/* ==================== CSS Variables ==================== */
:root {
    /* Primary Colors - Teal/Cyan (DataGuard NXT theme) */
    --primary-hue: 180;
    --primary-sat: 70%;
    --primary-light: 50%;

    --primary-50: hsl(var(--primary-hue), var(--primary-sat), 95%);
    --primary-100: hsl(var(--primary-hue), var(--primary-sat), 90%);
    --primary-200: hsl(var(--primary-hue), var(--primary-sat), 80%);
    --primary-300: hsl(var(--primary-hue), var(--primary-sat), 70%);
    --primary-400: hsl(var(--primary-hue), var(--primary-sat), 60%);
    --primary-500: hsl(var(--primary-hue), var(--primary-sat), var(--primary-light));
    --primary-600: hsl(var(--primary-hue), var(--primary-sat), 45%);
    --primary-700: hsl(var(--primary-hue), var(--primary-sat), 40%);
    --primary-800: hsl(var(--primary-hue), var(--primary-sat), 30%);
    --primary-900: hsl(var(--primary-hue), var(--primary-sat), 20%);

    /* Accent Colors - Orange/Yellow (DataGuard NXT CTA) */
    --accent-hue: 35;
    --accent-500: hsl(var(--accent-hue), 90%, 55%);
    --accent-600: hsl(var(--accent-hue), 90%, 50%);

    /* Success Color */
    --success-500: hsl(145, 70%, 55%);
    --success-600: hsl(145, 70%, 45%);

    /* Neutral Colors - Navy Blue theme */
    --neutral-50: hsl(218, 20%, 98%);
    --neutral-100: hsl(218, 18%, 95%);
    --neutral-200: hsl(218, 15%, 90%);
    --neutral-300: hsl(218, 12%, 80%);
    --neutral-400: hsl(218, 10%, 60%);
    --neutral-500: hsl(218, 8%, 45%);
    --neutral-600: hsl(218, 10%, 35%);
    --neutral-700: hsl(218, 15%, 25%);
    --neutral-800: hsl(218, 25%, 15%);
    --neutral-900: hsl(218, 30%, 10%);

    /* Semantic Colors - Dark Navy Blue backgrounds */
    --background: hsl(218, 41%, 12%);
    --surface: hsl(218, 35%, 18%);
    --surface-elevated: hsl(218, 30%, 22%);
    --text-primary: hsl(0, 0%, 98%);
    --text-secondary: hsl(218, 10%, 70%);
    --text-tertiary: hsl(218, 10%, 55%);
    --border: hsl(218, 25%, 25%);
    --border-light: hsl(218, 20%, 30%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== Reset & Base Styles ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ==================== Background Gradient ==================== */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 30%, hsla(180, 70%, 50%, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, hsla(35, 90%, 55%, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, hsla(218, 60%, 40%, 0.08) 0%, transparent 60%);
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

/* ==================== Container ==================== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* ==================== Header ==================== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInDown 0.8s ease;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-glow);
    animation: float 3s ease-in-out infinite;
}

.logo-icon svg {
    width: 28px;
    height: 28px;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.logo-text {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-400), var(--accent-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ==================== Quiz Card ==================== */
.quiz-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.8s ease;
    position: relative;
    overflow: hidden;
}

.quiz-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-500));
}

/* ==================== Progress Bar ==================== */
.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-500));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    width: 0%;
}

/* ==================== Form Sections ==================== */
.form-section {
    display: none;
    animation: fadeIn var(--transition-base);
}

.form-section.active {
    display: block;
}

.section-header {
    margin-bottom: var(--spacing-2xl);
}

.question-number {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ==================== Form Groups ==================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.required {
    color: var(--accent-500);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-base);
    outline: none;
}

.form-input::placeholder {
    color: var(--text-tertiary);
}

.form-input:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.1);
    background: var(--surface);
}

.form-input:hover {
    border-color: var(--border-light);
}

/* ==================== Options Group ==================== */
.options-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.option-card {
    position: relative;
    cursor: pointer;
    display: block;
}

.option-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.option-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--surface-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.option-letter {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--border);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.option-text {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.option-card:hover .option-content {
    border-color: var(--primary-500);
    background: var(--surface);
    transform: translateX(4px);
}

.option-card:hover .option-letter {
    background: var(--primary-500);
    color: white;
}

.option-card input[type="radio"]:checked+.option-content {
    border-color: var(--primary-500);
    background: hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.1);
    box-shadow: 0 0 0 3px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.1);
}

.option-card input[type="radio"]:checked+.option-content .option-letter {
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
    color: white;
    box-shadow: var(--shadow-glow);
}

/* ==================== Buttons ==================== */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-base);
}

.btn:hover .btn-icon {
    transform: translateX(2px);
}

.btn-secondary:hover .btn-icon {
    transform: translateX(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
    color: white;
    box-shadow: var(--shadow-md);
    flex: 1;
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--surface-elevated);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary-500);
    background: var(--surface);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-500), hsl(145, 70%, 45%));
    color: white;
    box-shadow: var(--shadow-md);
    flex: 1;
}

.btn-success:hover {
    box-shadow: var(--shadow-lg), 0 0 20px hsla(145, 70%, 55%, 0.3);
    transform: translateY(-2px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ==================== Success Message ==================== */
.success-message {
    display: none;
    text-align: center;
    animation: fadeIn var(--transition-base);
}

.success-message.active {
    display: block;
}

.success-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-xl);
    background: linear-gradient(135deg, var(--success-500), hsl(145, 70%, 45%));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 0 30px hsla(145, 70%, 55%, 0.4);
    animation: scaleIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transition: all var(--transition-base);
}

.success-icon svg {
    width: 48px;
    height: 48px;
}

@keyframes scaleIn {
    0% {
        transform: scale(0);
    }

    100% {
        transform: scale(1);
    }
}

.success-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.success-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Score Display */
.score-display {
    margin: var(--spacing-2xl) 0;
    display: flex;
    justify-content: center;
}

.score-circle {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-full);
    border: 6px solid var(--primary-500);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--surface-elevated);
    box-shadow: var(--shadow-xl), 0 0 40px hsla(var(--primary-hue), var(--primary-sat), var(--primary-light), 0.3);
    animation: scaleIn 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 0.2s backwards;
    position: relative;
    transition: all var(--transition-base);
}

.score-value {
    font-family: 'Outfit', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-400), var(--accent-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.score-total {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-top: -0.5rem;
}

.score-message {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* ==================== Loading Overlay ==================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--spacing-lg);
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border);
    border-top-color: var(--primary-500);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==================== Footer ==================== */
.footer {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    color: var(--text-tertiary);
    font-size: 0.9375rem;
}

.footer strong {
    color: var(--primary-400);
    font-weight: 600;
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .logo-text {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .quiz-card {
        padding: var(--spacing-lg);
    }

    .section-title {
        font-size: 1.5rem;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .success-title {
        font-size: 1.5rem;
    }

    .score-circle {
        width: 150px;
        height: 150px;
    }

    .score-value {
        font-size: 3rem;
    }

    .score-total {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.75rem;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
    }

    .logo-icon svg {
        width: 24px;
        height: 24px;
    }

    .section-title {
        font-size: 1.25rem;
    }

    .option-content {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .option-letter {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
}