/* Màn đăng nhập / đăng ký / quên & đặt lại mật khẩu / xác thực 2 bước — khuôn v3 NAVS (dải thương hiệu bên trái + thẻ
   biểu mẫu bên phải), chép sang TTKK 21/10/2026. Trang đứng riêng (không header/footer site); khung ở public/auth/_au3_open.php
   + _au3_close.php. Mọi màu đi qua --color-* (đỏ trầm TTKK). */
:root {
    --au-bg:      color-mix(in srgb, var(--color-primary) 4%, var(--color-bg));
    --au-surface: var(--color-surface);
    --au-sunken:  color-mix(in srgb, var(--color-primary) 4%, var(--color-soft));
    --au-tint:    color-mix(in srgb, var(--color-primary) 7%, var(--color-surface));
    --au-border:  color-mix(in srgb, var(--color-primary-deep) 9%, var(--color-border));
    --au-hair:    color-mix(in srgb, var(--color-primary-deep) 5%, color-mix(in srgb, var(--color-border) 55%, var(--color-line)));
    --au-ink:     var(--color-ink);
    --au-text:    var(--color-secondary-text);
    --au-muted:   color-mix(in srgb, var(--color-muted) 84%, var(--color-ink));
    --au-faint:   color-mix(in srgb, var(--color-muted) 76%, var(--color-mute2));
    --au-brand:        var(--color-primary);
    --au-brand-strong: var(--color-primary);
    --au-brand-fg:     var(--color-primary-hover);
    --au-brand-deep:   var(--color-primary-deep);
    --au-night: color-mix(in srgb, var(--color-primary-deep) 45%, black);
    --au-deep:  color-mix(in srgb, var(--color-primary-deep) 70%, black);
    --au-mid:   color-mix(in srgb, var(--color-primary-hover) 88%, black);
    --au-deep-ink: color-mix(in srgb, var(--color-primary-deep) 62%, black);
    --au-shade: color-mix(in srgb, var(--color-primary-deep) 50%, black);
    --au-band-grad: linear-gradient(155deg, var(--au-mid) 0%, var(--au-deep) 54%, var(--au-night) 100%);
    --au-on:      var(--color-on-dark);
    --au-on-2:    color-mix(in srgb, var(--color-on-dark) 85%, transparent);
    --au-on-3:    color-mix(in srgb, var(--color-on-dark) 72%, transparent);
    --au-glass:   color-mix(in srgb, var(--color-on-dark) 8%, transparent);
    --au-glass-2: color-mix(in srgb, var(--color-on-dark) 16%, transparent);
    --au-line-d:  color-mix(in srgb, var(--color-on-dark) 15%, transparent);
    --au-mint:    color-mix(in srgb, var(--color-primary-soft) 80%, var(--color-on-dark));
    --au-sh-1: 0 1px 2px color-mix(in srgb, var(--au-shade) 12%, transparent);
    --au-sh-3: 0 2px 4px color-mix(in srgb, var(--au-shade) 9%, transparent),
               0 28px 56px -26px color-mix(in srgb, var(--au-shade) 55%, transparent);
    --au-focus: 0 0 0 3px color-mix(in srgb, var(--color-primary) 22%, transparent);
    --au-ease: cubic-bezier(.4, 0, .2, 1);
    --au-dur: 180ms;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
/* includes/theme.php ép font của body = var(--hsk-font-body) !important (font hệ thống) ⇒ trả các biến font về
   font thương hiệu (Inter + Noto Sans SC của design-tokens) như khung khách v3. */
body {
    --hsk-font: var(--font-sans); --hsk-font-body: var(--font-sans); --hsk-font-heading: var(--font-sans);
    min-height: 100vh; min-height: 100dvh; background: var(--au-bg); color: var(--au-ink);
    font-family: var(--font-sans); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
button, input { font-family: var(--font-sans); }

/* ═══ Khung: dải thương hiệu + cột biểu mẫu ═══ */
.au3 { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr); min-height: 100vh; min-height: 100dvh; }

.au3-side {
    position: sticky; top: 0; align-self: start; min-height: 100vh; min-height: 100dvh;
    isolation: isolate; overflow: hidden; display: flex;
    padding: var(--space-10) var(--space-12);
    color: var(--au-on);
    background:
        radial-gradient(58% 92% at 88% -12%, color-mix(in srgb, var(--color-primary) 55%, transparent), transparent 62%),
        radial-gradient(42% 72% at 26% 128%, color-mix(in srgb, var(--color-accent) 30%, transparent), transparent 70%),
        var(--au-band-grad);
}
/* Lưới chấm (ảnh tĩnh, không blend-mode — iOS không dựng lớp compositing thừa) */
.au3-side::before {
    content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .9;
    background-image: radial-gradient(circle at 1px 1px, color-mix(in srgb, var(--color-on-dark) 16%, transparent) 1px, transparent 1.5px);
    background-size: 20px 20px;
    -webkit-mask-image: linear-gradient(118deg, transparent 12%, black 62%); mask-image: linear-gradient(118deg, transparent 12%, black 62%);
}
/* Chữ 学 mờ làm hoạ tiết nền */
.au3-side::after {
    content: "学"; position: absolute; right: -4%; bottom: -8%; z-index: -1; pointer-events: none;
    font-size: 360px; font-weight: 800; line-height: 1; color: color-mix(in srgb, var(--color-on-dark) 5%, transparent);
}
.au3-side__in { width: 100%; max-width: 468px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-8); }
.au3-top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); }
/* Logo màu đỏ chìm trên dải đỏ ⇒ đặt trên viên nền sáng (giữ nguyên màu logo, không in trắng) */
.au3-logo {
    display: inline-flex; align-items: center; padding: 8px 14px; border-radius: 12px;
    background: var(--au-surface); box-shadow: 0 10px 24px -14px color-mix(in srgb, black 60%, transparent);
}
.au3-logo:focus-visible { outline: 2px solid var(--au-on); outline-offset: 4px; }
.au3-logo img { display: block; width: auto; height: 34px; max-width: 190px; object-fit: contain; }
.au3-home { font-size: 14px; font-weight: 600; line-height: 1.45; color: var(--au-on-2); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.au3-home:hover { color: var(--au-on); text-decoration: underline; text-underline-offset: 2px; }

.au3-story { margin-block: auto; display: flex; flex-direction: column; gap: var(--space-8); }
/* Câu giới thiệu KHÔNG là thẻ tiêu đề — nó đứng trước tiêu đề của thẻ biểu mẫu */
.au3-pitch { font-size: 32px; font-weight: 800; letter-spacing: -.025em; line-height: 1.28; color: var(--au-on); text-wrap: balance; }
.au3-lead { margin-top: var(--space-3); max-width: 46ch; font-size: 15.5px; line-height: 1.65; color: var(--au-on-2); text-wrap: pretty; }

/* Vật thể sản phẩm (minh hoạ): thẻ từ vựng có pinyin + thanh điệu, flashcard chồng mép dưới */
.au3-fig { position: relative; }
.au3-demo { display: flex; flex-direction: column; }
.au3-pron {
    width: 88%; padding: var(--space-5) var(--space-5) var(--space-8); border-radius: 18px;
    background: var(--au-surface); color: var(--au-ink);
    box-shadow: 0 1px 0 color-mix(in srgb, var(--color-on-dark) 35%, transparent) inset, 0 30px 60px -28px color-mix(in srgb, black 70%, transparent);
}
.au3-pron__hd { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-3); }
.au3-pron__w { font-size: 30px; font-weight: 700; letter-spacing: .02em; line-height: 1.25; color: var(--au-ink); }
.au3-pron__ipa { margin-top: 2px; font-size: 15px; line-height: 1.45; color: var(--au-muted); }
.au3-pron__m { margin-top: 2px; font-size: 14px; line-height: 1.45; color: var(--au-text); }
.au3-ring {
    width: 54px; height: 54px; flex-shrink: 0; display: grid; place-items: center; border-radius: 50%;
    background: conic-gradient(var(--au-brand) 0 88%, var(--au-sunken) 0);
}
.au3-ring span {
    width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--au-surface);
    font-size: 13px; font-weight: 800; color: var(--au-brand-fg); line-height: 1.1; text-align: center;
}
.au3-phon { display: flex; flex-wrap: wrap; gap: 6px; margin-top: var(--space-4); }
.au3-phon span {
    padding: 4px 10px; border-radius: 8px; font-size: 14px; font-weight: 600; line-height: 1.45;
    background: color-mix(in srgb, var(--color-secondary) 10%, var(--au-surface)); color: var(--color-secondary-deep);
}
.au3-phon span.is-hl { background: color-mix(in srgb, var(--color-accent) 14%, var(--au-surface)); color: var(--color-accent-deep); }
.au3-pron__tip { margin-top: var(--space-3); font-size: 13.5px; line-height: 1.55; color: var(--au-text); }
.au3-pron__tip b { color: var(--au-ink); }
.au3-fc {
    width: 60%; margin: -22px 0 0 auto; padding: var(--space-4); border-radius: 16px; transform: rotate(-1.5deg);
    background: linear-gradient(145deg, var(--au-mid), var(--au-deep)); border: 1px solid var(--au-line-d);
    box-shadow: 0 1px 0 color-mix(in srgb, var(--color-on-dark) 14%, transparent) inset, 0 24px 44px -20px color-mix(in srgb, black 75%, transparent);
}
.au3-fc__t { font-size: 12.5px; font-weight: 600; line-height: 1.45; color: var(--au-on-3); }
.au3-fc__w { margin-top: 2px; font-size: 24px; font-weight: 700; letter-spacing: .02em; line-height: 1.3; color: var(--au-on); }
.au3-fc__m { margin-top: 2px; font-size: 13px; line-height: 1.5; color: var(--au-on-2); }
.au3-fc__row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin-top: var(--space-3); }
.au3-fc__row b {
    padding: 5px 0; border-radius: 8px; text-align: center; font-size: 12.5px; font-weight: 600; line-height: 1.45;
    color: var(--au-on-2); background: var(--au-glass); border: 1px solid var(--au-line-d);
}
.au3-fc__row b.is-on { color: var(--au-deep-ink); background: var(--au-mint); border-color: transparent; }
/* Chú thích nằm ở khoảng trống dưới thẻ từ vựng, bên trái flashcard */
.au3-demo-note { position: absolute; left: 0; bottom: 6px; font-size: 12px; line-height: 1.45; color: var(--au-on-3); }

.au3-points { display: grid; gap: var(--space-3); padding-top: var(--space-5); border-top: 1px solid var(--au-line-d); list-style: none; }
.au3-points li { display: flex; align-items: flex-start; gap: var(--space-3); font-size: 14.5px; line-height: 1.5; color: var(--au-on-2); }
.au3-points i { margin-top: 3px; width: 16px; text-align: center; color: var(--au-mint); flex-shrink: 0; }

/* Cột biểu mẫu — position + z-index: dải có isolation, cột tĩnh sẽ bị dải vẽ đè khi chồng lớp (điện thoại) */
.au3-main {
    position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: var(--space-12) var(--space-8);
    background: radial-gradient(62% 52% at 82% 0%, color-mix(in srgb, var(--color-primary) 7%, transparent), transparent 70%);
}
.au3-col { width: 100%; max-width: 440px; }
.au-form-box {
    background: var(--au-surface); border: 1px solid var(--au-border); border-radius: var(--radius-xl);
    box-shadow: var(--au-sh-3); padding: var(--space-8);
}
.au3-legal { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-1) var(--space-5); margin-top: var(--space-5); font-size: 13px; line-height: 1.5; }
.au3-legal a { color: var(--au-muted); text-decoration: none; }
.au3-legal a:hover { color: var(--au-ink); text-decoration: underline; text-underline-offset: 2px; }

/* Tabs — nút gạt hai nấc */
.au-tabs {
    display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; margin-bottom: var(--space-6);
    border-radius: 13px; background: var(--au-sunken); border: 1px solid var(--au-hair);
}
.au-tab {
    height: 40px; border: 0; border-radius: 10px; background: transparent; cursor: pointer;
    font-size: 14.5px; font-weight: 600; line-height: 1.45; color: var(--au-muted);
    transition: background var(--au-dur) var(--au-ease), color var(--au-dur) var(--au-ease), box-shadow var(--au-dur) var(--au-ease);
}
.au-tab:hover { color: var(--au-ink); }
.au-tab.is-active { background: var(--au-surface); color: var(--au-ink); box-shadow: var(--au-sh-1), 0 0 0 1px var(--au-hair); }
.au-tab:focus-visible { outline: 2px solid var(--au-brand-fg); outline-offset: 2px; }

/* View heading */
.au-vhead { margin-bottom: var(--space-6); }
.au-vtitle { font-size: 24px; font-weight: 800; letter-spacing: -.02em; line-height: 1.3; color: var(--au-ink); }
.au-vsub { margin-top: 6px; font-size: 14.5px; line-height: 1.55; color: var(--au-muted); }
.au-vsub strong { color: var(--au-ink); font-weight: 600; overflow-wrap: anywhere; }

/* Alerts */
.au-alert {
    display: flex; align-items: flex-start; gap: var(--space-3); margin-bottom: var(--space-5); padding: var(--space-3) var(--space-4);
    border-radius: 12px; border: 1px solid transparent; font-size: 14px; font-weight: 500; line-height: 1.5;
}
.au-alert i { margin-top: 3px; flex-shrink: 0; }
.au-alert--err {
    background: color-mix(in srgb, var(--color-warning) 9%, var(--au-surface));
    border-color: color-mix(in srgb, var(--color-warning) 32%, var(--au-border)); color: var(--color-warning-deep);
}
.au-alert--ok {
    background: color-mix(in srgb, var(--color-secondary) 7%, var(--au-surface));
    border-color: color-mix(in srgb, var(--color-secondary) 28%, var(--au-border)); color: var(--color-secondary-deep);
}

/* Khối đăng nhập (mượn lớp au-lg-* của NAVS; ở TTKK là form một bước — đủ ô ngay từ đầu) */
.au-lg-link {
    padding: 0; background: none; border: 0; cursor: pointer; text-decoration: none;
    font: inherit; font-size: 14px; font-weight: 600; line-height: 1.5; color: var(--au-brand-fg);
}
.au-lg-link:hover { text-decoration: underline; text-underline-offset: 2px; }
.au-lg-alt { margin-top: var(--space-4); text-align: center; font-size: 14px; line-height: 1.5; color: var(--au-muted); }

/* Google button */
.au-google {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    width: 100%; height: 50px; padding: 0 var(--space-4); margin-bottom: var(--space-5);
    background: var(--au-surface); border: 1px solid var(--au-border); border-radius: 13px; box-shadow: var(--au-sh-1);
    font-size: 15px; font-weight: 600; line-height: 1.45; color: var(--au-ink); text-decoration: none; cursor: pointer;
    transition: background var(--au-dur) var(--au-ease), border-color var(--au-dur) var(--au-ease);
}
.au-google:hover { background: var(--au-tint); border-color: color-mix(in srgb, var(--color-primary) 45%, var(--au-border)); color: var(--au-ink); }
.au-google:focus-visible { outline: 2px solid var(--au-brand-fg); outline-offset: 2px; }
.au-google svg { width: 18px; height: 18px; flex-shrink: 0; }

/* Divider */
.au-sep { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-5); font-size: 13px; line-height: 1.45; color: var(--au-faint); }
.au-sep::before, .au-sep::after { content: ''; flex: 1; height: 1px; background: var(--au-hair); }

/* Fields — cỡ chữ ô nhập 16px: nhỏ hơn là Safari iPhone tự phóng to trang khi chạm vào ô */
.au-grp { margin-bottom: var(--space-4); }
.au-grp-lg { margin-bottom: var(--space-6); }
.au-lbl { display: block; margin-bottom: 7px; font-size: 13.5px; font-weight: 600; line-height: 1.45; color: var(--au-text); }
.au-fwrap { position: relative; }
.au-in {
    display: block; width: 100%; height: 48px; padding: 0 14px; outline: none;
    border: 1px solid var(--au-border); border-radius: 12px; background: var(--au-surface); box-shadow: var(--au-sh-1);
    font-size: 16px; font-weight: 500; line-height: 1.4; color: var(--au-ink);
    transition: border-color var(--au-dur) var(--au-ease), box-shadow var(--au-dur) var(--au-ease);
}
.au-in::placeholder { color: var(--au-faint); font-weight: 400; }
.au-in:hover { border-color: color-mix(in srgb, var(--color-primary) 30%, var(--au-border)); }
.au-in:focus { border-color: var(--au-brand); box-shadow: var(--au-focus); }
.au-in.has-icon { padding-right: 46px; }
.au-eye {
    position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
    width: 36px; height: 36px; display: grid; place-items: center; border: 0; border-radius: 9px;
    background: transparent; color: var(--au-faint); cursor: pointer; font-size: 14px;
    transition: color var(--au-dur) var(--au-ease), background var(--au-dur) var(--au-ease);
}
.au-eye:hover { color: var(--au-ink); background: var(--au-sunken); }
.au-otp { height: 60px; text-align: center; text-indent: .32em; font-size: 26px; font-weight: 800; letter-spacing: .32em; font-variant-numeric: tabular-nums; }
.au-row2 { display: flex; gap: var(--space-3); }
.au-row2 .au-grp { flex: 1; min-width: 0; }

/* Mã giới thiệu (không bắt buộc) — gập sẵn, ai có mã mới mở */
.au-ref { margin: 0 0 var(--space-4); }
.au-ref > summary {
    list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: var(--space-2);
    font-size: 14px; font-weight: 600; line-height: 1.5; color: var(--au-brand-fg); border-radius: var(--radius-sm);
}
.au-ref > summary::-webkit-details-marker { display: none; }
.au-ref > summary::after { content: '+'; font-weight: 700; }
.au-ref[open] > summary::after { content: '\2212'; }
.au-ref > summary:focus-visible { outline: 2px solid var(--au-brand-fg); outline-offset: 2px; }
.au-ref__body { margin-top: var(--space-3); }
.au-ref__opt { font-weight: 400; color: var(--au-faint); }
.au-ref__hint { margin: var(--space-2) 0 0; font-size: 12.5px; line-height: 1.5; color: var(--au-muted); }

/* Form footer */
.au-ffoot { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-5); }
.au-ckwrap { display: flex; align-items: center; gap: 8px; font-size: 14px; line-height: 1.45; color: var(--au-text); cursor: pointer; }
/* Custom checkbox — bo góc, tick trắng trên nền đỏ khi chọn */
.au-ckwrap input[type="checkbox"], .au-crow input[type="checkbox"] {
    appearance: none; -webkit-appearance: none; flex-shrink: 0; margin: 0;
    width: 18px; height: 18px; min-width: 18px;
    border: 1.5px solid var(--au-border); border-radius: 6px;
    background: var(--au-surface); cursor: pointer;
    display: inline-grid; place-content: center;
    transition: background var(--au-dur) var(--au-ease), border-color var(--au-dur) var(--au-ease);
}
.au-ckwrap input[type="checkbox"]::before, .au-crow input[type="checkbox"]::before {
    content: ""; width: 11px; height: 11px; transform: scale(0);
    transition: transform .12s ease; background: var(--au-on);
    clip-path: polygon(14% 44%, 0 60%, 43% 100%, 100% 18%, 84% 0, 41% 71%);
}
.au-ckwrap input[type="checkbox"]:checked, .au-crow input[type="checkbox"]:checked { background: var(--au-brand-strong); border-color: var(--au-brand-strong); }
.au-ckwrap input[type="checkbox"]:checked::before, .au-crow input[type="checkbox"]:checked::before { transform: scale(1); }
.au-ckwrap input[type="checkbox"]:hover, .au-crow input[type="checkbox"]:hover { border-color: var(--au-brand); }
.au-ckwrap input[type="checkbox"]:focus-visible, .au-crow input[type="checkbox"]:focus-visible { outline: 2px solid var(--au-brand-fg); outline-offset: 2px; }

/* Links */
.au-lnk { font-size: 14px; font-weight: 600; color: var(--au-brand-fg); text-decoration: none; }
.au-lnk:hover { text-decoration: underline; text-underline-offset: 2px; }
.au-lnk-q { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 500; color: var(--au-muted); text-decoration: none; }
.au-lnk-q:hover { color: var(--au-ink); }

/* Submit button */
.au-btn {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%; height: 50px; padding: 0 var(--space-5); border: 1px solid transparent; border-radius: 13px;
    background: var(--au-brand-strong); color: var(--au-on); cursor: pointer; text-decoration: none;
    font-size: 15px; font-weight: 700; line-height: 1.45; letter-spacing: -.005em;
    box-shadow: 0 1px 0 color-mix(in srgb, var(--color-on-dark) 20%, transparent) inset,
                0 10px 22px -12px color-mix(in srgb, var(--color-primary) 90%, transparent);
    transition: background var(--au-dur) var(--au-ease), box-shadow var(--au-dur) var(--au-ease), opacity var(--au-dur) var(--au-ease);
}
.au-btn:hover { background: var(--color-primary-hover); }
.au-btn:focus-visible { outline: 2px solid var(--au-brand-fg); outline-offset: 2px; }
.au-btn:disabled { opacity: .45; cursor: not-allowed; box-shadow: none; }
a.au-btn, a.au-btn:hover { color: var(--au-on); text-decoration: none; }

/* Consent rows */
.au-consent { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-5); }
.au-crow {
    display: flex; align-items: flex-start; gap: var(--space-3); padding: var(--space-3);
    border: 1px solid var(--au-border); border-radius: 12px; background: var(--au-sunken); cursor: pointer;
    transition: border-color var(--au-dur) var(--au-ease), background var(--au-dur) var(--au-ease);
}
.au-crow:hover { border-color: color-mix(in srgb, var(--color-primary) 45%, var(--au-border)); }
.au-crow:has(input:checked) { background: var(--au-tint); border-color: color-mix(in srgb, var(--color-primary) 38%, var(--au-border)); }
.au-crow input[type="checkbox"] { margin-top: 1px; }
.au-ctext { font-size: 13.5px; line-height: 1.5; color: var(--au-text); }
.au-req { color: var(--color-primary); }
.au-cerr {
    display: none; align-items: center; gap: var(--space-2); padding: 10px var(--space-3); border-radius: 12px;
    background: color-mix(in srgb, var(--color-warning) 9%, var(--au-surface)); color: var(--color-warning-deep);
    font-size: 13.5px; font-weight: 600; line-height: 1.5;
}

.au-back-link { text-align: center; margin-top: var(--space-6); }

/* ─── Hộp đồng ý trước khi tạo tài khoản bằng Google — không blur nền (iOS: lớp compositing thừa) ─── */
.gcm-bg {
    display: none; position: fixed; inset: 0; z-index: 9999; padding: var(--space-5);
    align-items: center; justify-content: center;
    background: color-mix(in srgb, var(--au-night) 62%, transparent);
}
.gcm-bg.on { display: flex; }
.gcm-card {
    width: 100%; max-width: 440px; padding: var(--space-8); border-radius: var(--radius-xl);
    background: var(--au-surface); border: 1px solid var(--au-border); box-shadow: var(--au-sh-3);
    animation: gcm-in .22s cubic-bezier(.16,1,.3,1);
}
@keyframes gcm-in { from { opacity: 0; transform: scale(.96) translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes gcm-up { from { transform: translateY(100%); } to { transform: none; } }
.gcm-title { margin-bottom: 6px; font-size: 20px; font-weight: 800; letter-spacing: -.02em; line-height: 1.3; color: var(--au-ink); }
.gcm-sub { margin-bottom: var(--space-5); font-size: 14.5px; line-height: 1.55; color: var(--au-muted); }
.gcm-foot { display: flex; flex-direction: column; gap: var(--space-2); margin-top: var(--space-5); }
.gcm-go[data-off="1"] { opacity: .45; cursor: not-allowed; pointer-events: none; box-shadow: none; }
.gcm-esc {
    width: 100%; height: 46px; border: 0; border-radius: 12px; background: transparent; cursor: pointer;
    font-size: 14.5px; font-weight: 600; line-height: 1.45; color: var(--au-muted);
    transition: background var(--au-dur) var(--au-ease), color var(--au-dur) var(--au-ease);
}
.gcm-esc:hover { background: var(--au-sunken); color: var(--au-ink); }
.gcm-errline {
    display: none; align-items: center; gap: var(--space-2); margin: var(--space-3) 0 0; padding: 9px var(--space-3); border-radius: 12px;
    background: color-mix(in srgb, var(--color-warning) 9%, var(--au-surface)); color: var(--color-warning-deep);
    font-size: 13.5px; font-weight: 600; line-height: 1.5;
}

/* Laptop cỡ hẹp / màn thấp: khép khoảng trước, rồi bỏ vật thể minh hoạ, cuối cùng bỏ câu mô tả */
@media (min-width: 881px) and (max-width: 1120px) {
    .au3-side { padding-inline: var(--space-8); }
    .au3-pitch { font-size: 28px; }
    .au3-main { padding-inline: var(--space-6); }
}
@media (min-width: 881px) and (max-height: 900px) {
    .au3-side { padding-block: var(--space-8); }
    .au3-side__in, .au3-story { gap: var(--space-6); }
    .au3-pron { padding-bottom: 30px; }
    .au3-pron__tip { display: none; }
}
@media (min-width: 881px) and (max-height: 760px) { .au3-fig { display: none; } }
@media (min-width: 881px) and (max-height: 600px) { .au3-lead { display: none; } }

/* Điện thoại / máy tính bảng dọc: dải đỏ thu thành đầu trang, thẻ biểu mẫu chồng lên mép dưới */
@media (max-width: 880px) {
    .au3 { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto 1fr; }
    .au3-side {
        position: relative; min-height: 0; display: block;
        padding: calc(env(safe-area-inset-top, 0px) + var(--space-5)) var(--space-4) 64px;
    }
    .au3-side::after { font-size: 200px; bottom: -30%; }
    .au3-side__in { max-width: 520px; gap: var(--space-4); }
    .au3-story { margin: 0; gap: 0; }
    .au3-lead, .au3-fig, .au3-points { display: none; }
    .au3-pitch { font-size: 15px; font-weight: 600; letter-spacing: 0; line-height: 1.5; color: var(--au-on-2); }
    .au3-logo img { height: 28px; max-width: 150px; }
    /* 44px đầu trong suốt để dải lộ ra hai bên thẻ; phía dưới nền đặc */
    .au3-main {
        display: block; margin-top: -44px; padding: 0 var(--space-4) max(env(safe-area-inset-bottom, 0px), var(--space-8));
        background: linear-gradient(transparent 44px, var(--au-bg) 44px);
    }
    .au3-col { max-width: 520px; margin: 0 auto; }
    /* Kéo quá đầu trang (cao su iPhone): chỗ hở phía trên dải lộ màu dải thay vì nền sáng */
    body::before { content: ""; position: fixed; top: 0; left: 0; right: 0; height: 50vh; z-index: -1; pointer-events: none; background: var(--au-mid); }
}
@media (max-width: 520px) {
    .au-form-box { padding: var(--space-6) var(--space-5); border-radius: 18px; }
    .au-vtitle { font-size: 22px; }
    .au-row2 { flex-direction: column; gap: 0; }
    /* Hộp đồng ý thành tấm trượt từ đáy */
    .gcm-bg { align-items: flex-end; padding: 0; }
    .gcm-card {
        max-width: none; border-radius: 20px 20px 0 0; border-bottom: 0; animation-name: gcm-up;
        padding: var(--space-6) var(--space-5) calc(env(safe-area-inset-bottom, 0px) + var(--space-5));
    }
}

/* Màn xác thực 2 bước (/login/2fa) — ô nhận cả mã 6 số lẫn mã dự phòng chữ+số */
.au-code { height: 56px; text-align: center; font-family: var(--font-mono); font-size: 20px; font-weight: 700; letter-spacing: .2em; }
.au-ic {
    width: 52px; height: 52px; margin-bottom: var(--space-4); display: grid; place-items: center; border-radius: 14px;
    background: var(--au-tint); color: var(--au-brand-fg); font-size: 22px;
}
.au-hint { margin-top: var(--space-2); font-size: 13px; line-height: 1.5; color: var(--au-muted); }