:root {
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: #eee;
    --accent: #007aff;
    --accent-hover: #005bb7;
    --text-main: #1d1d1f;
    --text-sub: #1b1b22;
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
    --radius: 24px;
    --card-bg: rgba(255, 255, 255, 0.4);
}

body { margin: 0; overflow: hidden; font-family: 'Inter', sans-serif; background: #f5f5f7; color: var(--text-main); }

/* 引导页样式 */
#landing-page {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 1000; background: radial-gradient(circle at center, #ffffff 0%, #e5e5e7 100%);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    transition: transform 0.8s cubic-bezier(0.86, 0, 0.07, 1), opacity 0.5s ease;
}
#landing-page.hidden { transform: translateY(-100%); opacity: 0; pointer-events: none; }

.landing-content { max-width: 900px; text-align: center; padding: 40px; }
.landing-logo { font-size: 48px; font-weight: 700; margin-bottom: 10px; background: linear-gradient(135deg, #007aff, #00c6ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.landing-subtitle { font-size: 18px; color: var(--text-sub); margin-bottom: 40px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
.feature-card { background: var(--glass-bg); padding: 24px; border-radius: 20px; border: 1px solid var(--glass-border); backdrop-filter: blur(10px); }
.feature-card i { font-size: 24px; color: var(--accent); margin-bottom: 15px; }
.feature-card h3 { margin: 0 0 8px 0; font-size: 16px; }
.feature-card p { margin: 0; font-size: 13px; color: var(--text-sub); line-height: 1.5; }

.upload-zone {
    border: 2px dashed var(--accent); border-radius: 24px; padding: 40px;
    background: rgba(0, 122, 255, 0.05); cursor: pointer; transition: all 0.3s;
    display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.upload-zone:hover { background: rgba(0, 122, 255, 0.1); }
.upload-zone i { font-size: 32px; color: var(--accent); }

.start-actions { display: flex; gap: 15px; margin-top: 30px; justify-content: center; }

#canvas-container { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; outline: none; }

.brand-logo {
    position: absolute;
    left: 24px;
    top: 24px;
    z-index: 100;           
    padding: 12px 24px;      
    width: 150px;     
}

#sidebar {
    position: absolute; right: 24px; top: 24px; bottom: 24px; width: 340px;
    background: var(--glass-bg); backdrop-filter: blur(30px) saturate(200%);
    border: 1px solid var(--glass-border); border-radius: var(--radius);
    box-shadow: var(--shadow); z-index: 100; overflow-y: auto; display: flex; flex-direction: column; padding-bottom: 30px;
}

.sidebar-header {
    padding: 24px; background: rgba(255, 255, 255, 0.2); border-bottom: 1px solid var(--glass-border);
    position: sticky; top: 0; z-index: 10; display: flex; justify-content: space-between; align-items: center;
}
.sidebar-header h2 { margin: 0; font-size: 18px; font-weight: 700; }

.section-card { background: var(--card-bg); border: 1px solid var(--glass-border); border-radius: 16px; padding: 16px; margin: 0 20px 16px 20px; }
.group-title { font-size: 11px; color: var(--text-sub); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; font-weight: 700; }

.prop-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; font-size: 13px; }
.prop-val { font-weight: 600; color: var(--accent); }

.btn {
    display: inline-flex; justify-content: center; align-items: center; width: 100%; padding: 11px; margin-bottom: 8px; 
    background: rgba(255, 255, 255, 0.8); border: 1px solid var(--glass-border); border-radius: 12px; 
    cursor: pointer; font-size: 13px; font-weight: 500; transition: all 0.2s; gap: 8px;
}
.btn:hover { background:#eee;}
.btn-primary:hover { background:var(--accent-hover);}
.btn-primary { background: var(--accent); color: white; border: none; }
.btn-danger { color: #ff3b30; }

.toolbar-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tool-btn { 
    padding: 12px; display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--glass-border); border-radius: 12px; cursor: pointer; background: rgba(255, 255, 255, 0.5);
    font-size: 12px; gap: 6px;
}
.tool-btn.active { background: var(--accent); color: white; }

.texture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 12px; }
.texture-item { aspect-ratio: 1; border-radius: 8px; border: 2px solid transparent; cursor: pointer; overflow: hidden; background: #eee; position: relative; }
.texture-item:hover { border-color: var(--accent); }
.texture-item canvas { width: 100%; height: 100%; display: block; }
.texture-label { position: absolute; bottom: 0; width: 100%; background: rgba(0,0,0,0.5); color: white; font-size: 9px; text-align: center; padding: 2px 0; }

.anim-item { padding: 8px 12px; margin: 4px 0; border-radius: 8px; cursor: pointer; font-size: 12px; }
.anim-item.active { background: white; color: var(--accent); border: 1px solid var(--accent); }

input[type="range"] { width: 100%; height: 4px; margin: 12px 0; -webkit-appearance: none; background: rgba(0,0,0,0.06); outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; background: white; border-radius: 50%; box-shadow: 0 2px 4px rgba(0,0,0,0.1); border: 1px solid #ddd; cursor: pointer; }

#loading {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    background: var(--glass-bg); padding: 20px 40px; border-radius: 20px; display: none; z-index: 200; border: 1px solid var(--glass-border); text-align: center;
}

#toast {
    position: fixed; bottom: 40px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: rgba(0,0,0,0.75); color: white; padding: 12px 24px; border-radius: 50px;
    font-size: 13px; font-weight: 500; opacity: 0; pointer-events: none; transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 2000; backdrop-filter: blur(10px); display: flex; align-items: center; gap: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.shortcut-hint { font-size: 10px; color: var(--text-sub); margin-top: 4px; line-height: 1.4; }