/* =========================================================
   Trang đăng nhập Sinh viên / Giảng viên - QLDT UTE
   ========================================================= */
:root {
    --ute-primary: #0a5cff;
    --ute-primary-2: #1aa8ff;
    --ute-cyan: #3fd3ff;
    --ute-navy: #061f63;
    --ute-navy-2: #0a3aa8;
    --ute-ink: #0b1b3f;
    --ute-muted: #5f6f8f;
    --ute-line: #d7deeb;
    --ute-field: #ffffff;
    --ute-tab-bg: #f3f6fb;
    --ute-danger: #d93a3a;
    --ute-page: #eaf2fb;
    --radius-card: 28px;
    --radius: 10px;
}

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

html, body { height: 100%; }

body.ute-login {
    margin: 0;
    font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--ute-ink);
    background: radial-gradient(1200px 600px at 10% 0%, #f6faff 0%, transparent 60%), var(--ute-page);
    -webkit-font-smoothing: antialiased;
}

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

/* ---------- Khung ---------- */
.login-shell {
    height: 100vh;
    height: 100dvh;
    display: flex;
}

.login-card {
    position: relative;
    width: 100%;
    height: 100%;
    background: #fff;
    overflow: hidden;
    display: flex;
}

/* ---------- Cột form ---------- */
.login-form-col {
    position: relative;
    z-index: 2;
    width: 42%;
    height: 100%;
    padding: clamp(20px, 4.5vh, 52px) 36px clamp(16px, 3vh, 36px) clamp(40px, 5vw, 110px);
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* chỉ cuộn trong cột form khi màn hình quá thấp */
    scrollbar-width: thin;
}

.brand { display: flex; align-items: center; }

/* Logo ngang dùng chung toàn hệ thống (wwwroot/img/logo.png) */
.brand__logo-full {
    display: block;
    width: auto;
    max-width: 100%;
    height: clamp(64px, 10.5vh, 112px);
    object-fit: contain;
    object-position: left center;
}

/* margin-top:auto + footer margin-top:auto -> khối form nằm giữa theo chiều dọc */
.login-heading { margin: auto 0 clamp(14px, 2.6vh, 28px); padding-top: clamp(18px, 4vh, 40px); max-width: 580px; text-align: center; }

.eyebrow {
    margin: 0 0 10px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--ute-primary);
}

.login-heading h1 {
    margin: 0;
    font-size: clamp(34px, 5.4vh, 52px);
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -1px;
    color: #071537;
}

#loginForm { max-width: 580px; }

/* ---------- Tabs ---------- */
.role-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.role-tab { position: relative; cursor: pointer; }

.role-tab input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.role-tab span {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    height: clamp(48px, 6.4vh, 64px);
    border-radius: var(--radius);
    border: 1px solid var(--ute-line);
    background: var(--ute-tab-bg);
    color: #1d2b4f;
    font-size: 19px;
    font-weight: 500;
    transition: background .2s, color .2s, box-shadow .2s, border-color .2s;
}

.role-tab span i { font-size: 22px; color: var(--ute-primary); transition: color .2s; }

.role-tab:hover span { border-color: #b7c6e4; }

.role-tab input:checked + span {
    background: linear-gradient(90deg, var(--ute-primary), #1b7bff);
    border-color: transparent;
    color: #fff;
    font-weight: 600;
    box-shadow: 0 10px 22px -10px rgba(10, 92, 255, .7);
}

.role-tab input:checked + span i { color: #fff; }

.role-tab input:focus-visible + span { outline: 3px solid rgba(10, 92, 255, .35); outline-offset: 2px; }

.role-hint {
    margin: clamp(12px, 2.2vh, 22px) 0 clamp(12px, 2.4vh, 24px);
    color: var(--ute-muted);
    font-size: 17px;
}

/* ---------- Thông báo lỗi ---------- */
.form-alert {
    margin-bottom: 18px;
    padding: 12px 16px;
    border-radius: var(--radius);
    background: #fff2f2;
    border: 1px solid #f5c6c6;
    color: var(--ute-danger);
    font-size: 15px;
}

.form-alert ul { margin: 0; padding-left: 18px; }
.form-alert.validation-summary-valid { display: none; }

.field-error {
    display: block;
    min-height: 0;
    margin: -14px 0 14px 4px;
    font-size: 13.5px;
    color: var(--ute-danger);
}

.field-error:empty { display: none; }

/* ---------- Ô nhập ---------- */
.field {
    display: flex;
    align-items: stretch;
    height: clamp(48px, 6.2vh, 62px);
    margin-bottom: clamp(12px, 2.2vh, 22px);
    border: 1px solid var(--ute-line);
    border-radius: var(--radius);
    background: var(--ute-field);
    transition: border-color .2s, box-shadow .2s;
}

.field:focus-within {
    border-color: var(--ute-primary);
    box-shadow: 0 0 0 4px rgba(10, 92, 255, .12);
}

.was-validated .field:has(.field__input:invalid) { border-color: var(--ute-danger); }

.field__icon {
    width: 62px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-right: 1px solid var(--ute-line);
    color: #4a5878;
    font-size: 20px;
    flex-shrink: 0;
}

.field__input {
    flex: 1;
    min-width: 0;
    border: 0;
    outline: 0;
    padding: 0 18px;
    font: inherit;
    font-size: 17px;
    color: var(--ute-ink);
    background: transparent;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.field__input::placeholder { color: #8a95ad; }

.field__toggle {
    width: 58px;
    border: 0;
    background: transparent;
    color: #4a5878;
    font-size: 19px;
    cursor: pointer;
}

.field__toggle:hover { color: var(--ute-primary); }

/* ---------- Ghi nhớ / Quên MK ---------- */
.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 4px 0 clamp(16px, 3vh, 30px);
}

.check {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 17px;
    color: #1d2b4f;
    cursor: pointer;
}

.check input {
    width: 20px;
    height: 20px;
    accent-color: var(--ute-primary);
    cursor: pointer;
}

.link-btn {
    border: 0;
    background: none;
    padding: 0;
    font: inherit;
    font-size: 17px;
    color: var(--ute-primary);
    cursor: pointer;
    text-decoration: none;
}

.link-btn:hover { text-decoration: underline; }

/* ---------- Nút đăng nhập ---------- */
.btn-login {
    position: relative;
    width: 100%;
    height: clamp(52px, 6.8vh, 68px);
    border: 0;
    border-radius: var(--radius);
    background: linear-gradient(90deg, #0a55f5 0%, #1173ff 55%, #26b4ff 100%);
    color: #fff;
    font: inherit;
    font-size: 21px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    box-shadow: 0 16px 30px -14px rgba(10, 92, 255, .8);
    transition: transform .15s, box-shadow .2s, filter .2s;
}

.btn-login:hover { filter: brightness(1.05); box-shadow: 0 18px 34px -12px rgba(10, 92, 255, .85); }
.btn-login:active { transform: translateY(1px); }
.btn-login:focus-visible { outline: 3px solid rgba(10, 92, 255, .35); outline-offset: 3px; }

.btn-login__icon {
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 22px;
}

.btn-login__spinner {
    display: none;
    position: absolute;
    right: 30px;
    top: 50%;
    width: 22px;
    height: 22px;
    margin-top: -11px;
    border: 3px solid rgba(255, 255, 255, .35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: ute-spin .8s linear infinite;
}

.btn-login.is-loading { cursor: progress; filter: saturate(.85); }
.btn-login.is-loading .btn-login__icon { display: none; }
.btn-login.is-loading .btn-login__spinner { display: block; }

.btn-login--sm { height: 46px; font-size: 15px; letter-spacing: 1px; }

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

.login-footer {
    margin-top: auto;
    padding-top: clamp(16px, 3vh, 40px);
    font-size: 14.5px;
    line-height: 1.7;
    color: #6a7690;
}

/* ---------- Cột hình ảnh ---------- */
.login-visual,
.login-visual-edge {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 15% 100%);
}

.login-visual-edge {
    width: 59%;
    background: linear-gradient(180deg, #2a6cff, #1b4fd6);
    z-index: 1;
}

.login-visual {
    width: 58.4%;
    z-index: 1;
    color: #fff;
    overflow: hidden;
    /* Ảnh: đặt ảnh toà nhà UTE (đã nén, ~1600px) tại wwwroot/img/login/ute-campus.jpg; lớp dưới là ảnh dự phòng */
    background:
        linear-gradient(180deg, rgba(4, 22, 82, .93) 0%, rgba(6, 34, 120, .72) 38%, rgba(6, 36, 128, .55) 62%, rgba(4, 20, 80, .88) 100%),
        url("../../img/login/ute-campus.jpg") center 65% / cover no-repeat,
        url("../../img/bg_login.png") center 65% / cover no-repeat,
        var(--ute-navy);
}

.visual__circle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.visual__circle--top {
    width: 520px;
    height: 520px;
    top: -280px;
    right: -120px;
    background: radial-gradient(circle at 35% 70%, rgba(40, 140, 255, .55), rgba(10, 80, 220, .25) 60%, transparent 72%);
    border: 1px solid rgba(120, 190, 255, .35);
}

.visual__circle--bottom {
    width: 520px;
    height: 520px;
    bottom: -330px;
    left: 3%;
    background: radial-gradient(circle at 50% 30%, rgba(30, 120, 255, .7), rgba(8, 60, 200, .4) 55%, transparent 72%);
    border-top: 1px solid rgba(120, 190, 255, .45);
}

.visual__values {
    position: absolute;
    top: 72px;
    right: 64px;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 15px;
    line-height: 1.75;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(190, 220, 255, .85);
}

.visual__values::after {
    content: "";
    display: block;
    width: 52px;
    height: 1px;
    margin-top: 16px;
    background: rgba(190, 220, 255, .7);
}

.visual__content {
    position: absolute;
    top: 22%;
    left: 19%;
    right: 12%;
}

.visual__eyebrow {
    margin: 0 0 18px;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--ute-cyan);
}

.visual__title {
    margin: 0 0 30px;
    font-family: "Playfair Display", Georgia, serif;
    font-weight: 500;
    font-size: clamp(44px, min(5.4vw, 9vh), 84px);
    line-height: 1.02;
    color: #fff;
}

.visual__title em {
    font-style: italic;
    color: var(--ute-cyan);
}

.visual__desc {
    max-width: 400px;
    margin: 0;
    font-size: 17px;
    line-height: 1.75;
    color: rgba(235, 243, 255, .92);
    transition: opacity .25s;
}

.visual__desc.is-fading { opacity: 0; }

.visual__dots-grid {
    position: absolute;
    left: 17%;
    bottom: 46px;
    width: 104px;
    height: 104px;
    background-image: radial-gradient(rgba(80, 160, 255, .9) 2.2px, transparent 2.6px);
    background-size: 22px 22px;
}

.visual__script {
    position: absolute;
    right: 70px;
    bottom: clamp(90px, 14vh, 140px);
    font-family: "Dancing Script", cursive;
    font-size: clamp(32px, 5vh, 50px);
    line-height: 1.05;
    color: rgba(150, 220, 255, .95);
    transform: rotate(-14deg);
}

.visual__script span { display: inline-block; margin-left: 56px; }

.visual__script::after {
    content: "";
    position: absolute;
    left: 30px;
    right: -10px;
    bottom: -22px;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(150, 220, 255, .9));
    transform: rotate(-6deg);
}

.visual__pager {
    position: absolute;
    right: 70px;
    bottom: 50px;
    display: flex;
    gap: 12px;
}

.visual__pager button {
    width: 11px;
    height: 11px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: #2f6bff;
    cursor: pointer;
    transition: background .2s, transform .2s;
}

.visual__pager button.is-active { background: var(--ute-cyan); transform: scale(1.1); }

/* ---------- Dialog quên mật khẩu ---------- */
.forgot-dialog {
    width: min(460px, calc(100vw - 32px));
    border: 0;
    border-radius: 18px;
    padding: 28px 28px 22px;
    color: var(--ute-ink);
    box-shadow: 0 30px 80px -20px rgba(6, 31, 99, .45);
}

.forgot-dialog::backdrop { background: rgba(6, 20, 60, .45); }
.forgot-dialog h3 { margin: 0 0 14px; font-size: 21px; color: var(--ute-primary); }
.forgot-dialog h3 i { margin-right: 8px; }
.forgot-dialog p { margin: 0 0 12px; font-size: 15.5px; line-height: 1.6; color: #34405a; }
.forgot-dialog form { margin-top: 18px; }

/* ---------- Responsive ---------- */
@media (max-width: 1280px) {
    .login-form-col { padding-right: 28px; padding-left: 44px; }
    .login-heading h1 { font-size: 42px; }
    .visual__script { right: 48px; }
    .visual__values { right: 44px; }
}

@media (max-width: 991.98px) {
    .login-shell { height: auto; min-height: 100dvh; padding: 20px 16px; align-items: center; justify-content: center; }
    .login-card { height: auto; max-width: 640px; border-radius: 20px; box-shadow: 0 20px 60px -30px rgba(10, 45, 120, .35); }
    .login-visual, .login-visual-edge { display: none; }
    .login-form-col { width: 100%; height: auto; overflow: visible; padding: 32px 24px 24px; }
    #loginForm { max-width: none; }
    .login-heading { margin: 30px 0 20px; }
}

@media (max-width: 575.98px) {
    .brand__logo-full { height: auto; width: 100%; max-height: 72px; }
    .login-shell { padding: 0; align-items: stretch; }
    .login-card { max-width: none; border-radius: 0; box-shadow: none; min-height: 100dvh; }
    .login-form-col { padding: 24px 16px 20px; }
    .login-heading h1 { font-size: 34px; }
    .eyebrow { font-size: 12px; letter-spacing: 3px; }
    .role-tab span { height: 54px; font-size: 16px; gap: 10px; }
    .role-hint, .check, .link-btn { font-size: 15px; }
    .field { height: 54px; }
    .field__icon { width: 52px; font-size: 17px; }
    .field__input { font-size: 16px; }
    .btn-login { height: 58px; font-size: 18px; }
    .login-footer { font-size: 13px; padding-top: 28px; }
}

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

/* ---------- Quên / Đặt lại mật khẩu ---------- */
.form-success {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    max-width: 580px;
    margin-bottom: 24px;
    padding: 16px 18px;
    border-radius: var(--radius);
    background: #eefaf3;
    border: 1px solid #b9e6cb;
    color: #17633a;
    font-size: 15.5px;
    line-height: 1.6;
}

.form-success i { font-size: 22px; margin-top: 2px; }
.form-success p { margin: 0; }

.form-alert > i { margin-right: 6px; }

.btn-login--link {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 580px;
    margin-bottom: 18px;
    text-decoration: none;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 22px;
    color: var(--ute-primary);
    font-size: 16px;
    text-decoration: none;
}

.back-link:hover { text-decoration: underline; }