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

:root {
    --bg-start: #0f172a;
    --bg-end: #1e293b;
    --card-bg: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    --error-text: #b91c1c;
    --success: #16a34a;
    --shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
    --shadow-mobile: 0 10px 30px -8px rgba(15, 23, 42, 0.25);
    --radius: 16px;
    --radius-sm: 10px;
    --touch-min: 44px;
    --page-padding: 1rem;
    --card-padding: 1.25rem;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    background: linear-gradient(135deg, var(--bg-start) 0%, var(--bg-end) 50%, #312e81 100%);
    background-attachment: fixed;
}

.page-wrapper {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--page-padding);
    padding-top: max(var(--page-padding), env(safe-area-inset-top));
    padding-right: max(var(--page-padding), env(safe-area-inset-right));
    padding-bottom: max(var(--page-padding), env(safe-area-inset-bottom));
    padding-left: max(var(--page-padding), env(safe-area-inset-left));
}

.form-card {
    width: 100%;
    max-width: 760px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-mobile);
    padding: var(--card-padding);
}

.form-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    margin-bottom: 0.75rem;
}

.form-header h1 {
    font-size: clamp(1.35rem, 4.5vw, 1.75rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    line-height: 1.25;
    word-wrap: break-word;
}

.form-header p {
    color: var(--text-muted);
    font-size: clamp(0.875rem, 2.5vw, 0.95rem);
    max-width: 36rem;
    margin: 0 auto;
}

.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
}

.alert-error {
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-text);
}

.alert ul {
    margin-top: 0.5rem;
    padding-left: 1.25rem;
}

.form-section {
    margin-bottom: 1.5rem;
}

.form-section h2 {
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.875rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-light);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label,
.field-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    color: var(--text);
    line-height: 1.4;
}

.required {
    color: #ef4444;
}

input[type="text"],
input[type="email"],
input[type="tel"] {
    width: 100%;
    min-height: var(--touch-min);
    padding: 0.75rem 1rem;
    font-size: 16px;
    font-family: inherit;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: #f8fafc;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    -webkit-appearance: none;
    appearance: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus {
    outline: none;
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.radio-group {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.625rem;
}

.radio-group-inline {
    grid-template-columns: 1fr;
}

.radio-card,
.radio-pill {
    position: relative;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.radio-card input,
.radio-pill input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.radio-content {
    display: block;
    min-height: var(--touch-min);
    padding: 0.875rem 1rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: #f8fafc;
    transition: all 0.2s ease;
}

.radio-content strong {
    display: block;
    font-size: 0.925rem;
}

.radio-content small {
    display: block;
    color: var(--text-muted);
    font-size: 0.78rem;
    margin-top: 0.15rem;
}

.radio-card input:checked + .radio-content,
.radio-pill input:checked + span {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 0 0 1px var(--primary);
}

.radio-card input:focus-visible + .radio-content,
.radio-pill input:focus-visible + span {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.radio-card:hover .radio-content,
.radio-pill:hover span {
    border-color: #93c5fd;
}

.radio-pill span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: var(--touch-min);
    text-align: center;
    padding: 0.75rem 0.875rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    background: #f8fafc;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.3;
    transition: all 0.2s ease;
    word-break: break-word;
}

.radio-card-sm .radio-content {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0.875rem;
}

.form-actions {
    margin-top: 0.25rem;
    position: sticky;
    bottom: 0;
    padding-top: 0.5rem;
    background: linear-gradient(to top, var(--card-bg) 70%, transparent);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--touch-min);
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.btn-primary {
    width: 100%;
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.success-card {
    text-align: center;
    max-width: 480px;
}

.success-icon {
    width: clamp(60px, 18vw, 72px);
    height: clamp(60px, 18vw, 72px);
    margin: 0 auto 1.25rem;
    background: #dcfce7;
    color: var(--success);
    font-size: clamp(1.5rem, 5vw, 2rem);
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.success-card h1 {
    font-size: clamp(1.35rem, 4.5vw, 1.75rem);
    margin-bottom: 0.75rem;
}

.success-card p {
    color: var(--text-muted);
    font-size: clamp(0.875rem, 2.5vw, 1rem);
    margin-bottom: 1.5rem;
    padding: 0 0.25rem;
}

.success-card .btn-primary {
    width: 100%;
    max-width: 280px;
}

/* Small phones (320px – 374px) */
@media (max-width: 374px) {
    :root {
        --page-padding: 0.75rem;
        --card-padding: 1rem;
        --radius: 12px;
    }

    .badge {
        font-size: 0.65rem;
        padding: 0.3rem 0.7rem;
    }

    .radio-pill span {
        font-size: 0.8125rem;
        padding: 0.65rem 0.5rem;
    }
}

/* Large phones & small tablets (480px+) */
@media (min-width: 480px) {
    :root {
        --page-padding: 1.25rem;
        --card-padding: 1.75rem;
    }

    .radio-group:not(.radio-group-inline) {
        grid-template-columns: 1fr 1fr;
    }

    .radio-group-inline {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-section {
        margin-bottom: 1.75rem;
    }
}

/* Tablets (600px+) */
@media (min-width: 600px) {
    :root {
        --card-padding: 2rem;
    }

    .form-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .form-grid .form-group {
        margin-bottom: 0;
    }

    .radio-group-inline {
        grid-template-columns: repeat(3, 1fr);
    }

    .form-actions {
        position: static;
        background: none;
        padding-top: 0;
    }
}

/* Tablets landscape & small laptops (768px+) */
@media (min-width: 768px) {
    :root {
        --page-padding: 2rem;
        --card-padding: 2.5rem;
    }

    .form-card {
        box-shadow: var(--shadow);
    }

    .form-header {
        margin-bottom: 2rem;
    }

    .form-section {
        margin-bottom: 2rem;
    }

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

    .alert {
        padding: 1rem 1.25rem;
        font-size: 0.9rem;
    }

    .btn-primary:hover {
        transform: translateY(-1px);
    }

    .success-card .btn-primary {
        width: auto;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .page-wrapper {
        padding: 2.5rem 2rem;
    }

    .form-card {
        max-width: 780px;
    }
}

/* Large desktop (1280px+) */
@media (min-width: 1280px) {
    .form-card {
        max-width: 820px;
    }
}

/* Phone landscape – compact vertical space */
@media (max-height: 500px) and (orientation: landscape) {
    .page-wrapper {
        align-items: flex-start;
        padding-top: 1rem;
        padding-bottom: 1rem;
    }

    .form-header {
        margin-bottom: 1rem;
    }

    .form-header h1 {
        font-size: 1.25rem;
    }

    .form-section {
        margin-bottom: 1rem;
    }

    .form-actions {
        position: static;
        background: none;
    }
}

/* Touch devices – disable hover lift */
@media (hover: none) and (pointer: coarse) {
    .btn-primary:hover {
        transform: none;
    }

    .radio-card:hover .radio-content,
    .radio-pill:hover span {
        border-color: var(--border);
    }

    .radio-card input:checked + .radio-content,
    .radio-pill input:checked + span {
        border-color: var(--primary);
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .btn-primary:hover,
    .btn-primary:active {
        transform: none;
    }
}