/* KeepFiles - Modern Cloud Storage Frontend */
/* Google Font: Inter */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* CSS Variables */
:root {
  --accent-color: #32D48E;
  --text-primary: #1A1A1A;
  --text-secondary: #555;
  --bg-white: #FFFFFF;
  --border-color: #E5E5E5;
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 {
  font-size: 48px;
  font-weight: 700;
}

h2 {
  font-size: 36px;
  font-weight: 600;
}

h3 {
  font-size: 24px;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  font-size: 16px;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* Header */
.header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
}

.logo img {
  width: 32px;
  height: 32px;
}

.nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav a {
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--accent-color);
  opacity: 1;
}

.nav a.active {
  color: var(--accent-color);
}

.btn-signin {
  background: var(--accent-color);
  color: white;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-signin:hover {
  background: #2BC47A;
  transform: translateY(-1px);
}

.btn-signin:active {
  transform: translateY(0);
}

/* Hero Section */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  margin-bottom: 20px;
  line-height: 1.1;
}

.hero-content p {
  font-size: 18px;
  margin-bottom: 32px;
  line-height: 1.6;
}

.btn-primary {
  background: var(--accent-color);
  color: white;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  display: inline-block;
}

.btn-primary:hover {
  background: #2BC47A;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

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

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

/* Responsive - Mobile First */
@media (max-width: 768px) {
  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

  .header-container {
    padding: 0 16px;
  }

  .nav {
    gap: 16px;
  }

  .nav a {
    font-size: 14px;
  }

  .btn-signin {
    padding: 8px 16px;
    font-size: 14px;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 60px 16px;
    gap: 40px;
    text-align: center;
  }

  .hero-content h1 {
    font-size: 32px;
  }

  .hero-content p {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 28px;
  }

  .nav {
    display: none;
  }

  .hero {
    padding: 40px 16px;
  }

  .hero-content h1 {
    font-size: 24px;
  }
}

/* Utility Classes */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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