/* ============================
   evoFaceFlow Website Styles
   Black/White Minimal Design
   ============================ */

:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-100: #f8f8f8;
  --color-gray-200: #e8e8e8;
  --color-gray-300: #d0d0d0;
  --color-gray-400: #a0a0a0;
  --color-gray-500: #707070;
  --color-gray-600: #505050;
  --color-gray-700: #303030;
  --color-gray-800: #1a1a1a;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-gray-800);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-gray-800);
  border-color: var(--color-gray-800);
}

.btn-secondary {
  background: transparent;
  color: var(--color-black);
  border-color: var(--color-gray-300);
}

.btn-secondary:hover {
  border-color: var(--color-black);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-200);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-xl);
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
}

.logo-evo {
  color: var(--color-gray-500);
}

.logo-face {
  color: var(--color-black);
}

.nav-links {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-links a {
  font-weight: 500;
  color: var(--color-gray-600);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-black);
}

.nav-auth, .nav-user {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.user-greeting {
  font-weight: 500;
  color: var(--color-gray-600);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
}

/* Hero Section */
.hero {
  display: flex;
  align-items: center;
  min-height: 100vh;
  padding: calc(80px + var(--spacing-4xl)) var(--spacing-xl) var(--spacing-4xl);
  max-width: 1200px;
  margin: 0 auto;
  gap: var(--spacing-4xl);
}

.hero-content {
  flex: 1;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
}

.hero-highlight {
  background: linear-gradient(135deg, var(--color-gray-600) 0%, var(--color-black) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-gray-600);
  line-height: 1.7;
  margin-bottom: var(--spacing-2xl);
  max-width: 500px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

@media (max-width: 968px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: calc(80px + var(--spacing-2xl));
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
}

/* Section Styles */
.section-title {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  text-align: center;
  color: var(--color-gray-500);
  font-size: 1.1rem;
  margin-bottom: var(--spacing-3xl);
}

/* Features Section */
.features {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background: var(--color-gray-100);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--color-white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.feature-icon {
  margin-bottom: var(--spacing-lg);
}

.feature-card h3 {
  margin-bottom: var(--spacing-md);
}

.feature-card p {
  color: var(--color-gray-600);
  font-size: 0.95rem;
}

/* App Preview Section */
.app-preview {
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.app-preview .container {
  display: flex;
  align-items: center;
  gap: var(--spacing-4xl);
}

.preview-content {
  flex: 1;
}

.preview-content .section-title,
.preview-content .section-subtitle {
  text-align: left;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.step {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-black);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.step h4 {
  margin-bottom: var(--spacing-xs);
}

.step p {
  color: var(--color-gray-600);
}

.preview-phones {
  flex: 1;
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  position: relative;
}

.phone-mockup {
  width: 200px;
  height: 400px;
}

.phone-mockup-front {
  transform: translateY(40px);
}

@media (max-width: 968px) {
  .app-preview .container {
    flex-direction: column;
  }
  
  .preview-content .section-title,
  .preview-content .section-subtitle {
    text-align: center;
  }
}

/* Community Section */
.community {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background: var(--color-gray-100);
}

.community-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.community-img {
  aspect-ratio: 1;
  border-radius: var(--radius-md);
}

@media (max-width: 768px) {
  .community-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* About Section */
.about {
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.about .container {
  display: flex;
  align-items: center;
  gap: var(--spacing-4xl);
}

.about-content {
  flex: 1;
}

.about-content .section-title {
  text-align: left;
  margin-bottom: var(--spacing-xl);
}

.about-content p {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.about-image {
  flex: 1;
}

.about-placeholder {
  width: 100%;
  height: 400px;
}

@media (max-width: 968px) {
  .about .container {
    flex-direction: column;
  }
  
  .about-content .section-title {
    text-align: center;
  }
}

/* Download Section */
.download {
  padding: var(--spacing-4xl) var(--spacing-xl);
  background: var(--color-black);
  color: var(--color-white);
  text-align: center;
}

.download .section-title {
  color: var(--color-white);
}

.download .section-subtitle {
  color: var(--color-gray-400);
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  min-width: 190px;
  border-radius: 12px;
  background: var(--color-black);
  border: 1px solid rgba(255, 255, 255, 0.4);
  text-decoration: none;
  position: relative;
}

.store-badge .badge-logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.store-badge .badge-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  text-align: left;
  color: var(--color-white);
}

.store-badge .badge-text small {
  font-size: 0.62rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  opacity: 0.85;
}

.store-badge .badge-text strong {
  font-size: 1.1rem;
  font-weight: 600;
}

.download-note {
  color: var(--color-gray-500);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  padding: var(--spacing-3xl) var(--spacing-xl) var(--spacing-xl);
  background: var(--color-gray-100);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand p {
  color: var(--color-gray-500);
  margin-top: var(--spacing-md);
}

.footer-links h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-gray-500);
  margin-bottom: var(--spacing-md);
}

.footer-links a {
  display: block;
  color: var(--color-gray-600);
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-gray-200);
  text-align: center;
  color: var(--color-gray-500);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }
  
  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* Placeholder Styles (remove when adding real images) */
.placeholder-image {
  background: linear-gradient(135deg, var(--color-gray-200) 0%, var(--color-gray-300) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-500);
  font-weight: 500;
  border: 2px dashed var(--color-gray-300);
}

.placeholder-image span {
  font-size: 1rem;
}

.placeholder-image small {
  font-size: 0.75rem;
  color: var(--color-gray-400);
  margin-top: var(--spacing-xs);
}

.hero-placeholder {
  width: 100%;
  max-width: 450px;
  height: 500px;
}

.placeholder-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.store-badge-live {
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.store-badge-live:hover {
  border-color: var(--color-white);
  transform: translateY(-1px);
}

.store-badge-soon {
  opacity: 0.7;
  cursor: default;
}

.store-badge-soon .soon-pill {
  position: absolute;
  top: -10px;
  right: -8px;
  background: var(--color-white);
  color: var(--color-black);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 999px;
}

/* Auth Pages */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background: var(--color-gray-100);
}

.auth-card {
  background: var(--color-white);
  padding: var(--spacing-3xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 420px;
}

.auth-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.auth-header h1 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
}

.auth-header p {
  color: var(--color-gray-500);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--color-gray-700);
}

.form-group input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-black);
}

.form-group input::placeholder {
  color: var(--color-gray-400);
}

.auth-card .btn {
  width: 100%;
  margin-top: var(--spacing-md);
}

.auth-footer {
  text-align: center;
  margin-top: var(--spacing-xl);
  color: var(--color-gray-500);
}

.auth-footer a {
  color: var(--color-black);
  font-weight: 600;
}

.auth-error {
  background: #fee;
  color: #c00;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  font-size: 0.9rem;
  display: none;
}

.auth-error.visible {
  display: block;
}

.auth-success {
  background: #efe;
  color: #060;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  font-size: 0.9rem;
  display: none;
}

.auth-success.visible {
  display: block;
}