/* CSS Variables for Theming */
:root {
    --background-color: #f0f2f5;        /* Light grayish-blue background */
    --text-color: #333;                 /* Default text color */
    --heading-color: #1f2937;           /* Darker gray for headings */
    --muted-text-color: #6b7280;        /* For less important text */
    --link-color: #3b82f6;              /* Blue for links */
    --link-hover-color: #2563eb;        /* Darker blue for link hover */
    --border-color: #d1d5db;            /* Default border color (gray-300) */
    --input-border-color: #d1d5db;
    --input-focus-border-color: #3b82f6;
    --input-focus-shadow-color: rgba(59, 130, 246, 0.25);
    --input-background-color: #ffffff;
    --card-background-color: #ffffff;       /* Background for main app container, cards */
    --card-alt-background-color: #f9fafb; /* Slightly off-white for some card-like elements (e.g., question container) */
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-hover-color: rgba(0, 0, 0, 0.15);
    --primary-button-bg: #3b82f6;
    --primary-button-hover-bg: #2563eb;
    --secondary-button-bg: #6b7280;
    --secondary-button-hover-bg: #4b5563;
    --danger-button-bg: #ef4444;
    --danger-button-hover-bg: #dc2626;
    --warning-button-bg: #f59e0b;
    --warning-button-hover-bg: #d97706;
    --navbar-bg: #374151; /* Darker gray for navbar in light mode */
    --navbar-text-color: #ffffff;
    --timer-text-color: #c0392b;
    --timer-background-color: #fceded;
    --timer-border-color: #f5c6cb;
    --progress-bar-bg: #e5e7eb;
    --progress-bar-fill: #3b82f6;
    --question-nav-panel-bg: #f3f4f6;
    --question-nav-item-bg: #ffffff;
    --question-nav-item-border: #d1d5db;
    --question-nav-item-hover-bg: #eff6ff;
    --question-nav-item-hover-border: #93c5fd;
    --question-nav-item-current-bg: #3b82f6;
    --question-nav-item-current-text: #ffffff;
    --question-nav-item-answered-bg: #d1fae5;
    --question-nav-item-answered-border: #6ee7b7;
    --icon-color: #4b5563; /* For sun/moon icons */
    --icon-hover-color: #1f2937;
}

html.dark-mode {
    --background-color: #111827;        /* Very dark blue/gray */
    --text-color: #d1d5db;              /* Light gray text (gray-300) */
    --heading-color: #f3f4f6;           /* Lighter gray for headings (gray-100) */
    --muted-text-color: #9ca3af;        /* Medium gray for muted text (gray-400) */
    --link-color: #60a5fa;              /* Lighter blue for links */
    --link-hover-color: #93c5fd;        /* Even lighter blue for link hover */
    --border-color: #4b5563;            /* Darker border color (gray-600) */
    --input-border-color: #4b5563;
    --input-focus-border-color: #60a5fa;
    --input-focus-shadow-color: rgba(96, 165, 250, 0.3);
    --input-background-color: #374151;  /* Dark gray for input backgrounds (gray-700) */
    --card-background-color: #1f2937;       /* Darker card background (gray-800) */
    --card-alt-background-color: #374151; /* (gray-700) */
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-hover-color: rgba(0, 0, 0, 0.4);
    --primary-button-bg: #2563eb;       /* Slightly adjusted if needed */
    --primary-button-hover-bg: #1d4ed8;
    --secondary-button-bg: #4b5563;
    --secondary-button-hover-bg: #374151;
    /* Danger and Warning buttons can often keep similar colors or be slightly desaturated */
    --navbar-bg: #1f2937;               /* Even darker for navbar in dark mode */
    --navbar-text-color: #e5e7eb;
    --timer-text-color: #f87171;        /* Lighter red for timer text */
    --timer-background-color: #452323;  /* Dark red background */
    --timer-border-color: #7f1d1d;      /* Darker red border */
    --progress-bar-bg: #374151;
    --progress-bar-fill: #60a5fa;
    --question-nav-panel-bg: #1f2937;
    --question-nav-item-bg: #374151;
    --question-nav-item-border: #4b5563;
    --question-nav-item-hover-bg: #4b5563;
    --question-nav-item-hover-border: #60a5fa;
    --question-nav-item-current-bg: #60a5fa;
    --question-nav-item-current-text: #111827;
    --question-nav-item-answered-bg: #065f46; /* Darker green */
    --question-nav-item-answered-border: #047857;
    --icon-color: #9ca3af;
    --icon-hover-color: #e5e7eb;
}

/* Apply base styles using variables */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding-top: 2rem;
    padding-bottom: 2rem;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease; /* Smooth transition */
}

.app-container {
    background-color: var(--card-background-color);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 10px 25px -5px var(--shadow-color), 0 10px 10px -5px var(--shadow-color);
    width: 100%;
    max-width: 900px;
    transition: background-color 0.3s ease;
}

.page { display: none; }
.page.active { display: block; }

.form-input {
    border: 1px solid var(--input-border-color);
    background-color: var(--input-background-color);
    color: var(--text-color);
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    width: 100%;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.3s ease, color 0.3s ease;
    margin-bottom: 1rem;
}
.form-input::placeholder { /* Styling placeholder text */
    color: var(--muted-text-color);
}
.form-input:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 3px var(--input-focus-shadow-color);
}

.btn {
    padding: 0.75rem 1.5rem; border-radius: 0.375rem; font-weight: 500; cursor: pointer;
    transition: background-color 0.2s ease-in-out; text-align: center; border: none;
}
.btn-sm { padding: 0.5rem 1rem; font-size: 0.875rem; }

.btn-primary { background-color: var(--primary-button-bg); color: white; }
.btn-primary:hover { background-color: var(--primary-button-hover-bg); }
.btn-secondary { background-color: var(--secondary-button-bg); color: white; }
.btn-secondary:hover { background-color: var(--secondary-button-hover-bg); }
.btn-danger { background-color: var(--danger-button-bg); color: white; }
.btn-danger:hover { background-color: var(--danger-button-hover-bg); }
.btn-warning { background-color: var(--warning-button-bg); color: white; }
.btn-warning:hover { background-color: var(--warning-button-hover-bg); }

.link { color: var(--link-color); cursor: pointer; text-decoration: underline; }
.link:hover { color: var(--link-hover-color); }

.error-message { color: #ef4444; font-size: 0.875rem; margin-top: 0.5rem; }
.success-message { color: #10b981; font-size: 0.875rem; margin-top: 0.5rem; }

#navbar {
    background-color: var(--navbar-bg);
    padding: 1rem 1.5rem; border-radius: 0.5rem; margin-bottom: 1.5rem;
    display: flex; justify-content: space-between; align-items: center;
    transition: background-color 0.3s ease;
}
.nav-text-color { /* Class for text in navbar that needs to change color */
    color: var(--navbar-text-color);
    transition: color 0.3s ease;
}

/* Specific Text Colors using variables */
.text-color { color: var(--text-color); }
.heading-color { color: var(--heading-color); }
.text-muted-color { color: var(--muted-text-color); }


.question-container {
    border: 1px solid var(--border-color); padding: 1.5rem; border-radius: 0.5rem;
    margin-bottom: 1.5rem; background-color: var(--card-alt-background-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.option-label {
    display: block; padding: 0.75rem; border: 1px solid var(--border-color);
    border-radius: 0.375rem; margin-bottom: 0.5rem; cursor: pointer;
    background-color: var(--card-background-color); /* Options can have card background */
    transition: background-color 0.2s, border-color 0.2s;
}
.option-label:hover { background-color: var(--question-nav-item-hover-bg); border-color: var(--question-nav-item-hover-border); }
.option-label input[type="radio"] { margin-right: 0.75rem; }

.timer {
    font-size: 1.5rem; font-weight: 600; color: var(--timer-text-color); padding: 0.5rem 1rem;
    background-color: var(--timer-background-color); border: 1px solid var(--timer-border-color);
    border-radius: 0.375rem; text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.progress-bar-container { width: 100%; background-color: var(--progress-bar-bg); border-radius: 0.25rem; margin-bottom: 1rem; height: 10px; }
.progress-bar { height: 10px; background-color: var(--progress-bar-fill); border-radius: 0.25rem; width: 0%; transition: width 0.3s ease-in-out, background-color 0.3s ease; }

#questionNavPanel {
    margin-top: 1.5rem; margin-bottom: 1.5rem; padding: 1rem; background-color: var(--question-nav-panel-bg);
    border-radius: 0.5rem; border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
#questionNavPanel h3 {
    font-size: 1.125rem; font-weight: 600; margin-bottom: 0.75rem; color: var(--heading-color);
}
.question-nav-list {
    display: flex; flex-wrap: wrap; gap: 0.5rem; max-height: 150px; overflow-y: auto;
}
.question-nav-item {
    padding: 0.375rem 0.75rem; border: 1px solid var(--question-nav-item-border);
    border-radius: 0.375rem; cursor: pointer; font-size: 0.875rem;
    background-color: var(--question-nav-item-bg); color: var(--text-color);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}
.question-nav-item:hover { background-color: var(--question-nav-item-hover-bg); border-color: var(--question-nav-item-hover-border); }
.question-nav-item.current {
    background-color: var(--question-nav-item-current-bg); color: var(--question-nav-item-current-text);
    border-color: var(--question-nav-item-current-bg); font-weight: 600;
}
.question-nav-item.answered { background-color: var(--question-nav-item-answered-bg); border-color: var(--question-nav-item-answered-border); }
.question-nav-item.answered.current { background-color: var(--primary-button-hover-bg); /* Or a distinct color */ }


/* My Results Page Specific Styles */
#myResultsListContainer ul { list-style-type: none; padding: 0; }
#myResultsListContainer li { margin-bottom: 0.75rem; background-color: var(--card-background-color); }
#myResultsListContainer li:hover { background-color: var(--card-alt-background-color); }

#myResultsDetailedViewContainer.card-alt-bg { /* Ensure this uses the variable if it was a specific class */
    background-color: var(--card-alt-background-color);
    transition: background-color 0.3s ease;
}
.card-alt-bg { /* General class for elements that need this alternate card background */
    background-color: var(--card-alt-background-color);
    transition: background-color 0.3s ease;
}


/* Dark Mode Toggle Button Icon Styling */
.btn-icon { /* Style for the toggle button itself */
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--icon-color);
    padding: 0.5rem; /* Adjust padding for icon size */
    line-height: 1; /* Ensure icon is centered vertically */
}
.btn-icon:hover {
    background-color: var(--card-alt-background-color);
    color: var(--icon-hover-color);
}
.theme-icon-sun, .theme-icon-moon {
    font-size: 1.25rem; /* Adjust icon size */
}
/* Hide one icon by default, JS will toggle */
html:not(.dark-mode) .theme-icon-sun {
    display: none;
}
html.dark-mode .theme-icon-moon {
    display: none;
}
/* ----------------------------------
/* Base styles remain unchanged */

/* Responsive Styles */
@media (max-width: 768px) { /* Tablet and smaller devices */
    body {
        padding-top: 1rem; /* Reduce padding for smaller screens */
        padding-bottom: 1rem;
    }

    .app-container {
        padding: 1rem; /* Reduce padding for smaller screens */
        width: 100%; /* Full width on smaller screens */
        box-shadow: none; /* Optional: remove shadow for mobile */
    }

    .form-input {
        padding: 0.5rem; /* Adjust padding for inputs */
    }

    .btn {
        padding: 0.5rem 1rem; /* Adjust button padding */
        font-size: 0.875rem; /* Smaller font size for buttons */
    }

    .question-container {
        padding: 1rem; /* Adjust padding for question container */
    }

    .progress-bar-container {
        height: 8px; /* Adjust height for progress bar */
    }

    .progress-bar {
        height: 8px; /* Adjust height for progress bar */
    }

    #navbar {
        flex-direction: column; /* Stack navbar items vertically */
        align-items: flex-start; /* Align items to the start */
    }

    .question-nav-list {
        flex-direction: column; /* Stack question nav items vertically */
        max-height: none; /* Remove max-height for mobile */
    }

    .question-nav-item {
        width: 100%; /* Full width for nav items */
    }

    /* Adjust icon sizes */
    .btn-icon {
        padding: 0.25rem; /* Smaller padding for icons */
    }
}

/* Additional styles for smaller devices */
@media (max-width: 480px) { /* Mobile devices */
    body {
        font-size: 14px; /* Smaller base font size */
    }

    .app-container {
        padding: 0.5rem; /* Further reduce padding */
    }

    .form-input {
        font-size: 14px; /* Smaller font size for inputs */
    }

    .btn {
        font-size: 14px; /* Smaller font size for buttons */
    }

    .timer {
        font-size: 1.25rem; /* Adjust timer font size */
    }

    .question-container {
        margin-bottom: 1rem; /* Reduce margin for questions */
    }

    .error-message, .success-message {
        font-size: 0.75rem; /* Smaller font size for messages */
    }
}

/* GLOBAL FIXES */
*, *::before, *::after {
    box-sizing: border-box;
}
html, body {
    max-width: 100%;
    overflow-x: hidden;
}

/* NAVBAR FIXES FOR SMALL SCREENS */
#navbar {
    flex-wrap: wrap;
    gap: 0.5rem;
}
@media (max-width: 480px) {
    #navbar {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .nav-top {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .nav-brand {
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
    }

    .nav-actions {
        display: flex;
        gap: 0.5rem;
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .nav-actions .btn,
    .nav-actions .btn-icon {
        flex: 1 0 auto;
        padding: 0.5rem;
        font-size: 0.75rem;
    }

    .test-title-row {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .test-title-row h2 {
        font-size: 1rem;
        flex: 1;
    }

    .timer {
        padding: 0.25rem 0.75rem;
        font-size: 1rem;
        white-space: nowrap;
    }
}



/* CARD GRID FOR TEST SERIES PAGE */
.test-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 768px) {
    .test-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.test-card {
    width: 100%;
    margin-bottom: 1rem;
}
/* FIX QUESTION PALETTE FOR MOBILE */
@media (max-width: 480px) {
    #questionNavPanel {
        max-height: 200px;
        overflow-y: auto;
        padding: 0.5rem;
    }

    .question-nav-list {
        flex-wrap: wrap;
        flex-direction: row;
        gap: 0.4rem;
        justify-content: flex-start;
    }

    .question-nav-item {
        width: 36px;
        height: 36px;
        font-size: 0.75rem;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}