/* ==========================================================================
   INHABIT PRACTICE — Design System & Custom Styles
   Minimalist, Serene, Swiss-inspired aesthetic for Mindful Movement
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,400&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --color-bg: #F9F8F5;
  --color-bg-alt: #F1ECE3;
  --color-surface: #FFFFFF;
  --color-surface-soft: #F5F1EA;
  --color-text-main: #1C2220;
  --color-text-muted: #5C6763;
  --color-text-light: #8A9691;
  --color-border: #E5E0D6;
  --color-border-dark: #2E3734;
  --color-accent-sage: #4E6057;
  --color-accent-sage-light: #EBF0ED;
  --color-accent-clay: #B66C52;
  --color-accent-clay-light: #F9F0EB;
  --color-dark-bg: #181E1C;
  --color-dark-surface: #222B28;
  
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-subtle: 0 4px 20px -2px rgba(28, 34, 32, 0.04), 0 2px 6px -1px rgba(28, 34, 32, 0.02);
  --shadow-card: 0 12px 36px -4px rgba(28, 34, 32, 0.06), 0 4px 12px -2px rgba(28, 34, 32, 0.03);
  --shadow-book: 0 20px 40px -10px rgba(28, 34, 32, 0.18), 0 1px 3px rgba(28, 34, 32, 0.08);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  line-height: 1.65;
  letter-spacing: -0.01em;
  overflow-x: hidden;
}

/* Typography Utilities */
.font-serif {
  font-family: var(--font-serif);
}

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

h1, h2, h3, h4, .serif-heading {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
}

h2 {
  font-size: clamp(2rem, 3.8vw, 3.25rem);
}

h3 {
  font-size: clamp(1.4rem, 2.2vw, 1.85rem);
}

p {
  color: var(--color-text-muted);
}

/* Containers & Spacing */
.container-custom {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1.25rem, 4vw, 3rem);
  padding-right: clamp(1.25rem, 4vw, 3rem);
}

.section-spacing {
  padding-top: clamp(4.5rem, 8vw, 8rem);
  padding-bottom: clamp(4.5rem, 8vw, 8rem);
}

/* Buttons & Links */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background-color: var(--color-text-main);
  color: #FFFFFF;
  padding: 0.95rem 2rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: var(--transition-smooth);
  border: 1px solid var(--color-text-main);
  cursor: pointer;
}

.btn-primary:hover {
  background-color: var(--color-accent-sage);
  border-color: var(--color-accent-sage);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(78, 96, 87, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background-color: transparent;
  color: var(--color-text-main);
  padding: 0.95rem 2rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: var(--transition-smooth);
  border: 1px solid var(--color-border);
  cursor: pointer;
}

.btn-secondary:hover {
  border-color: var(--color-text-main);
  background-color: rgba(28, 34, 32, 0.03);
  transform: translateY(-2px);
}

.btn-clay {
  background-color: var(--color-accent-clay);
  color: #FFFFFF;
  border-color: var(--color-accent-clay);
}

.btn-clay:hover {
  background-color: #9C5840;
  border-color: #9C5840;
  box-shadow: 0 10px 25px -5px rgba(182, 108, 82, 0.3);
}

/* Glass & Card Styling */
.card-minimal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: var(--transition-smooth);
}

.card-minimal:hover {
  border-color: #D1C8BA;
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}

/* Book Cover Styling */
.book-card-container {
  perspective: 1000px;
}

.book-cover-3d {
  border-radius: 8px 16px 16px 8px;
  box-shadow: var(--shadow-book);
  transition: var(--transition-smooth);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.book-cover-3d:hover {
  transform: rotateY(-6deg) scale(1.03);
  box-shadow: 0 25px 50px -12px rgba(28, 34, 32, 0.25);
}

/* Portrait frame */
.portrait-frame {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

/* Header & Nav */
.header-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: var(--transition-smooth);
  background: rgba(249, 248, 245, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(229, 224, 214, 0.5);
}

.header-scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: var(--transition-smooth);
  position: relative;
  padding-bottom: 2px;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text-main);
  transition: var(--transition-smooth);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-text-main);
}

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

/* Posture Explorer Tabs */
.tab-button {
  padding: 0.85rem 1.5rem;
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: var(--transition-smooth);
  white-space: nowrap;
}

.tab-button:hover {
  color: var(--color-text-main);
  border-color: var(--color-text-main);
}

.tab-button.active {
  background-color: var(--color-text-main);
  color: #FFFFFF;
  border-color: var(--color-text-main);
  box-shadow: 0 4px 15px rgba(28, 34, 32, 0.15);
}

.posture-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.8rem;
  border-radius: 9999px;
  background: var(--color-accent-sage-light);
  color: var(--color-accent-sage);
}

/* Accordion Styling */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-smooth);
}

.faq-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--color-text-main);
  transition: var(--transition-smooth);
}

.faq-trigger:hover {
  color: var(--color-accent-sage);
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
  flex-shrink: 0;
  font-size: 1.1rem;
  line-height: 1;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--color-text-main);
  color: #FFFFFF;
  border-color: var(--color-text-main);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out;
  padding-right: 2rem;
}

.faq-content-inner {
  padding-bottom: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

/* Floating Badges & Quotes */
.quote-mark {
  font-family: var(--font-serif);
  font-size: 5rem;
  line-height: 0.5;
  color: #E2DBD0;
  user-select: none;
}

/* Custom Form Styles */
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.95rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text-main);
  transition: var(--transition-smooth);
  outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-text-main);
  box-shadow: 0 0 0 3px rgba(28, 34, 32, 0.06);
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--color-text-main);
}

/* Pill tags */
.tag-pill {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-right: 0.4rem;
  margin-bottom: 0.4rem;
}