/* reset default browser styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* bottom background colour */
    --bg-color: #1e293b;
    --bottom-bg: #1e293b;
    /* image banner background */
    --top-bg-image: url("app_launch.jpg");
    --top-bg: #1e293b;

    /* main card styling */
    --card-bg: white;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-label: #374151;
    --shadow-color: rgba(0, 0, 0, 0.8);
    --list-border: #FF739B;

    /* component styling */
    --error-color: #dc2626;
    --success-color: #16a34a;

    --input-border: #d1d5db;
    --input-text: #111827;
    --input-bg: white;
    --input-focus: #2563eb;

    --button-bg: #2563eb;
    --button-hover: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
    :root {
        /* bottom background colour */
        --bg-color: #1e293b;
        --bottom-bg: #1e293b;
        /* image banner background */
        --top-bg-image: url("app_launch_dark.jpg");
        --top-bg: #1e293b;
        --shadow-color: rgba(0, 0, 0, 0.9);
        --list-border: #FF78AA;
        
        /* main card styling */
        --card-bg: #000000;
        --text-primary: #f9fafb;
        --text-secondary: #9ca3af;
        --text-label: #e5e7eb;
        /* component styling */
        --error-color: #ef4444;
        --success-color: #158940;

        --input-border: #4b5563;
        --input-text: #f9fafb;
        --input-bg: #111827;
        --input-focus: #60a5fa;

        --button-bg: #3b82f6;
        --button-hover: #2563eb;
    }
}

body {
    font-family: sans-serif;
    min-height: 100dvh;
    width: 100vw;
    overflow-x: hidden;
    /* use flexbox to center the form overlay */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

/* background container handling the split view */
.background-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    z-index: -1;
}

/* top half with image placeholder */
.bg-top {
    flex: 1;
    background-color: var(--top-bg);
    background-image: var(--top-bg-image);
    background-size: cover;
    background-position: center;
}

/* bottom half with fixed colour */
.bg-bottom {
    flex: 1;
    background-color: var(--bottom-bg);
}

/* main form card */
.card {
    background: var(--card-bg);
    padding: 2.0rem;
    border-radius: 12px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 20px 25px -5px var(--shadow-color), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    margin: 1rem;
}

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

.card-header h1 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-header img {
    width: 80px;
    margin-bottom: 1.0rem;
}

.card-header p {
    color: var(--text-primary);
    font-size: 1rem;
}

.card p {
    color: var(--text-primary);
    font-size: 0.9rem;
}

.card li {
    color: var(--text-primary);
    font-size: 0.9rem;
    margin: 0.2em;
}

.card li::marker {
    color: var(--list-border);
}

.card ul {
    margin: 1em 1em;
    padding-left: 1.3em;
    position: relative;
}

.card ul::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    background: var(--list-border);
    border-radius: 10px;
}

.card-footer {
    margin-bottom: 0rem;
    margin-top: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    text-align: center;
}

.card-footer a {
     color: var(--text-secondary);
     text-decoration: none;
}

.card-footer a:hover {
    text-decoration: underline;
}

/* form group styling */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-label);
    margin-bottom: 0.5rem;
}

/* custom input styling */
input[type="email"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--input-text);
    background-color: var(--input-bg);
    transition: border-color 0.15s ease;
}

input[type="email"]:focus,
select:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

input[type="checkbox"] {
    margin-top: 0.25rem;
    width: 1rem;
    height: 1rem;
    cursor: pointer;
    accent-color: var(--button-bg);
}

.checkbox-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* submit button styling */
button[type="submit"] {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s ease;
    font-size: 0.875rem;
}

button[type="submit"]:hover {
    background-color: var(--button-hover);
}

.hp-field {
    opacity: 0;
    position: absolute;
    top: 0;
    left: 0;
    height: 0;
    width: 0;
    z-index: -1;
}

/* turnstile container margin */
.turnstile-container {
    margin-bottom: 1.25rem;
    display: flex;
    justify-content: center;
}

.error-icon {
    color: var(--error-color);
    font-size: 3rem;
    margin-bottom: 0.2rem;
    display: block;
}

.success-icon {
    color: var(--success-color);
    font-size: 3rem;
    margin-bottom: 0.2rem;
    display: block;
}

.card .status {
    color: var(--error-color);
    text-align: center;
    margin-bottom: 1em;
    font-weight: bolder;
}

.btn-home {
    display: block;
    width: fit-content;
    margin: 1.5rem auto 0 auto;
    padding: 0.75rem 1.5rem;
    background-color: var(--button-bg);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color 0.15s;
}

.btn-home:hover {
    background-color: var(--button-hover);
}