/* AI生图平台 - 前端样式 v1 */
:root {
    --primary: #5740f3;
    --primary-light: #ede9fe;
    --primary-dark: #4338ca;
    --success: #00b894;
    --danger: #ff6b6b;
    --warning: #feca57;
    --bg: #f5f5f7;
    --card: #fff;
    --text: #1f2937;
    --text2: #6b7280;
    --text3: #9ca3af;
    --border: #e5e7eb;
    --radius: 14px;
    --topbar-h: 56px;
    --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh}
a{text-decoration:none;color:inherit}
input,textarea,select,button{font-family:inherit}

/* Topbar */
.topbar{background:#fff;border-bottom:1px solid var(--border);padding:0 20px;height:var(--topbar-h);display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:40}
.topbar-brand{font-size:18px;font-weight:700;color:var(--primary)}
.topbar-right{display:flex;align-items:center;gap:10px}
.credits-badge{padding:6px 14px;background:var(--primary-light);color:var(--primary);border-radius:20px;font-size:13px;font-weight:600;white-space:nowrap}
.btn-redeem{width:32px;height:32px;border-radius:50%;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;transition:.15s}
.btn-redeem:hover{border-color:var(--primary);background:var(--primary-light)}
.user-name{font-size:13px;color:var(--text2)}
.btn-logout,.btn-login,.btn-register{padding:8px 16px;border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;transition:.15s;border:none}
.btn-login{background:var(--primary);color:#fff}.btn-login:hover{opacity:.9}
.btn-register{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-register:hover{border-color:var(--primary);color:var(--primary)}
.btn-logout{background:var(--bg);color:var(--text2);border:1px solid var(--border)}.btn-logout:hover{color:var(--danger);border-color:var(--danger)}

/* Main Container */
.main-container{max-width:900px;margin:0 auto;padding:24px 16px 80px}

/* Hero (未登录) */
.hero-section{text-align:center;padding:80px 20px}
.hero-icon{font-size:72px;margin-bottom:16px}
.hero-section h1{font-size:28px;color:var(--text);margin-bottom:8px}
.hero-section p{color:var(--text2);font-size:16px;margin-bottom:4px}
.hero-sub{font-size:14px!important;color:var(--text3)!important;margin-bottom:32px!important}
.hero-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-buttons button{padding:14px 32px;font-size:15px;font-weight:600;border-radius:12px;cursor:pointer;border:none;transition:.15s}
.hero-buttons .btn-login{background:var(--primary);color:#fff}
.hero-buttons .btn-register{background:#fff;color:var(--primary);border:2px solid var(--primary)}

/* Purpose Tabs */
.purpose-tabs{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;margin-bottom:20px;-webkit-overflow-scrolling:touch}
.purpose-tab{padding:10px 18px;border-radius:20px;font-size:13px;font-weight:500;white-space:nowrap;border:1px solid var(--border);background:#fff;color:var(--text2);cursor:pointer;transition:.15s;flex-shrink:0}
.purpose-tab:hover{border-color:var(--primary);color:var(--primary)}
.purpose-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.purpose-tab .tab-cost{font-size:10px;opacity:.7;margin-left:4px}

/* Gen Panel */
.gen-panel{background:var(--card);border-radius:var(--radius);border:1px solid var(--border);padding:20px;margin-bottom:20px}
.prompt-input{width:100%;padding:14px 16px;border:2px solid var(--border);border-radius:12px;font-size:14px;resize:vertical;min-height:80px;transition:.2s}
.prompt-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.char-count{text-align:right;font-size:11px;color:var(--text3);margin-top:4px}

/* Ref Upload */
.ref-upload{margin-top:12px}
.ref-label{display:inline-block;padding:8px 16px;border:2px dashed var(--border);border-radius:10px;font-size:13px;color:var(--text2);cursor:pointer;transition:.15s}
.ref-label:hover{border-color:var(--primary);color:var(--primary)}
.ref-preview{margin-top:8px;position:relative;display:inline-block}
.ref-preview img{width:100px;height:100px;object-fit:cover;border-radius:8px;border:1px solid var(--border)}
.ref-remove{position:absolute;top:-8px;right:-8px;width:22px;height:22px;border-radius:50%;background:var(--danger);color:#fff;border:none;cursor:pointer;font-size:11px;display:flex;align-items:center;justify-content:center}

/* Options */
.options-row{display:flex;gap:12px;margin-top:16px;flex-wrap:wrap}
.option-group{flex:1;min-width:100px}
.option-group label{display:block;font-size:11px;font-weight:600;color:var(--text3);margin-bottom:4px;text-transform:uppercase}
.option-group select{width:100%;padding:10px 12px;border:2px solid var(--border);border-radius:10px;font-size:13px;background:#fff;transition:.2s}
.option-group select:focus{outline:none;border-color:var(--primary)}

/* Generate Button */
.btn-generate{display:block;width:100%;margin-top:20px;padding:16px;background:var(--primary);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;transition:.15s}
.btn-generate:hover{opacity:.9}
.btn-generate:active{transform:scale(.98)}
.btn-generate:disabled{opacity:.5;cursor:not-allowed}
.gen-status{margin-top:10px;font-size:13px;color:var(--text2);text-align:center;min-height:20px}

/* Result Area */
.result-area{margin-bottom:24px}
.result-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.result-card{background:var(--card);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;transition:.15s}
.result-card:hover{box-shadow:0 4px 16px rgba(0,0,0,.08)}
.result-card img{width:100%;display:block;cursor:pointer}
.result-card .result-info{padding:12px 16px}
.result-card .result-prompt{font-size:13px;color:var(--text);margin-bottom:6px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.result-card .result-meta{font-size:11px;color:var(--text3);display:flex;gap:12px}
.result-card .result-actions{display:flex;gap:8px;padding:0 16px 12px}
.result-card .result-actions button{padding:6px 14px;border-radius:6px;font-size:12px;font-weight:500;border:1px solid var(--border);background:#fff;cursor:pointer;transition:.15s}
.result-card .result-actions button:hover{border-color:var(--primary);color:var(--primary)}

/* History */
.history-section h3{font-size:16px;margin-bottom:12px;color:var(--text)}
.history-list{display:flex;flex-direction:column;gap:8px}
.history-item{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;transition:.15s}
.history-item:hover{border-color:var(--primary-light)}
.history-item .hi-left{flex:1;min-width:0}
.history-item .hi-prompt{font-size:13px;font-weight:500;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.history-item .hi-meta{font-size:11px;color:var(--text3);margin-top:2px}
.history-item .hi-status{padding:3px 10px;border-radius:10px;font-size:11px;font-weight:600;white-space:nowrap}
.hi-status.completed{background:#d1fae5;color:#065f46}
.hi-status.pending,.hi-status.processing{background:#fef3c7;color:#92400e}
.hi-status.failed{background:#fee2e2;color:#991b1b}
.btn-load-more{display:block;width:100%;margin-top:12px;padding:12px;background:var(--bg);border:1px solid var(--border);border-radius:10px;color:var(--text2);cursor:pointer;font-size:13px}

/* Modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:100;display:none;align-items:center;justify-content:center;padding:20px}
.modal.open{display:flex}
.modal-card{background:#fff;border-radius:var(--radius);padding:32px;width:100%;max-width:380px;box-shadow:0 8px 40px rgba(0,0,0,.12)}
.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.modal-header h3{font-size:20px;color:var(--text)}
.modal-close{width:28px;height:28px;border-radius:50%;background:var(--bg);border:none;cursor:pointer;font-size:14px;display:flex;align-items:center;justify-content:center;color:var(--text2)}
.form-group{margin-bottom:14px}
.form-group input{width:100%;padding:12px 16px;border:2px solid var(--border);border-radius:10px;font-size:14px;transition:.2s}
.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}
.btn-primary{display:block;width:100%;padding:14px;background:var(--primary);color:#fff;border:none;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:.15s}
.btn-primary:hover{opacity:.9}
.modal-switch{text-align:center;margin-top:16px;font-size:13px;color:var(--text2)}
.modal-switch a{color:var(--primary);font-weight:600}

/* Toast */
.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%) translateY(-100px);z-index:200;padding:12px 24px;background:#1f2937;color:#fff;border-radius:10px;font-size:14px;font-weight:500;transition:transform .3s;pointer-events:none;max-width:90vw}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast.success{background:#065f46}
.toast.error{background:#991b1b}

/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.9);z-index:150;display:flex;align-items:center;justify-content:center;cursor:pointer}
.lightbox img{max-width:92vw;max-height:92vh;border-radius:8px;object-fit:contain}
.lightbox-close{position:absolute;top:16px;right:24px;color:#fff;font-size:32px;border:none;background:none;cursor:pointer}

/* Loading Spinner */
.spinner{display:inline-block;width:20px;height:20px;border:2px solid #fff;border-top-color:transparent;border-radius:50%;animation:spin .8s linear infinite;vertical-align:middle;margin-right:6px}
@keyframes spin{to{transform:rotate(360deg)}}

/* Empty State */
.empty-state{text-align:center;padding:40px 20px;color:var(--text3)}
.empty-state .icon{font-size:48px;margin-bottom:12px}

/* Desktop */
@media(min-width:769px){
    .main-container{padding:32px 24px 80px}
    .gen-panel{padding:28px}
    .hero-section{padding:120px 20px}
    .hero-section h1{font-size:36px}
    .result-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
}

/* Mobile */
@media(max-width:768px){
    .topbar{padding:0 12px}
    .topbar-brand{font-size:16px}
    .credits-badge{font-size:12px;padding:5px 10px}
    .btn-login,.btn-register{font-size:12px;padding:6px 12px}
    .options-row{gap:8px}
    .option-group select{font-size:12px;padding:8px 10px}
    .btn-generate{padding:14px;font-size:15px}
    .purpose-tab{padding:8px 14px;font-size:12px}
}