/* CSS Variables for the Light/Blue Theme */
:root {
    --color-bg-dark: #f8fafc;       /* Off-White/Very Light Background */
    --color-card-dark: #ffffff;     /* Pure White Card Background */
    --color-text: black;            /* Normal Text */
    --color-text-light: #1f2937;    /* Dark Text (Primary) */
    --color-text-muted: #6b7280;    /* Medium Gray Text (Secondary) */
    --color-input-bg: #f9fafb;      /*ff0000 Very Light Input Field Background */
    --color-input-border: #d1d5db;  /* Light Input Field Border */
    --color-accent-base: #3b82f6;   /* Mid-Blue (Primary Accent) */
    --color-accent-hover: #2563eb;  /* Darker Blue (Hover/Active) */
    --color-error: #dc2626;         /* Red for errors */
    --color-success: #16a34a;       /* Green for success */
    --font-family: 'Inter', sans-serif;
    --border-radius: 12px;
    --color-focus-ring: rgba(59, 130, 246, 0.5)
}

/* CSS Variables for the Dark/Green Theme */
:root {
    --color-bg-dark: #0f172a;       /* Deep Charcoal Background */
    --color-card-dark: #1f2937;     /* Darker Card Background */
    --color-text: white;            /* Normal Text */
    --color-text-light: #d1d5db;    /* Light Gray Text */
    --color-text-muted: #9ca3af;    /* Muted Gray Text */
    --color-input-bg: #374151;      /* Input Field Background */
    --color-input-border: #4b5563;  /* Input Field Border */
    --color-accent-base: #10b981;   /* Emerald Green (Base) */
    --color-accent-hover: #059669;  /* Emerald Green (Darker for hover) */
    --color-error: #ef4444;         /* Red for errors */
    --color-success: #34d399;       /* Green for success */
    --font-family: 'Inter', sans-serif;
    --border-radius: 12px;
    --color-focus-ring: rgba(16, 185, 129, 0.5);
}

/* --- Global Styles --- */
body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--color-bg-dark), #020617);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    padding: 20px;
}

/* --- Utility Classes --- */
.text-center {
    text-align: center;
}

/* --- Login Card Container --- */
.login-card {
    width: 100%;
    /* Adjusted max-width slightly to reduce overall width for a tighter look */
    max-width: 320px; 
    padding: 32px;
    background-color: var(--color-card-dark);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

.login-card:hover {
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.6);
}

/* --- Header --- */
.header h1 {
    font-size: 1.875rem; /* 3xl */
    font-weight: 800; /* Extrabold */
    color: var(--color-text);
    margin-bottom: 8px;
}

.header p {
    font-size: 0.875rem; /* sm */
    color: var(--color-text-muted);
}

/* --- Form Elements --- */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.text-input {
    width: 90%; 
    display: block;
    margin: 0 auto; 
    padding: 10px 16px;

    border: 1px solid var(--color-input-border);
    border-radius: 8px;
    background-color: var(--color-input-bg);
    color: var(--color-text-light);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    text-align: left;
    /* Ensured inputs use the global font stack */
    font-family: var(--font-family); 
    /* FIXED: Set font size to match labels (0.875rem) */
    font-size: 0.875rem; 
}

.text-input::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
}

.text-input:focus {
    outline: none;
    border-color: var(--color-accent-base);
    box-shadow: 0 0 0 3px var(--color-focus-ring); /* Focus ring effect */
}

/* --- Checkbox and Forgot Link --- */
.action-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.remember-me-container {
    display: flex;
    align-items: center;
}

.remember-me-container input[type="checkbox"] {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    /* Light background for the checkbox */
    background-color: var(--color-text-light); 
    border: 1px solid var(--color-input-border);
    cursor: pointer;
    appearance: none; /* Hide default checkbox */
    transition: background-color 0.2s, border-color 0.2s;
    position: relative;
}

/* Checkmark styling using ::after pseudo-element */
.remember-me-container input[type="checkbox"]:checked::after {
    content: '\2713'; /* Unicode for check mark */
    position: absolute;
    top: -2px; 
    left: 2px;
    font-size: 14px;
    color: var(--color-accent-hover); /* Darker green checkmark */
    font-weight: bold;
}

.remember-me-container label {
    margin-left: 8px;
    color: var(--color-text-light);
    font-weight: 400;
}

.forgot-link {
    color: var(--color-accent-base);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s ease-in-out;
}

.forgot-link:hover {
    color: var(--color-accent-hover);
}

/* --- Login Button --- */
.login-button {
    width: 100%;
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    background-color: var(--color-accent-base);
    color: white;
    font-size: 1.125rem; /* lg */
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.15s ease-in-out, transform 0.1s ease;
}

.login-button:hover {
    background-color: var(--color-accent-hover);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.2);
}

.login-button:active {
    transform: scale(0.98);
}

/* --- Message Box --- */
#messageBox {
    text-align: center;
    padding: 12px;
    border-radius: 8px;
    font-weight: 500;
    margin-top: 16px;
}

.message-error {
    background-color: rgba(239, 68, 68, 0.2); /* Red 500 with alpha */
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.message-success {
    background-color: rgba(16, 185, 129, 0.2); /* Emerald 500 with alpha */
    color: var(--color-success);
    border: 1px solid var(--color-success);
}