:root {
  --primary-color: #2196f3;
  --secondary-color: #1976d2;
  --accent-color: #64ffda;
  --text-primary: #2c3e50;
  --text-secondary: #64748b;
  --bg-primary: #ffffff;
  --bg-secondary: #f7f9fc;
  --error-color: #ef5350;
  --error-bg: #ffebee;
  --success-color: #4caf50;
  --success-bg: #e8f5e9;
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: #0f172a; /* Đảm bảo nền tối */
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  overflow-x: hidden;
  background-color: #0f172a !important; /* Đảm bảo không bị ghi đè */
}

html, body {
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  font-size: 16px;
  position: relative;
}

.app-content {
  width: 100%;
  min-height: 100vh; /* Đảm bảo nội dung đầy đủ chiều cao */
  overflow: visible;
  position: relative;
  -webkit-overflow-scrolling: touch;
  padding: 0;
  background: transparent; /* Đảm bảo không có nền đen */
}

/* Ẩn menu và các phần tử liên quan trên mobile */
.nav-container,
.nav-wrapper,
.main-nav,
.navbar,
.navigation {
  display: none !important;
  background: none !important;
  box-shadow: none !important;
  -webkit-backdrop-filter: none !important;
  backdrop-filter: none !important;
  height: 0 !important;
  min-height: 0 !important;
  padding: 0 !important;
  margin: 0 !important;
  border: none !important;
}

/* Ngăn chặn khung trắng khi loading */
.prediction-loading-overlay {
  background: #0f172a !important;
  background-color: #0f172a !important;
}

.prediction-loading-overlay::before,
.prediction-loading-overlay::after {
  display: none !important;
}

/* Đảm bảo không có pseudo-elements gây ra khung đen */
body::before,
.nav-container::before,
.main-nav::before,
.main-nav::after {
  display: none !important;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
}

.card {
  background: var(--bg-primary);
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Mobile-specific adjustments */
@media (max-width: 768px) {
  html, body {
    font-size: 14px;
    background: var(--bg-secondary) !important; /* Đảm bảo nền sáng trên mobile */
  }

  ::-webkit-scrollbar {
    width: 0;
    background: transparent;
  }

  .scrollable-page {
    padding-bottom: 30px;
  }

  .disclaimer-header, .login-header {
    padding: 2rem 1rem !important;
  }

  .disclaimer-card, .login-card {
    padding: 20px 15px !important;
    margin: 15px !important;
  }

  .disclaimer-section {
    flex-direction: column;
    text-align: center;
  }

  .section-icon {
    margin: 0 auto 15px !important;
  }

  .disclaimer-actions, .login-footer {
    flex-direction: column;
    align-items: center;
    padding: 15px 10px;
  }

  .btn, button[type="submit"] {
    width: 100%;
    max-width: 280px;
    margin-bottom: 10px;
  }

  input, button, select, textarea {
    -webkit-appearance: none;
    border-radius: 8px;
  }

  /* Đảm bảo không có khoảng trống do menu ẩn */
  .app-content {
    margin-top: 0 !important; /* Loại bỏ khoảng trống trên cùng */
    padding-top: 0 !important;
  }
}

/* Fix mobile content spacing */
.contact-page,
.dashboard-page,
.auth-page,
.disclaimer-page,
.who-we-are-page {
  padding-top: 0;
  margin-top: 0;
}

/* PWA Display Mode Detection */
@media (display-mode: standalone) {
    html {
        background: #020916 !important;
        background-color: #020916 !important;
    }

    body {
        background: linear-gradient(135deg, #020916 0%, #0a192f 100%);
        background-color: #020916 !important;
        user-select: none;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        
        /* Fix overscroll background color */
        -webkit-overscroll-behavior: none;
        overscroll-behavior: none;
    }

    /* Hide browser-specific elements in standalone mode */
    .browser-only {
        display: none !important;
    }

    /* PWA-specific adjustments */
    .app-content {
        min-height: 100vh;
        min-height: 100dvh; /* Dynamic viewport height */
        background: linear-gradient(135deg, #020916 0%, #0a192f 100%);
    }

    /* Fix for mobile overscroll bounce effect */
    * {
        -webkit-overscroll-behavior: none;
        overscroll-behavior: none;
    }
}

/* Enhanced Safe Area Support for Mobile Devices */
@supports (padding: max(0px)) {
    :root {
        --safe-area-inset-top: env(safe-area-inset-top, 0px);
        --safe-area-inset-right: env(safe-area-inset-right, 0px);
        --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
        --safe-area-inset-left: env(safe-area-inset-left, 0px);
    }

    body {
        padding-top: var(--safe-area-inset-top);
        padding-bottom: var(--safe-area-inset-bottom);
        padding-left: var(--safe-area-inset-left);
        padding-right: var(--safe-area-inset-right);
        background: linear-gradient(135deg, #020916 0%, #0a192f 100%);
        min-height: calc(100vh - var(--safe-area-inset-top) - var(--safe-area-inset-bottom));
    }

    .safe-area-top {
        height: var(--safe-area-inset-top);
        background: linear-gradient(135deg, #020916 0%, #0a192f 100%);
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 9999;
        backdrop-filter: blur(10px);
    }

    /* Mobile-specific layout adjustments */
    @media (max-width: 768px) and (display-mode: standalone) {
        html, body {
            background: #020916 !important;
            background-color: #020916 !important;
            -webkit-overscroll-behavior-y: none;
            overscroll-behavior-y: none;
        }

        .language-switch {
            top: calc(15px + var(--safe-area-inset-top));
            background: rgba(2, 9, 22, 0.8);
            backdrop-filter: blur(10px);
        }

        .main-content {
            padding-top: calc(24px + var(--safe-area-inset-top));
            background: linear-gradient(135deg, #020916 0%, #0a192f 100%);
        }

        .app-content {
            padding-bottom: calc(20px + var(--safe-area-inset-bottom));
        }
    }
}

/* PWA Installation Button Styles */
.pwa-install-banner {
    position: fixed;
    bottom: calc(20px + var(--safe-area-inset-bottom, 0px));
    left: 20px;
    right: 20px;
    background: linear-gradient(135deg, #020916 0%, #0a192f 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    z-index: 1000;
    animation: slideUp 0.3s ease-out;
}

.install-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #00B7FF 0%, #2196f3 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.install-text {
    flex: 1;
    color: white;
}

.install-text h4 {
    margin: 0 0 4px 0;
    font-size: 14px;
    font-weight: 600;
}

.install-text p {
    margin: 0;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
}

.install-buttons {
    display: flex;
    gap: 8px;
}

.btn-install {
    background: linear-gradient(135deg, #00B7FF 0%, #2196f3 100%);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-install:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 183, 255, 0.3);
}

.btn-dismiss {
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-dismiss:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}