/* ============================================================
   Nest Moments UX Styles
   Form validation, loading states, accessibility
   ============================================================ */

/* ---- Form Input States ---- */

input[type="text"],
input[type="email"],
input[type="tel"],
textarea,
select {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
textarea:focus,
select:focus {
    border-color: var(--color-black);
    outline: none;
}

/* Validation states */
input.is-invalid,
textarea.is-invalid,
select.is-invalid {
    border-color: #dc3545 !important;
    background-color: #fff5f5;
}

input.is-invalid:focus,
textarea.is-invalid:focus,
select.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

input.is-valid,
textarea.is-valid,
select.is-valid {
    border-color: #28a745 !important;
    background-color: #f5fff5;
}

input.is-valid:focus,
textarea.is-valid:focus,
select.is-valid:focus {
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

/* ---- Button States ---- */

button,
input[type="submit"],
input[type="button"],
.button,
.btn {
    position: relative;
    transition: all 0.2s ease;
}

button:disabled,
input[type="submit"]:disabled,
input[type="button"]:disabled,
.button:disabled,
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading state */
button.is-loading,
input[type="submit"].is-loading,
input[type="button"].is-loading,
.button.is-loading,
.btn.is-loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

button.is-loading::after,
input[type="submit"].is-loading::after,
input[type="button"].is-loading::after,
.button.is-loading::after,
.btn.is-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-top: -8px;
    margin-left: -8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ---- Checkboxes & Radio Buttons ---- */

input[type="checkbox"],
input[type="radio"] {
    cursor: pointer;
    margin-right: 0.5rem;
    transition: all 0.2s ease;
}

input[type="checkbox"]:focus,
input[type="radio"]:focus {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

input[type="checkbox"].is-invalid,
input[type="radio"].is-invalid {
    outline-color: #dc3545;
}

/* ---- Form Groups ---- */

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-black);
}

.form-group.has-error {
    color: #dc3545;
}

.form-group.has-error input,
.form-group.has-error textarea,
.form-group.has-error select {
    border-color: #dc3545;
}

/* ---- Help Text ---- */

.form-text,
.form-help,
.help-text {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--color-muted);
}

.form-group.has-error .form-text,
.form-group.has-error .form-help,
.form-group.has-error .help-text {
    color: #dc3545;
}

/* ---- Input Groups ---- */

.input-group {
    display: flex;
    align-items: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.input-group input {
    flex: 1;
    border: none;
    padding: 0.75rem 1rem;
}

.input-group button,
.input-group .button {
    margin: 0;
    border-radius: 0;
}

/* ---- Accessibility ---- */

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-black);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    z-index: 100;
}

.skip-to-main:focus {
    top: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--color-black);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--color-red);
    outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    @keyframes spin {
        to {
            transform: rotate(360deg);
        }
    }
}

/* ---- Mobile Responsiveness ---- */

@media (max-width: 640px) {
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    textarea,
    select {
        font-size: 16px; /* Prevent zoom on iOS */
    }

    button,
    .button,
    .btn {
        min-height: 44px; /* Touch target minimum */
    }

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

    .form-group label {
        margin-bottom: 0.75rem;
    }
}

/* ---- Loading Skeleton (optional) ---- */

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-button {
    height: 44px;
    min-width: 120px;
    border-radius: var(--radius-sm);
}