:root {
    --background-light: #f8f9fa;
    --foreground-light: #212529;
    --card-bg-light: #ffffff;
    --card-border-light: #dee2e6;
    --input-bg-light: #ffffff;
    --input-border-light: #ced4da;
    --primary-color: #0d6efd;
    --primary-hover: #0b5ed7;
    --secondary-outline-light: #6c757d;

    --background-dark: #121212;
    --foreground-dark: #e0e0e0;
    --card-bg-dark: #1e1e1e;
    --card-border-dark: #333333;
    --input-bg-dark: #2a2a2a;
    --input-border-dark: #444444;
    --secondary-outline-dark: #adb5bd;
    --primary-dark-theme: #589bff; /* Lighter blue for dark theme */
}

body {
    background-color: var(--background-light);
    color: var(--foreground-light);
    transition: background-color 0.3s, color 0.3s;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body.dark-mode {
    background-color: var(--background-dark);
    color: var(--foreground-dark);
}

.card, .login-card {
    background-color: var(--card-bg-light);
    border: 1px solid var(--card-border-light);
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: background-color 0.3s, border-color 0.3s;
}
.login-card {
    width: 380px;
}
body.dark-mode .card, body.dark-mode .login-card {
    background-color: var(--card-bg-dark);
    border-color: var(--card-border-dark);
}

.navbar {
    background-color: var(--card-bg-light);
    border-bottom: 1px solid var(--card-border-light);
    box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}
body.dark-mode .navbar {
    background-color: var(--card-bg-dark);
    border-bottom: 1px solid var(--card-border-dark);
}
.navbar .navbar-brand {
    color: var(--foreground-light) !important;
}
body.dark-mode .navbar .navbar-brand {
    color: var(--foreground-dark) !important;
}

.form-control {
    background-color: var(--input-bg-light);
    border: 1px solid var(--input-border-light);
    color: var(--foreground-light);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}
body.dark-mode .form-control {
    background-color: var(--input-bg-dark);
    border-color: var(--input-border-dark);
    color: var(--foreground-dark);
}
.form-control:focus {
    background-color: var(--input-bg-light);
    color: var(--foreground-light);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.25);
}
body.dark-mode .form-control:focus {
    background-color: var(--input-bg-dark);
    color: var(--foreground-dark);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: 0.5rem;
    padding: 0.75rem;
    font-weight: 600;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}
.btn-outline-secondary {
    color: var(--secondary-outline-light);
    border-color: var(--secondary-outline-light);
}
.btn-outline-secondary:hover {
    color: #fff;
    background-color: var(--secondary-outline-light);
    border-color: var(--secondary-outline-light);
}
body.dark-mode .btn-outline-secondary {
    color: var(--secondary-outline-dark);
    border-color: var(--secondary-outline-dark);
}
body.dark-mode .btn-outline-secondary:hover {
    color: #000;
    background-color: var(--secondary-outline-dark);
    border-color: var(--secondary-outline-dark);
}

small.text-muted {
    color: #6c757d !important;
}
body.dark-mode small.text-muted {
    color: #adb5bd !important;
}

.password-wrapper { position: relative; }
#togglePassword {
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    cursor: pointer;
    color: #6c757d;
}
body.dark-mode #togglePassword { color: #adb5bd; }

.theme-toggle-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1030;
}
#theme-toggle {
    border: 1px solid var(--card-border-light);
    background-color: var(--card-bg-light);
    color: var(--foreground-light);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
}
body.dark-mode #theme-toggle {
    border-color: var(--card-border-dark);
    background-color: var(--card-bg-dark);
    color: var(--foreground-dark);
}

#theme-toggle .fa-sun { display: none; }
#theme-toggle .fa-moon { display: block; }
body.dark-mode #theme-toggle .fa-sun { display: block; }
body.dark-mode #theme-toggle .fa-moon { display: none; }

.file-icon {
    font-size: 3.5rem;
    color: #6c757d;
}
body.dark-mode .file-icon {
    color: #adb5bd;
}
.file-thumbnail {
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.file-thumbnail img {
    max-height: 100%;
    max-width: 100%;
    object-fit: cover;
}


/* Dark Mode Text Fixes */
body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4,
body.dark-mode h5,
body.dark-mode h6 {
    color: var(--foreground-dark);
}

body.dark-mode .text-primary {
    color: var(--primary-dark-theme) !important;
}

body.dark-mode .alert-info {
    color: var(--foreground-dark);
    background-color: rgba(88, 155, 255, 0.1);
    border-color: var(--primary-dark-theme);
}

body.dark-mode .modal-content {
    background-color: var(--card-bg-dark);
    color: var(--foreground-dark);
}

body.dark-mode .modal-header {
    border-bottom-color: var(--card-border-dark);
}
body.dark-mode .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}