:root {
    --bg: #fff8f0;
    --card: #ffffff;
    --text: #273043;
    --muted: #64748b;
    --border: #eaeaea;
    --primary: #e67e22;
    --primary-600: #d96f13;
    --primary-soft: #fff3e8;
    --danger: #c0392b;
    --success: #16a34a;
    --focus: #1a73e8;
    --ring: 0 0 0 3px rgba(26, 115, 232, .18);
    --shadow: 0 10px 28px rgba(2, 6, 23, .08);
}

* {
    box-sizing: border-box
}

html {
    font-size: 16px
}

html,
body {
    height: 100%
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans Thai", sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, #fff8f0, #f7fbff);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

form {
    width: min(760px, 92%);
    margin: 28px auto 18px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 26px 20px;
    box-shadow: var(--shadow);
    backdrop-filter: saturate(1.1);
}

h2 {
    margin: 0 0 14px;
    font-size: 24px;
    color: var(--primary);
    letter-spacing: .2px;
}

small {
    color: var(--muted)
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 12px 0;
}

.form-group.full-width {
    grid-column: 1/-1
}

@media (min-width: 720px) {
    form {
        padding: 30px 30px 26px
    }

    form>.form-group:not(.full-width) {
        display: grid;
        grid-template-columns: 230px 1fr;
        align-items: center;
        gap: 14px;
    }

    form>.form-group.full-width {
        display: grid;
        grid-template-columns: 230px 1fr;
        gap: 14px;
    }

    .form-group>label {
        margin: 0
    }
}

.form-group>label.required::after {
    content: " *";
    color: var(--danger);
    font-weight: 700;
}
input[type="text"],
input[type="email"],
input[type="password"],
select,
textarea {
    width: 100%;
    padding: 12px 12px;
    border: 1px solid #dcdcdc;
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    font-size: 15.5px;
    transition: border-color .15s ease, box-shadow .15s ease, background .15s ease, transform .02s ease;
}

input::placeholder {
    color: #9aa6b2
}

select[multiple] {
    min-height: 148px;
    padding: 8px;
    scrollbar-width: thin;
    scrollbar-color: #cfd8e3 transparent;
}

select[multiple]::-webkit-scrollbar {
    width: 10px
}

select[multiple]::-webkit-scrollbar-track {
    background: transparent
}

select[multiple]::-webkit-scrollbar-thumb {
    background: #cfd8e3;
    border-radius: 8px
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--focus);
    box-shadow: var(--ring);
}

input[disabled],
select[disabled],
textarea[disabled] {
    background: #f7f7f7;
    color: #9e9e9e;
    cursor: not-allowed;
}

input:required:invalid,
select:required:invalid,
textarea:required:invalid {
    border-color: #f59e0b44;
}

input:required:valid,
select:required:valid,
textarea:required:valid {
    border-color: #22c55e55;
}

.tip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-600);
    font-weight: 700;
    margin-left: 6px;
    border: 1px solid #ffd7bf;
    cursor: help;
    transform: translateY(-1px);
}

label .tip:hover {
    filter: brightness(.98)
}

.error {
    background: #ffecec;
    border: 1px solid #ffd2d2;
    color: var(--danger);
    padding: 10px 12px;
    border-radius: 12px;
}

.success {
    background: #ecfdf5;
    border: 1px solid #bbf7d0;
    color: var(--success);
    padding: 10px 12px;
    border-radius: 12px;
}

button,
.button-group button,
.actions .btn {
    appearance: none;
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    font-weight: 700;
    cursor: pointer;
    transition: filter .15s ease, transform .04s ease, box-shadow .15s ease;
    box-shadow: 0 6px 16px rgba(0, 0, 0, .06);
}

button[type="submit"],
.actions .btn {
    background: var(--primary);
    color: #fff;
}

.actions .btn.secondary {
    background: #9e9e9e;
    color: #fff;
}

button:hover,
.actions .btn:hover {
    filter: brightness(.97)
}

button:active,
.actions .btn:active {
    transform: translateY(1px)
}

.button-group {
    width: min(760px, 92%);
    margin: 10px auto 34px;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.button-group button {
    background: var(--primary-soft);
    color: var(--primary-600);
    border: 1px solid #ffd7bf;
}

.button-group button:hover {
    filter: brightness(.985)
}

.form-group small {
    display: block;
    margin-top: 6px;
    font-size: 12.5px;
}

.sr-only {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

button[aria-busy="true"] {
    position: relative;
    pointer-events: none;
    filter: brightness(.92);
}

button[aria-busy="true"]::after {
    content: "";
    position: absolute;
    right: 12px;
    top: 50%;
    width: 16px;
    height: 16px;
    margin-top: -8px;
    border: 2px solid #fff;
    border-left-color: transparent;
    border-radius: 50%;
    animation: spin .6s linear infinite;
}

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

@media (max-width: 480px) {
    form {
        margin-top: 18px
    }

    h2 {
        font-size: 21px
    }

    .button-group {
        justify-content: center
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1115;
        --card: #141820;
        --text: #e8e8e8;
        --muted: #9fb0c7;
        --border: #1f2530;
        --primary: #e67e22;
        --primary-600: #ffb169;
        --primary-soft: #2a211b;
        --focus: #60a5fa;
        --ring: 0 0 0 3px rgba(96, 165, 250, .22);
        --shadow: 0 16px 36px rgba(0, 0, 0, .5);
    }

    input,
    select,
    textarea {
        background: #0f131b;
        border-color: #273142;
        color: #e8e8e8;
    }

    input::placeholder {
        color: #8ea1bd
    }

    .error {
        background: #2a1110;
        border-color: #5a2a28
    }

    .success {
        background: #082b1a;
        border-color: #14532d
    }

    .button-group button {
        border-color: #3a2a1b
    }
}