:root {
    --primary: #00f2ff;
    --secondary: #7000ff;
    --bg: #0a0b0d;
    --text: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.05);
    --border: rgba(255, 255, 255, 0.1);
}

body {
    margin: 0;
    font-family: 'Outfit', 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
}

.blob {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--secondary), transparent 70%);
    filter: blur(100px);
    opacity: 0.15;
    z-index: -1;
    top: -200px;
}

.container {
    width: 90%;
    max-width: 600px;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

.back-link {
    display: inline-block;
    color: var(--primary);
    text-decoration: none;
    margin-bottom: 20px;
    font-weight: 600;
}

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

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 30px;
    text-align: center;
    background: linear-gradient(135deg, #fff 30%, var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-screen,
.calculator-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 30px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.hidden {
    display: none !important;
}

input {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border);
    padding: 15px;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    outline: none;
    transition: all 0.3s;
    font-family: inherit;
}

input:focus {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 15px rgba(0, 242, 255, 0.2);
}

button {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    padding: 15px;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

button:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.contact-info {
    text-align: center;
    color: #888;
    font-size: 0.9rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.email-reveal {
    color: var(--primary);
    cursor: pointer;
    text-decoration: underline;
}

.info-box {
    background: rgba(0, 242, 255, 0.1);
    border: 1px solid var(--primary);
    padding: 15px;
    border-radius: 12px;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 20px;
    color: #ccc;
}

.warning-banner {
    background: rgba(231, 76, 60, 0.1);
    border: 2px solid #e74c3c;
    color: #e74c3c;
    padding: 15px;
    border-radius: 10px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.85rem;
}


.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-size: 0.9rem;
    color: #999;
    font-weight: 600;
}

.result-container {
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.result-label {
    font-size: 0.9rem;
    color: #999;
    margin-bottom: 5px;
}

.grade-display {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary);
    text-shadow: 0 0 20px rgba(0, 242, 255, 0.5);
}

.points-display {
    font-size: 0.8rem;
    color: #666;
    margin-top: 10px;
}

.version-switch {
    margin-top: 25px;
    padding-top: 15px;
    border-top: 1px dotted var(--border);
    text-align: center;
}

.version-switch p {
    font-size: 0.85rem;
    color: #888;
    margin: 0 0 10px 0;
}

.version-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

.comparison-section {
    margin-top: 40px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 25px;
    border-radius: 20px;
}

.comparison-section h3 {
    margin: 0 0 10px 0;
    color: var(--primary);
    font-size: 1.2rem;
}

.comparison-section p {
    font-size: 0.9rem;
    color: #ccc;
    line-height: 1.5;
    margin-bottom: 20px;
}

.comparison-img {
    width: 100%;
    border-radius: 10px;
    border: 1px solid var(--border);
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }
}