/* ================================================================
   y2k.css — HAIWrite Student · Y2K Cyberpunk
   Nạp CUỐI CÙNG trong _Layout / _AuthenticationLayout để ghi đè vendor
   (Bootstrap/Viho + theme-*.css). Site học sinh chỉ có một giao diện
   (neon night): <html data-theme="dark"> cố định, không còn nút đổi theme.
   ================================================================ */

:root,
html[data-theme="dark"] {
    /* Core palette */
    --y-void:     #080519;   /* nền */
    --y-panel:    #130d33;   /* mặt thẻ */
    --y-panel-2:  #1c1247;
    --y-line:     #3a2a86;
    --y-ink:      #f3eeff;
    --y-dim:      #a99fd6;
    --y-pink:     #ff2bd6;
    --y-cyan:     #19f3ff;
    --y-lime:     #c6ff3d;
    --y-amber:    #ffb627;
    --y-red:      #ff4d6d;
    --y-chrome:   linear-gradient(180deg, #ffffff 0%, #c9d4ff 38%, #7c86c9 52%, #e9ecff 100%);
    --y-holo:     linear-gradient(100deg, #19f3ff, #b66bff 38%, #ff2bd6 62%, #ffb627);

    --y-font-display: "Unbounded", "Arial Black", system-ui, sans-serif;
    --y-font-body:    "Space Grotesk", "Segoe UI", system-ui, sans-serif;

    /* Ghi đè token dùng chung của vendor/theme-*.css */
    --primary:       var(--y-cyan);
    --primary-hover: #7ff8ff;
    --primary-light: rgba(25, 243, 255, .12);
    --accent:        var(--y-lime);
    --accent-light:  rgba(198, 255, 61, .12);
    --bg-body:       var(--y-void);
    --white:         var(--y-panel);
    --border:        var(--y-line);
    --text-main:     var(--y-ink);
    --text-muted:    var(--y-dim);
    --gray-light:    var(--y-line);
    --success:       var(--y-lime);
    --success-light: rgba(198, 255, 61, .12);
    --success-text:  var(--y-lime);
    --danger:        var(--y-red);
    --danger-light:  rgba(255, 77, 109, .14);
    --danger-text:   #ff8fa5;
    --warning:       var(--y-amber);
    --warning-light: rgba(255, 182, 39, .14);
    --warning-text:  var(--y-amber);
    --info:          var(--y-cyan);
    --info-light:    rgba(25, 243, 255, .12);
    --info-text:     var(--y-cyan);
    --radius-sm: 4px;
    --radius-md: 6px;
    --shadow-sm: none;
    --shadow-md: none;
    color-scheme: dark;
}

/* ---------- Base ---------- */
html { background: var(--y-void); }
body {
    font-family: var(--y-font-body);
    color: var(--y-ink);
    background:
        radial-gradient(60rem 30rem at 85% -10%, rgba(255, 43, 214, .22), transparent 60%),
        radial-gradient(50rem 30rem at -10% 10%, rgba(25, 243, 255, .16), transparent 60%),
        var(--y-void);
    background-attachment: fixed;
    min-height: 100vh;
    position: relative;
}
/* Lưới perspective ở đáy trang + scanline rất nhẹ */
body::before {
    content: "";
    position: fixed; inset: auto 0 0 0; height: 46vh;
    pointer-events: none; z-index: 0;
    background-image:
        linear-gradient(rgba(25, 243, 255, .28) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 43, 214, .28) 1px, transparent 1px);
    background-size: 48px 48px;
    transform: perspective(380px) rotateX(62deg);
    transform-origin: bottom;
    -webkit-mask-image: linear-gradient(to top, #000 0%, transparent 85%);
            mask-image: linear-gradient(to top, #000 0%, transparent 85%);
    opacity: .55;
}
body::after {
    content: "";
    position: fixed; inset: 0; pointer-events: none; z-index: 9999;
    background: repeating-linear-gradient(0deg, rgba(255,255,255,.025) 0 1px, transparent 1px 3px);
    mix-blend-mode: overlay;
}
.page-wrapper, .container-fluid { position: relative; z-index: 1; background: transparent !important; }

::selection { background: var(--y-pink); color: #fff; }
a { color: var(--y-cyan); text-decoration-color: rgba(25, 243, 255, .4); text-underline-offset: 3px; }
a:hover { color: var(--y-lime); }
:focus-visible { outline: 2px solid var(--y-lime); outline-offset: 3px; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--y-void); }
::-webkit-scrollbar-thumb { background: var(--y-line); border: 2px solid var(--y-void); }
::-webkit-scrollbar-thumb:hover { background: var(--y-pink); }

h1, h2, h3, h4, h5, h6, .page-title {
    font-family: var(--y-font-display);
    color: var(--y-ink);
    letter-spacing: -.01em;
    line-height: 1.2;
}
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.05rem; }
.text-muted, .small.text-muted { color: var(--y-dim) !important; }
.text-danger { color: var(--y-red) !important; }
.text-success { color: var(--y-lime) !important; }
.text-primary { color: var(--y-cyan) !important; }
.text-warning { color: var(--y-amber) !important; }
hr { border-color: var(--y-line); opacity: 1; }

/* ---------- Header ---------- */
.student-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(8, 5, 25, .82);
    -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
    border-bottom: 2px solid var(--y-pink);
    box-shadow: 0 6px 0 -3px var(--y-cyan), 0 10px 40px rgba(255, 43, 214, .25);
}
.student-header-inner { width: 100%; max-width: 1280px; margin: 0 auto; }
.student-brand-link { color: var(--y-ink); }
.y-logo {
    font-family: var(--y-font-display); font-weight: 900; font-size: 1.25rem; letter-spacing: -.02em;
    background: var(--y-chrome); -webkit-background-clip: text; background-clip: text; color: transparent;
    -webkit-text-stroke: 1px rgba(25, 243, 255, .5);
    filter: drop-shadow(2px 2px 0 var(--y-pink));
}
.y-logo-mark {
    width: 34px; height: 34px; display: grid; place-items: center; flex: none;
    background: var(--y-holo); color: #080519; font-family: var(--y-font-display); font-weight: 900; font-size: .95rem;
    clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
}
.student-nav a {
    font-family: var(--y-font-display); font-size: .72rem; font-weight: 500;
    color: var(--y-ink); text-decoration: none; padding: .45rem .8rem;
    border: 1px solid transparent; transition: border-color .15s, color .15s, background .15s;
}
.student-nav a:hover { color: var(--y-cyan); border-color: var(--y-cyan); background: rgba(25, 243, 255, .08); }
.student-nav a.is-active { color: #080519; background: var(--y-lime); box-shadow: 3px 3px 0 var(--y-pink); }
.student-main { max-width: 1280px; position: relative; z-index: 1; padding-top: 2rem !important; padding-bottom: 6rem !important; }

/* ---------- Cards ---------- */
.card {
    background: linear-gradient(160deg, var(--y-panel-2), var(--y-panel) 60%);
    color: var(--y-ink);
    border: 1px solid var(--y-line);
    border-radius: 0;
    clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
    box-shadow: none;
    position: relative;
}
.card::before {  /* viền sáng góc trên */
    content: ""; position: absolute; left: 0; top: 0; right: 18px; height: 2px;
    background: var(--y-holo); opacity: .9;
}
.card-header { background: rgba(25, 243, 255, .08); border-bottom: 1px solid var(--y-line); font-family: var(--y-font-display); font-size: .85rem; }
.card-title { font-size: 1.05rem; }
a.card:hover, .y-prompt:hover { border-color: var(--y-cyan); }

/* ---------- Buttons ---------- */
.btn {
    font-family: var(--y-font-display); font-weight: 600; font-size: .78rem; letter-spacing: 0;
    border-radius: 0; border: 2px solid var(--y-ink);
    padding: .65rem 1.15rem;
    clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
    transition: transform .12s ease, background .12s, color .12s, box-shadow .12s;
}
.btn-lg { font-size: .9rem; padding: .85rem 1.5rem; }
.btn-sm { font-size: .68rem; padding: .4rem .8rem; }
.btn:hover { transform: translate(-2px, -2px); }
.btn:active { transform: translate(1px, 1px); }
.btn-primary, .btn-success {
    background: var(--y-lime); border-color: var(--y-lime); color: #080519;
    filter: drop-shadow(4px 4px 0 var(--y-pink));
}
.btn-primary:hover, .btn-primary:focus, .btn-success:hover, .btn-success:focus {
    background: var(--y-cyan); border-color: var(--y-cyan); color: #080519;
    filter: drop-shadow(5px 5px 0 var(--y-pink));
}
.btn-outline-primary, .btn-outline-secondary, .btn-light {
    background: transparent; color: var(--y-cyan); border-color: var(--y-cyan);
}
.btn-outline-secondary { color: var(--y-ink); border-color: var(--y-line); }
.btn-outline-primary:hover, .btn-outline-secondary:hover, .btn-light:hover {
    background: var(--y-cyan); border-color: var(--y-cyan); color: #080519;
}
.btn-danger, .btn-outline-danger { background: transparent; color: var(--y-red); border-color: var(--y-red); }
.btn-danger:hover, .btn-outline-danger:hover { background: var(--y-red); color: #080519; }
.btn:disabled, .btn.disabled { opacity: .4; filter: none; }

/* ---------- Badges ---------- */
.badge {
    font-family: var(--y-font-body); font-weight: 700; font-size: .72rem; letter-spacing: .02em;
    border-radius: 0; padding: .35em .65em; border: 1px solid currentColor;
}
.badge.bg-primary   { background: var(--y-pink) !important; border-color: var(--y-pink); color: #fff !important; }
.badge.bg-secondary { background: transparent !important; color: var(--y-cyan) !important; border-color: var(--y-cyan); }
.badge.bg-info      { background: rgba(25,243,255,.15) !important; color: var(--y-cyan) !important; }
.badge.bg-warning   { background: var(--y-amber) !important; color: #080519 !important; border-color: var(--y-amber); }
.badge.bg-success   { background: var(--y-lime) !important; color: #080519 !important; border-color: var(--y-lime); }
.badge.bg-danger    { background: var(--y-red) !important; color: #080519 !important; border-color: var(--y-red); }
.badge.bg-dark      { background: #000 !important; color: var(--y-lime) !important; border-color: var(--y-lime); font-family: var(--y-font-display); }

/* ---------- Alerts ---------- */
.alert {
    background: rgba(25, 243, 255, .08); color: var(--y-ink);
    border: 1px solid var(--y-cyan); border-left-width: 6px; border-radius: 0;
}
.alert-success   { background: rgba(198,255,61,.1);  border-color: var(--y-lime); }
.alert-warning   { background: rgba(255,182,39,.12); border-color: var(--y-amber); }
.alert-danger    { background: rgba(255,77,109,.14); border-color: var(--y-red); }
.alert-secondary { background: rgba(169,159,214,.1); border-color: var(--y-dim); }

/* ---------- Forms ---------- */
.form-label, label { color: var(--y-ink); font-weight: 600; }
.form-control, .form-select, .input-group-text {
    background-color: rgba(8, 5, 25, .75); color: var(--y-ink);
    border: 1px solid var(--y-line); border-radius: 0; font-family: var(--y-font-body);
}
.input-group-text { color: var(--y-cyan); border-right: 0; }
.form-control::placeholder { color: #6d63a3; }
.form-control:focus, .form-select:focus {
    background-color: rgba(8, 5, 25, .95); color: var(--y-ink);
    border-color: var(--y-cyan); box-shadow: 0 0 0 3px rgba(25, 243, 255, .22), 0 0 18px rgba(25, 243, 255, .25);
}
.form-select { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%2319f3ff' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e"); }
.form-select option { background: var(--y-panel); color: var(--y-ink); }
textarea.form-control { line-height: 1.7; }

/* ---------- Tables ---------- */
.table { --bs-table-bg: transparent; --bs-table-color: var(--y-ink); --bs-table-border-color: var(--y-line);
         --bs-table-striped-bg: rgba(255,255,255,.03); color: var(--y-ink); border-color: var(--y-line); }
.table > :not(caption) > * > * { background: transparent; color: var(--y-ink); border-bottom-color: var(--y-line); }
.table thead th { font-family: var(--y-font-display); font-weight: 500; font-size: .7rem; color: var(--y-cyan); border-bottom: 2px solid var(--y-cyan); }
.table-hover tbody tr:hover > * { background: rgba(255, 43, 214, .1); }

/* ---------- Dropdown / misc ---------- */
.dropdown-menu { background: var(--y-panel); border: 2px solid var(--y-cyan); border-radius: 0; box-shadow: 5px 5px 0 var(--y-pink); padding: .4rem; }
.dropdown-item { color: var(--y-ink); font-weight: 600; border-radius: 0; }
.dropdown-item:hover, .dropdown-item:focus { background: var(--y-lime); color: #080519; }
.dropdown-divider { border-color: var(--y-line); }
.progress { background: var(--y-void); border: 1px solid var(--y-line); border-radius: 0; }
.progress-bar { background: var(--y-holo); }
.spinner-border { color: var(--y-cyan) !important; }
.list-group-item { background: transparent; color: var(--y-ink); border-color: var(--y-line); }
.border { border-color: var(--y-line) !important; }
.rounded { border-radius: 0 !important; }
.modal-content { background: var(--y-panel); border: 2px solid var(--y-pink); border-radius: 0; }

/* ================================================================
   Thành phần riêng của trang học sinh
   ================================================================ */

/* ---------- Hero (Home) ---------- */
.y-hero { padding: 1.5rem 0 2.5rem; position: relative; }
.y-hero-sticker {
    display: inline-block; font-family: var(--y-font-display); font-size: .7rem; font-weight: 600;
    color: #080519; background: var(--y-amber); padding: .35rem .8rem;
    transform: rotate(-3deg); box-shadow: 3px 3px 0 var(--y-pink); margin-bottom: 1.1rem;
}
.y-hero h1 {
    font-size: clamp(2.4rem, 8vw, 5.6rem); font-weight: 900; line-height: 1.02; letter-spacing: -.03em; word-spacing: .15em; margin: 0 0 1rem;
    background: var(--y-chrome); -webkit-background-clip: text; background-clip: text; color: transparent;
    -webkit-text-stroke: 1px rgba(25, 243, 255, .55);
    filter: drop-shadow(4px 4px 0 var(--y-pink)) drop-shadow(-2px -2px 0 rgba(25, 243, 255, .5));
    position: relative; max-width: 16ch;
}
.y-hero p { max-width: 54ch; color: var(--y-dim); font-size: 1.05rem; line-height: 1.6; }
/* Một khoảnh khắc chuyển động duy nhất: tiêu đề glitch RGB một lần khi vào trang */
@keyframes y-glitch {
    0%   { transform: translate(0); filter: drop-shadow(4px 4px 0 var(--y-pink)) drop-shadow(-2px -2px 0 rgba(25,243,255,.5)); }
    15%  { transform: translate(-6px, 2px); filter: drop-shadow(-8px 0 0 var(--y-cyan)) drop-shadow(8px 0 0 var(--y-pink)); clip-path: inset(10% 0 55% 0); }
    30%  { transform: translate(6px, -2px); clip-path: inset(55% 0 10% 0); }
    45%  { transform: translate(-3px, 0);   clip-path: inset(0); }
    100% { transform: translate(0); filter: drop-shadow(4px 4px 0 var(--y-pink)) drop-shadow(-2px -2px 0 rgba(25,243,255,.5)); clip-path: inset(0); }
}
.y-hero h1 { animation: y-glitch .7s steps(2, end) .15s 1 both; }

/* ---------- Filter bar ---------- */
.y-filter { display: grid; grid-template-columns: 1fr 12rem auto; gap: .75rem; margin-bottom: 2rem; }
@media (max-width: 767.98px) { .y-filter { grid-template-columns: 1fr; } }

/* ---------- Prompt grid ---------- */
.y-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr)); gap: 1.5rem; }
.y-prompt { height: 100%; display: flex; flex-direction: column; transition: transform .15s; }
.y-prompt:hover { transform: translateY(-4px); }
.y-prompt .card-body { display: flex; flex-direction: column; flex: 1; padding: 1.4rem; }
.y-prompt h5 { margin: .8rem 0 .5rem; }
.y-prompt-meta { font-size: .82rem; color: var(--y-lime); font-weight: 700; margin: .9rem 0; }
.y-prompt .excerpt { color: var(--y-dim); flex: 1; line-height: 1.55; }
.y-empty { border: 2px dashed var(--y-line); padding: 3rem 1rem; text-align: center; color: var(--y-dim); }
.y-empty strong { display: block; font-family: var(--y-font-display); color: var(--y-ink); margin-bottom: .4rem; }

/* ---------- Write screen ---------- */
#essayText {
    font-family: var(--y-font-body); font-size: 1.05rem; line-height: 1.75;
    border: 2px solid var(--y-line); background: rgba(8, 5, 25, .9);
    background-image: repeating-linear-gradient(transparent 0 1.75em, rgba(25, 243, 255, .07) 1.75em calc(1.75em + 1px));
    background-attachment: local;
}
#wordCount { font-family: var(--y-font-display); font-size: 1.6rem; }
#timer { font-size: 1.1rem !important; padding: .5em .8em; box-shadow: 0 0 18px rgba(198, 255, 61, .45); }
#timer.bg-danger { color: var(--y-red) !important; border-color: var(--y-red); box-shadow: 0 0 18px rgba(255, 77, 109, .6); }

/* ---------- Login ---------- */
body.y-auth { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-card {
    background: linear-gradient(160deg, var(--y-panel-2), var(--y-panel)) !important;
    border: 2px solid var(--y-cyan) !important; border-radius: 0 !important;
    box-shadow: 8px 8px 0 var(--y-pink) !important;
    max-width: 400px;
}
.login-form, .login-form.theme-form { background-color: transparent !important; }
.y-login-title { font-family: var(--y-font-display); font-size: 1.7rem; font-weight: 900; margin: 0; }
.y-login-sub { color: var(--y-lime); font-weight: 700; margin: .3rem 0 0; }

/* ---------- Vendor leftovers ---------- */
.page-wrapper { background: transparent !important; }
.page-title { font-size: 1.3rem; }

@media (prefers-reduced-motion: reduce) {
    .y-hero h1 { animation: none; }
    .btn, .y-prompt { transition: none; }
}
@media (max-width: 575.98px) {
    .student-nav { margin-left: .5rem; gap: .25rem; }
    .student-nav a { padding: .35rem .5rem; font-size: .62rem; }
    .y-logo { display: none; }
}

/* Login: vendor .login-form ép chiều cao/viewport — thu về theo nội dung */
.login-card { height: auto !important; min-height: 0 !important; padding: 2.5rem 2rem !important; }
.login-form, .login-form.theme-form { height: auto !important; min-height: 0 !important; padding: 0 !important; box-shadow: none !important; }
.login-card .btn { text-transform: none; }
.btn-primary, .btn-primary:hover, .btn-primary:focus, .btn-success, .btn-success:hover { color: #080519 !important; }