* {
    box-sizing: border-box;
}

:root {
    color-scheme: light;
    --page-bg: #f0f2f5;
    --page-pattern: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239C92AC' fill-opacity='0.1'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
    --panel-bg: #ffffff;
    --panel-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --heading: #333333;
    --button-bg: #4a90e2;
    --button-shadow: rgba(74, 144, 226, 0.4);
    --button-shadow-hover: rgba(74, 144, 226, 0.6);
    --toggle-bg: #edf2f7;
    --toggle-text: #1f2937;
    --toggle-border: #d8e0ea;
    --section-border: #e5e7eb;
    --body-text: #4b5563;
    --field-bg: #ffffff;
    --field-border: #cfd8e3;
    --field-focus: rgba(74, 144, 226, 0.22);
    --success: #047857;
    --error: #dc2626;
}

body[data-theme="dark"] {
    color-scheme: dark;
    --page-bg: #111827;
    --page-pattern: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23CBD5E1' fill-opacity='0.08'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
    --panel-bg: #1f2937;
    --panel-shadow: 0 14px 35px rgba(0, 0, 0, 0.35);
    --heading: #f8fafc;
    --button-bg: #60a5fa;
    --button-shadow: rgba(96, 165, 250, 0.3);
    --button-shadow-hover: rgba(96, 165, 250, 0.45);
    --toggle-bg: #111827;
    --toggle-text: #f8fafc;
    --toggle-border: #374151;
    --section-border: #374151;
    --body-text: #d1d5db;
    --field-bg: #111827;
    --field-border: #4b5563;
    --field-focus: rgba(96, 165, 250, 0.28);
    --success: #34d399;
    --error: #f87171;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    background-color: var(--page-bg);
    background-image: var(--page-pattern);
    transition: background-color 0.25s ease;
}

.container {
    position: relative;
    width: min(100%, 560px);
    text-align: center;
    background-color: var(--panel-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--panel-shadow);
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.theme-toggle {
    position: absolute;
    top: 16px;
    right: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 38px;
    border: 1px solid var(--toggle-border);
    border-radius: 999px;
    padding: 8px 14px;
    background-color: var(--toggle-bg);
    color: var(--toggle-text);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.theme-toggle:hover {
    transform: translateY(-1px);
}

.theme-toggle__icon {
    width: 16px;
    text-align: center;
}

h1 {
    color: var(--heading);
    margin-top: 28px;
    margin-bottom: 30px;
    transition: color 0.25s ease;
}

h2 {
    margin: 0 0 20px;
    color: var(--heading);
    font-size: 24px;
    transition: color 0.25s ease;
}

.lotto-numbers {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    min-height: 60px;
    margin-bottom: 40px;
}

.lotto-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: white;
    animation: pop-in 0.5s ease-out;
}

.generate-btn {
    background-color: var(--button-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--button-shadow);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--button-shadow-hover);
}

.partnership {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--section-border);
    text-align: left;
    transition: border-color 0.25s ease;
}

.partnership-form {
    display: grid;
    gap: 16px;
}

.form-row {
    display: grid;
    gap: 8px;
}

.form-row label {
    color: var(--body-text);
    font-size: 14px;
    font-weight: 700;
    transition: color 0.25s ease;
}

.form-row input,
.form-row textarea {
    width: 100%;
    border: 1px solid var(--field-border);
    border-radius: 8px;
    padding: 12px 14px;
    background-color: var(--field-bg);
    color: var(--heading);
    font: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.25s ease, color 0.25s ease;
}

.form-row textarea {
    resize: vertical;
    min-height: 120px;
}

.form-row input:focus,
.form-row textarea:focus {
    border-color: var(--button-bg);
    box-shadow: 0 0 0 4px var(--field-focus);
    outline: none;
}

.submit-btn {
    justify-self: start;
    border: none;
    border-radius: 8px;
    padding: 12px 22px;
    background-color: var(--button-bg);
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 15px var(--button-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.25s ease;
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--button-shadow-hover);
}

.submit-btn:disabled {
    cursor: wait;
    opacity: 0.72;
    transform: none;
}

.form-status {
    min-height: 20px;
    margin: 0;
    color: var(--body-text);
    font-size: 14px;
    transition: color 0.25s ease;
}

.form-status.is-success {
    color: var(--success);
}

.form-status.is-error {
    color: var(--error);
}

@media (max-width: 480px) {
    .container {
        padding: 72px 20px 28px;
    }

    .theme-toggle {
        top: 18px;
        right: 18px;
    }

    h1 {
        margin-top: 0;
        font-size: 28px;
    }

    .lotto-ball {
        width: 52px;
        height: 52px;
        font-size: 21px;
    }

    .submit-btn {
        width: 100%;
    }
}

@keyframes pop-in {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}