/* ====================================================
   润墨仿写 · 新视觉设计 v2.0
   Dark / Light dual theme · Glass morphism · Glow
   ==================================================== */

/* ===== CSS Variables – Dark Mode (default) ===== */
:root {
    --bg:           #0c0f1a;
    --bg-card:      rgba(16, 22, 38, 0.82);
    --bg-nav:       rgba(12, 15, 26, 0.88);
    --bg-input:     rgba(10, 13, 24, 0.65);
    --bg-secondary: rgba(22, 30, 50, 0.75);
    --primary:      #818cf8;
    --primary-s:    #6366f1;
    --primary-h:    #4f46e5;
    --text-1:       #f1f5f9;
    --text-2:       #94a3b8;
    --text-3:       #64748b;
    --border:       rgba(129,140,248,0.18);
    --border-base:  rgba(255,255,255,0.07);
    --success:      #10b981;
    --error:        #ef4444;
    --warning:      #f59e0b;
    --radius:       14px;
    --radius-sm:    8px;
    --glow:         129,140,248;
    --grad1:        rgba(129,140,248,0.12);
    --grad2:        rgba(167,139,250,0.09);
    --glass-bg:     rgba(16,22,38,0.78);
    --glass-b:      rgba(129,140,248,0.2);
    --shadow-glow:  0 0 40px rgba(129,140,248,0.12);
}

/* ===== CSS Variables – Light Mode ===== */
html.light {
    --bg:           #f0f4ff;
    --bg-card:      rgba(255,255,255,0.88);
    --bg-nav:       rgba(255,255,255,0.88);
    --bg-input:     rgba(245,247,255,0.8);
    --bg-secondary: rgba(238,242,255,0.8);
    --primary:      #6366f1;
    --primary-s:    #4f46e5;
    --primary-h:    #4338ca;
    --text-1:       #1e293b;
    --text-2:       #475569;
    --text-3:       #94a3b8;
    --border:       rgba(99,102,241,0.18);
    --border-base:  rgba(0,0,0,0.07);
    --glow:         99,102,241;
    --grad1:        rgba(99,102,241,0.08);
    --grad2:        rgba(139,92,246,0.06);
    --glass-bg:     rgba(255,255,255,0.85);
    --glass-b:      rgba(99,102,241,0.18);
    --shadow-glow:  0 0 30px rgba(99,102,241,0.1);
}

/* ===== Reset ===== */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { transition: background-color .3s, color .3s; }
body {
    font-family: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text-1);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* ===== Orb Float Animations ===== */
@keyframes orb-float-0 {
    0%,100%{ opacity:.15; transform:translate(-50%,-50%) scale(1); }
    33%    { opacity:.28; transform:translate(-40%,-60%) scale(1.2); }
    66%    { opacity:.10; transform:translate(-60%,-40%) scale(.9); }
}
@keyframes orb-float-1 {
    0%,100%{ opacity:.12; transform:translate(-50%,-50%) scale(1); }
    50%    { opacity:.24; transform:translate(-30%,-70%) scale(1.3); }
}
@keyframes orb-float-2 {
    0%,100%{ opacity:.18; transform:translate(-50%,-50%) scale(1.1); }
    25%    { opacity:.08; transform:translate(-70%,-30%) scale(.8); }
    75%    { opacity:.22; transform:translate(-35%,-65%) scale(1.25); }
}
.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    pointer-events: none;
}

/* ===== Animated Background ===== */
.bg-layer {
    position: fixed; inset: 0;
    pointer-events: none; z-index: 0;
}
.bg-gradient {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, var(--grad1), transparent),
        radial-gradient(ellipse 60% 40% at 100% 100%, var(--grad2), transparent),
        radial-gradient(ellipse 40% 30% at 0% 80%, var(--grad1), transparent);
    animation: grad-move 15s ease-in-out infinite;
}
@keyframes grad-move {
    0%,100% { opacity:.8; transform:scale(1); }
    50%      { opacity:1;  transform:scale(1.04); }
}
.bg-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(var(--glow),.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(var(--glow),.055) 1px, transparent 1px);
    background-size: 50px 50px;
}
#particles-canvas {
    position: fixed; inset: 0;
    pointer-events: none; z-index: 0;
}

/* ===== App Wrapper ===== */
.app-wrapper {
    position: relative; z-index: 1;
    display: flex; flex-direction: column;
    min-height: 100vh;
}

/* ===== Glass card ===== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    border: 1px solid var(--glass-b);
}

/* ===== Navbar ===== */
.navbar {
    position: sticky; top: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 28px; height: 64px;
    border-bottom: 1px solid var(--border);
    transition: background .3s;
}
.nav-left  { display:flex; align-items:center; gap:32px; }
.nav-right { display:flex; align-items:center; gap:8px; }

/* Brand */
.nav-brand-wrap {
    display:flex; align-items:center; gap:9px; cursor:default;
}
.brand-icon-wrap {
    position:relative; width:32px; height:32px;
    display:flex; align-items:center; justify-content:center;
}
.brand-icon { color: var(--primary); transition: transform .3s; }
.nav-brand-wrap:hover .brand-icon { transform: scale(1.15) rotate(8deg); }
.brand-glow {
    position:absolute; inset:0; border-radius:50%;
    background: var(--primary); opacity:0; filter:blur(10px);
    transition: opacity .3s;
}
.nav-brand-wrap:hover .brand-glow { opacity:.3; }
.nav-brand {
    font-size:18px; font-weight:700;
    color:var(--text-1); letter-spacing:.5px;
}

/* Nav links */
.nav-links { display:flex; gap:4px; }
.nav-item {
    position:relative; padding:6px 16px;
    text-decoration:none; color:var(--text-2);
    font-size:14px; font-weight:500;
    transition: color .2s;
}
.nav-item::after {
    content:''; position:absolute;
    bottom:0; left:0; width:0; height:2px;
    background:var(--primary); border-radius:2px;
    transition: width .2s;
}
.nav-item:hover       { color:var(--text-1); }
.nav-item:hover::after { width:100%; }
.nav-item.active      { color:var(--primary); }
.nav-item.active::after { width:100%; }

/* Nav buttons */
.nav-btn {
    padding:6px 16px; border-radius:8px;
    text-decoration:none; color:var(--text-2);
    font-size:13px; font-weight:500;
    border:1px solid transparent; background:transparent; cursor:pointer;
    transition: all .2s;
}
.nav-btn:hover {
    color:var(--text-1);
    background:rgba(var(--glow),.08);
    border-color:var(--border);
}
.login-btn {
    background:var(--primary-s) !important;
    color:#fff !important;
    border-color:var(--primary-s) !important;
}
.login-btn:hover {
    background:var(--primary-h) !important;
    border-color:var(--primary-h) !important;
    box-shadow:0 4px 16px rgba(var(--glow),.4) !important;
}

/* Theme toggle pill */
.theme-btn {
    display: flex; align-items: center; gap: 7px;
    padding: 5px 12px 5px 6px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    cursor: pointer; color: var(--text-2);
    font-size: 12px; font-weight: 500;
    transition: all .2s;
    white-space: nowrap;
}
.theme-btn:hover { color: var(--text-1); border-color: rgba(var(--glow),.4); background: rgba(var(--glow),.1); }
.toggle-track {
    width: 30px; height: 17px; border-radius: 999px;
    background: var(--primary-s);
    position: relative; flex-shrink: 0;
    transition: background .3s;
}
.toggle-thumb {
    position: absolute; width: 13px; height: 13px; border-radius: 50%;
    background: #fff; top: 2px; left: 2px;
    transition: transform .3s cubic-bezier(.34,1.56,.64,1);
    box-shadow: 0 1px 4px rgba(0,0,0,.25);
}
html.light .toggle-thumb { transform: translateX(13px); }
html.light .toggle-track  { background: var(--primary-s); }

/* ===== User Status Bar ===== */
.user-info-bar {
    display:flex; align-items:center; gap:16px;
    padding:8px 28px;
    background:rgba(var(--glow),.05);
    border-bottom:1px solid var(--border);
    font-size:13px; color:var(--text-2);
}
.card-code-label { font-family:monospace; font-size:13px; color:var(--text-2); }
.credits-badge {
    background:linear-gradient(135deg,#f59e0b,#f97316);
    color:#fff; padding:2px 10px;
    border-radius:12px; font-weight:600; font-size:12px;
}
.logout-btn {
    margin-left:auto; padding:4px 14px;
    border:1px solid var(--border); border-radius:16px;
    background:transparent; color:var(--text-2);
    font-size:12px; cursor:pointer; transition: all .2s;
}
.logout-btn:hover { border-color:var(--error); color:var(--error); }

/* ===== Subtitle Section ===== */
.subtitle-section {
    text-align:center; padding:32px 20px 16px;
    animation: fade-up .5s ease-out;
}
.feature-badges {
    display:flex; align-items:center; justify-content:center;
    gap:20px; margin-bottom:16px; flex-wrap:wrap;
}
.feature-badge {
    display:flex; align-items:center; gap:8px;
    font-size:14px; color:var(--text-2);
    transition: color .2s;
}
.feature-badge:hover { color:var(--text-1); }
.badge-icon {
    padding:6px; border-radius:8px;
    background:rgba(var(--glow),.1);
    color:var(--primary);
    display:flex; align-items:center; justify-content:center;
    transition: background .2s;
}
.feature-badge:hover .badge-icon { background:rgba(var(--glow),.2); }
.feature-dot {
    width:4px; height:4px; border-radius:50%;
    background:var(--text-3); opacity:.5;
}
.version-badge {
    display:inline-flex; align-items:center; gap:6px;
    border-radius:999px;
    background:rgba(245,158,11,.1);
    border:1px solid rgba(245,158,11,.25);
    padding:7px 20px; font-size:15px; font-weight:600; color:#f59e0b;
    position:relative; overflow:hidden;
}
.version-badge::after {
    content:''; position:absolute;
    top:0; left:-100%; right:-100%; bottom:0;
    background:linear-gradient(90deg,transparent,rgba(245,158,11,.3),transparent);
    animation: shimmer 3s linear infinite;
}
/* Keep old subtitle class for backward compat */
.subtitle { font-size:14px; color:var(--text-2); }

/* ===== Main Content ===== */
.main-content {
    flex:1; padding:16px 28px 24px;
    max-width:1400px; width:100%; margin:0 auto;
}
.panel-container {
    display:grid; grid-template-columns:1fr 1fr;
    gap:20px; margin-bottom:28px;
}

/* ===== Panels ===== */
.panel {
    border-radius:var(--radius);
    display:flex; flex-direction:column; overflow:hidden;
    transition: transform .3s ease, box-shadow .3s ease;
}
.panel:hover {
    transform:translateY(-3px);
    box-shadow:0 10px 36px rgba(var(--glow),.18);
}
.panel-header {
    padding:14px 18px;
    border-bottom:1px solid var(--border);
}
.panel-header h3 {
    font-size:14px; font-weight:600; color:var(--text-1);
}
.panel-dot {
    width:8px; height:8px; border-radius:50%;
    background:var(--primary);
    animation: pulse-dot 2s ease-in-out infinite;
}
.text-area {
    padding:16px 18px;
    font-size:14px; line-height:1.85;
    color:var(--text-1); resize:none; border:none; outline:none;
    min-height:380px; font-family:inherit; background:transparent;
    transition: background .2s;
}
.input-area { width:100%; }
.input-area::placeholder { color:var(--text-3); }
.input-area:focus { background:rgba(var(--glow),.025); }
.output-area {
    white-space:pre-wrap; word-break:break-word; overflow-y:auto;
    resize:none; border:none; outline:none; background:transparent;
    color:var(--text-1); font-family:inherit; font-size:inherit;
    width:100%; line-height:inherit;
}
.placeholder-text {
    color:var(--text-3); font-style:italic; font-size:14px;
}
.panel-footer {
    display:flex; justify-content:space-between; align-items:center;
    padding:10px 18px; border-top:1px solid var(--border);
}
.char-count  { font-size:12px; color:var(--text-3); }
.output-info { font-size:12px; color:var(--text-3); }

/* ===== Mode Toggle ===== */
.mode-toggle {
    display:flex; align-items:center; gap:3px;
    background:rgba(var(--glow),.07);
    border:1px solid var(--border);
    border-radius:999px; padding:3px;
}
.mode-btn {
    padding:5px 16px; border:none; border-radius:999px;
    font-size:12px; cursor:pointer;
    background:transparent; color:var(--text-3);
    font-weight:500; transition: all .2s; white-space:nowrap;
}
.mode-btn.active {
    background:var(--primary-s); color:#fff;
    box-shadow:0 2px 8px rgba(var(--glow),.35);
}
.mode-btn:hover:not(.active) { color:var(--text-1); }

/* ===== Buttons ===== */
.btn {
    padding:7px 14px;
    border:1px solid transparent; border-radius:var(--radius-sm);
    font-size:13px; font-weight:500; cursor:pointer;
    transition: all .2s;
    display:inline-flex; align-items:center; gap:5px;
    color:var(--text-2); background:transparent;
}
.btn:disabled { opacity:.5; cursor:not-allowed; }
.btn:hover:not(:disabled) {
    color:var(--text-1);
    background:rgba(var(--glow),.08);
    border-color:var(--border);
}
.btn-primary {
    background:var(--primary-s); color:#fff;
    border-color:var(--primary-s);
    box-shadow:0 2px 12px rgba(var(--glow),.3);
}
.btn-primary:hover:not(:disabled) {
    background:var(--primary-h); border-color:var(--primary-h);
    transform:translateY(-1px);
    box-shadow:0 4px 18px rgba(var(--glow),.45);
    color:#fff;
}
.btn-secondary {
    background:rgba(var(--glow),.06);
    color:var(--text-2); border-color:var(--border);
}
.btn-secondary:hover:not(:disabled) {
    background:rgba(var(--glow),.12); color:var(--text-1);
}
#btn-feedback {
    background: rgba(16, 185, 129, .08);
    color: #6ee7b7;
    border-color: rgba(16, 185, 129, .3);
}
#btn-feedback:hover:not(:disabled) {
    background: rgba(16, 185, 129, .14);
    color: #d1fae5;
    border-color: rgba(16, 185, 129, .5);
}
html.light #btn-feedback {
    background: rgba(5, 150, 105, .1);
    color: #065f46;
    border-color: rgba(5, 150, 105, .28);
}
html.light #btn-feedback:hover:not(:disabled) {
    background: rgba(5, 150, 105, .16);
    color: #064e3b;
    border-color: rgba(5, 150, 105, .42);
}
.btn-stop {
    color:var(--error);
    border-color:rgba(239,68,68,.3);
    background:rgba(239,68,68,.06);
}
.btn-stop:hover { background:rgba(239,68,68,.12); border-color:var(--error); }
#btn-zhuque-detect {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.26), rgba(249, 115, 22, 0.18));
    color: #fde68a;
    border: 1px solid rgba(251, 191, 36, 0.65);
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.18);
}
#btn-zhuque-detect:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.38), rgba(249, 115, 22, 0.28));
    color: #fff7d6;
    border-color: rgba(251, 191, 36, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.28);
}
html.light #btn-zhuque-detect {
    background: linear-gradient(135deg, #92400e, #b45309);
    color: #fff7d6;
    border: 1px solid #78350f;
    box-shadow: 0 6px 16px rgba(146, 64, 14, 0.18);
}
html.light #btn-zhuque-detect:hover:not(:disabled) {
    background: linear-gradient(135deg, #7c2d12, #9a3412);
    color: #ffffff;
    border-color: #7c2d12;
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(124, 45, 18, 0.24);
}
.btn-full {
    width:100%; padding:12px; font-size:14px;
    border-radius:10px; justify-content:center;
}

/* ===== Action Buttons ===== */
.action-buttons {
    display:flex; justify-content:center; gap:16px;
}
.btn-large {
    padding:14px 48px; font-size:15px;
    font-weight:600; border-radius:999px;
    height:52px; letter-spacing:.5px;
}
#btn-polish, #btn-imitate {
    background:var(--primary-s); color:#fff;
    border:1px solid var(--primary-s);
    box-shadow:0 4px 22px rgba(var(--glow),.38);
    position:relative; overflow:hidden;
}
#btn-polish::before, #btn-imitate::before {
    content:''; position:absolute; inset:0;
    background:linear-gradient(90deg,transparent,rgba(255,255,255,.18),transparent);
    transform:translateX(-100%); transition:transform .65s;
}
#btn-polish:hover::before, #btn-imitate:hover::before { transform:translateX(100%); }
#btn-polish:hover:not(:disabled), #btn-imitate:hover:not(:disabled) {
    background:var(--primary-h); border-color:var(--primary-h);
    transform:translateY(-2px); color:#fff;
    box-shadow:0 7px 28px rgba(var(--glow),.55);
}
#btn-history {
    background:rgba(var(--glow),.08); color:var(--text-2);
    border:1px solid var(--border);
}
#btn-history:hover {
    background:rgba(var(--glow),.14); color:var(--text-1);
    transform:translateY(-2px);
    box-shadow:0 4px 16px rgba(var(--glow),.15);
}

/* ===== Progress Bar ===== */
.progress-wrap {
    display:flex; align-items:center; gap:10px;
    padding:8px 18px; border-bottom:1px solid var(--border);
    background:rgba(var(--glow),.03);
}
.progress-bar-bg {
    flex:1; height:4px; background:var(--border);
    border-radius:99px; overflow:hidden;
}
.progress-bar-fill {
    height:100%;
    background:linear-gradient(90deg,var(--primary-s),var(--primary));
    border-radius:99px; transition:width .4s ease;
    box-shadow:0 0 8px rgba(var(--glow),.5);
}
.progress-label {
    font-size:11px; font-weight:600; color:var(--primary);
    min-width:28px; text-align:right;
}

/* ===== Indicators ===== */
.stage-indicator {
    font-size:12px; font-weight:500; color:var(--primary);
    background:rgba(var(--glow),.1);
    border:1px solid rgba(var(--glow),.22);
    padding:3px 10px; border-radius:12px; white-space:nowrap;
}
.cooking-indicator {
    font-size:12px; font-weight:500; color:var(--primary);
    background:rgba(var(--glow),.1);
    padding:3px 10px; border-radius:12px; white-space:nowrap;
    animation: fade-up .3s ease;
}

/* ===== Processing Dots ===== */
.processing-dots { display:none; gap:3px; align-items:center; }
.processing-dots.active { display:inline-flex; }
.processing-dots span {
    width:5px; height:5px; background:var(--primary);
    border-radius:50%; animation:dot-bounce 1.4s ease-in-out infinite;
}
.processing-dots span:nth-child(2) { animation-delay:.2s; }
.processing-dots span:nth-child(3) { animation-delay:.4s; }
@keyframes dot-bounce {
    0%,60%,100% { transform:translateY(0); opacity:.3; }
    30%          { transform:translateY(-4px); opacity:1; }
}

/* ===== Spinner ===== */
.loading-spinner {
    display:inline-block; width:16px; height:16px;
    border:2px solid rgba(255,255,255,.25);
    border-top-color:#fff; border-radius:50%;
    animation:spin .6s linear infinite;
}
@keyframes spin { to { transform:rotate(360deg); } }

/* ===== History Panel ===== */
.history-panel {
    max-width:1400px; margin:0 auto 16px;
    padding:0 28px; animation:fade-up .3s ease;
}
.history-header {
    display:flex; justify-content:space-between; align-items:center;
    padding:12px 18px;
    background:rgba(var(--glow),.08);
    border:1px solid var(--border);
    border-radius:var(--radius) var(--radius) 0 0;
    font-weight:600; font-size:14px; color:var(--primary);
}
.history-close {
    background:none; border:none; cursor:pointer;
    color:var(--text-3); font-size:16px; padding:2px 8px;
    transition:color .2s;
}
.history-close:hover { color:var(--text-1); }
.history-list {
    background:rgba(var(--glow),.03);
    border:1px solid var(--border); border-top:none;
    border-radius:0 0 var(--radius) var(--radius);
    padding:12px 16px; max-height:320px;
    overflow-y:auto; display:flex; flex-direction:column; gap:10px;
}
.history-item {
    padding:10px 14px;
    background:var(--glass-bg);
    border-radius:var(--radius-sm);
    border:1px solid var(--border);
    transition:border-color .2s, background .2s;
}
.history-item:hover {
    border-color:rgba(var(--glow),.38);
    background:rgba(var(--glow),.06);
}
.history-item-meta {
    display:flex; gap:12px; align-items:center; font-size:12px;
}

/* ===== Modals ===== */
.modal-overlay {
    position:fixed; inset:0;
    background:rgba(0,0,0,.65);
    display:flex; align-items:center; justify-content:center;
    z-index:1000;
    backdrop-filter:blur(8px);
    -webkit-backdrop-filter:blur(8px);
}
.modal {
    background:var(--bg-card);
    backdrop-filter:blur(24px);
    -webkit-backdrop-filter:blur(24px);
    border:1px solid var(--glass-b);
    border-radius:18px; width:420px; max-width:93vw;
    box-shadow:0 24px 64px rgba(0,0,0,.45), var(--shadow-glow);
    animation:modal-in .25s ease;
    position:relative; overflow:hidden;
}
.modal::before {
    content:''; position:absolute;
    top:-70px; right:-70px;
    width:180px; height:180px;
    background:rgba(var(--glow),.15);
    border-radius:50%; filter:blur(50px);
    pointer-events:none;
}
.modal::after {
    content:''; position:absolute;
    bottom:-60px; left:-60px;
    width:140px; height:140px;
    background:rgba(var(--glow),.1);
    border-radius:50%; filter:blur(35px);
    pointer-events:none;
}
@keyframes modal-in {
    from { opacity:0; transform:translateY(-18px) scale(.97); }
    to   { opacity:1; transform:translateY(0)    scale(1); }
}
.modal-header {
    display:flex; justify-content:space-between; align-items:center;
    padding:22px 24px 0; position:relative;
}
.modal-header h2 {
    font-size:18px; font-weight:600; color:var(--text-1);
    display:flex; align-items:center; gap:10px;
}
.modal-icon {
    width:38px; height:38px; border-radius:10px;
    background:rgba(var(--glow),.12); color:var(--primary);
    display:flex; align-items:center; justify-content:center;
}
.modal-close {
    background:none; border:none; font-size:22px;
    color:var(--text-3); cursor:pointer; padding:4px 8px;
    line-height:1; border-radius:6px; transition:all .2s;
}
.modal-close:hover {
    color:var(--text-1); background:rgba(var(--glow),.08);
}
.modal-body { padding:20px 24px 26px; position:relative; }
.form-group  { margin-bottom:16px; }
.form-group label {
    display:block; font-size:12px; font-weight:500;
    color:var(--text-2); margin-bottom:8px;
}
.form-group input {
    width:100%; padding:11px 14px;
    border:1px solid var(--border); border-radius:10px;
    font-size:15px; outline:none; transition:all .2s;
    font-family:monospace; text-align:center; letter-spacing:3px;
    background:rgba(var(--glow),.05); color:var(--text-1);
}
.form-group input:focus {
    border-color:var(--primary-s);
    box-shadow:0 0 0 3px rgba(var(--glow),.18);
    background:rgba(var(--glow),.08);
}
.form-group input::placeholder { color:var(--text-3); letter-spacing:1px; }
.error-msg {
    color:var(--error); font-size:12px;
    margin-bottom:12px; min-height:18px;
}

/* ===== Toast ===== */
.toast {
    position:fixed; top:80px; left:50%;
    transform:translateX(-50%);
    background:rgba(20,28,48,.95);
    backdrop-filter:blur(14px);
    color:#fff; padding:11px 24px;
    border-radius:999px; font-size:14px;
    border:1px solid var(--border);
    box-shadow:0 8px 32px rgba(0,0,0,.35);
    z-index:2000; animation:toast-in .3s ease; white-space:nowrap;
}
.toast.error   { border-color:rgba(239,68,68,.4);   background:rgba(50,15,15,.95); }
.toast.success { border-color:rgba(16,185,129,.4);  background:rgba(8,35,25,.95); color:#4ade80; }
.toast.warning { border-color:rgba(245,158,11,.4);  background:rgba(40,28,8,.95); color:#fbbf24; }

html.light .toast         { background:rgba(255,255,255,.97); color:#1e293b; border-color:rgba(99,102,241,.25); box-shadow:0 8px 32px rgba(0,0,0,.12); }
html.light .toast.error   { background:rgba(255,240,240,.97); color:#dc2626; border-color:rgba(239,68,68,.35); }
html.light .toast.success { background:rgba(236,253,245,.97); color:#059669; border-color:rgba(16,185,129,.35); }
html.light .toast.warning { background:rgba(255,251,235,.97); color:#b45309; border-color:rgba(245,158,11,.35); }

/* ===== 文章类型选择弹窗 ===== */
.article-type-overlay {
    display:none; position:fixed; inset:0;
    background:rgba(0,0,0,.65); z-index:2100;
    align-items:center; justify-content:center;
    backdrop-filter:blur(6px);
}
.article-type-box {
    background:#1e293b; border:1px solid #334155;
    border-radius:18px; padding:32px 28px;
    max-width:340px; width:90%; text-align:center;
    box-shadow:0 24px 48px rgba(0,0,0,.5);
}
.article-type-title { font-size:15px; font-weight:700; color:#f1f5f9; margin-bottom:8px; }
.article-type-sub   { font-size:13px; color:#94a3b8; margin-bottom:24px; }
.article-type-btns  { display:flex; flex-direction:column; gap:12px; }
.article-type-btn   { padding:12px; border-radius:10px; font-size:14px; font-weight:600; cursor:pointer; }
.btn-digital   { border:1px solid #4f46e5; background:#312e81; color:#c7d2fe; }
.btn-emotional { border:1px solid #be185d; background:#831843; color:#fbcfe8; }
.btn-skip      { border:1px solid #334155; background:transparent; color:#64748b; font-size:14px; font-weight:400; }

html.light .article-type-box    { background:#ffffff; border-color:rgba(99,102,241,.2); box-shadow:0 24px 48px rgba(0,0,0,.15); }
html.light .article-type-title  { color:#1e293b; }
html.light .article-type-sub    { color:#64748b; }
html.light .btn-digital          { background:#ede9fe; border-color:#6366f1; color:#4338ca; }
html.light .btn-emotional        { background:#fce7f3; border-color:#ec4899; color:#9d174d; }
html.light .btn-skip             { border-color:#e2e8f0; color:#94a3b8; }
html.light .article-type-tips   { background:rgba(99,102,241,.06); border-color:rgba(99,102,241,.15); }
html.light .article-type-tips-title { color:#4338ca; }
html.light .article-type-tips-list  { color:#475569; }

.article-type-body {
    display:flex; gap:20px; align-items:flex-start;
}
.article-type-btns {
    display:flex; flex-direction:column; gap:12px; flex-shrink:0; min-width:150px;
}
.article-type-tips {
    padding:14px 16px; flex:1;
    background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.1);
    border-radius:12px; text-align:left;
}
.article-type-tips-title {
    font-size:14px; font-weight:700; color:#a5b4fc;
    margin-bottom:10px; letter-spacing:.5px;
}
.article-type-tips-list {
    margin:0; padding-left:18px;
    font-size:14px; color:#94a3b8; line-height:1.8;
}
.article-type-tips-list li + li { margin-top:4px; }

.article-type-box {
    overflow-y:auto; max-height:90vh; max-width:620px;
    position:relative;
}
.article-type-close {
    position:absolute; top:12px; right:14px;
    background:none; border:none; cursor:pointer;
    color:#64748b; font-size:18px; line-height:1;
    padding:4px 6px; border-radius:6px;
    transition:color .15s, background .15s;
}
.article-type-close:hover { color:#f1f5f9; background:rgba(255,255,255,.1); }
html.light .article-type-close:hover { color:#1e293b; background:rgba(0,0,0,.07); }
@keyframes toast-in {
    from { opacity:0; transform:translate(-50%,-12px); }
    to   { opacity:1; transform:translate(-50%,0); }
}

/* ===== Footer ===== */
.footer {
    text-align:center; padding:20px;
    color:var(--text-3); font-size:12px;
    border-top:1px solid var(--border); margin-top:auto;
}

/* ===== Animations ===== */
@keyframes fade-up {
    from { opacity:0; transform:translateY(12px); }
    to   { opacity:1; transform:translateY(0); }
}
@keyframes shimmer {
    0%   { transform:translateX(-100%); }
    100% { transform:translateX(100%); }
}
@keyframes pulse-dot {
    0%,100% { opacity:.5; transform:scale(1); }
    50%      { opacity:1;  transform:scale(1.18); }
}

/* ===== Panel Resize Handle ===== */
.panel-text-wrap {
    position: relative;
    flex: none;
    display: flex;
    flex-direction: column;
    height: 380px;
    min-height: 380px;
    overflow: hidden;
}
.panel-text-wrap > .text-area {
    flex: none;
    height: 100%;
    min-height: 0;
}
.resize-handle {
    position: absolute;
    bottom: 6px; right: 6px;
    width: 22px; height: 22px;
    cursor: ns-resize;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-3);
    border-radius: 5px;
    transition: color .2s, background .2s;
    z-index: 10;
    user-select: none;
    -webkit-user-select: none;
}
.resize-handle:hover    { color: var(--primary); background: rgba(var(--glow),.12); }
.resize-handle.dragging { color: var(--primary); background: rgba(var(--glow),.18); }

/* ===== 强化降AI 引导 ===== */
@keyframes enhance-pulse {
    0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,.55), 0 2px 12px rgba(239,68,68,.2); }
    55%     { box-shadow: 0 0 0 7px rgba(239,68,68,0),  0 2px 16px rgba(239,68,68,.35); }
}
@keyframes nudge-in {
    from { opacity:0; transform:translateY(10px); }
    to   { opacity:1; transform:translateY(0); }
}
.btn-enhance {
    animation: enhance-pulse 2s ease-in-out infinite;
    background: linear-gradient(135deg, rgba(239,68,68,.18), rgba(239,68,68,.08)) !important;
    border: 1px solid rgba(239,68,68,.6) !important;
    color: #f87171 !important;
    font-weight: 600 !important;
    font-size: 13px !important;
    padding: 5px 14px !important;
    gap: 5px;
    white-space: nowrap;
}
.btn-enhance:hover {
    background: linear-gradient(135deg, rgba(239,68,68,.28), rgba(239,68,68,.16)) !important;
    transform: scale(1.05);
}
#enhance-nudge {
    display: none;
    margin: 0 16px 10px;
    padding: 11px 15px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(239,68,68,.11), rgba(239,68,68,.05));
    border: 1px solid rgba(239,68,68,.38);
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    animation: nudge-in .35s ease;
    flex-shrink: 0;
}
#enhance-nudge.show { display: flex; }
#enhance-nudge .nudge-text {
    font-size: 13px;
    color: var(--text-2);
    line-height: 1.5;
}
#enhance-nudge .nudge-text strong { color: #f87171; }
#enhance-nudge .btn-nudge-go {
    flex-shrink: 0;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    border: none !important;
    color: #fff !important;
    font-weight: 700 !important;
    font-size: 13px !important;
    padding: 6px 16px !important;
    border-radius: 8px;
    cursor: pointer;
    white-space: nowrap;
    transition: transform .15s, box-shadow .15s;
    box-shadow: 0 2px 10px rgba(239,68,68,.4);
}
#enhance-nudge .btn-nudge-go:hover { transform: scale(1.04); box-shadow: 0 3px 14px rgba(239,68,68,.55); }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width:5px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb {
    background:rgba(var(--glow),.2); border-radius:3px;
}
::-webkit-scrollbar-thumb:hover { background:rgba(var(--glow),.38); }

/* ===== Responsive – MacBook / Tablet (769px – 1199px) ===== */
@media (min-width:769px) and (max-width:1199px) {
    .navbar         { padding:0 20px; }
    .main-content   { padding:12px 20px 20px; }
    .user-info-bar  { padding:8px 20px; }
    .history-panel  { padding:0 20px; }
    .btn-large      { padding:12px 36px; }
    .panel-container { gap:16px; }
}

/* ===== Responsive – Mobile (≤ 768px) ===== */
@media (max-width:768px) {
    /* Navbar */
    .navbar         { padding:0 14px; height:54px; }
    .nav-links      { display:none; }
    .nav-brand      { font-size:16px; }
    #theme-label    { display:none; }
    .theme-btn      { padding:5px 8px; gap:4px; }
    /* 隐藏导航栏次要按钮 */
    .nav-right > a.nav-btn  { display:none; }
    .nav-right > span       { display:none !important; }

    /* User info bar */
    .user-info-bar  { padding:7px 14px; flex-wrap:wrap; gap:8px; }
    .card-code-label { font-size:11px; max-width:140px;
                       overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
    .logout-btn     { margin-left:0; }

    /* Subtitle */
    .subtitle-section { padding:18px 14px 10px; }
    .feature-badges   { gap:10px; }
    .feature-badge    { font-size:12px; }
    .feature-dot      { display:none; }

    /* Main layout */
    .main-content    { padding:10px 12px 20px; }
    .panel-container { grid-template-columns:1fr; gap:12px; margin-bottom:16px; }

    /* Panel */
    .panel-header {
        flex-wrap:wrap; gap:8px;
        padding:10px 14px;
    }
    .panel-header > div:first-child { flex:1; min-width:0; }
    .panel-header .mode-toggle      { width:100%; justify-content:flex-start; }
    .panel-footer   { padding:8px 14px; }
    .text-area      { min-height:180px; padding:12px 14px; }
    .panel-text-wrap { height:180px; min-height:180px; }

    /* Action buttons */
    .action-buttons     { flex-direction:column; align-items:center; gap:10px; }
    .btn-large          { width:100%; max-width:340px;
                          justify-content:center; padding:13px 24px; }

    /* History */
    .history-panel  { padding:0 12px; }

    /* Toast — 防止超出屏幕 */
    .toast {
        font-size:13px; padding:10px 18px;
        max-width:88vw; white-space:normal; text-align:center;
    }

    /* 背景简化（省性能） */
    .bg-grid        { display:none; }
    .bg-orb         { filter:blur(60px); }
}