:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --accent: #818cf8;
    --accent-gradient: linear-gradient(135deg, #818cf8 0%, #6366f1 100%);
    --text: #f8fafc;
    --border: #334155;
    --hover: rgba(129, 140, 248, 0.1);
    --radius: 12px;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --error: #ef4444;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}
body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: grid;
    place-items: center;
    line-height: 1.6;
}
.auth-section {
    width: 100%;
    max-width: 440px;
    margin: 1rem;
    padding: 3rem 2.5rem;
    background: var(--surface);
    border-radius: calc(var(--radius) * 2);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}
.form-header {
    text-align: center;
    margin-bottom: 2.5rem;
    position: relative;
}
.form-header h2 {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.form-header p {
    color: rgba(248, 250, 252, 0.8);
    font-size: 0.95rem;
    max-width: 300px;
    margin: 0 auto;
}
.input-container {
    position: relative;
    margin-bottom: 1.75rem;
}
.input-container input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.input-container input:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.15);
}
.input-container label {
    position: absolute;
    left: 3rem;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(248, 250, 252, 0.6);
    pointer-events: none;
    transition: all 0.3s ease;
}
.input-container input: focus ~ label, ;
.input-container input:not(:placeholder-shown) ~ label {
    top: -0.6rem;
    left: 1rem;
    font-size: 0.85rem;
    color: var(--accent);
    background: var(--surface);
    padding: 0 0.5rem;
}
.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: rgba(248, 250, 252, 0.6);
    transition: color 0.3s ease;
}
.input-container input:focus ~ .input-icon {
    color: var(--accent);
}
.auth-button {
    width: 100%;
    padding: 1.125rem;
    background: var(--accent-gradient);
    color: var(--text);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}
.auth-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.4);
}
.form-footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.95rem;
    color: rgba(248, 250, 252, 0.8);
}
.form-link {
    color: var(--accent);
    font-weight: 500;
    text-decoration: none;
    position: relative;
}
.form-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width 0.3s ease;
}
.form-link:hover::after {
    width: 100%;
}
.auth-form {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    width: 100%;
}
.auth-form.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    padding: 3rem 2.5rem;
}
.error-message {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--error);
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}
@media (max-width: 480px) {
    .auth-section {
        padding: 2rem 1.5rem;
    }
    .input-container input {
        padding-left: 2.75rem;
    }
}