:root {
    --primary: #1E293B;
    --accent: #3B82F6;
    --accent-hover: #2563EB;
    --bg-gradient: linear-gradient(135deg, #F8FAFC 0%, #E2E8F0 100%);
    --card-bg: rgba(255, 255, 255, 0.9);
    --text-main: #0F172A;
    --text-muted: #64748B;
}

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

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-main);
}

.signup-container {
    max-width: 500px;
    width: 100%;
    perspective: 1000px;
}

.signup-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.5);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.brand {
    text-align: center;
    margin-bottom: 32px;
}

.brand h1 {
    font-size: 2rem;
    color: var(--primary);
    font-weight: 800;
}

.brand span {
    color: var(--accent);
}

.form-title {
    margin-bottom: 24px;
    text-align: center;
}

.form-title h2 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.form-title p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--primary);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper .material-icons-outlined {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    font-size: 20px;
}

.form-control {
    width: 100%;
    padding: 12px 12px 12px 45px;
    border: 1.5px solid #E2E8F0;
    border-radius: 12px;
    font-size: 0.95rem;
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

.btn-submit:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.2);
}

.btn-submit:active {
    transform: translateY(0);
}

/* Loading Overlay */
#loading-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(255, 255, 255, 0.95);
    z-index: 1000;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.loading-subtext {
    color: var(--text-muted);
    margin-top: 10px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Success Message */
.success-card {
    display: none;
    text-align: center;
}

.success-icon {
    font-size: 64px;
    color: #10B981;
    margin-bottom: 20px;
}

@media (max-width: 480px) {
    .signup-card {
        padding: 30px 20px;
    }
}