:root {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #0f172a;

    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-inv: #ffffff;

    --primary: #6366f1;
    --primary-hover: #818cf8;
    --primary-glow: rgba(99, 102, 241, 0.25);

    --border-base: #334155;
    --border-focus: #6366f1;

    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    height: 100%;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    margin: 0;
    line-height: 1.6;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    padding: 2rem 1rem;
}

h1 {
    margin-top: 0;
    margin-bottom: 2rem;
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.025em;
}

.form-container {
    background-color: var(--bg-card);
    width: 100%;
    max-width: 720px;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-base);
    margin: auto 0; 
}

.field {
    margin-bottom: 1.8rem;
    width: 100%;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    margin: 0;
}

.label-content {
    display: flex;
    flex-direction: column;
}

.label-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
}

.checkbox-desc {
    margin: 4px 0 0 0;
}

label {
    display: block;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
    color: var(--text-main);
}

.desc {
    display: block;
    font-weight: 400;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
    overflow-wrap: break-word; 
}

input:not([type="checkbox"]),
textarea,
select {
    display: block;
    width: 100%; 
    padding: 0.8rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-main);
    background-color: var(--bg-input);
    border: 1.5px solid var(--border-base);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    outline: none;
    -webkit-appearance: none;
}

input:not([type="checkbox"]):focus,
textarea:focus,
select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px var(--primary-glow);
    background-color: var(--bg-card);
}

input[type="checkbox"] {
    -webkit-appearance: none;
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    background-color: var(--bg-input);
    border: 1.5px solid var(--border-base);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    display: inline-grid;
    place-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

input[type="checkbox"]:hover {
    border-color: var(--primary);
}

input[type="checkbox"]:checked {
    background-color: var(--primary);
    border-color: var(--primary);
}

input[type="checkbox"]::before {
    content: "";
    width: 0.65rem;
    height: 0.65rem;
    transform: scale(0);
    transition: 120ms transform ease-in-out;
    box-shadow: inset 1rem 1rem var(--text-inv);
    transform-origin: bottom left;
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

input[type="checkbox"]:checked::before {
    transform: scale(1);
}

input[type="checkbox"]:focus {
    box-shadow: 0 0 0 4px var(--primary-glow);
    outline: none;
}

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

select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.1rem;
    padding-right: 2.5rem;
}

.submit-container {
    margin-top: 2.5rem;
}

button {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--primary);
    color: var(--text-inv);
    transition: all 0.2s ease;
}

button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }
    .form-container {
        padding: 1.5rem;
        border-radius: 12px;
        margin-top: 0;
    }
    .field {
        margin-bottom: 1.5rem;
    }
}