* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;

    font-family: Arial, sans-serif;

    background:
        radial-gradient(circle at top left, #4f46e5, transparent 35%),
        radial-gradient(circle at bottom right, #9333ea, transparent 35%),
        #0f172a;

    color: white;
}

.app {
    width: 90%;
    max-width: 800px;
    margin: auto;
    padding: 50px 0;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

header p {
    color: #cbd5e1;
}

.create-box {
    padding: 25px;

    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);

    border-radius: 20px;

    backdrop-filter: blur(15px);

    margin-bottom: 40px;
}

input,
textarea {
    width: 100%;

    padding: 14px;

    margin-top: 10px;
    margin-bottom: 15px;

    border: none;
    border-radius: 10px;

    background: rgba(255, 255, 255, 0.1);

    color: white;

    outline: none;

    font-size: 16px;
}

textarea {
    min-height: 150px;
    resize: vertical;
}

input::placeholder,
textarea::placeholder {
    color: #cbd5e1;
}

button {
    width: 100%;

    padding: 14px;

    border: none;
    border-radius: 10px;

    background: white;
    color: #111827;

    font-size: 16px;
    font-weight: bold;

    cursor: pointer;

    transition: 0.2s;
}

button:hover {
    transform: translateY(-2px);
}

#capsules {
    display: grid;
    gap: 15px;
}

.capsule {
    padding: 20px;

    background: rgba(255, 255, 255, 0.1);

    border: 1px solid rgba(255, 255, 255, 0.15);

    border-radius: 16px;

    backdrop-filter: blur(10px);
}

.capsule h3 {
    margin-top: 0;
}

.locked {
    color: #fbbf24;
}

.unlocked {
    color: #86efac;
}