:root {
    --primary: #0a4275;
    --primary-light: #1665a8;
    --bg-color: #f4f7f9;
    --text-main: #2c3e50;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --danger: #d9534f;
    --danger-light: #fdf2f2;
    --success: #28a745;
    --success-light: #f0fdf4;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
}

/* HERO SECTION */
.hero {
    background-color: var(--primary);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
    border-bottom: 4px solid var(--primary-light);
    position: relative;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero h1 {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.hero p {
    color: #cbd5e1;
    font-weight: 300;
    font-size: 1.1rem;
}

/* PULSE ANIMATION */
.pulse-icon {
    width: 20px;
    height: 20px;
    background-color: #ff4757;
    border-radius: 50%;
    margin-bottom: 1rem;
    box-shadow: 0 0 0 0 rgba(255, 71, 87, 0.7);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 71, 87, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 15px rgba(255, 71, 87, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 71, 87, 0); }
}

/* MAIN CONTAINER */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* CARDS WRAPPER */
.cards-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--primary);
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}

/* FORM ELEMENTS */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
}

input, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    color: var(--text-main);
    background-color: #fff;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(22, 101, 168, 0.1);
}

/* TOOLTIP */
.tooltip {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 18px;
    height: 18px;
    background-color: #e2e8f0;
    color: var(--text-muted);
    border-radius: 50%;
    font-size: 0.75rem;
    margin-left: 0.5rem;
    cursor: help;
    position: relative;
    font-weight: 700;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: #fff;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s;
    pointer-events: none;
    z-index: 10;
    font-weight: 400;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}

/* SUBMIT BUTTON */
.button-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.submit-btn {
    background-color: var(--primary);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 1rem 3rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.submit-btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(22, 101, 168, 0.2);
}

/* SPINNER */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

.hidden {
    display: none !important;
}

/* RESULT CONTAINER */
#result-container {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    border-left: 6px solid #ccc;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    animation: fadeIn 0.5s ease-out;
}

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

#result-container.high-risk {
    border-left-color: var(--danger);
    background-color: var(--danger-light);
}

#result-container.low-risk {
    border-left-color: var(--success);
    background-color: var(--success-light);
}

#result-container h2 {
    margin-bottom: 0.5rem;
}

#result-container.high-risk h2 { color: var(--danger); }
#result-container.low-risk h2 { color: var(--success); }

/* CONFIDENCE BAR */
.confidence-wrapper {
    margin-top: 1.5rem;
}

.confidence-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.progress-bg {
    width: 100%;
    height: 10px;
    background-color: #e2e8f0;
    border-radius: 5px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 5px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

#result-container.high-risk .progress-fill { background-color: var(--danger); }
#result-container.low-risk .progress-fill { background-color: var(--success); }

/* DISCLAIMER */
.disclaimer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 2rem;
}

/* ABOUT PAGE STYLES */
.nav-links {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    display: flex;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    opacity: 0.8;
    transition: opacity 0.2s;
    border-bottom: 1px solid transparent;
}

.nav-link:hover {
    opacity: 1;
    border-bottom: 1px solid white;
}

.about-container {
    max-width: 750px;
    margin: 4rem auto;
    padding: 0 1.5rem;
    text-align: center;
}

.about-text {
    font-size: 1.15rem;
    color: var(--text-main);
    margin-bottom: 4rem;
    line-height: 1.7;
    font-weight: 300;
}

.stats-row {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-bottom: 4rem;
    flex-wrap: wrap;
}

.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.credits-section {
    border-top: 1px solid var(--border);
    padding-top: 3rem;
    margin-bottom: 3rem;
}

.credit-item {
    margin-bottom: 1.5rem;
    color: var(--text-main);
    font-size: 0.95rem;
}

.credit-link {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    margin-left: 0.75rem;
    font-size: 0.9rem;
}

.credit-link:hover {
    text-decoration: underline;
}