:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --error-color: #ef4444;
    --success-color: #22c55e;
    --border-color: rgba(148, 163, 184, 0.1);
    --input-bg: rgba(15, 23, 42, 0.6);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1.5;
    overflow-x: hidden;
    position: relative;
}

/* Animated Background Mesh */
body::before {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15), transparent 50%),
        radial-gradient(circle at 0% 0%, rgba(139, 92, 246, 0.15), transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(16, 185, 129, 0.15), transparent 50%);
    z-index: -1;
    animation: backgroundMove 20s ease-in-out infinite alternate;
}

@keyframes backgroundMove {
    0% {
        transform: translate(-5%, -5%) scale(1);
    }

    100% {
        transform: translate(5%, 5%) scale(1.1);
    }
}

.container {
    width: 100%;
    max-width: 480px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    position: relative;
    z-index: 1;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 3rem 2.5rem;
    border-radius: 1.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    width: 100%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.1);
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    margin-left: 0.25rem;
}

input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
}

input::placeholder {
    color: rgba(148, 163, 184, 0.5);
}

input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
    background: rgba(30, 41, 59, 0.8);
}

button {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

button::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px var(--accent-glow), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

button:hover::after {
    transform: translateX(100%);
}

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

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    filter: grayscale(0.5);
}

.message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 0.75rem;
    font-size: 0.9rem;
    text-align: center;
    animation: slideIn 0.3s ease-out;
    backdrop-filter: blur(4px);
}

.message.success {
    background-color: rgba(34, 197, 94, 0.1);
    color: #4ade80;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.message.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    opacity: 0.6;
    margin-top: 1rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Loading Spinner */
.spinner {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Responsive */
@media (max-width: 480px) {
    .card {
        padding: 2rem 1.5rem;
    }

    header h1 {
        font-size: 2rem;
    }
}