/* Root variables for light and dark themes */
:root {
    --bg-color: #f8f9fa; /* Light background color similar to your landing page */
    --text-primary: #212529;
    --text-secondary: #495057;
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(0, 0, 0, 0.1);
    --input-bg: rgba(233, 236, 239, 0.7);
    --input-text: #212529;
    --accent: #007bff; /* A standard blue accent color */
    --accent-dark: #0056b3;
    --error: #dc3545;
    --switch-bg: #343a40;
    --switch-icon: #f8f9fa;
}

html.dark {
    --bg-color: #212529;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --card-bg: rgba(52, 58, 64, 0.75);
    --card-border: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(73, 80, 87, 0.7);
    --input-text: #f8f9fa;
    --accent: #0d6efd;
    --accent-dark: #3d8bfd;
    --switch-bg: #f8f9fa;
    --switch-icon: #343a40;
}

/* General body styling */
body {
    font-family: 'Hind Siliguri', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

/* Glassmorphism card effect */
.glass-card {
    background-color: var(--card-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--card-border);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
}

/* Floating label styles */
.floating-label-group {
    position: relative;
}

.floating-label {
    position: absolute;
    top: 50%;
    left: 1rem;
    transform: translateY(-50%);
    color: var(--text-secondary);
    transition: all 0.2s ease-out;
    pointer-events: none;
    background-color: transparent;
}

.floating-input:focus + .floating-label,
.floating-input:not(:placeholder-shown) + .floating-label {
    top: 0;
    left: 0.75rem;
    transform: translateY(-50%) scale(0.8);
    background-color: var(--card-bg);
    padding: 0 0.25rem;
    color: var(--accent);
    font-weight: 600;
}

/* Tab slider for login/signup */
.tab-slider {
    position: absolute;
    bottom: -2px;
    height: 3px;
    background-color: var(--accent);
    border-radius: 1.5px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* Password strength indicator */
.password-strength-bar {
    height: 5px;
    width: 0%;
    background-color: var(--error);
    border-radius: 2.5px;
    transition: all 0.3s ease;
}
.password-strength-bar.weak { width: 33%; background-color: #dc3545; }
.password-strength-bar.medium { width: 66%; background-color: #ffc107; }
.password-strength-bar.strong { width: 100%; background-color: #198754; }

/* Loading spinner animation */
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    width: 1.5rem;
    height: 1.5rem;
    animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Quote fade animation */
.quote-container {
    transition: opacity 0.5s ease-in-out;
}
.quote-container.fade-out {
    opacity: 0;
}