/* ═══════════════════════════════════════════════
   8:15 DESIGN — GROUNDED WISDOM DESIGN SYSTEM
   Golden Ratio Scale (1.618) & Custom Theme Tokens
   ═══════════════════════════════════════════════ */

/* Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  /* Typographic Tokens */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Golden Ratio Layout & Spacing */
  --space-gutter: 1.618rem;
  --space-section: 2.618rem;
  --radius: 0.809rem;

  /* Micro-Animation Presets */
  --scale-hover: 1.02;
  --scale-click: 0.98;
  --transition-spd: 300ms;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);

  /* Theme I: Grounded Wisdom — Structural (Light Mode Defaults) */
  --bg-main: #FDFBF7;
  --bg-card: #FFFFFF;
  --bg-input: #FFFFFF;
  --text-main: #1A1A1A;
  --text-muted: #555555;
  --accent: #D97706;        /* Warm Amber */
  --accent-hover: #B45309;  /* Deep Amber */
  --accent-rgb: 217, 119, 6;
  --border: #EFEBE4;        /* Soft Limestone Warm Grey */
  --shadow-sm: 0 2px 8px rgba(26, 26, 26, 0.02);
  --shadow-md: 0 10px 30px -10px rgba(217, 119, 6, 0.06);
  --shadow-lg: 0 20px 40px -15px rgba(217, 119, 6, 0.08);
}

/* Theme I: Grounded Wisdom — Authoritative (Dark Mode Overrides) */
.theme-dark {
  --bg-main: #0B0F19;       /* Obsidian Space Slate */
  --bg-card: #111827;       /* Rich Graphite Card */
  --bg-input: #1F2937;      /* Input Field Charcoal */
  --text-main: #F8FAFC;     /* Crisp Linen White */
  --text-muted: #94A3B8;    /* Cool Steel Grey */
  --accent: #D4AF7A;        /* Muted Brass Gold */
  --accent-hover: #C59B63;  /* Gilded Gold */
  --accent-rgb: 212, 175, 122;
  --border: #1F2937;        /* Obsidian Dark Border */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 40px -15px rgba(212, 175, 122, 0.04);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.618;
  overflow-x: hidden;
  transition: background-color var(--transition-spd) var(--transition-ease),
              color var(--transition-spd) var(--transition-ease),
              border-color var(--transition-spd) var(--transition-ease);
}

/* Typographic Hierarchy */
h1, h2, h3, h4, h5, h6, .font-heading {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* Layout Utilities */
.custom-gutter { gap: var(--space-gutter); }
.custom-section-gap { gap: var(--space-section); }
.custom-padding { padding: var(--space-gutter); }
.custom-radius { border-radius: var(--radius); }

/* Sticky Premium Header */
.brand-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(253, 251, 247, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition-spd) var(--transition-ease),
              border-color var(--transition-spd) var(--transition-ease);
}

.theme-dark .brand-header {
  background-color: rgba(11, 15, 25, 0.8);
}

/* Tab Switching Fade Transitions */
.section-view {
  opacity: 0;
  transform: translateY(12px);
  display: none;
  transition: opacity var(--transition-spd) var(--transition-ease),
              transform var(--transition-spd) var(--transition-ease);
}

.section-view.active {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

/* Premium Buttons & Cards */
.btn-action {
  transition: transform var(--transition-spd) var(--transition-ease),
              background-color var(--transition-spd) var(--transition-ease),
              color var(--transition-spd) var(--transition-ease),
              border-color var(--transition-spd) var(--transition-ease),
              box-shadow var(--transition-spd) var(--transition-ease);
  cursor: pointer;
}
.btn-action:hover {
  transform: scale(var(--scale-hover));
  box-shadow: var(--shadow-sm);
}
.btn-action:active {
  transform: scale(var(--scale-click));
}

.card-interactive {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-spd) var(--transition-ease),
              box-shadow var(--transition-spd) var(--transition-ease),
              background-color var(--transition-spd) var(--transition-ease),
              border-color var(--transition-spd) var(--transition-ease);
  cursor: pointer;
}
.card-interactive:hover {
  transform: scale(var(--scale-hover));
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}
.card-interactive:active {
  transform: scale(var(--scale-click));
}

/* Theme Slide Toggle Custom Styling */
.switch-container {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.switch-track {
  width: 46px;
  height: 24px;
  background-color: var(--border);
  border-radius: 100px;
  position: relative;
  cursor: pointer;
  transition: background-color var(--transition-spd) var(--transition-ease);
}

.switch-thumb {
  width: 18px;
  height: 18px;
  background-color: var(--accent);
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: transform var(--transition-spd) var(--transition-ease),
              background-color var(--transition-spd) var(--transition-ease);
}

.theme-dark .switch-thumb {
  transform: translateX(22px);
}

/* Vertical Experience Timeline */
.timeline-container {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--border);
  transition: border-color var(--transition-spd) var(--transition-ease);
}

.timeline-dot {
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg-main);
  transition: background-color var(--transition-spd) var(--transition-ease),
              border-color var(--transition-spd) var(--transition-ease);
}

.timeline-item:hover .timeline-dot {
  transform: scale(1.3);
  box-shadow: 0 0 8px var(--accent);
}

/* Premium Form Elements */
.input-premium {
  width: 100%;
  padding: 0.809rem 1rem;
  background-color: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: calc(var(--radius) / 2);
  color: var(--text-main);
  font-family: var(--font-body);
  transition: border-color var(--transition-spd) var(--transition-ease),
              box-shadow var(--transition-spd) var(--transition-ease),
              background-color var(--transition-spd) var(--transition-ease);
  outline: none;
}

.input-premium:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
}

/* Bento Style Metrics */
.metric-box {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(var(--accent-rgb), 0.02) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-gutter);
  transition: transform var(--transition-spd) var(--transition-ease),
              border-color var(--transition-spd) var(--transition-ease),
              box-shadow var(--transition-spd) var(--transition-ease);
}

.metric-box:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* Elegant custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 100px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Navigation Menu Transitions */
.nav-link {
  position: relative;
  transition: color var(--transition-spd) var(--transition-ease);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition-spd) var(--transition-ease);
}

.nav-link.active {
  color: var(--accent);
  font-weight: 600;
}

.nav-link.active::after,
.nav-link:hover::after {
  width: 100%;
}