:root {
    --primary: #f97316; /* Orange */
    --primary-hover: #ea580c;
    --bg-main: #0B1110; /* Dark Navy/Greenish from main site */
    --bg-card: #18231e;
    --text-white: #ffffff;
    --text-muted: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.1);
    --error: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-white);
    line-height: 1.6;
    padding-bottom: 100px; /* space for sticky footer */
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.app-header {
    text-align: center;
    padding: 40px 0 20px;
}
.app-header h1 {
    font-size: 2rem;
    color: var(--text-white);
    margin-bottom: 10px;
}
.app-header p {
    color: var(--text-muted);
}

/* Progress Bar */
.progress-container {
    width: 100%;
    background: var(--bg-card);
    height: 8px;
    border-radius: 4px;
    margin: 30px 0;
    overflow: hidden;
}
.progress-bar {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.4s ease;
}

/* Form Steps */
.form-step {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
}
.form-step.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.step-title {
    font-size: 1.5rem;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 8px;
    display: inline-block;
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-white);
    font-size: 1rem;
    transition: border-color 0.3s;
}
.form-control option {
    background-color: var(--bg-main);
    color: var(--text-white);
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}
.error-border {
    border-color: var(--error) !important;
}

/* Question Blocks */
.question-block {
    background: var(--bg-card);
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}
.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.question-number {
    background: rgba(249, 115, 22, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}
.question-module {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}
.question-text {
    font-size: 1.1rem;
    margin-bottom: 20px;
    font-weight: 500;
}

/* Radio Options as Custom Cards */
.options-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.option-label {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.option-label:hover {
    background: rgba(255, 255, 255, 0.08);
}
.option-label input[type="radio"] {
    display: none;
}
.option-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    margin-right: 12px;
    position: relative;
    flex-shrink: 0;
}
.option-label input[type="radio"]:checked + .option-custom {
    border-color: var(--primary);
}
.option-label input[type="radio"]:checked + .option-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: var(--primary);
    border-radius: 50%;
}
.option-label input[type="radio"]:checked ~ .option-text {
    color: var(--primary);
    font-weight: 600;
}
.option-label:has(input[type="radio"]:checked) {
    border-color: var(--primary);
    background: rgba(249, 115, 22, 0.05);
}

/* Footer / Sticky Buttons */
.form-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 16px 20px;
    display: flex;
    justify-content: center;
    z-index: 100;
}
.form-footer .container {
    padding: 0;
    display: flex;
    justify-content: space-between;
    width: 100%;
}
.btn {
    padding: 12px 28px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--text-muted);
    color: var(--text-white);
}
.btn-outline:hover {
    border-color: var(--text-white);
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-hover);
}
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Results Screen */
.result-header {
    text-align: center;
    margin-bottom: 40px;
}
.score-container {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}
.score-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: conic-gradient(var(--circle-color) 0%, var(--circle-color) var(--progress, 0%), #333 var(--progress, 0%), #333 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    transition: background 1s ease-out;
}
.score-circle::before {
    content: '';
    position: absolute;
    width: 140px;
    height: 140px;
    background-color: var(--bg-body);
    border-radius: 50%;
}
.score-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.score-content #res-score {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--text-white);
}
.score-content span:last-child {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--text-muted);
    margin-top: 2px;
}
.level-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(255,255,255,0.1);
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}
.result-card {
    background: var(--bg-card);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}
.result-card h3 {
    color: var(--primary);
    margin-bottom: 16px;
    font-size: 1.2rem;
}
.result-card ul {
    list-style-position: inside;
    color: var(--text-muted);
}
.result-card ul li {
    margin-bottom: 8px;
}
.cta-box {
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.1) 0%, rgba(249, 115, 22, 0.02) 100%);
    border: 1px solid var(--primary);
    text-align: center;
}
.cta-box h3 {
    font-size: 1.4rem;
}

.spin {
    animation: spin 1s linear infinite;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Logo in header */
.logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-white);
    text-decoration: none;
    letter-spacing: 1px;
}
.logo span {
    color: var(--primary);
}

/* Modal Styles */
.modal {
    display: none; 
    position: fixed; 
    z-index: 1000; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(0,0,0,0.8); 
    backdrop-filter: blur(5px);
}
.modal-content {
    background-color: var(--bg-card);
    margin: 10% auto; 
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    position: relative;
    box-shadow: 0 15px 30px rgba(0,0,0,0.5);
    animation: modalFadeIn 0.3s ease-out;
}
@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}
.close-modal {
    color: var(--text-muted);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}
.close-modal:hover,
.close-modal:focus {
    color: var(--primary);
    text-decoration: none;
}

/* Uu tiên c?i ti?n Pill Styles */
.priority-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 10px;
}

.priority-pill {
    position: relative;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1.5px solid transparent;
    opacity: 0.8;
}
.priority-pill:hover {
    opacity: 1;
}

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

/* Bi?u tu?ng checkmark tru?c ch? */




.priority-pill:has(input[type="checkbox"]:checked) {
    opacity: 1;
    border-color: var(--primary);
    background-color: rgba(249, 115, 22, 0.1);
    color: var(--primary);
    transform: scale(1.02);
}


/* PDF Export Mode (White background, Black text) */
.pdf-export-mode {
    background-color: #ffffff !important;
    color: #000000 !important;
    padding: 20px !important;
}
.pdf-export-mode h2,
.pdf-export-mode h3,
.pdf-export-mode h4,
.pdf-export-mode p,
.pdf-export-mode li,
.pdf-export-mode span {
    color: #000000 !important;
}
.pdf-export-mode .score-legend {
    background-color: #f9fafb !important;
    border-color: #e5e7eb !important;
}
.pdf-export-mode .score-legend span {
    border: 1px solid #000 !important;
}
.pdf-export-mode .level-badge {
    color: #ffffff !important;
    border: 2px solid #000 !important;
}
.pdf-export-mode .score-circle {
    background: none !important;
    border: 16px solid var(--circle-color) !important;
}
.pdf-export-mode .score-content span {
    color: #000000 !important;
}
.pdf-export-mode .result-card {
    background-color: #ffffff !important;
    border: 1px solid #cccccc !important;
    box-shadow: none !important;
}


/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 1000;
    backdrop-filter: blur(5px);
}
.modal-content {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-darker);
    padding: 30px;
    border-radius: 16px;
    width: 90%;
    max-width: 600px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}
.modal-close {
    position: absolute;
    top: 15px; right: 15px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}
.modal-close:hover {
    color: var(--text-white);
}