/* Trang dang ky moi: cung he thong thiet ke (dark futuristic) voi trang dang nhap (assets/dangnhap/dangnhap.css).
   Cac class dung chung giu nguyen tien to "dn-"; phan rieng cho dang ky (radio HSSV/GV, upload anh, captcha) dung tien to "dk-". */
:root {
    --dn-red: #eb0000;
    --dn-red-light: #ff4b4b;
    --dn-red-dark: #8f0000;
    --dn-blue: #4f9dff;
    --dn-white: #ffffff;

    --dn-navy-950: #06060d;
    --dn-navy-900: #0d0d1a;
    --dn-navy-800: #16161f;

    --dn-text: #f5f6fa;
    --dn-text-mute: rgba(245, 246, 250, 0.46);

    --dn-glass: rgba(255, 255, 255, 0.055);
    --dn-glass-strong: rgba(255, 255, 255, 0.09);
    --dn-border: rgba(255, 255, 255, 0.14);
    --dn-border-strong: rgba(255, 255, 255, 0.24);

    --dn-shadow-card: 0 30px 80px -28px rgba(0, 0, 0, 0.55), 0 0 60px -24px rgba(235, 0, 0, 0.28);
    --dn-shadow-soft: 0 16px 34px -18px rgba(0, 0, 0, 0.5);

    --dn-radius-lg: 24px;
    --dn-radius-sm: 10px;

    --dn-duration-fast: 150ms;
    --dn-duration-normal: 280ms;
    --dn-duration-slow: 700ms;
    --dn-ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--dn-text);
    background: var(--dn-navy-950);
}

.dn-wrap {
    position: relative;
    display: flex;
    min-height: 100vh;
    max-width: 1360px;
    margin: 0 auto;
}

/* ---------- Nen dung chung cho toan trang: grid + orbs ---------- */

.dn-side-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
    background:
        radial-gradient(80% 55% at 18% 8%, rgba(235, 0, 0, 0.2), transparent 55%),
        radial-gradient(70% 55% at 85% 92%, rgba(79, 157, 255, 0.14), transparent 55%),
        linear-gradient(165deg, var(--dn-navy-950), var(--dn-navy-900) 55%, var(--dn-navy-800));
}

.dn-grid {
    position: absolute;
    inset: -1px;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
    background-size: 42px 42px;
    -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 0%, transparent 80%);
    mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 0%, transparent 80%);
}

.dn-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    will-change: transform;
}

.dn-orb-1 {
    width: 420px;
    height: 420px;
    top: -100px;
    left: -80px;
    background: radial-gradient(circle, rgba(235, 0, 0, 0.5), transparent 72%);
    animation: dnOrbFloat1 16s var(--dn-ease-out-expo) infinite alternate;
}

.dn-orb-2 {
    width: 360px;
    height: 360px;
    bottom: -110px;
    right: -80px;
    background: radial-gradient(circle, rgba(79, 157, 255, 0.36), transparent 72%);
    animation: dnOrbFloat2 18s var(--dn-ease-out-expo) infinite alternate;
}

@keyframes dnOrbFloat1 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(40px, 50px) scale(1.12); }
}

@keyframes dnOrbFloat2 {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(-30px, -40px) scale(1.08); }
}

/* ---------- Ben trai: mascot + promo card ---------- */

.dn-side {
    position: relative;
    z-index: 1;
    flex: 0 0 44%;
    padding: 56px 32px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.dn-side::after {
    content: "";
    position: absolute;
    top: 14%;
    bottom: 14%;
    right: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--dn-border-strong) 50%, transparent);
}

.dn-side-inner {
    position: sticky;
    top: 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
    max-width: 480px;
}

.dn-side-illu {
    width: 100%;
    max-width: 280px;
    height: auto;
    filter: drop-shadow(0 24px 40px rgba(235, 0, 0, 0.35));
    animation: dnMascotFloat 6s ease-in-out infinite alternate;
}

@keyframes dnMascotFloat {
    0% { transform: translateY(0); }
    100% { transform: translateY(-14px); }
}

.dn-promo {
    background: var(--dn-glass-strong);
    border: 1px solid var(--dn-border-strong);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-radius: var(--dn-radius-lg);
    padding: 24px 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100%;
    box-shadow: var(--dn-shadow-card);
}

.dn-promo h2 {
    margin: 0;
    font-size: clamp(21px, 1.4vw + 16px, 28px);
    font-weight: 800;
    line-height: 1.3;
    text-align: center;
    letter-spacing: -0.01em;
    background: linear-gradient(120deg, #ffffff, #ffd9d9 60%, var(--dn-red-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.dn-promo ul {
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
}

.dn-promo li {
    position: relative;
    padding-left: 30px;
    font-size: 13px;
    font-weight: 500;
    line-height: 26px;
    color: var(--dn-text);
}

.dn-promo li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    top: 4px;
    width: 17px;
    height: 17px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--dn-red-light), var(--dn-red));
    color: var(--dn-white);
    font-size: 10px;
    font-weight: 700;
    box-shadow: 0 0 0 3px rgba(235, 0, 0, 0.14);
}

.dn-promo-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    width: 100%;
    max-width: 311px;
    min-height: 48px;
    margin-top: 8px;
    padding: 12px 17px;
    border-radius: 99px;
    background: linear-gradient(120deg, var(--dn-red-light), var(--dn-red) 60%, var(--dn-red-dark));
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: var(--dn-white);
    font-size: 15px;
    font-weight: 600;
    line-height: 24px;
    text-decoration: none;
    text-align: center;
    box-shadow: 0 14px 30px -10px rgba(235, 0, 0, 0.55);
    transition: transform var(--dn-duration-fast) var(--dn-ease-out-expo), box-shadow var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-promo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 36px -8px rgba(235, 0, 0, 0.65);
}

.dn-promo-btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
    transform: translateX(-120%);
    transition: transform var(--dn-duration-slow) var(--dn-ease-out-expo);
}

.dn-promo-btn:hover::after {
    transform: translateX(120%);
}

/* ---------- Ben phai: form dang ky ---------- */

.dn-main {
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 56px 20px 64px;
}

.dn-main-inner {
    width: 100%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    animation: dnCardIn var(--dn-duration-slow) var(--dn-ease-out-expo) both;
}

@keyframes dnCardIn {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- Nut quay lai trang chu ---------- */

.dn-home-link {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px 8px 13px;
    background: var(--dn-glass);
    border: 1px solid var(--dn-border);
    border-radius: 999px;
    color: var(--dn-text-mute);
    font-size: 13px;
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
    transition: color var(--dn-duration-fast) var(--dn-ease-out-expo),
        border-color var(--dn-duration-fast) var(--dn-ease-out-expo),
        background var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-home-link svg {
    width: 15px;
    height: 15px;
    transition: transform var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-home-link:hover {
    color: var(--dn-text);
    background: var(--dn-glass-strong);
    border-color: var(--dn-border-strong);
}

.dn-home-link:hover svg {
    transform: translateX(-3px);
}

.dn-home-link:focus-visible {
    outline: 2px solid var(--dn-red-light);
    outline-offset: 2px;
}

.dn-notice,
.dn-policy {
    background: var(--dn-glass);
    border: 1px solid var(--dn-border);
    border-radius: 8px;
    padding: 9px 12px;
    font-size: 12px;
    line-height: 18px;
    color: var(--dn-text);
}

.dn-card {
    position: relative;
    background: var(--dn-glass-strong);
    -webkit-backdrop-filter: blur(22px);
    backdrop-filter: blur(22px);
    border: 1px solid var(--dn-border);
    border-radius: var(--dn-radius-lg);
    padding: 32px 32px 28px;
    box-shadow: var(--dn-shadow-card);
    display: flex;
    flex-direction: column;
    gap: 22px;
    overflow: hidden;
}

.dn-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 12%;
    right: 12%;
    height: 3px;
    border-radius: 0 0 4px 4px;
    background: linear-gradient(90deg, transparent, var(--dn-red-light), var(--dn-blue), transparent);
}

.dn-title {
    margin: 0;
    font-size: clamp(26px, 1.4vw + 20px, 32px);
    font-weight: 800;
    line-height: 1.3;
    text-align: center;
    letter-spacing: -0.01em;
    background: linear-gradient(120deg, #ffffff, #ffd9d9 60%, var(--dn-red-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.dn-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.dn-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.dn-label {
    font-size: 13px;
    font-weight: 600;
    line-height: 21px;
    color: var(--dn-text);
}

.dn-label-required {
    color: var(--dn-red-light);
}

.dn-input-border {
    display: flex;
    align-items: center;
    min-height: 50px;
    padding: 9px 12px;
    border: 1.5px solid var(--dn-border);
    border-radius: var(--dn-radius-sm);
    background: rgba(255, 255, 255, 0.04);
    transition: border-color var(--dn-duration-fast) var(--dn-ease-out-expo), box-shadow var(--dn-duration-fast) var(--dn-ease-out-expo), background var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-input-border:focus-within {
    border-color: var(--dn-red-light);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: 0 0 0 4px rgba(235, 0, 0, 0.16);
}

.dn-input-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    margin-right: 10px;
    color: var(--dn-text-mute);
    transition: color var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-input-icon svg {
    width: 100%;
    height: 100%;
}

.dn-input-border:focus-within .dn-input-icon {
    color: var(--dn-red-light);
}

.dn-input {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
    font-family: inherit;
    color: var(--dn-text);
}

/* Autofill cua Chromium tu to nen sang + chu den (UA style, khong override truc tiep duoc)
   -> pha theme toi. Meo chuan: transition background cuc dai de tri hoan viec doi nen
   (giu nen transparent goc), -webkit-text-fill-color de giu mau chu trang. */
.dn-input:-webkit-autofill,
.dn-input:-webkit-autofill:hover,
.dn-input:-webkit-autofill:focus {
    -webkit-text-fill-color: var(--dn-text);
    caret-color: var(--dn-text);
    transition: background-color 9999999s ease-in-out 0s;
}

.dn-input::placeholder {
    color: var(--dn-text-mute);
}

.dn-input[readonly] {
    cursor: pointer;
}

.dn-select {
    flex: 1;
    min-width: 0;
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
    font-family: inherit;
    color: var(--dn-text);
    cursor: pointer;
}

.dn-select option {
    background: var(--dn-navy-900);
    color: var(--dn-text);
}

.dn-toggle-password {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    margin-left: 8px;
    border: none;
    border-radius: 999px;
    background: rgba(79, 157, 255, 0.22);
    color: var(--dn-text);
    cursor: pointer;
    transition: background var(--dn-duration-fast) var(--dn-ease-out-expo), transform var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-toggle-password:hover {
    background: rgba(79, 157, 255, 0.36);
}

.dn-toggle-password:active {
    transform: scale(0.92);
}

.dn-toggle-password svg {
    width: 12px;
    height: 12px;
    display: block;
}

.dn-field-error {
    color: var(--dn-red-light);
    font-size: 12px;
    min-height: 16px;
}

/* Khi CHUA co loi thi khong chiem cho (form bot thua khoang trong giua cac field);
   luc co loi moi hien dong do ra - form gian nhe, chap nhan duoc vi la trang thai loi. */
.dn-field-error:empty {
    display: none;
}

.dn-form-error {
    color: var(--dn-red-light);
    font-size: 13px;
    text-align: center;
}

.dn-form-error:empty {
    display: none;
}

.dn-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.dn-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 50px;
    padding: 12px 17px;
    border-radius: var(--dn-radius-sm);
    border: 1px solid transparent;
    font-size: 16px;
    font-weight: 600;
    line-height: 24px;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: transform var(--dn-duration-fast) var(--dn-ease-out-expo), box-shadow var(--dn-duration-fast) var(--dn-ease-out-expo), opacity var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-btn-primary {
    position: relative;
    overflow: hidden;
    background: linear-gradient(120deg, var(--dn-red-light), var(--dn-red) 60%, var(--dn-red-dark));
    border-color: transparent;
    color: var(--dn-white);
    box-shadow: 0 16px 32px -12px rgba(235, 0, 0, 0.6);
}

.dn-btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 20px 40px -10px rgba(235, 0, 0, 0.7);
}

.dn-btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

.dn-btn-primary::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.3) 50%, transparent 70%);
    transform: translateX(-120%);
    transition: transform var(--dn-duration-slow) var(--dn-ease-out-expo);
}

.dn-btn-primary:hover:not(:disabled)::after {
    transform: translateX(120%);
}

.dn-btn-primary:disabled {
    opacity: 0.6;
    cursor: default;
    transform: none;
}

.dn-divider {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.dn-divider::before,
.dn-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--dn-border);
}

.dn-divider span {
    font-size: 13px;
    line-height: 24px;
    color: var(--dn-text);
    white-space: nowrap;
}

.dn-social {
    display: flex;
    gap: 12px;
}

.dn-social-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 54px;
    min-width: 100px;
    border: 1.5px solid var(--dn-border);
    border-radius: var(--dn-radius-sm);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: var(--dn-shadow-soft);
    font-size: 14px;
    font-weight: 600;
    color: var(--dn-text);
    cursor: pointer;
    transition: transform var(--dn-duration-fast) var(--dn-ease-out-expo), box-shadow var(--dn-duration-fast) var(--dn-ease-out-expo), border-color var(--dn-duration-fast) var(--dn-ease-out-expo), background var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-social-btn:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 36px -16px rgba(0, 0, 0, 0.5);
}

#dn-google-btn:hover {
    border-color: rgba(66, 133, 244, 0.55);
}

#dn-zalo-btn:hover {
    border-color: rgba(79, 157, 255, 0.55);
}

.dn-social-icon {
    display: block;
}

.dn-register {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-size: 14px;
    line-height: 24px;
    color: var(--dn-text);
    flex-wrap: wrap;
}

.dn-register a {
    color: var(--dn-red-light);
    font-weight: 600;
    text-decoration: none;
}

.dn-register a:hover {
    text-decoration: underline;
}

.dn-policy a {
    color: var(--dn-red-light);
    text-decoration: none;
}

.dn-policy a:hover {
    text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--dn-red-light);
    outline-offset: 2px;
}

/* Input/select da co vien + glow rieng qua .dn-input-border:focus-within (xem tren) -
   khong ap dung them outline o day de tranh vien do bi chong/day. Rieng radio (khong nam
   trong .dn-input-border) van can outline de giu tin hieu focus cho ban phim. */
.dk-radio-option input[type="radio"]:focus-visible {
    outline: 2px solid var(--dn-red-light);
    outline-offset: 3px;
}

/* ---------- Rieng cho dang ky: uu dai HSSV/GV, radio, upload anh, captcha ---------- */

.dk-promo-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 0;
    padding: 11px 16px;
    border-radius: var(--dn-radius-sm);
    background: linear-gradient(120deg, rgba(255, 75, 75, 0.16), rgba(79, 157, 255, 0.08));
    border: 1px solid rgba(255, 75, 75, 0.3);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
    font-size: 12.5px;
    font-weight: 600;
    line-height: 18px;
    text-align: center;
    color: var(--dn-text);
}

.dk-promo-note-icon {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    color: var(--dn-red-light);
}

.dk-radio-group {
    display: flex;
    gap: 24px;
}

.dk-radio-option {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--dn-text);
}

.dk-radio-option input[type="radio"] {
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--dn-red-light);
    cursor: pointer;
}

.dk-subform {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-top: 4px;
    animation: dnCardIn var(--dn-duration-normal) var(--dn-ease-out-expo) both;
}

.dk-subform[hidden] {
    display: none;
}

/* TAM AN theo yeu cau (khong xoa markup - de bat lai de dang, chi doi/xoa 3 rule nay): an het phan
   "uu dai HSSV/GV" (dong thong bao + 2 nut radio + 2 form phu) khoi form dang ky. Dat SAU 3 rule
   goc o tren (cung 1 muc specificity, .dk-promo-note/.dk-radio-group/.dk-subform deu la 1 class) de
   thang duoc do dung sau trong cascade - dat truoc se bi 3 rule goc (display:flex) de nguoc lai. */
.dk-promo-note,
.dk-radio-group,
.dk-subform {
    display: none;
}

.dk-upload-row {
    display: flex;
    gap: 16px;
}

.dk-upload {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 77px;
    padding: 9px;
    border: 1.5px dashed var(--dn-border-strong);
    border-radius: var(--dn-radius-sm);
    background: rgba(79, 157, 255, 0.06);
    color: var(--dn-text-mute);
    cursor: pointer;
    text-align: center;
    transition: border-color var(--dn-duration-fast) var(--dn-ease-out-expo), background var(--dn-duration-fast) var(--dn-ease-out-expo), color var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dk-upload:hover {
    border-color: var(--dn-blue);
    background: rgba(79, 157, 255, 0.12);
}

.dk-upload.dk-upload-filled {
    border-style: solid;
    border-color: var(--dn-red-light);
    color: var(--dn-text);
    background: rgba(235, 0, 0, 0.08);
}

.dk-upload svg {
    width: 22px;
    height: 22px;
}

.dk-upload span {
    font-size: 12px;
    line-height: 18px;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dk-upload input[type="file"] {
    display: none;
}

.dk-captcha-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.dk-captcha-row .dn-field {
    flex: 1;
}

.dk-captcha-code {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 50px;
    /* Can bang voi .dn-input-border ben trai (khong phai dinh field): label (line-height 21px) +
       gap cua .dn-field (6px) = 27px. .dk-captcha-code khong co label nen phai tu bu khoang nay -
       neu dung align-items:flex-end nhu truoc, div .dn-field-error (them sau, luon chiem cho de
       hien loi) se lam field ben trai cao hon, keo captcha-code lech len. */
    margin-top: 27px;
    /* Danh cho cho dong dem nguoc "Ma tu doi sau Ns" (position absolute duoi khung, khong
       chiem cho trong luong) - truoc dua vao min-height cua .dn-field-error + gap 20px, gio
       error trong da an (:empty) va gap con 10px nen phai chua cho ro rang o day. */
    margin-bottom: 20px;
    padding: 0 14px;
    border-radius: var(--dn-radius-sm);
    background: var(--dn-navy-950);
    border: 1px solid var(--dn-border-strong);
    flex-shrink: 0;
    position: relative;
}

.dk-captcha-countdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 4px 0 0;
    font-size: 11px;
    line-height: 1.4;
    color: var(--dn-text-mute);
    text-align: center;
    white-space: nowrap;
}

/* Anh captcha that (GD, 150x50px goc - xem Register::_render_captcha_image()) thay vi chu dap an
   truoc day (da bo o backend vi lo dap an cho bot doc duoc) - gio la <img>, khong con la text. */
.dk-captcha-value {
    height: 38px;
    width: auto;
    border-radius: 4px;
    background: var(--dn-white);
    user-select: none;
}

.dk-captcha-refresh {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    border: none;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--dn-text-mute);
    cursor: pointer;
    transition: background var(--dn-duration-fast) var(--dn-ease-out-expo), color var(--dn-duration-fast) var(--dn-ease-out-expo), transform var(--dn-duration-normal) var(--dn-ease-out-expo);
}

.dk-captcha-refresh:hover {
    background: rgba(79, 157, 255, 0.25);
    color: var(--dn-text);
}

.dk-captcha-refresh.dk-spin {
    transform: rotate(180deg);
}

.dk-captcha-refresh svg {
    width: 13px;
    height: 13px;
}

/* ---------- Modal "Xac thuc OTP" - port tu assets/new/dangnhap/dangnhap.css (dung chung token
   --dn-*), rieng file nay vi dangky.css truoc gio khong co modal nao. ---------- */

.dn-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(3, 3, 8, 0.72);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
    z-index: 1000;
}

.dn-modal-overlay[hidden] {
    display: none;
}

.dn-modal {
    position: relative;
    width: 100%;
    max-width: 400px;
    background: linear-gradient(165deg, var(--dn-navy-900), var(--dn-navy-800));
    border: 1px solid var(--dn-border);
    border-radius: var(--dn-radius-lg);
    padding: 32px 24px 24px;
    box-shadow: var(--dn-shadow-card);
    overflow: hidden;
    animation: dnModalIn var(--dn-duration-normal) var(--dn-ease-out-expo) both;
}

.dn-modal::before {
    content: "";
    position: absolute;
    top: 0;
    left: 12%;
    right: 12%;
    height: 3px;
    border-radius: 0 0 4px 4px;
    background: linear-gradient(90deg, transparent, var(--dn-red-light), var(--dn-blue), transparent);
}

@keyframes dnModalIn {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(8px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.dn-modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 999px;
    background: var(--dn-glass);
    font-size: 20px;
    line-height: 1;
    color: var(--dn-text);
    cursor: pointer;
    transition: background var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-modal-close:hover {
    background: var(--dn-glass-strong);
}

.dn-modal-title {
    margin: 0 0 8px;
    font-size: 20px;
    font-weight: 800;
    text-align: center;
    background: linear-gradient(120deg, #ffffff, #ffd9d9 60%, var(--dn-red-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.dn-modal-desc {
    margin: 0 0 20px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--dn-text);
    text-align: center;
}

#dk-otp-confirm-btn {
    margin-top: 20px;
}

.dn-otp-resend-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.dn-otp-resend-btn {
    flex-shrink: 0;
    padding: 2px 4px;
    background: transparent;
    border: none;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--dn-red-light);
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color var(--dn-duration-fast) var(--dn-ease-out-expo), opacity var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dn-otp-resend-btn:hover {
    color: var(--dn-white);
}

.dn-otp-resend-btn:disabled {
    color: var(--dn-text-mute);
    opacity: 0.6;
    cursor: default;
    text-decoration: none;
}

.dn-otp-expiry {
    margin: 4px 0 0;
    font-size: 12px;
    line-height: 1.5;
    color: var(--dn-text-mute);
    text-align: center;
}

.dn-otp-expiry--expired {
    color: var(--dn-red-light);
}

/* ---------- Datepicker tuy chinh (thay picker mac dinh cua trinh duyet, dong bo theme) ---------- */

.dk-dp-popover {
    position: fixed;
    z-index: 2000;
    width: 300px;
    max-width: calc(100vw - 24px);
    padding: 16px;
    border-radius: var(--dn-radius-sm);
    background: linear-gradient(165deg, var(--dn-navy-900), var(--dn-navy-800));
    border: 1px solid var(--dn-border-strong);
    box-shadow: var(--dn-shadow-card);
    animation: dnCardIn var(--dn-duration-normal) var(--dn-ease-out-expo) both;
}

.dn-google-popover {
    width: auto;
    padding: 8px;
}

.dk-dp-header {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.dk-dp-dropdown {
    position: relative;
    flex: 1;
    min-width: 0;
}

.dk-dp-dropdown-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    width: 100%;
    padding: 6px 8px;
    border-radius: 8px;
    border: 1px solid var(--dn-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--dn-text);
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: border-color var(--dn-duration-fast) var(--dn-ease-out-expo), background var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dk-dp-dropdown-btn:hover {
    background: rgba(255, 255, 255, 0.09);
}

.dk-dp-dropdown-btn svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    color: var(--dn-text-mute);
    transition: transform var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dk-dp-dropdown--open .dk-dp-dropdown-btn {
    border-color: var(--dn-red-light);
}

.dk-dp-dropdown--open .dk-dp-dropdown-btn svg {
    transform: rotate(180deg);
    color: var(--dn-red-light);
}

.dk-dp-listbox {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    width: 190px;
    z-index: 10;
    padding: 6px;
    border-radius: 10px;
    background: linear-gradient(165deg, var(--dn-navy-900), var(--dn-navy-800));
    border: 1px solid var(--dn-border-strong);
    box-shadow: var(--dn-shadow-card);
}

/* Dropdown Nam la cot thu 2 trong header - neo popup tu canh phai de khong trai dai qua
   mep phai cua popover lich (thay vi cung neo trai nhu dropdown Thang). */
[data-dp-dropdown="year"] .dk-dp-listbox {
    left: auto;
    right: 0;
}

.dk-dp-listbox[hidden] {
    display: none;
}

.dk-dp-search {
    display: block;
    width: 100%;
    margin-bottom: 6px;
    padding: 7px 9px;
    border-radius: 8px;
    border: 1px solid var(--dn-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--dn-text);
    font-size: 13px;
    font-family: inherit;
    outline: none;
}

.dk-dp-search:focus {
    border-color: var(--dn-red-light);
}

.dk-dp-search::placeholder {
    color: var(--dn-text-mute);
}

.dk-dp-listbox-months,
.dk-dp-listbox-years {
    max-height: 200px;
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.dk-dp-listbox-months::-webkit-scrollbar,
.dk-dp-listbox-years::-webkit-scrollbar {
    display: none;
}

.dk-dp-listbox-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 8px 10px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--dn-text);
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    text-align: left;
    cursor: pointer;
}

.dk-dp-listbox-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.dk-dp-listbox-item svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}

.dk-dp-listbox-item--active,
.dk-dp-listbox-item--active:hover {
    background: linear-gradient(135deg, var(--dn-red-light), var(--dn-red));
    color: var(--dn-white);
    font-weight: 700;
}

.dk-dp-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    margin-bottom: 4px;
}

.dk-dp-weekdays span {
    text-align: center;
    font-size: 11px;
    font-weight: 700;
    color: var(--dn-text-mute);
    text-transform: uppercase;
}

.dk-dp-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.dk-dp-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--dn-text);
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: background var(--dn-duration-fast) var(--dn-ease-out-expo), color var(--dn-duration-fast) var(--dn-ease-out-expo);
}

.dk-dp-day:hover {
    background: rgba(255, 255, 255, 0.1);
}

.dk-dp-day--muted {
    color: var(--dn-text-mute);
}

.dk-dp-day--today {
    box-shadow: inset 0 0 0 1.5px var(--dn-red-light);
}

.dk-dp-day--selected,
.dk-dp-day--selected:hover {
    background: linear-gradient(135deg, var(--dn-red-light), var(--dn-red));
    color: var(--dn-white);
    font-weight: 700;
}

.dk-dp-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--dn-border);
}

.dk-dp-link {
    background: none;
    border: none;
    padding: 4px;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    color: var(--dn-blue);
    cursor: pointer;
}

.dk-dp-link:hover {
    text-decoration: underline;
}

/* ---------- Responsive: 1180 / 992 / 640 / 400 ---------- */

@media (max-width: 1180px) {
    .dn-side {
        flex-basis: 42%;
    }

    .dn-card {
        padding: 28px 26px 24px;
    }
}

/* Mobile/tablet: AN han cot trai (mascot + promo "UU DAI NGAP TRAN"), chi hien form -
   nguoi dung mobile vao trang nay de dang nhap/dang ky, khong cuon qua khoi quang cao. */
@media (max-width: 992px) {
    .dn-wrap {
        flex-direction: column;
    }

    .dn-side {
        display: none;
    }

    .dn-main {
        padding: 32px 20px 40px;
    }
}

@media (max-width: 640px) {
    .dn-orb-1,
    .dn-orb-2 {
        width: 220px;
        height: 220px;
        filter: blur(50px);
    }

    .dn-card {
        padding: 24px 18px 20px;
        border-radius: 18px;
    }

    .dn-social-btn {
        min-width: 0;
    }

    .dk-upload-row {
        gap: 10px;
    }

    .dk-captcha-row {
        flex-wrap: wrap;
    }

    .dk-captcha-code {
        width: 100%;
        justify-content: center;
        /* Khi wrap xuong dong rieng thi khong con label ben canh de can - bo 27px thua */
        margin-top: 0;
    }
}

@media (max-width: 400px) {
    .dn-promo li {
        font-size: 12px;
    }

    .dn-social {
        gap: 8px;
    }

    .dk-radio-group {
        gap: 16px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .dn-orb,
    .dn-side-illu,
    .dn-main-inner,
    .dn-btn-primary::after,
    .dn-promo-btn::after,
    .dk-subform,
    .dk-captcha-refresh,
    .dk-dp-popover {
        animation: none !important;
        transition: none !important;
    }
}