/* ==========================================================================
   RSON DESIGN STUDIO — ARCHITECTURAL DESIGN SYSTEM (EDITORIAL LIGHT AESTHETIC)
   ========================================================================== */

/* --------------------------------------------------------------------------
   01. DESIGN TOKENS & VARIABLES
   -------------------------------------------------------------------------- */
:root {
  /* Editorial Light Color Palette (Approved Art Direction) */
  --bg-primary: #FFFFFF;        /* Pure crisp white */
  --bg-secondary: #F8F8F6;      /* Off-white / Warm alabaster surface */
  --bg-tertiary: #F1F1ED;       /* Hover states / subtle fill */
  --bg-dark: #111214;           /* Deep architectural obsidian / ink black */
  --bg-dark-surface: #181A1F;

  /* Typography Colors */
  --text-primary: #111214;      /* Deep ink black */
  --text-secondary: #4E505B;    /* Neutral editorial slate */
  --text-muted: #828490;        /* Muted captions & technical labels */
  --text-inverse: #FFFFFF;      /* White text for dark elements */

  /* Warm Muted Beige / Sand Accent (Exact match to reference) */
  --accent-beige: #A88B64;      /* Warm taupe / architectural gold */
  --accent-beige-hover: #967A53;
  --accent-beige-soft: rgba(168, 139, 100, 0.12);

  /* Studio Brand Identity (Logo Orange) */
  --brand-orange: #DC5400;      /* RSON Logo primary orange */
  --brand-orange-hover: #C24A00;
  --brand-orange-soft: rgba(220, 84, 0, 0.12);

  /* Architectural Hairlines & Dividers */
  --border-hairline: #EBEBE8;
  --border-light: #DCDCD8;
  --border-dark: #111214;

  /* Typography Stacks */
  --font-serif: 'Playfair Display', 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Space Grotesk', 'JetBrains Mono', Consolas, monospace;

  /* Typography Scale */
  --text-hero: clamp(3.2rem, 5.8vw, 5.6rem);
  --text-display: clamp(2.2rem, 3.8vw, 3.8rem);
  --text-h1: clamp(1.8rem, 2.8vw, 2.6rem);
  --text-h2: clamp(1.4rem, 2vw, 1.85rem);
  --text-h3: clamp(1.15rem, 1.4vw, 1.35rem);
  --text-body-lg: 1.05rem;      /* 17px */
  --text-body: 0.95rem;         /* 15.2px */
  --text-body-sm: 0.85rem;      /* 13.6px */
  --text-meta: 0.72rem;         /* 11.5px technical monospace */

  /* Spacing Scale */
  --space-2xs: 0.25rem;   /* 4px */
  --space-xs: 0.5rem;     /* 8px */
  --space-sm: 0.75rem;    /* 12px */
  --space-md: 1rem;       /* 16px */
  --space-lg: 1.5rem;     /* 24px */
  --space-xl: 2rem;       /* 32px */
  --space-2xl: 3rem;      /* 48px */
  --space-3xl: 4.5rem;    /* 72px */
  --space-4xl: 6.5rem;    /* 104px */
  --space-5xl: 8.5rem;    /* 136px */

  /* Container & Structural Bounds */
  --container-max: 1540px;
  --container-pad: clamp(1.25rem, 3.5vw, 3.5rem);
  --header-height: 86px;

  /* Radii (Crisp, Architectural, Refined) */
  --radius-subtle: 3px;
  --radius-pill: 9999px;

  /* Transition Easing */
  --ease-editorial: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   02. RESET & BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

::selection {
  background-color: var(--bg-dark);
  color: var(--bg-primary);
}

/* --------------------------------------------------------------------------
   03. TYPOGRAPHY SYSTEM
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, .font-serif {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.font-sans {
  font-family: var(--font-sans);
}

.font-mono {
  font-family: var(--font-mono);
}

.hero-title {
  font-size: var(--text-hero);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 400;
  color: var(--text-primary);
}

/* Brand accent italic style seen in hero & headings (matches logo orange) */
.text-beige-italic,
.text-orange-italic {
  font-style: italic;
  font-weight: 400;
  color: var(--brand-orange);
}

.section-title {
  font-size: var(--text-display);
  line-height: 1.12;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.section-title em,
h1 em, h2 em, h3 em, h4 em, h5 em, h6 em,
.hero-title em {
  font-style: italic;
  color: var(--brand-orange);
}

/* Eyebrow / Overline */
.eyebrow-line {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.eyebrow-line::before {
  content: '—';
  color: var(--text-muted);
  font-weight: 300;
}

.section-number {
  font-family: var(--font-mono);
  font-size: var(--text-meta);
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
  display: block;
}

/* --------------------------------------------------------------------------
   04. BUTTONS & ACTIONS (MATCHING REFERENCE MOCKUP)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.85rem 1.6rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-subtle);
  transition: all var(--transition-base);
  position: relative;
  white-space: nowrap;
}

/* Solid Black Hero & Header Action Button */
.btn-black {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
  border: 1px solid var(--bg-dark);
}

.btn-black:hover {
  background-color: #23252A;
  border-color: #23252A;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

/* Outline White Hero Button */
.btn-white-outline {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-dark);
}

.btn-white-outline:hover {
  background-color: var(--bg-secondary);
  border-color: var(--bg-dark);
  transform: translateY(-2px);
}

/* Editorial Arrow Link */
.link-editorial {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

.link-editorial span.arrow {
  transition: transform var(--transition-base);
}

.link-editorial:hover span.arrow {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   05. CONTAINER & HAIRLINES
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

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

/* --------------------------------------------------------------------------
   06. ANIMATIONS
   -------------------------------------------------------------------------- */
.fade-up {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease-editorial), transform 0.7s var(--ease-editorial);
}

.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* --------------------------------------------------------------------------
   07. MOBILE RESPONSIVE ADAPTATIONS & HELPERS
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --header-height: 70px;
    --container-pad: 1.15rem;
    --space-2xl: 2rem;
    --space-3xl: 2.75rem;
    --space-4xl: 3.5rem;
    --space-5xl: 4.5rem;
    --text-hero: clamp(2.3rem, 7.5vw, 3.2rem);
    --text-display: clamp(1.85rem, 5.5vw, 2.5rem);
    --text-h1: clamp(1.6rem, 5vw, 2.1rem);
  }

  .mobile-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .mobile-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .mobile-hide {
    display: none !important;
  }
}