:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-background: rgba(255, 255, 255, 0.95);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --input-focus-ring: rgba(99, 102, 241, 0.2);
    --radius: 16px;
    --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --success-color: #10b981;
    --error-color: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--background-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: var(--card-background);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 550px;
    position: relative;
    overflow: hidden;
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    color: #1e1b4b; /* Darker indigo for heading */
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}

header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 90%;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #334155;
    margin-left: 0.25rem;
}

input, textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    background-color: #f8fafc;
    transition: all 0.2s ease;
    color: var(--text-primary);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #fff;
    box-shadow: 0 0 0 4px var(--input-focus-ring);
}

input::placeholder, textarea::placeholder {
    color: #94a3b8;
}

button {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(to right, #4f46e5, #6366f1);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2rem;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.hidden {
    display: none;
}

#statusMessage {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 12px;
    text-align: center;
    font-weight: 500;
    font-size: 0.95rem;
}

.success {
    background-color: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.error {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Spinner */
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 3px solid white;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: none;
}

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

button.loading span {
    display: none;
}

button.loading .spinner {
    display: block;
}

footer {
    text-align: center;
    margin-top: 2.5rem;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
}

footer p {
    color: var(--text-secondary);
}

/* Mobile optimizations */
@media (max-width: 480px) {
    .container {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
}