.25vw, 2.35rem);    /* ~28px - 37.6px */
  --font-size-3xl: clamp(2.25rem, 1.85rem + 2vw, 3.35rem);      /* ~36px - 53.6px */
  --font-size-4xl: clamp(2.85rem, 2.15rem + 3.2vw, 4.5rem);     /* ~45.6px - 72px */

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-heading: 1.15;
  --line-height-body: 1.65;
  --line-height-tight: 1.3;

  /* Layout & Spacing System */
  --container-max-width: 1360px;
  --container-narrow-max-width: 780px;
  --container-padding: clamp(1.25rem, 4vw, 3.5rem);

  --section-padding-y: clamp(3.5rem, 7vw, 7.5rem);
  --section-padding-y-sm: clamp(2.25rem, 4vw, 4.25rem);
  --section-padding-y-lg: clamp(5rem, 10vw, 10.5rem);

  /* Transitions & Motion */
  --transition-fast: 0.2s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-normal: 0.35s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);

  /* Subtle Architectural Borders & Radius */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;

  /* Focus & Elevation (Architectural & Restrained) */
  --shadow-subtle: 0 4px 20px rgba(31, 31, 30, 0.04);
  --shadow-elevation: 0 12px 40px rgba(31, 31, 30, 0.07);

  /* Layering Z-Index Scale */
  --z-negative: -1;
  --z-base: 1;
  --z-header: 100;
  --z-overlay: 200;
  --z-modal: 300;
}

/* ==========================================================================
   CSS Reset & Accessibility Baseline
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.nav-open {
  overflow: hidden !important;
}

/* Accessible Focus States */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   Global Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-primary);
  line-height: var(--line-height-heading);
  font-weight: var(--font-weight-medium);
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1, .h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-regular);
}

h2, .h2 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-medium);
}

h3, .h3 {
  font-size: var(--font-size-2xl);
}

h4, .h4 {
  font-size: var(--font-size-xl);
}

h5, .h5 {
  font-size: var(--font-size-lg);
  font-family: var(--font-body);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.02em;
}

h6, .h6 {
  font-size: var(--font-size-sm);
  font-family: var(--font-body);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

p {
  margin-bottom: 1.25rem;
  color: var(--color-text-main);
  max-width: 70ch;
}

p:last-child {
  margin-bottom: 0;
}

.text-lead {
  font-size: var(--font-size-lg);
  line-height: 1.55;
  color: var(--color-primary);
  font-weight: var(--font-weight-regular);
}

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

.text-subtle {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-sienna);
  margin-bottom: 0.75rem;
}

/* ==========================================================================
   Links & Interactive Text Elements
   ========================================================================== */

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.link-underline {
  position: relative;
  display: inline-block;
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-primary);
  transform: scaleX(1);
  transform-origin: bottom right;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.link-underline:hover {
  color: var(--color-accent);
}

.link-underline:hover::after {
  background-color: var(--color-accent);
}

/* ==========================================================================
   Media & Image Baseline
   ========================================================================== */

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

figure {
  margin: 0;
}

figcaption {
  font-size: var(--font-size-xs);
  color: var(--color-secondary);
  margin-top: 0.5rem;
  font-style: italic;
}

/* ==========================================================================
   Button Architecture (Touch Accessible)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 48px;
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--color-primary);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition: background-color var(--transition-fast), 
              color var(--transition-fast), 
              border-color var(--transition-fast),
              transform var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-cta-primary);
  color: var(--color-surface-warm);
  border-color: var(--color-cta-primary);
  font-weight: var(--font-weight-semibold);
}

.btn-primary:hover {
  background-color: var(--color-cta-hover);
  border-color: var(--color-cta-hover);
  color: var(--color-surface-warm);
}

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

.btn-secondary {
  background-color: var(--color-charcoal-primary);
  color: var(--color-surface-warm);
  border-color: var(--color-charcoal-primary);
}

.btn-secondary:hover {
  background-color: var(--color-charcoal-alt);
  border-color: var(--color-charcoal-alt);
  color: var(--color-surface-warm);
}

.btn-outline {
  border-color: var(--color-charcoal-primary);
  color: var(--color-charcoal-primary);
  background-color: transparent;
}

.btn-outline:hover {
  background-color: var(--color-charcoal-primary);
  border-color: var(--color-charcoal-primary);
  color: var(--color-surface-warm);
}

.btn-outline-terracotta {
  border-color: var(--color-cta-primary);
  color: var(--color-sienna);
  background-color: transparent;
}

.btn-outline-terracotta:hover {
  background-color: var(--color-cta-primary);
  border-color: var(--color-cta-primary);
  color: var(--color-surface-warm);
}

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

.btn:disabled, .btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   Container & Section System
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding-top: var(--section-padding-y);
  padding-bottom: var(--section-padding-y);
  position: relative;
}

.section-sm {
  padding-top: var(--section-padding-y-sm);
  padding-bottom: var(--section-padding-y-sm);
}

.section-lg {
  padding-top: var(--section-padding-y-lg);
  padding-bottom: var(--section-padding-y-lg);
}

/* Section Background Variations (Intentional Client Color System) */
.bg-canvas,
.bg-linen,
.bg-ivory {
  background-color: var(--color-canvas-primary);
  color: var(--color-charcoal-primary);
}

.bg-soft-canvas {
  background-color: var(--color-canvas-alt);
  color: var(--color-charcoal-primary);
}

.bg-surface,
.bg-warm-white,
.bg-white {
  background-color: var(--color-surface-warm);
  color: var(--color-charcoal-primary);
}

.bg-charcoal,
.bg-primary { 
  background-color: var(--color-charcoal-primary); 
  color: var(--color-canvas-primary); 
}

.bg-charcoal h1, .bg-charcoal h2, .bg-charcoal h3, .bg-charcoal h4,
.bg-primary h1, .bg-primary h2, .bg-primary h3, .bg-primary h4 {
  color: var(--color-surface-warm);
}

.bg-charcoal p,
.bg-primary p {
  color: #B5AEA5;
}

.hairline-divider {
  height: 1px;
  background-color: var(--color-hairline);
  border: none;
  margin: 3rem 0;
  width: 100%;
}

.hairline-border-top {
  border-top: 1px solid var(--color-hairline);
}

.hairline-border-bottom {
  border-bottom: 1px solid var(--color-hairline);
}

/* ==========================================================================
   Basic Form Control Baseline
   ========================================================================== */

.form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  color: var(--color-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

/* ==========================================================================
   Accessibility Utilities
   ========================================================================== */

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

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  z-index: var(--z-modal);
  font-weight: var(--font-weight-semibold);
  transition: top var(--transition-fast);
  border-radius: var(--radius-xs);
}

.skip-link:focus {
  top: 1rem;
}