:root {
    --bg:           #191A1E;
    --surface:      rgba(36,38,44,0.82);
    --surface-hover: rgba(48,50,58,0.90);
    --accent:       #808894;
    --accent-glow:  rgba(128,136,148,0.20);
    --text:         rgba(240,242,246,0.92);
    --text-muted:   rgba(240,242,246,0.50);
    --border:       rgba(255,255,255,0.10);
    --error: #ff6b6b;
    --success: #81c784;
}

body {
    background:
        radial-gradient(ellipse at 15% 85%, rgba(128,136,148,0.20) 0%, transparent 55%),
        radial-gradient(ellipse at 80% 10%, rgba(0,0,0,0.65) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(128,136,148,0.09) 0%, transparent 45%),
        #191A1E;
    color: var(--text);
    font-family: 'Inter', 'Google Sans', system-ui, sans-serif;
    margin: 0;
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    font-size: 1rem;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.centered-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: none;
    gap: 1.5rem;
}

h1, h2 {
    font-size: 1.5rem;
    color: var(--text);
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

form {
    background: var(--surface);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem 2rem 2rem 2rem;
    max-width: 400px;
    width: 100%;
    margin: 0 auto;
    box-shadow: 0 12px 48px rgba(0,0,0,0.30), 0 3px 8px rgba(0,0,0,0.15);
}

label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    display: block;
    font-weight: 400;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 0.85rem 1rem;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 1.2rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder {
    color: var(--text-muted);
}

button[type="submit"], .btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.85rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: filter 0.15s, transform 0.15s;
    box-shadow: 0 4px 20px var(--accent-glow);
    width: 100%;
}

button[type="submit"]:hover, .btn-primary:hover {
    filter: brightness(1.10);
    transform: translateY(-1px);
}

.form-group {
    margin-bottom: 1.2rem;
}

.text-center {
    text-align: center;
}

.text-danger {
    color: var(--error);
    background: rgba(229,57,53,0.15);
    padding: 12px;
    border-radius: 8px;
    margin-top: 1rem;
    font-size: 0.9rem;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.15s;
}

a:hover {
    opacity: 0.8;
}