/* ============================================
   Safe&Sound Robotics — A1AN Web
   Global Styles
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-primary: #1d3253;
  --color-secondary: #2a5c92;
  --color-accent: #53b2b8;
  --color-white: #ffffff;
  --color-bg: #f5f7fa;
  --color-text: #1f2937;
  --color-gray: #6b7280;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;

  --font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.25rem;

  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  --header-height: 72px;
  --max-width: 1200px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-primary);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
  margin-bottom: var(--spacing-4);
  color: var(--color-gray);
}

.section-title {
  font-size: var(--font-size-3xl);
  text-align: center;
  margin-bottom: var(--spacing-3);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray);
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--spacing-12);
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: 0.75rem 1.75rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #48a0a5;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: #235082;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border: 2px solid var(--color-white);
  color: var(--color-white);
  background: transparent;
}

.btn-outline:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
}

.btn-outline-dark {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline-dark:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: var(--font-size-base);
}

/* --- Cards --- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
}

.badge-success {
  background-color: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background-color: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background-color: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background-color: #dbeafe;
  color: #1e40af;
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transform: translateY(120%);
  opacity: 0;
  transition: all var(--transition-base);
  z-index: 9999;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-success {
  background: var(--color-success);
}

.toast-danger {
  background: var(--color-danger);
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.header-logo img {
  height: 40px;
  width: auto;
}

.header-logo span {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
}

.header-nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray);
  transition: color var(--transition-fast);
  position: relative;
}

.header-nav a:hover,
.header-nav a.active {
  color: var(--color-primary);
}

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--spacing-2);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 60%, #3a7bb8 100%);
  overflow: hidden;
  padding-top: var(--header-height);
}

/* Interactive white dot grid (canvas drawn by main.js) */
.hero-dots-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(83, 178, 184, 0.15) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(83, 178, 184, 0.1) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-16);
  position: relative;
  z-index: 2;
}

.hero-content {
  flex: 1;
  max-width: 580px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: 0.4rem 1rem;
  background: rgba(83, 178, 184, 0.2);
  border: 1px solid rgba(83, 178, 184, 0.3);
  border-radius: var(--radius-full);
  color: var(--color-accent);
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-6);
  letter-spacing: 0.03em;
}

.hero h1 {
  color: var(--color-white);
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-6);
  line-height: 1.15;
  letter-spacing: -0.01em;
  word-spacing: 0.05em;
}

.hero h1 .highlight {
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.hero-description {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-8);
  line-height: 1.8;
  letter-spacing: 0.01em;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.hero-visual {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-robot-container {
  position: relative;
  width: 400px;
  height: 400px;
}

.hero-robot-circle {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(83, 178, 184, 0.2);
}

.hero-robot-circle:nth-child(1) {
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  animation: pulse-ring 4s ease-in-out infinite;
}

.hero-robot-circle:nth-child(2) {
  width: 80%;
  height: 80%;
  top: 10%;
  left: 10%;
  border-color: rgba(83, 178, 184, 0.3);
  animation: pulse-ring 4s ease-in-out 1s infinite;
}

.hero-robot-circle:nth-child(3) {
  width: 60%;
  height: 60%;
  top: 20%;
  left: 20%;
  border-color: rgba(83, 178, 184, 0.4);
  animation: pulse-ring 4s ease-in-out 2s infinite;
}

/* A1AN title inside the inner ring */
.hero-brand-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  text-align: center;
  pointer-events: none;
  width: 55%;
  max-width: 220px;
}

.hero-a1an-title {
  display: block;
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--color-white);
  text-shadow:
    0 0 40px rgba(83, 178, 184, 0.45),
    0 2px 20px rgba(0, 0, 0, 0.25);
  line-height: 1.05;
  margin-bottom: 0.35rem;
}

.hero-a1an-tag {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.05); opacity: 1; }
}

.hero-stats {
  display: flex;
  gap: var(--spacing-8);
  margin-top: var(--spacing-10);
  padding-top: var(--spacing-8);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

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

.hero-stat-value {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-white);
}

.hero-stat-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   SECTIONS (general)
   ============================================ */
.section {
  padding: var(--spacing-16) 0;
}

.section-alt {
  background-color: var(--color-bg);
}

/* --- Scroll fade-in animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   ABOUT
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-16);
  align-items: center;
}

.about-content {
  padding-left: var(--spacing-8);
  border-left: 4px solid var(--color-accent);
}

.about-content h2 {
  margin-bottom: var(--spacing-4);
}

.about-content p {
  margin-bottom: var(--spacing-4);
  line-height: 1.8;
}

.about-visual {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.about-card {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-4);
  padding: var(--spacing-6);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.about-card:hover {
  box-shadow: var(--shadow-md);
}

.about-card-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent), var(--color-secondary));
  border-radius: var(--radius-md);
  color: var(--color-white);
}

.about-card-icon svg {
  width: 24px;
  height: 24px;
}

.about-card h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-1);
}

.about-card p {
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ============================================
   FEATURES
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-8);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-8) var(--spacing-6);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-6);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(83, 178, 184, 0.1), rgba(42, 92, 146, 0.1));
  border-radius: var(--radius-lg);
  color: var(--color-accent);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-3);
}

.feature-card p {
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

/* ============================================
   HOW IT WORKS
   ============================================ */
.steps-container {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}

.steps-container::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-secondary));
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-6);
  padding: var(--spacing-6) 0;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-xl);
  font-weight: 700;
  border-radius: 50%;
  z-index: 1;
  box-shadow: 0 0 0 6px var(--color-bg);
}

.step-content h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2);
}

.step-content p {
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ============================================
   BENEFITS
   ============================================ */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-6);
}

.benefit-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-4);
  padding: var(--spacing-6);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.benefit-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.benefit-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(83, 178, 184, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.benefit-icon svg {
  width: 22px;
  height: 22px;
}

.benefit-text h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-1);
}

.benefit-text p {
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ============================================
   CONTACT
   ============================================ */
.contact-wrapper {
  max-width: 640px;
  margin: 0 auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background: var(--color-white);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(83, 178, 184, 0.15);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  display: none;
}

.form-error.show {
  display: block;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--spacing-16) 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-12);
  padding-bottom: var(--spacing-12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand img {
  height: 48px;
  margin-bottom: var(--spacing-4);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
  max-width: 300px;
  line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-4);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-contact p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--spacing-2);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.footer-bottom {
  padding: var(--spacing-6) 0;
  text-align: center;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.4);
}