/* ================================================================
   sherwinlaoshi.com —  Unified Styles
   Hub page + Pinyin tool + shared nav bar
   ================================================================ */

:root {
    --c-bg: #f8f9fb;
    --c-surface: #ffffff;
    --c-text: #1a1a2e;
    --c-text2: #6b7280;
    --c-text3: #9ca3af;
    --c-border: #e5e7eb;
    --c-border2: #f3f4f6;
    --c-primary: #4f46e5;
    --c-primary-h: #4338ca;
    --c-primary-l: #eef2ff;

    --t1: #ef4444;
    --t2: #22c55e;
    --t3: #3b82f6;
    --t4: #a855f7;
    --t5: #9ca3af;

    --r: 10px;
    --r-lg: 14px;
    --r-xl: 20px;
    --sh: 0 1px 3px rgba(0,0,0,.08);
    --sh-md: 0 4px 12px rgba(0,0,0,.06);
    --sh-lg: 0 10px 30px rgba(0,0,0,.08);
    --tf: .15s ease;
    --tr: .25s ease;
}

*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }

html { font-size:16px; -webkit-font-smoothing:antialiased; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
                 "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                 "Helvetica Neue", Arial, sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    min-height: 100vh;
}

/* ================================================================
   SHARED NAV BAR
   ================================================================ */
.site-nav {
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--c-text);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.01em;
}

.nav-logo img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.nav-links {
    display: flex;
    gap: 4px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--c-text2);
    font-size: .88rem;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 8px;
    transition: all var(--tf);
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    background: var(--c-primary-l);
    color: var(--c-primary);
}

/* ================================================================
   HUB PAGE (index.html)
   ================================================================ */
.hub {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 56px);
    padding: 40px 24px 60px;
    text-align: center;
}

.hub-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--sh-lg);
    margin-bottom: 20px;
    border: 3px solid var(--c-surface);
}

.hub-name {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--c-text);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.hub-tagline {
    font-size: .9rem;
    color: var(--c-text3);
    margin-bottom: 48px;
}

.hub-tools {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    max-width: 600px;
}

.hub-tool {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    transition: transform var(--tf);
}

.hub-tool:hover { transform: translateY(-3px); }

.hub-tool-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    box-shadow: var(--sh-md);
    transition: box-shadow var(--tr);
}

.hub-tool:hover .hub-tool-icon { box-shadow: var(--sh-lg); }

.hub-tool-icon.active-tool {
    background: var(--c-primary);
    color: #fff;
}

.hub-tool-icon.placeholder {
    background: var(--c-surface);
    border: 2px dashed var(--c-border);
    color: var(--c-text3);
    cursor: default;
}

.hub-tool-label {
    font-size: .78rem;
    font-weight: 500;
    color: var(--c-text2);
}

.hub-tool-label.active-label {
    color: var(--c-primary);
    font-weight: 600;
}

.hub-tool-label.placeholder-label {
    color: var(--c-text3);
}

/* ================================================================
   PINYIN TOOL (pinyin.html)
   ================================================================ */
.app {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

.hd {
    text-align: center;
    padding: 24px 0 20px;
}

.tt {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
}

.tt .cn { font-size: 1.8rem; font-weight: 700; letter-spacing: .04em; }

.tt .en {
    font-size: .82rem;
    font-weight: 400;
    color: var(--c-text2);
    text-transform: uppercase;
    letter-spacing: .02em;
}

.sub {
    margin-top: 8px;
    font-size: .9rem;
    color: var(--c-text3);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Card */
.card {
    background: var(--c-surface);
    border-radius: var(--r-lg);
    box-shadow: var(--sh);
    padding: 20px 22px;
    border: 1px solid var(--c-border2);
    transition: box-shadow var(--tr);
}

.card:hover { box-shadow: var(--sh-md); }

.lbl { font-size: .95rem; font-weight: 600; }

/* Input */
.in-card { margin-bottom: 8px; }

.in-hd {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.ta {
    width: 100%;
    border: 1.5px solid var(--c-border);
    border-radius: var(--r);
    padding: 14px 16px;
    font-size: 1.05rem;
    font-family: inherit;
    line-height: 1.7;
    color: var(--c-text);
    background: #f8f9fb;
    resize: vertical;
    min-height: 120px;
    transition: border-color var(--tr), box-shadow var(--tr);
}

.ta:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px var(--c-primary-l);
    background: var(--c-surface);
}

.ta::placeholder { color: var(--c-text3); opacity: .7; }

.in-ft {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 12px;
}

.cc { font-size: .82rem; color: var(--c-text3); }

/* Buttons */
.bt {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 9px 18px;
    border: none;
    border-radius: var(--r);
    font-size: .87rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
    transition: all var(--tf);
}

.bt:active { transform: scale(.97); }

.bp {
    background: var(--c-primary);
    color: #fff;
    box-shadow: 0 2px 4px rgba(79,70,229,.3);
}

.bp:hover {
    background: var(--c-primary-h);
    box-shadow: 0 4px 8px rgba(79,70,229,.35);
}

.bo {
    background: transparent;
    color: var(--c-text2);
    border: 1.5px solid var(--c-border);
}

.bo:hover {
    background: #f8f9fb;
    border-color: var(--c-text3);
    color: var(--c-text);
}

.sm {
    padding: 5px 11px;
    font-size: .8rem;
    border-radius: 6px;
}

.acts {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

/* Dict status */
.ds {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 4px 12px;
    font-size: .82rem;
    color: var(--c-text2);
}

.ds-bar {
    flex: 1;
    height: 6px;
    background: var(--c-border);
    border-radius: 3px;
    overflow: hidden;
}

.ds-fill {
    height: 100%;
    background: var(--t2);
    border-radius: 3px;
    transition: width .3s ease;
}

.ds-msg {
    flex-shrink: 0;
    max-width: 60%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Font slider */
.fs {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-right: 6px;
}

.fsl {
    font-size: .72rem;
    color: var(--c-text3);
    font-weight: 600;
}

.fsl-lg { font-size: .92rem; }

.fsr {
    -webkit-appearance: none;
    appearance: none;
    width: 80px;
    height: 5px;
    background: var(--c-border);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.fsr::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--c-primary);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(79,70,229,.3);
}

.fsr::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--c-primary);
    cursor: pointer;
    border: none;
}

.fsv {
    font-size: .78rem;
    font-weight: 600;
    min-width: 38px;
    text-align: center;
    user-select: none;
}

/* Tone toggle */
.tct {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: .78rem;
    color: var(--c-text2);
    cursor: pointer;
    user-select: none;
    margin-right: 4px;
}

.tct input { cursor: pointer; }

/* Tone legend */
.tl {
    font-size: .75rem;
    color: var(--c-text3);
    display: flex;
    align-items: center;
    gap: 2px;
}

.td {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 2px;
}

.td.t1 { background: var(--t1); }
.td.t2 { background: var(--t2); }
.td.t3 { background: var(--t3); }
.td.t4 { background: var(--t4); }
.td.t5 { background: var(--t5); }

/* Output */
.out-card { margin-bottom: 20px; }

.out-hd {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 8px;
}

.at {
    padding: 16px 6px;
    font-size: 1rem;
    line-height: 2.6;
    letter-spacing: .03em;
    color: var(--c-text);
    overflow-wrap: break-word;
}

/* Word group */
.wg {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    vertical-align: top;
    margin: 0 1px;
    cursor: pointer;
    position: relative;
    border-radius: 6px;
    padding: 1px 3px;
    transition: background var(--tf);
    user-select: none;
}

.wg:hover { background: var(--c-primary-l); }

.wg.on {
    background: #dbeafe;
    box-shadow: 0 0 0 2px var(--c-primary);
}

.wg .pinyin {
    font-size: .56em;
    line-height: 1.3;
    color: var(--c-text3);
    white-space: nowrap;
    letter-spacing: .02em;
    font-weight: 400;
}

.wg .hanzi {
    font-size: 1em;
    line-height: 1.3;
    font-weight: 500;
}

.wg .pinyin .t1 { color: var(--t1); }
.wg .pinyin .t2 { color: var(--t2); }
.wg .pinyin .t3 { color: var(--t3); }
.wg .pinyin .t4 { color: var(--t4); }
.wg .pinyin .t5 { color: var(--t5); }
.wg .pinyin .tn { color: var(--c-text); }

.oc { font-size: 1em; color: var(--c-text3); }
.oc.sp { display: inline; }

/* Empty state */
.es {
    text-align: center;
    padding: 50px 20px;
    color: var(--c-text3);
}

.es p { font-size: .95rem; margin-top: 12px; }
.es .eh { font-size: .8rem; opacity: .7; }

/* Popover */
.pop {
    position: fixed;
    z-index: 1000;
    background: var(--c-surface);
    border-radius: var(--r-lg);
    box-shadow: 0 20px 40px rgba(0,0,0,.12);
    border: 1px solid var(--c-border);
    padding: 16px 18px;
    min-width: 200px;
    max-width: 380px;
    max-height: 70vh;
    overflow-y: auto;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--tr), transform var(--tr);
    pointer-events: none;
}

.pop.on {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.ph {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.pw {
    font-size: 1.35rem;
    font-weight: 600;
    flex: 1;
}

.pa {
    display: flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
}

.ps, .pc {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--tf);
}

.ps { color: var(--c-primary); background: var(--c-primary-l); }

.ps:hover {
    background: #dbeafe;
    color: var(--c-primary-h);
    transform: scale(1.1);
}

.ps.spk {
    color: #fff;
    background: var(--c-primary);
    animation: sp .8s ease-in-out infinite;
}

@keyframes sp {
    0%,100% { box-shadow: 0 0 0 0 rgba(79,70,229,.4); }
    50% { box-shadow: 0 0 0 8px rgba(79,70,229,0); }
}

.pc { color: var(--c-text3); }

.pc:hover { background: var(--c-border2); color: var(--c-text); }

.pp {
    margin-top: 3px;
    font-size: .92rem;
    color: var(--c-primary);
    font-style: italic;
}

.pd {
    height: 1px;
    background: var(--c-border2);
    margin: 10px 0;
}

.defs { list-style: none; }

.di {
    padding: 2px 0;
    font-size: .87rem;
    color: var(--c-text2);
    line-height: 1.5;
}

.di::before {
    content: "•";
    color: var(--c-primary);
    margin-right: 7px;
    font-weight: bold;
}

.di.pl {
    font-weight: 600;
    color: var(--c-primary);
}

.di.pl::before { content: none; }

.pbd {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: transparent;
}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 768px) {
    .app { padding: 12px 10px 28px; }

    .hd { padding: 16px 0 14px; }
    .tt .cn { font-size: 1.4rem; }

    .card { padding: 16px 14px; }
    .ta { font-size: 1rem; min-height: 100px; }
    .at { font-size: 1rem; line-height: 2.4; padding: 12px 2px; }
    .wg .pinyin { font-size: .53em; }

    .in-ft { flex-direction: column; gap: 8px; align-items: stretch; }
    .in-ft .bt { justify-content: center; }
    .out-hd { flex-direction: column; align-items: flex-start; }

    .pop { max-width: calc(100vw - 24px); left: 12px !important; right: 12px !important; }
    .fsr { width: 60px; }

    /* Hub */
    .hub-avatar { width: 100px; height: 100px; }
    .hub-name { font-size: 1.35rem; }
    .hub-tools { gap: 16px; }
    .hub-tool-icon { width: 64px; height: 64px; font-size: 1.5rem; }
    .nav-inner { padding: 0 14px; }
}

@media (max-width: 480px) {
    .app { padding: 8px 6px 20px; }
    .hd { padding: 10px 0 8px; }
    .tt .cn { font-size: 1.2rem; }

    .card { padding: 12px 10px; border-radius: var(--r); }
    .ta { font-size: .92rem; padding: 10px 12px; min-height: 80px; }
    .at { font-size: .95rem; line-height: 2.2; }
    .wg { margin: 0; padding: 1px 2px; }
    .wg .pinyin { font-size: .5em; }
    .bt { padding: 7px 14px; font-size: .82rem; }
    .sm { padding: 4px 8px; font-size: .75rem; }

    .pop {
        max-width: 100vw;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        border-radius: 16px 16px 0 0;
        padding: 16px;
        max-height: 55vh;
    }
    .pw { font-size: 1.15rem; }
    .tl { font-size: .7rem; }

    /* Hub */
    .hub-avatar { width: 88px; height: 88px; }
    .hub-name { font-size: 1.2rem; }
    .hub-tagline { font-size: .82rem; margin-bottom: 36px; }
    .hub-tools { gap: 14px; }
    .hub-tool-icon { width: 56px; height: 56px; font-size: 1.3rem; }
    .hub-tool-label { font-size: .72rem; }
    .nav-inner { height: 52px; padding: 0 10px; }
    .nav-links a { font-size: .8rem; padding: 6px 10px; }
}