/* 
  Design System for Lembah Hijau Residence
  Based on specs.md
*/

:root {
  /* Colors */
  --color-primary-950: #0D1208;
  --color-primary-900: #141A0F;
  --color-primary-800: #1E2818;
  --color-primary-700: #2A3820;

  --color-accent: #7C9E6B;
  --color-accent-dark: #5A7A4A;
  --color-accent-light: #A8C494;
  --color-accent-tint: rgba(124, 158, 107, 0.10);

  --color-sand-100: #F5F0E8;
  --color-sand-200: #E8DFD0;
  --color-sand-400: #C4B49A;
  --color-sand-600: #8A7660;
  --color-sand-800: #4A3E30;

  --color-surface-card: #1A2215;
  --color-surface-raised: #202D19;
  --color-surface-overlay: rgba(13, 18, 8, 0.80);

  --color-text-primary: #F5F0E8;
  --color-text-secondary: #C4B49A;
  --color-text-muted: #8A7660;
  --color-text-inverse: #141A0F;

  --color-success: #4ADE80;
  --color-error: #F87171;
  --color-warning: #FBBF24;

  /* Typography */
  --font-display: 'Cormorant Garamond', serif;
  --font-body: 'DM Sans', sans-serif;

  --text-xs: 0.6875rem;
  --text-sm: 0.8125rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.625rem;
  --text-3xl: 2rem;
  --text-4xl: 2.625rem;
  --text-5xl: 3.5rem;
  --text-6xl: 5rem;
  --text-7xl: 6.5rem;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;
  --space-40: 160px;

  /* Radius */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.25);
  --shadow-sm: 0 2px 6px rgba(0,0,0,0.30);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.40);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.45);
  --shadow-accent: 0 4px 24px rgba(124,158,107,0.20);

  /* Animations */
  --dur-instant: 100ms;
  --dur-fast: 150ms;
  --dur-base: 200ms;
  --dur-moderate: 300ms;
  --dur-enter: 400ms;
  --dur-slow: 600ms;

  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-enter: cubic-bezier(0, 0, 0.2, 1);
  --ease-exit: cubic-bezier(0.4, 0, 1, 1);
  --ease-spring: cubic-bezier(0.34, 1.2, 0.64, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-primary-900);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .display-font {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.05;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--dur-base) var(--ease-standard);
}

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

img {
  max-width: 100%;
  display: block;
}

/* Layout Utilities */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-12);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-5);
  }
}

.section-py {
  padding-top: var(--space-32);
  padding-bottom: var(--space-32);
}

@media (max-width: 768px) {
  .section-py {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 72px;
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: all var(--dur-moderate) var(--ease-standard);
}

.navbar--scrolled {
  background-color: var(--color-primary-800);
  border-bottom: 1px solid var(--color-primary-700);
  height: 64px;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text-primary);
}

.nav-links {
  display: flex;
  gap: var(--space-8);
}

@media (max-width: 1024px) {
  .nav-links {
    display: none;
  }
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link.active {
  color: var(--color-accent-light);
  border-bottom: 1.5px solid var(--color-accent);
}

.btn-navbar {
  padding: var(--space-2) var(--space-6);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
}

.navbar--scrolled .btn-navbar {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

/* Hero Section */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  position: relative;
  overflow: hidden;
  background-image: linear-gradient(to top, var(--color-surface-overlay), transparent), url('assets/hero.png');
  background-size: cover;
  background-position: center;
}

.hero .container {
  padding-bottom: var(--space-24);
  position: relative;
  z-index: 2;
}

.hero-label {
  color: var(--color-accent-light);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.hero-title {
  font-size: var(--text-6xl);
  margin-bottom: var(--space-6);
  max-width: 800px;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--text-4xl);
  }
}

.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-bottom: var(--space-10);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  padding: var(--space-4) var(--space-10);
  border-radius: var(--radius-md);
  font-weight: 600;
  display: inline-block;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  box-shadow: var(--shadow-accent);
}

/* Stats Strip */
.stats-strip {
  background-color: var(--color-surface-raised);
  border-top: 1px solid var(--color-primary-700);
  padding: var(--space-12) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-10);
  }
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  color: var(--color-accent-light);
  display: block;
}

.stat-label {
  font-size: var(--text-sm);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  letter-spacing: 0.1em;
}

/* Sections General */
.section-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-12);
  text-align: center;
}

/* Keunggulan Lokasi */
.location-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 1024px) {
  .location-grid {
    grid-template-columns: 1fr;
  }
}

.location-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.location-point {
  display: flex;
  gap: var(--space-6);
}

.point-number {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-accent);
  opacity: 0.4;
  line-height: 1;
}

.point-content h3 {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.point-content p {
  color: var(--color-text-secondary);
}

.location-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease-standard), transform 0.8s var(--ease-standard);
  will-change: opacity, transform;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger reveals */
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }

/* Timeline */
.timeline-container {
  overflow-x: auto;
  padding: var(--space-8) 0;
  -webkit-overflow-scrolling: touch;
}

.timeline {
  display: flex;
  min-width: 800px;
  justify-content: space-between;
  position: relative;
  padding-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .timeline-container {
    overflow-x: hidden;
  }
  .timeline {
    flex-direction: column;
    min-width: 100%;
    padding-left: var(--space-8);
  }
  .timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 12px;
    width: 2px;
    height: 100%;
    background-color: var(--color-primary-700);
  }
  .timeline-item {
    width: 100% !important;
    text-align: left !important;
    margin-bottom: var(--space-10);
    padding-left: var(--space-6);
  }
  .timeline-dot {
    position: absolute;
    left: 0;
    margin: 0 !important;
  }
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

@media (max-width: 1024px) {
  .faq-grid {
    grid-template-columns: 1fr;
  }
}

.accordion-item {
  border-bottom: 1px solid var(--color-primary-700);
}

.accordion-header {
  padding: var(--space-6) 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
}

.accordion-header h3 {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-primary);
}

.accordion-icon {
  width: 24px;
  height: 24px;
  position: relative;
  transition: transform var(--dur-moderate) var(--ease-spring);
}

.accordion-icon::before,
.accordion-icon::after {
  content: '';
  position: absolute;
  background-color: var(--color-accent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.accordion-icon::before {
  width: 16px;
  height: 2px;
}

.accordion-icon::after {
  width: 2px;
  height: 16px;
  transition: transform var(--dur-moderate) var(--ease-spring);
}

.accordion-item[open] .accordion-icon {
  transform: rotate(45deg);
}

.accordion-content {
  padding-bottom: var(--space-6);
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  overflow: hidden;
  transition: max-height var(--dur-moderate) var(--ease-spring);
}

/* Form */
.registration-form {
  background-color: var(--color-surface-card);
  padding: var(--space-12);
  border-radius: var(--radius-lg);
  max-width: 800px;
  margin: 0 auto;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.form-control {
  width: 100%;
  background-color: transparent;
  border: 1px solid var(--color-primary-700);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  transition: border var(--dur-base) var(--ease-standard);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-tint);
}

.radio-group {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.btn-submit {
  width: 100%;
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  margin-top: var(--space-6);
}

/* Footer */
.footer {
  background-color: var(--color-primary-950);
  padding: var(--space-24) 0 var(--space-8);
  border-top: 1px solid var(--color-primary-700);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-16);
  margin-bottom: var(--space-20);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-logo {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
}

.footer-info p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
}

.footer-links h4 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-6);
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-2);
}

.footer-copyright {
  border-top: 1px solid var(--color-primary-700);
  padding-top: var(--space-8);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* =========================================
   FLOATING WHATSAPP BUTTON
   ========================================= */
@keyframes wa-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.55); }
  70%  { box-shadow: 0 0 0 14px rgba(37, 211, 102, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

.wa-float {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: #25D366;
  box-shadow: 0 6px 24px rgba(37, 211, 102, 0.45);
  text-decoration: none;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
              box-shadow 0.25s ease;
  animation: wa-pulse 2.4s ease-out infinite;
}

.wa-float:hover {
  transform: scale(1.12);
  box-shadow: 0 10px 32px rgba(37, 211, 102, 0.6);
  animation-play-state: paused;
}

.wa-float svg {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.wa-float:hover svg {
  transform: rotate(-10deg) scale(1.08);
}

/* Tooltip */
.wa-float__tooltip {
  position: absolute;
  right: calc(100% + 12px);
  background: rgba(15, 23, 42, 0.92);
  color: #fff;
  font-size: 0.78rem;
  font-family: var(--font-sans);
  font-weight: 500;
  white-space: nowrap;
  padding: 6px 12px;
  border-radius: 8px;
  pointer-events: none;
  opacity: 0;
  transform: translateX(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.wa-float__tooltip::after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: rgba(15, 23, 42, 0.92);
}

.wa-float:hover .wa-float__tooltip {
  opacity: 1;
  transform: translateX(0);
}