/**
 * Main CSS Styles
 * Adaptive English Assessment Platform
 * Modern, responsive design with CSS custom properties
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Variables)
   ============================================ */
:root {
    /* Primary Colors (dynamically overridden by branding) */
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --highlighter-color: #FCD34D;

    /* Neutral Colors */
    --bg-color: #F8FAFC;
    --card-bg: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border-color: #E2E8F0;

    /* State Colors */
    --success-color: #10B981;
    --error-color: #EF4444;
    --warning-color: #F59E0B;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
}

/* ============================================
   BASE STYLES
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    min-height: 100vh;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   HEADER
   ============================================ */
.test-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.academy-logo {
    max-height: 25px;
    width: auto;
    object-fit: contain;
}

.academy-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.test-header.hidden {
    display: none;
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress-container {
    height: 4px;
    background: var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--highlighter-color));
    transition: width var(--transition-slow);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

/* Step visibility */
.step {
    display: none;
    width: 100%;
    max-width: 600px;
    animation: fadeIn var(--transition-normal);
}

.step.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

/* ============================================
   LOADING STATE
   ============================================ */
#loading-screen {
    text-align: center;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

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

/* ============================================
   ERROR STATE
   ============================================ */
.error-card {
    text-align: center;
    padding: var(--spacing-2xl);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.error-card h2 {
    margin-bottom: var(--spacing-md);
    color: var(--error-color);
}

/* ============================================
   WELCOME SCREEN
   ============================================ */
.welcome-card {
    text-align: center;
}

.welcome-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--text-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-message {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

.btn-icon-left {
    margin-right: var(--spacing-xs);
}

/* ============================================
   FORM STYLES
   ============================================ */
.form-card {
    text-align: center;
}

.form-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.form-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.contact-form {
    text-align: left;
}

.form-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

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

.floating-label input {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-sm);
    font-size: var(--font-size-base);
    font-family: inherit;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-bg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.floating-label input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 15%, transparent);
}

.floating-label label {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-base);
    color: var(--text-muted);
    pointer-events: none;
    transition: all var(--transition-fast);
    background: var(--card-bg);
    padding: 0 var(--spacing-xs);
}

.floating-label input:focus+label,
.floating-label input:not(:placeholder-shown)+label {
    top: 0;
    font-size: var(--font-size-xs);
    color: var(--primary-color);
}

/* Static Label (for phone input) */
.static-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Phone Input Override */
.iti {
    width: 100%;
}

.iti__selected-flag {
    padding-left: var(--spacing-md);
}

#mobile {
    width: 100%;
    padding: var(--spacing-md);
    padding-left: 52px;
    font-size: var(--font-size-base);
    font-family: inherit;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    direction: ltr;
    text-align: left;
}

#mobile:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 15%, transparent);
}

.field-error {
    display: block;
    color: var(--error-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* Checkbox */
.checkbox-group {
    margin-top: var(--spacing-lg);
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: var(--spacing-sm);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.checkbox-label input:checked+.checkbox-custom {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input:checked+.checkbox-custom::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.checkbox-text {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Hide form fields dynamically */
.form-group.hidden {
    display: none;
}

/* ============================================
   QUESTION SCREEN
   ============================================ */
.question-card {
    text-align: left;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.level-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--highlighter-color));
    color: white;
    font-weight: 600;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-full);
}

.question-count {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.question-media {
    margin-bottom: var(--spacing-lg);
}

.question-media img {
    max-width: 100%;
    border-radius: var(--radius-md);
}

.question-media audio,
.question-media video {
    width: 100%;
    border-radius: var(--radius-md);
}

.question-text {
    font-size: var(--font-size-xl);
    font-weight: 500;
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

/* Answer Options */
.answer-options {
    display: grid;
    gap: var(--spacing-md);
}

.answer-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-lg);
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    font-family: inherit;
    font-size: var(--font-size-base);
}

.answer-btn:hover {
    border-color: var(--primary-color);
    background: color-mix(in srgb, var(--primary-color) 5%, transparent);
    transform: translateX(4px);
}

.answer-btn.selected {
    border-color: var(--primary-color);
    background: color-mix(in srgb, var(--primary-color) 10%, transparent);
}

.answer-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Loading state — shown while waiting for server response after clicking an answer */
.answer-btn.loading {
    pointer-events: none;
}

.answer-btn.loading .option-letter {
    position: relative;
    background: var(--primary-color);
    color: transparent; /* hide the letter */
}

.answer-btn.loading .option-letter::after {
    content: '';
    position: absolute;
    inset: 4px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin-answer 0.65s linear infinite;
}

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

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-color);
    border-radius: var(--radius-full);
    font-weight: 600;
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.answer-btn:hover .option-letter,
.answer-btn.selected .option-letter {
    background: var(--primary-color);
    color: white;
}

.option-text {
    flex: 1;
}

/* IDK Button */
.idk-btn {
    display: block;
    width: 100%;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.idk-btn:hover {
    color: var(--text-secondary);
    text-decoration: underline;
}

.idk-btn.hidden {
    display: none;
}

/* Back Button */
.back-btn {
    display: block;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.back-btn:hover {
    color: var(--primary-color);
}

/* ============================================
   SALES SCREEN
   ============================================ */
.sales-card {
    text-align: center;
}

.sales-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
}

.sales-question {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.sales-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   RESULTS SCREEN
   ============================================ */
.results-card {
    text-align: center;
}

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

.results-header h2 {
    font-size: var(--font-size-2xl);
}

.confetti-left,
.confetti-right {
    font-size: 2rem;
    animation: bounce 1s ease infinite;
}

.confetti-right {
    animation-delay: 0.5s;
}

@keyframes bounce {

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

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

.result-level {
    margin-bottom: var(--spacing-xl);
}

.result-label {
    display: block;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.level-display {
    font-size: 5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--highlighter-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.level-name {
    display: block;
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    font-weight: 500;
}

.thank-you-message {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.share-toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
}

.share-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ============================================
   MODAL
   ============================================ */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 400px;
    box-shadow: var(--shadow-xl);
    animation: modalIn var(--transition-normal);
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.modal-content h2 {
    margin-bottom: var(--spacing-md);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 640px) {
    .main-content {
        padding: var(--spacing-md);
    }

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

    .welcome-title {
        font-size: var(--font-size-2xl);
    }

    .level-display {
        font-size: 4rem;
    }

    .sales-buttons {
        flex-direction: column;
    }

    .result-actions {
        flex-direction: column;
    }

    .btn-large {
        width: 100%;
    }
}

/* Phone Number Input - always LTR */
input[type="tel"] {
    direction: ltr !important;
    text-align: left !important;
}

/* RTL Support */
[dir="rtl"] .answer-btn:hover {
    transform: translateX(-4px);
}

[dir="rtl"] .btn:hover .btn-icon {
    transform: translateX(-4px);
}

/* ============================================
   RESULT PAGE SPECIFIC STYLES
   ============================================ */
.result-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--bg-color) 0%, #E0E7FF 100%);
}

.result-container {
    max-width: 500px;
    width: 100%;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.stat-card {
    background: var(--bg-color);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.not-found {
    text-align: center;
}

.not-found h2 {
    color: var(--error-color);
    margin-bottom: var(--spacing-md);
}