:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-color);
    background-image: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.15), transparent 25%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 600px;
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.6s ease-out;
    text-align: center;
}

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

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

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #60a5fa, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.5;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #60a5fa, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 2rem;
}

h3 {
    margin-bottom: 2rem;
}

a {
    color: var(--primary);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Alpha/Unsubscribe specifics */
.chance-notice {
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--primary);
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    margin-bottom: 2rem;
    font-size: 0.9rem;
    color: #bfdbfe;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.device-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    position: relative;
    transition: transform 0.3s ease;
    text-align: left;
}

.device-card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

.device-card h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #cbd5e1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.remove-device {
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
}

.remove-device:hover {
    text-decoration: underline;
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
    margin-top: 1rem;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px dashed var(--primary);
    margin-bottom: 1.5rem;
}

.btn-secondary:hover {
    background: rgba(59, 130, 246, 0.1);
}

.footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: inherit;
}

.footer a:hover {
    color: #60a5fa;
    text-decoration: underline;
}

#message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 12px;
    text-align: center;
    display: none;
}

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

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