/* ==========================================================================
   SNAP — Giao diện: xám bạc, kính mờ, ảnh nền phong cảnh
   ========================================================================== */

:root {
    --bg: #0a0b0d;
    /* Lớp phủ trên ảnh nền — mỏng ở trên để thấy rõ ảnh, dày dần xuống dưới
       để phần nội dung dài vẫn đọc được. */
    --veil-1: rgba(10, 12, 16, .12);
    --veil-2: rgba(10, 12, 16, .52);
    --veil-3: rgba(10, 11, 13, .90);

    /* Kính mờ tối: đủ đục để chữ nổi trên vùng mây sáng của ảnh nền. */
    --panel: rgba(12, 14, 18, .42);
    --panel-2: rgba(255, 255, 255, .09);
    --card: rgba(14, 16, 20, .82);
    --line: rgba(255, 255, 255, .09);
    --line-2: rgba(255, 255, 255, .16);

    --text: #fbfcfd;
    --muted: #d8dde3;
    --faint: #aeb6bf;

    --solid: #f2f4f6;                  /* nút chính: nền sáng, chữ tối */
    --solid-ink: #14161a;
    --accent: #b8c2cc;                 /* nhấn: bạc lạnh */
    --accent-soft: rgba(184, 194, 204, .12);
    --ok: #7fbf9a;
    --warn: #d2b071;
    --danger: #d98a8a;

    --radius: 14px;
    --shadow: 0 24px 60px -28px rgba(0, 0, 0, .85);
    --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
            "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    color-scheme: dark;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

/* ---- Ảnh nền ------------------------------------------------------------ */
.backdrop {
    position: fixed; inset: 0; z-index: -1;
    background-image:
        linear-gradient(180deg, var(--veil-1) 0%, var(--veil-2) 58%, var(--veil-3) 92%),
        url("background.jpg");
    background-size: cover, cover;
    background-position: center, center 28%;
    background-repeat: no-repeat;
}
@media (max-width: 900px) {
    .backdrop {
        background-image:
            linear-gradient(180deg, var(--veil-1) 0%, var(--veil-2) 46%, var(--veil-3) 82%),
            url("background-sm.jpg");
    }
}

/* Chữ nằm trực tiếp trên ảnh cần một quầng tối/sáng rất nhẹ để luôn đọc được. */
.hero h1, .hero .lede { text-shadow: 0 2px 34px rgba(4, 6, 10, .92), 0 1px 6px rgba(4, 6, 10, .7); }

/* ---- Thanh trên --------------------------------------------------------- */
.topbar {
    display: flex; align-items: center; justify-content: space-between;
    width: 100%; max-width: 1080px; margin: 0 auto; padding: 20px 24px;
}
.brand {
    display: inline-flex; align-items: center; gap: 8px;
    height: 34px; padding: 0 13px 0 11px;
    border: 1px solid var(--line); border-radius: 9px;
    background: var(--panel); backdrop-filter: blur(10px);
    color: var(--text); text-decoration: none;
    font-weight: 600; font-size: 16px; letter-spacing: -.01em;
    transition: border-color .15s, background .15s;
}
.brand:hover { border-color: var(--line-2); background: var(--panel-2); }
.brand svg { opacity: .95; }
.topnav { display: flex; align-items: center; gap: 6px; }

.icon-btn, .ghost-btn, .lang-btn {
    height: 34px; border: 1px solid var(--line); background: var(--panel);
    color: var(--text); border-radius: 9px; cursor: pointer;
    font: 500 14.5px var(--font); text-decoration: none;
    display: inline-flex; align-items: center; justify-content: center;
    transition: color .15s, border-color .15s, background .15s;
    backdrop-filter: blur(10px);
}
.icon-btn { width: 34px; }
.ghost-btn, .lang-btn { padding: 0 12px; }
.lang-btn { font-variant: small-caps; letter-spacing: .04em; gap: 5px; }
.icon-btn:hover, .ghost-btn:hover, .lang-btn:hover {
    color: var(--text); border-color: var(--line-2); background: var(--panel-2);
}

/* ---- Bố cục ------------------------------------------------------------- */
.wrap { width: 100%; max-width: 720px; margin: 0 auto; padding: 20px 20px 64px; flex: 1; }

.hero { text-align: center; margin: 46px 0 34px; }
.hero h1 {
    margin: 0 0 12px;
    font-size: clamp(30px, 5vw, 44px); line-height: 1.12;
    font-weight: 600; letter-spacing: -.035em;
}
.hero h1 em { font-style: normal; color: rgba(255, 255, 255, .88); display: block; }
.lede { margin: 0 auto; max-width: 470px; color: var(--muted); font-size: 16.5px; }

/* ---- Vùng kéo thả ------------------------------------------------------- */
.dropzone {
    position: relative; padding: 46px 24px; text-align: center; cursor: pointer;
    border: 1px dashed var(--line-2); border-radius: 18px;
    background: var(--panel); backdrop-filter: blur(16px);
    transition: border-color .2s, background .2s, transform .2s;
}
.dropzone:hover { border-color: var(--accent); background: var(--panel-2); }
.dropzone:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; }
.dropzone.drag {
    border-color: var(--accent); background: var(--panel-2);
    transform: scale(1.008); box-shadow: 0 0 0 4px var(--accent-soft);
}
.dz-icon {
    width: 46px; height: 46px; margin: 0 auto 16px; border-radius: 13px;
    display: grid; place-items: center;
    color: var(--text); background: var(--panel-2);
    border: 1px solid var(--line);
}
.dz-title { margin: 0 0 4px; font-size: 17.5px; font-weight: 500; letter-spacing: -.01em; }
.dz-sub   { margin: 0 0 16px; color: var(--muted); font-size: 15.5px; }
.dz-sub .link { color: var(--text); text-decoration: underline; text-underline-offset: 3px;
                text-decoration-color: var(--line-2); }
.dz-meta  { margin: 0; color: var(--faint); font-size: 14px; }

/* ---- Tuỳ chọn ----------------------------------------------------------- */
.options {
    margin-top: 10px; border: 1px solid var(--line); border-radius: 12px;
    background: var(--panel); backdrop-filter: blur(16px); overflow: hidden;
}
.options summary {
    display: flex; align-items: center; gap: 8px; padding: 12px 15px;
    cursor: pointer; list-style: none; user-select: none;
    font-size: 15px; font-weight: 500; color: var(--muted);
}
.options summary::-webkit-details-marker { display: none; }
.options summary:hover { color: var(--text); }
.options summary svg { opacity: .7; }
.opt-summary { margin-left: auto; color: var(--faint); font-weight: 400; font-size: 14px; }
.opt-grid {
    display: grid; gap: 12px; padding: 2px 15px 16px;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}
.field { display: flex; flex-direction: column; gap: 5px; }
.field-label { font-size: 14px; color: var(--muted); font-weight: 500; }
.field-label small { color: var(--faint); font-weight: 400; }

select, input[type="password"], input[type="number"], input[type="text"] {
    width: 100%; height: 42px; padding: 0 12px;
    font: 400 15.5px var(--font); color: var(--text);
    background: var(--panel-2); border: 1px solid var(--line); border-radius: 9px;
    transition: border-color .15s, box-shadow .15s;
}
select:focus, input:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 38px; }
.pw-eye {
    position: absolute; right: 3px; top: 3px; width: 32px; height: 32px;
    display: grid; place-items: center; border: 0; border-radius: 7px;
    background: transparent; color: var(--faint); cursor: pointer;
}
.pw-eye:hover { color: var(--text); }

/* ---- Nút ---------------------------------------------------------------- */
.btn {
    height: 38px; padding: 0 15px; border-radius: 8px; border: 1px solid transparent;
    font: 500 14.5px var(--font); cursor: pointer; white-space: nowrap; text-decoration: none;
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    transition: filter .15s, background .15s, border-color .15s, transform .15s;
}
.btn-primary { background: var(--solid); color: var(--solid-ink); }
.btn-primary:hover { filter: brightness(.92); }
.btn-soft { background: var(--panel-2); border-color: var(--line); color: var(--text); }
.btn-soft:hover { border-color: var(--line-2); }
.btn-ghost { background: transparent; color: var(--muted); padding: 0 9px; }
.btn-ghost:hover { color: var(--text); background: var(--panel); }
.btn-danger { background: transparent; color: var(--danger); }
.btn-danger:hover { background: rgba(217, 138, 138, .12); }
.btn-lg { height: 44px; padding: 0 20px; font-size: 16px; border-radius: 9px; }
.btn.copied { background: var(--ok) !important; color: #0c1410 !important; }

/* ---- Hàng đợi ----------------------------------------------------------- */
.queue { margin-top: 16px; display: flex; flex-direction: column; gap: 8px; }
.qitem {
    display: flex; align-items: center; gap: 12px; padding: 12px 14px;
    border: 1px solid var(--line); border-radius: 12px;
    background: var(--card); backdrop-filter: blur(16px);
    animation: rise .25s ease;
}
@keyframes rise { from { opacity: 0; transform: translateY(6px); } }
.qthumb {
    width: 38px; height: 38px; flex: none; border-radius: 9px; overflow: hidden;
    display: grid; place-items: center;
    background: var(--panel-2); border: 1px solid var(--line);
    color: var(--muted); font: 600 10px var(--mono);
}
.qthumb img { width: 100%; height: 100%; object-fit: cover; }
.qbody { flex: 1; min-width: 0; }
.qname { font-size: 15px; font-weight: 500; white-space: nowrap; overflow: hidden;
         text-overflow: ellipsis; }
.qmeta { display: flex; gap: 7px; margin-top: 2px; font-size: 13.5px; color: var(--faint); }
.qmeta .err { color: var(--danger); }
.qbar { height: 3px; margin-top: 7px; border-radius: 99px; background: var(--panel-2);
        overflow: hidden; }
.qbar > i { display: block; height: 100%; width: 0; border-radius: 99px;
            background: var(--accent); transition: width .25s ease; }
.qpct { flex: none; font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.qitem.done .qpct { color: var(--ok); }
.qitem.error { border-color: rgba(217, 138, 138, .4); }

/* ---- Thẻ kết quả -------------------------------------------------------- */
.results { margin-top: 24px; }
.results-head {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    margin-bottom: 12px; flex-wrap: wrap;
}
.results-head h2 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -.015em; }
.results-actions { display: flex; gap: 6px; }

.card {
    padding: 16px; margin-bottom: 10px;
    border: 1px solid var(--line); border-radius: var(--radius);
    background: var(--card); backdrop-filter: blur(18px); box-shadow: var(--shadow);
    animation: rise .28s ease;
}
.card-top { display: flex; gap: 12px; align-items: flex-start; }
.card-thumb {
    width: 44px; height: 44px; flex: none; border-radius: 10px; overflow: hidden;
    display: grid; place-items: center;
    background: var(--panel-2); border: 1px solid var(--line);
    color: var(--muted); font: 600 10px var(--mono);
}
.card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.card-info { flex: 1; min-width: 0; }
.card-name { font-size: 15.5px; font-weight: 500; white-space: nowrap; overflow: hidden;
             text-overflow: ellipsis; }
.card-sub { margin-top: 2px; font-size: 14px; color: var(--faint); }
.card-qr {
    flex: none; width: 66px; height: 66px; padding: 5px; border-radius: 8px;
    background: #fff; display: grid; place-items: center;
}
.card-qr svg { display: block; width: 100%; height: 100%; }

.linkrow {
    display: flex; align-items: center; gap: 6px; margin-top: 12px; padding: 4px 4px 4px 12px;
    border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2);
}
.linkrow input {
    flex: 1; min-width: 0; height: 34px; padding: 0; border: 0; background: transparent;
    font: 500 15px var(--mono); color: var(--text);
}
.linkrow input:focus { outline: none; box-shadow: none; }
.card-foot { display: flex; align-items: center; gap: 2px; margin-top: 8px; }
.card-foot .spacer { flex: 1; }

/* ---- Dải thông tin dưới hero -------------------------------------------- */
.badges {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 6px;
    margin-top: 40px;
}
.badges span {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 11px; border-radius: 99px;
    border: 1px solid var(--line); background: var(--panel);
    color: var(--muted); font-size: 14px; backdrop-filter: blur(10px);
}
.badges svg { opacity: .55; }

/* ---- Chân trang --------------------------------------------------------- */
.foot {
    padding: 22px 20px; text-align: center;
    color: var(--muted); font-size: 14.5px;
    border-top: 1px solid var(--line);
    display: flex; flex-direction: column; gap: 3px; align-items: center;
}
.foot a { color: var(--text); text-decoration: none; font-weight: 500; }
.foot a:hover { opacity: .8; }
.foot .by { color: var(--muted); }

/* ---- Toast -------------------------------------------------------------- */
.toast {
    position: fixed; left: 50%; bottom: 24px; z-index: 99; max-width: 90vw;
    transform: translate(-50%, 14px); opacity: 0; pointer-events: none;
    padding: 12px 18px; border-radius: 10px; font-size: 15px;
    color: var(--text); background: var(--card); border: 1px solid var(--line-2);
    backdrop-filter: blur(18px); box-shadow: var(--shadow);
    transition: opacity .22s ease, transform .22s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.err { border-color: var(--danger); }

/* ==========================================================================
   Trang xem trước
   ========================================================================== */
.viewer { width: 100%; max-width: 840px; margin: 0 auto; padding: 16px 20px 56px; flex: 1; }
.vcard {
    border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
    background: var(--panel); backdrop-filter: blur(18px); box-shadow: var(--shadow);
}
.vhead { display: flex; align-items: center; gap: 12px; padding: 14px 16px;
         border-bottom: 1px solid var(--line); }
.vtitle { font-size: 16px; font-weight: 500; word-break: break-word; }
.vsub { margin-top: 2px; font-size: 14px; color: var(--faint); }

.vstage { display: grid; place-items: center; min-height: 200px; background: transparent; }
.vstage img, .vstage video { display: block; max-width: 100%; max-height: 66vh; }
.vstage audio { width: 90%; margin: 36px auto; }
.vstage iframe { width: 100%; height: 72vh; border: 0; background: #fff; }
.vstage pre {
    margin: 0; width: 100%; max-height: 66vh; overflow: auto; padding: 18px;
    font: 12.5px/1.65 var(--mono); color: var(--text); white-space: pre; tab-size: 4;
}
.vempty { padding: 52px 24px; text-align: center; color: var(--muted); font-size: 15.5px; }
.vempty .big-ico {
    width: 58px; height: 58px; margin: 0 auto 14px; border-radius: 15px;
    display: grid; place-items: center;
    background: var(--panel-2); border: 1px solid var(--line);
    color: var(--muted); font: 600 12px var(--mono);
}
.vfoot { display: flex; align-items: center; gap: 8px; padding: 14px 16px; flex-wrap: wrap; }
.vfoot .spacer { flex: 1; }

.vaside {
    display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 10px;
    padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px;
    background: var(--panel); backdrop-filter: blur(14px);
}
.vaside .qrbox { flex: none; width: 76px; height: 76px; padding: 6px;
                 border-radius: 9px; background: #fff; }
.vaside .qrbox svg { display: block; width: 100%; height: 100%; }
.vaside .qrtext { flex: 1; min-width: 190px; }
.vaside h4 { margin: 0 0 2px; font-size: 15px; font-weight: 500; }
.vaside p { margin: 0; font-size: 14px; color: var(--faint); }

/* Cổng mật khẩu + trang lỗi */
.gate, .err-page { max-width: 360px; margin: 12vh auto; text-align: center; }
.gate .lock {
    width: 52px; height: 52px; margin: 0 auto 18px; border-radius: 14px;
    display: grid; place-items: center;
    background: var(--panel-2); border: 1px solid var(--line); color: var(--text);
}
.gate h1, .err-page h1 { margin: 0 0 6px; font-size: 21px; font-weight: 600; letter-spacing: -.02em; }
.gate p, .err-page p { margin: 0 0 20px; color: var(--muted); font-size: 15.5px; }
.gate form { display: flex; flex-direction: column; gap: 8px; }
.gate input { height: 46px; text-align: center; font-size: 16px; letter-spacing: .08em; }
.gate .btn { height: 46px; font-size: 16px; }
.err-page .big { margin: 0 0 4px; font-size: 44px; opacity: .55; }
.alert {
    margin-bottom: 12px; padding: 11px 14px; border-radius: 9px; font-size: 14.5px;
    color: var(--danger); background: rgba(217, 138, 138, .1);
    border: 1px solid rgba(217, 138, 138, .3);
}
.alert.info { color: var(--text); background: var(--panel-2); border-color: var(--line-2); }

/* ==========================================================================
   Trang quản trị
   ========================================================================== */
.admin { width: 100%; max-width: 1080px; margin: 0 auto; padding: 16px 20px 56px; flex: 1; }
.stats { display: grid; gap: 10px; margin-bottom: 14px;
         grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.stat {
    padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px;
    background: var(--card); backdrop-filter: blur(16px);
}
.stat .k { font-size: 12.5px; font-weight: 600; letter-spacing: .07em;
           text-transform: uppercase; color: var(--faint); }
.stat .v { margin-top: 4px; font-size: 25px; font-weight: 600; letter-spacing: -.03em;
           font-variant-numeric: tabular-nums; }
.stat .s { font-size: 13.5px; color: var(--muted); }

.chart {
    padding: 16px; margin-bottom: 14px; border: 1px solid var(--line); border-radius: 12px;
    background: var(--card); backdrop-filter: blur(16px);
}
.chart h3 { margin: 0 0 14px; font-size: 14px; font-weight: 600; color: var(--muted); }
.bars { display: flex; align-items: flex-end; gap: 4px; height: 96px; }
.bars .b { flex: 1; height: 100%; display: flex; flex-direction: column;
           justify-content: flex-end; gap: 2px; }
.bars .b i { display: block; width: 100%; min-height: 2px; border-radius: 3px 3px 1px 1px; }
.bars .b i.up { background: var(--text); opacity: .8; }
.bars .b i.dl { background: var(--accent); opacity: .45; }
.bars .b:hover i { opacity: 1; }
.bars .b span { font-size: 9px; color: var(--faint); text-align: center; }

.table-wrap {
    border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
    background: var(--card); backdrop-filter: blur(16px);
}
.table-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
              padding: 12px 14px; border-bottom: 1px solid var(--line); }
.table-head h3 { flex: 1; margin: 0; font-size: 15.5px; font-weight: 600; }
.table-head input[type="text"] { width: 220px; height: 36px; font-size: 14px; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); }
th { font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
     color: var(--faint); }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--panel); }
td.num { font-variant-numeric: tabular-nums; }
.code-pill {
    padding: 2px 7px; border-radius: 5px; text-decoration: none;
    font: 500 13.5px var(--mono); color: var(--text);
    background: var(--panel-2); border: 1px solid var(--line);
}
.code-pill:hover { border-color: var(--line-2); }
.tag { padding: 2px 7px; border-radius: 4px; font-size: 11.5px;
       border: 1px solid var(--line); color: var(--faint); }
.tag.exp { color: var(--warn); border-color: rgba(210, 176, 113, .3); }
.tag.pw  { color: var(--accent); border-color: var(--line-2); }
.tname { max-width: 250px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pager { display: flex; justify-content: center; gap: 5px; padding: 12px; }
.pager a, .pager span {
    min-width: 30px; height: 30px; padding: 0 7px; border-radius: 7px;
    display: grid; place-items: center; font-size: 13.5px;
    color: var(--muted); text-decoration: none; border: 1px solid var(--line);
}
.pager a:hover { color: var(--text); border-color: var(--line-2); }
.pager .on { background: var(--solid); color: var(--solid-ink); border-color: var(--solid); }
.empty-row { padding: 36px 14px; text-align: center; color: var(--faint); }

@media (max-width: 640px) {
    .topbar { padding: 14px 16px; }
    .hero { margin: 28px 0 26px; }
    .dropzone { padding: 36px 18px; }
    .card-qr { display: none; }
    .hide-sm { display: none; }
    .vaside .qrbox { margin: 0 auto; }
}